| HDF5_OBJ_FULLPATH: | H5_GLOBAL |
| Conventions: | CF-1.6 |
| contributor_name: | Thomas E Neumann (thomas.neumann@nasa.gov), Thorsten Markus (thorsten.markus@nasa.gov), Suneel Bhardwaj (suneel.bhardwaj@nasa.gov) David W Hancock III (david.w.hancock@nasa.gov) |
| contributor_role: | Instrument Engineer, Investigator, Principle Investigator, Data Producer, Data Producer |
| date_type: | UTC |
| description: | The data set (ATL07) contains along-track heights for sea ice and open water leads (at varying length scales) relative to the WGS84 ellipsoid (ITRF2014 reference frame) after adjustment for geoidal and tidal variations, and inverted barometer effects. Heig |
| featureType: | trajectory |
| geospatial_lat_units: | degrees_north |
| geospatial_lon_units: | degrees_east |
| granule_type: | ATL07 |
| identifier_product_doi_authority: | http://dx.doi.org |
| level: | L3A |
| license: | Data may not be reproduced or distributed without including the citation for this product included in this metadata. Data may not be distributed in an altered form without the written permission of the ICESat-2 Science Project Office at NASA/GSFC. |
| naming_authority: | http://dx.doi.org |
| short_name: | ATL07 |
| spatial_coverage_type: | Horizontal |
| standard_name_vocabulary: | CF-1.6 |
| time_type: | CCSDS UTC-A |
| title: | SET_BY_META |
| date_created: | 2020-05-29T14:35:54.000000Z |
| hdfversion: | HDF5 1.10.3 |
| history: | 2020-05-29T14:35:54.000000Z;2bed11f8-37e3-3547-bf60-9d7af1919f0d;Created by PGE atlas_l3a_si Version 4.3.2 |
| identifier_file_uuid: | 2bed11f8-37e3-3547-bf60-9d7af1919f0d |
| identifier_product_format_version: | 4.3 |
| time_coverage_duration: | 5658. |
| time_coverage_end: | 2018-10-14T01:38:05.000000Z |
| time_coverage_start: | 2018-10-14T00:03:47.000000Z |
| geospatial_lat_min: | 68.916474823665695 |
| geospatial_lon_min: | 63.30432580191718 |
| geospatial_lat_max: | 88.043374802950964 |
| geospatial_lon_max: | -136.62047583959989 |
| publisher_name: | NSIDC DAAC > NASA National Snow and Ice Data Center Distributed Active Archive Center |
| publisher_email: | nsidc@nsidc.org |
| publisher_url: | http://nsidc.org/daac/ |
| identifier_product_type: | ATL07 |
| identifier_product_doi: | doi:10.5067/ATLAS/ATL07.003 |
| institution: | National Aeronautics and Space Administration (NASA) |
| creator_name: | GSFC I-SIPS > ICESat-2 Science Investigator-led Processing System |
| summary: | The purpose of ATL07 is to provide along-track sea ice heights and associated statistics. |
| keywords: | EARTH SCIENCE > SPECTRAL/ENGINEERING > LIDAR > LIDAR BACKSCATTER > NONE > NONE > NONE |
| keywords_vocabulary: | NASA/GCMD Science Keywords |
| citation: | Cite these data in publications as follows: The data used in this study were produced by the ICESat-2 Science Project Office at NASA/GSFC. The data archive site is the NASA National Snow and Ice Data Center Distributed Active Archive Center. |
| processing_level: | 2A |
| references: | http://nsidc.org/data/icesat2/data.html |
| project: | ICESat-2 > Ice, Cloud, and land Elevation Satellite-2 |
| instrument: | ATLAS > Advanced Topographic Laser Altimeter System |
| platform: | ICESat-2 > Ice, Cloud, and land Elevation Satellite-2 |
| source: | Spacecraft |
| /orbit_info/crossing_time: | Array of 64 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /orbit_info/crossing_time CLASS: DIMENSION_SCALE NAME: crossing_time contentType: referenceInformation description: The time, in seconds since the ATLAS SDP GPS Epoch, at which the ascending node crosses the equator. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name: Ascending Node Crossing Time source: POD/PPD standard_name: time units: seconds since 2018-01-01 |
| /orbit_info/cycle_number: | Array of 16 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /orbit_info/cycle_number contentType: referenceInformation coordinates: crossing_time description: A count of the number of exact repeats of this reference orbit. long_name: Cycle Number source: Operations units: 1 valid_max: 50 valid_min: 0 |
| /orbit_info/orbit_number: | Array of 16 bit Unsigned integers [ = 0..0] HDF5_OBJ_FULLPATH: /orbit_info/orbit_number contentType: referenceInformation coordinates: crossing_time description: Unique identifying number for each planned ICESat-2 orbit. long_name: Orbit Number source: Operations units: 1 valid_max: 65000 valid_min: 1 |
| /orbit_info/rgt: | Array of 16 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /orbit_info/rgt contentType: referenceInformation coordinates: crossing_time description: The reference ground track (RGT) is the track on the earth at which a specified unit vector within the observatory is pointed. Under nominal operating conditions, there will be no data collected along the RGT, as the RGT is spanned by GT3 and GT4. During slews or off-pointing, it is possible that ground tracks may intersect the RGT. The ICESat-2 mission has 1387 RGTs. long_name: Reference Ground track source: POD/PPD units: 1 valid_max: 1387 valid_min: 1 |
| /orbit_info/sc_orient: | Array of 16 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /orbit_info/sc_orient contentType: referenceInformation coordinates: sc_orient_time description: This parameter tracks the spacecraft orientation between forward, backward and transitional flight modes. ICESat-2 is considered to be flying forward when the weak beams are leading the strong beams; and backward when the strong beams are leading the weak beams. ICESat-2 is considered to be in transition while it is maneuvering between the two orientations. Science quality is potentially degraded while in transition mode. flag_meanings: backward forward transition flag_values: 0, 1, 2 long_name: Spacecraft Orientation source: POD/PPD units: 1 valid_max: 2 valid_min: 0 |
| /orbit_info/sc_orient_time: | Array of 64 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /orbit_info/sc_orient_time CLASS: DIMENSION_SCALE NAME: sc_orient_time contentType: referenceInformation description: The time of the last spacecraft orientation change between forward, backward and transitional flight modes, expressed in seconds since the ATLAS SDP GPS Epoch. ICESat-2 is considered to be flying forward when the weak beams are leading the strong beams; and backward when the strong beams are leading the weak beams. ICESat-2 is considered to be in transition while it is maneuvering between the two orientations. Science quality is potentially degraded while in transition mode. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name: Time of Last Spacecraft Orientation Change source: POD/PPD standard_name: time units: seconds since 2018-01-01 |
| /orbit_info/lan: | Array of 64 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /orbit_info/lan contentType: referenceInformation coordinates: crossing_time description: Longitude at the ascending node crossing. long_name: Ascending Node Longitude source: POD/PPD units: degrees_east valid_max: 180. valid_min: -180. |
| /gt1r/sea_ice_segments/heights/height_segment_fit_quality_flag: | Array of 16 bit Integers [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/heights/height_segment_fit_quality_flag _FillValue: -1 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Flag describing the quality of the results of the along-track fit. (-1=height value is invalid; 1=ngrid_w < wlength/2; 2=ngrid_w >= wlength/2; 3=ngrid_dt < dtlength/2; 4=ngrid_dt >= dtlength/2; 5=ngrid_dt >= (dtlength-2): where 1 is best and 5 is poor). Heights are reported even if this flag indicates the height is invalid. flag_meanings: invalid best high med low poor flag_values: -1, 1, 2, 3, 4, 5 long_name: height Quality Flag source: ATBD, section 4.2.4.2 units: 1 valid_max: 5 valid_min: -1 |
| /gt1r/sea_ice_segments/heights/height_segment_length_seg: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/heights/height_segment_length_seg contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: along-track length of segment containing n_photons_actual long_name: length of segment source: ATBD, section 4.2.2.4 units: meters |
| /gt1r/sea_ice_segments/heights/height_segment_asr_calc: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/heights/height_segment_asr_calc _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Computed apparent surface reflectance for the sea ice segment. long_name: Calculated Apparent Surface Reflectivity source: Sea Ice ATBD units: 1 |
| /gt1r/sea_ice_segments/heights/height_segment_quality: | Array of 16 bit Integers [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/heights/height_segment_quality contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Height segment quality flag, 1 is good quality, 0 is bad depending on fit, wguassian, or layer flag flag_meanings: bad_quality good_quality flag_values: 0, 1 long_name: Height Segment Quality Flag source: ATBD, section 4.2.4 units: 1 valid_max: 1 valid_min: 0 |
| /gt1r/sea_ice_segments/heights/height_segment_n_pulse_seg: | Array of 32 bit Integers [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/heights/height_segment_n_pulse_seg contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: number of laser pulses long_name: number of laser pulses source: ATBD, section 4.2.2.4 units: 1 |
| /gt1r/sea_ice_segments/heights/across_track_distance: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/heights/across_track_distance contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Across track distance of photons averaged over the sea ice height segment. long_name: Across Track Distance source: ATBD, section 4.2.4 units: meters |
| /gt1r/sea_ice_segments/heights/height_segment_htcorr_skew: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/heights/height_segment_htcorr_skew _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: height corection for skew long_name: Height Correction for Skew source: ATBD, section 4.2.6 units: meters |
| /gt1r/sea_ice_segments/heights/height_segment_ssh_flag: | Array of 16 bit Integers [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/heights/height_segment_ssh_flag contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Identifies the height segments that are candidates for use as sea surface reference in freeboard calculations in ATL10. 0 = sea ice; 1 = sea surface flag_meanings: sea_ice sea_surface flag_values: 0, 1 long_name: Sea Surface Flag source: ATBD, section 4.3 units: 1 valid_max: 1 valid_min: 0 |
| /gt1r/sea_ice_segments/heights/height_segment_height: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/heights/height_segment_height coordinates: ../delta_time ../latitude ../longitude description: Mean height from along-track segment fit detremined by the sea ice algorithm long_name: height of segment surface source: ATBD, section 4.2.2.4 units: meters _FillValue: 3.402823466e+38 contentType: referenceInformation |
| /gt1r/sea_ice_segments/heights/height_segment_type: | Array of 16 bit Integers [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/heights/height_segment_type contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Value that indicates segment surface type as sea ice or different types of sea surface. 0=cloud covered: rsurf flag_meanings: cloud_covered other specular_lead_low_w_bkg specular_lead_low specular_lead_high_w_bkg specular_lead_high dark_lead_smooth_w_bkg dark_lead_smooth dark_lead_rough_w_bkg dark_lead_rough flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 long_name: Segment surface type source: ATBD, section 4.3 units: 1 valid_max: 9 valid_min: 0 |
| /gt1r/sea_ice_segments/heights/height_segment_confidence: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/heights/height_segment_confidence _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Confidence level in the surface height estimate based on the number of photons; the background noise rate; and the error analysis long_name: Surface height confidence source: ATBD, section 4.2.4.2 units: 1 |
| /gt1r/sea_ice_segments/heights/height_segment_surface_error_est: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/heights/height_segment_surface_error_est _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Error estimate of the surface height long_name: h surface error est source: ATBD, section 4.2.2.4 units: meters |
| /gt1r/sea_ice_segments/heights/height_segment_w_gaussian: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/heights/height_segment_w_gaussian _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: width of best fit gaussian long_name: width of best fit gaussian source: ATBD, section 4.2.4 units: meters |
| /gt1r/sea_ice_segments/heights/height_segment_rms: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/heights/height_segment_rms _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: RMS difference between sea ice modeled and observed photon height distribution long_name: height rms source: ATBD, section 4.2.2.4 units: meters |
| /gt1r/sea_ice_segments/height_segment_id: | Array of 32 bit Integers [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/height_segment_id contentType: referenceInformation coordinates: delta_time latitude longitude description: Identifier of each height segment long_name: Identifier of each height segment source: ATBD, section 5.2 units: 1 |
| /gt1r/sea_ice_segments/seg_dist_x: | Array of 64 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/seg_dist_x contentType: referenceInformation coordinates: delta_time latitude longitude description: Along-track distance from the equator crossing to the segment center. long_name: Along track distance source: Sea Ice ATBD units: meters |
| /gt1r/sea_ice_segments/longitude: | Array of 64 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/longitude contentType: referenceInformation coordinates: delta_time latitude description: Longitude, WGS84, East=+,Lon of segment center long_name: Longitude source: ATBD, section 4.4 standard_name: longitude units: degrees_east valid_max: 180. valid_min: -180. |
| /gt1r/sea_ice_segments/latitude: | Array of 64 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/latitude contentType: referenceInformation coordinates: delta_time longitude description: Latitude, WGS84, North=+, Lat of segment center long_name: Latitude source: ATBD, section 4.4 standard_name: latitude units: degrees_north valid_max: 90. valid_min: -90. |
| /gt1r/sea_ice_segments/geophysical/height_segment_t2m: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geophysical/height_segment_t2m _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Temperature at 2m above the displacement height (K) long_name: temperature_at_2m source: ATL09 standard_name: temperature units: K |
| /gt1r/sea_ice_segments/geophysical/height_segment_dac: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geophysical/height_segment_dac _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect. long_name: Dynamic Atmosphere Correction source: Sea Ice ATBD units: meters |
| /gt1r/sea_ice_segments/geophysical/height_segment_ps: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geophysical/height_segment_ps _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Sea Level Pressure (Pa) long_name: sea level pressure source: ATL09 standard_name: pressure units: Pa |
| /gt1r/sea_ice_segments/geophysical/height_segment_ib: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geophysical/height_segment_ib _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Inverted barometer effect calculated from surface pressure long_name: Inverted barometer effect source: ATBD, section 4.2 units: meters |
| /gt1r/sea_ice_segments/geophysical/height_segment_load: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geophysical/height_segment_load _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm). long_name: Load Tide source: Sea Ice ATBD units: meters |
| /gt1r/sea_ice_segments/geophysical/height_segment_geoid: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geophysical/height_segment_geoid _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Geoid height above WGS-84 reference ellipsoid (range -107 to 86m), based on the EGM2008 model. long_name: EGM2008 Geoid source: Sea Ice ATBD units: meters |
| /gt1r/sea_ice_segments/geophysical/height_segment_ocean: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geophysical/height_segment_ocean _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium) long_name: Ocean Tide source: Sea Ice ATBD units: meters |
| /gt1r/sea_ice_segments/geophysical/height_segment_v2m: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geophysical/height_segment_v2m _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Northward wind at 2m above the displacement height (m/s-1) long_name: Northward_wind_at_2m source: ATL09 standard_name: northward_wind units: m s-1 |
| /gt1r/sea_ice_segments/geophysical/height_segment_mss: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geophysical/height_segment_mss _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Mean sea surface height above WGS-84 reference ellipsoid (range: -105 to 87m), based on the DTU13 model. long_name: DTU13 Mean Sea Surface source: Sea Ice ATBD units: meters |
| /gt1r/sea_ice_segments/geophysical/height_segment_u2m: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geophysical/height_segment_u2m _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Eastward wind at 2m above the displacement height (m/s-1) long_name: Eastward_wind_at_2m source: ATL09 standard_name: eastward_wind units: m s-1 |
| /gt1r/sea_ice_segments/geophysical/height_segment_lpe: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geophysical/height_segment_lpe _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Long period equilibrium tide self-consistent with ocean tide model (+-0.04m). (dependent only on time and latitude) long_name: Equilibrium Tide source: Sea Ice ATBD units: meters |
| /gt1r/sea_ice_segments/geophysical/height_segment_earth: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geophysical/height_segment_earth _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Solid Earth Tide long_name: Earth Tide source: Sea Ice ATBD units: meters |
| /gt1r/sea_ice_segments/geophysical/height_segment_pole: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geophysical/height_segment_pole coordinates: ../delta_time ../latitude ../longitude description: Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm). long_name: Pole Tide source: Sea Ice ATBD units: meters _FillValue: 3.402823466e+38 contentType: referenceInformation |
| /gt1r/sea_ice_segments/geoseg_beg: | Array of 32 bit Integers [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geoseg_beg contentType: referenceInformation coordinates: delta_time latitude longitude description: Geolocation segment (geoseg) ID associated with the first photon used in this sea ice segment long_name: Beginning GEOSEG source: Sea Ice ATBD units: 1 |
| /gt1r/sea_ice_segments/delta_time: | Array of 64 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/delta_time contentType: physicalMeasurement coordinates: latitude longitude description: Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name: Elapsed GPS seconds source: telemetry standard_name: time units: seconds since 2018-01-01 CLASS: DIMENSION_SCALE NAME: gt1r/sea_ice_segments/delta_time |
| /gt1r/sea_ice_segments/stats/msw_flag: | Array of 16 bit Integers [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/msw_flag contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Multiple Scattering warning flag. The multiple scattering warning flag (ATL09 parameter msw_flag) has values from -1 to 5 where zero means no multiple scattering and 5 the greatest. If no layers were detected, then msw_flag = 0. If blowing snow is detected and its estimated optical depth is greater than or equal to 0.5, then msw_flag = 5. If the blowing snow optical depth is less than 0.5, then msw_flag = 4. If no blowing snow is detected but there are cloud or aerosol layers detected, the msw_flag assumes values of 1 to 3 based on the height of the bottom of the lowest layer: < 1 km, msw_flag = 3; 1-3 km, msw_flag = 2; > 3km, msw_flag = 1. A value of -1 indicates that the signal to noise of the data was too low to reliably ascertain the presence of cloud or blowing snow. We expect values of -1 to occur only during daylight. flag_meanings: cannot_determine no_layers layer_gt_3km layer_between_1_and_3_km layer_lt_1km blow_snow_od_lt_0.5 blow_snow_od_gt_0.5 flag_values: -1, 0, 1, 2, 3, 4, 5 long_name: Multiple Scattering Warning Flag source: Atmosphere ATBD units: 1 valid_max: 5 valid_min: -1 |
| /gt1r/sea_ice_segments/stats/hist_median_h: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/hist_median_h _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Median of the n_fit_photons heights long_name: trimmed photon heights median source: ATBD, section 4.2.3.1 units: meters |
| /gt1r/sea_ice_segments/stats/height_filter_min: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/height_filter_min _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: height minimum used in the ssh height filter long_name: Height Filter Min source: sea ice ATBD , sect 4.2.1.2 units: meters |
| /gt1r/sea_ice_segments/stats/cloud_flag_atm: | Array of 16 bit Integers [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/cloud_flag_atm contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Number of layers found from the backscatter profile using the DDA layer finder. long_name: Cloud Flag Atm source: Atmosphere ATBD units: 1 valid_max: 10 valid_min: 0 |
| /gt1r/sea_ice_segments/stats/fpb_avg_dt: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/fpb_avg_dt _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: FPB correction average dead time long_name: fpb correction average deadtime source: Sea Ice ATBD units: ns |
| /gt1r/sea_ice_segments/stats/ds_si_hist_bins: | Array of 32 bit Integers [ = 0..220] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/ds_si_hist_bins CLASS: DIMENSION_SCALE NAME: ds_si_hist_bins contentType: auxiliaryInformation description: Dimension scale indexing the sea ice histogram bins. The bin heights must be computed from information contained within the same group as the histogram. long_name: Sea Ice Histogram Bins Dimension Scale source: SeaIce ATBD units: 1 |
| /gt1r/sea_ice_segments/stats/fpb_strength: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/fpb_strength _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: FPB correction strength long_name: fpb correction strength source: Sea Ice ATBD units: photons/shot |
| /gt1r/sea_ice_segments/stats/bsnow_con: | Array of 16 bit Integers [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/bsnow_con _FillValue: 127 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Blowing snow confidence long_name: Blowing snow confidence source: ATL09 units: 1 |
| /gt1r/sea_ice_segments/stats/layer_flag: | Array of 16 bit Integers [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/layer_flag contentType: qualityInformation coordinates: ../delta_time ../latitude ../longitude description: This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow. flag_meanings: likely_clear likely_cloudy flag_values: 0, 1 long_name: Consolidated cloud flag source: Atmosphere ATBD units: 1 valid_max: 1 valid_min: 0 |
| /gt1r/sea_ice_segments/stats/hist_photon_bin_size: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/hist_photon_bin_size contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: bin size of photon height histogram long_name: height histogram bin size source: ATBD, section 4.2.2.4 units: meters |
| /gt1r/sea_ice_segments/stats/backgr_calc: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/backgr_calc _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Calculated background count rate based on sun angle, surface slope, unit reflectance long_name: background count rate calculated source: ATBD, section 4.2.3 units: hz |
| /gt1r/sea_ice_segments/stats/fpb_corr: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/fpb_corr _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Estimated first-photon bias(fpb) correction to mean segment height long_name: first photon bias correction source: Sea Ice ATBD units: meters |
| /gt1r/sea_ice_segments/stats/bsnow_h: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/bsnow_h _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Blowing snow layer top height long_name: Blowing snow top h source: ATL09 units: meters |
| /gt1r/sea_ice_segments/stats/hist_photon_bottom: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/hist_photon_bottom contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: lower bound of height histogram long_name: height histogram minimum source: ATBD, section 4.2.2.4 units: meters |
| /gt1r/sea_ice_segments/stats/background_r_norm: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/background_r_norm _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Background rate normalized to a fixed solar elevation angle long_name: Normalized background (50-shot) source: ATBD section 4.3.1.3 units: hz |
| /gt1r/sea_ice_segments/stats/exmax_mean_2: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/exmax_mean_2 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height mean 2 long_name: Exmax Mean 2 source: sea ice ATBD Appendix E units: meters |
| /gt1r/sea_ice_segments/stats/background_int_height: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/background_int_height _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: The height of the altimetric range window after subtracting the height span of the signal photon events in the 50-shot span long_name: Height of column used in background calculation source: ATBD, section 7.3 units: meters |
| /gt1r/sea_ice_segments/stats/n_photons_actual: | Array of 16 bit Integers [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/n_photons_actual _FillValue: -1 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Number of photons gathered long_name: Number of photons found for the segment source: ATBD, section 4.2.2.4 units: 1 |
| /gt1r/sea_ice_segments/stats/ice_conc: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/ice_conc contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: sea ice concentration long_name: sea ice concentration source: ATBD, section 3.1.4 units: 1 |
| /gt1r/sea_ice_segments/stats/exmax_stdev_2: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/exmax_stdev_2 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height standard deviation 2 long_name: Exmax Stdev 2 source: sea ice ATBD Appendix E units: meters |
| /gt1r/sea_ice_segments/stats/cloud_flag_asr: | Array of 16 bit Integers [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/cloud_flag_asr contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Cloud flag (probability) from apparent surface reflectance. 0=clear with high confidence; 1=clear with medium confidence; 2=clear with low confidence; 3=cloudy with low confidence; 4=cloudy with medium confidence; 5=cloudy with high confidence; 6=unknown flag_meanings: clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence unknown flag_values: 0, 1, 2, 3, 4, 5, 6 long_name: Cloud Flag ASR source: Atmosphere ATBD units: 1 valid_max: 6 valid_min: 0 |
| /gt1r/sea_ice_segments/stats/exmax_stdev_1: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/exmax_stdev_1 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height standard deviation 1 long_name: Exmax Stdev 1 source: sea ice ATBD Appendix E units: meters |
| /gt1r/sea_ice_segments/stats/fpb_corr_width: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/fpb_corr_width _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: FPB correction width long_name: fpb correction width source: Sea Ice ATBD units: ns |
| /gt1r/sea_ice_segments/stats/height_coarse_stdev: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/height_coarse_stdev contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: height standard deviation of coarse tracker long_name: Coarse Height Sdev source: sea ice ATBD , sect 4.2.1.2 units: meters |
| /gt1r/sea_ice_segments/stats/height_filter_05: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/height_filter_05 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: height fifth percentile used in the ssh height filter long_name: Height Filter 5th Percentile source: sea ice ATBD , sect 4.2.1.2 units: meters |
| /gt1r/sea_ice_segments/stats/n_photons_used: | Array of 16 bit Integers [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/n_photons_used _FillValue: -1 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Number of photons in the trimmed histogram. long_name: Number of photons used for fit source: ATBD, section 4.2.2.4 units: 1 |
| /gt1r/sea_ice_segments/stats/backgr_r_200: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/backgr_r_200 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Background count rate, averaged over the segment based on ATLAS 50 pulse counts long_name: Background rate 200 hz source: ATL09 units: hz |
| /gt1r/sea_ice_segments/stats/hist_photon_top: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/hist_photon_top contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: upper bound of height histogram long_name: height histogram maximum source: ATBD, section 4.2.2.4 units: meters |
| /gt1r/sea_ice_segments/stats/hist_w: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/hist_w _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Segment histogram width estimate long_name: Segment histogram width estimate source: ATBD, section 4.2.2.4 units: meters |
| /gt1r/sea_ice_segments/stats/hist_mean_h: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/hist_mean_h _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Mean of the n_fit_photons heights long_name: photon heights mean source: ATBD, section 4.2.2.4 units: meters |
| /gt1r/sea_ice_segments/stats/height_coarse_mn: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/height_coarse_mn contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: height mean of coarse tracker long_name: Coarse Track Height Mean source: sea ice ATBD , sect 4.2.1.2 units: meters |
| /gt1r/sea_ice_segments/stats/exmax_mean_1: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/exmax_mean_1 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height mean 1 long_name: Exmax Mean 1 source: sea ice ATBD Appendix E units: meters |
| /gt1r/sea_ice_segments/stats/hist_photon_heights: | Array of 16 bit Integers [ = 0..280132][ = 0..220] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/hist_photon_heights contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Histogram of the n_fit_photons heights long_name: photon heights histogram source: ATBD, section 4.2.2.4 units: 1 |
| /gt1r/sea_ice_segments/stats/trim_height_top: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/trim_height_top _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: maximum height of trimmed photons used in the surface calculation procedure long_name: maximum height of trimmed photons source: ATBD, section 4.2.2.4 units: meters |
| /gt1r/sea_ice_segments/stats/exmax_mix: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/exmax_mix _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height mix ratio long_name: Exmax Mix source: sea ice ATBD Appendix E units: meters |
| /gt1r/sea_ice_segments/stats/asr_25: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/asr_25 _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Apparent surface reflectance at 25 hz, averaged to the sea ice segment. long_name: Apparent Surface Reflectance 25hz source: Sea Ice ATBD units: 1 |
| /gt1r/sea_ice_segments/stats/photon_rate: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/photon_rate _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: photon count rate, averaged over segment long_name: photon rate source: ATBD, section 4.2.2.4 units: photons/shot |
| /gt1r/sea_ice_segments/stats/trim_height_bottom: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/trim_height_bottom _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: minimum height of trimmed photons used in the surface calculation procedure long_name: minimum height of trimmed photons source: ATBD, section 4.2.2.4 units: meters |
| /gt1r/sea_ice_segments/stats/n_photons_define: | Array of 16 bit Integers [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/n_photons_define _FillValue: -1 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Number of photons to gather. long_name: Number of photons defining the segment source: ATBD, section 4.2.2.4 units: 1 |
| /gt1r/sea_ice_segments/stats/backgr_r_25: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/stats/backgr_r_25 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Background count rate, averaged over the segment based on 25 hz atmosphere long_name: Background rate 25hz source: ATL09 units: hz |
| /gt1r/sea_ice_segments/geoseg_end: | Array of 32 bit Integers [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geoseg_end contentType: referenceInformation coordinates: delta_time latitude longitude description: Geolocation segment (geoseg) ID associated with the last photon used in this sea ice segment long_name: Ending GEOSEG source: Sea Ice ATBD units: 1 |
| /gt1r/sea_ice_segments/geolocation/rgt: | Array of 16 bit Integers [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geolocation/rgt contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: The reference ground track (RGT) is the track on the earth at which a specified unit vector within the observatory is pointed. Under nominal operating conditions, there will be no data collected along the RGT, as the RGT is spanned by GT3 and GT4. During slews or off-pointing, it is possible that ground tracks may intersect the RGT. The ICESat-2 mission has 1387 RGTs. long_name: Reference Ground track source: Sea Ice ATBD units: 1 valid_max: 1387 valid_min: 1 |
| /gt1r/sea_ice_segments/geolocation/sigma_lon: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geolocation/sigma_lon _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Estimated uncertainty for the reference photon bounce point east longitude: 1- sigma (degrees). Applies to all other photons in the group. long_name: longitude uncertainty source: Sea Ice ATBD units: degrees |
| /gt1r/sea_ice_segments/geolocation/ref_atm_delay: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geolocation/ref_atm_delay _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Atmospheric path delay, in range, for the reference photon. long_name: Reference Photon Atm. Path Delay source: Sea Ice ATBD units: meters |
| /gt1r/sea_ice_segments/geolocation/beam_azimuth: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geolocation/beam_azimuth _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft). When the spacecraft is precisely at the geodetic zenith, the value will be 99999 degrees. long_name: beam azimuth source: Sea Ice ATBD units: degrees_east |
| /gt1r/sea_ice_segments/geolocation/solar_azimuth: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geolocation/solar_azimuth contentType: physicalMeansurement coordinates: ../delta_time ../latitude ../longitude description: The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot. long_name: solar azimuth source: Sea Ice ATBD units: degrees_east |
| /gt1r/sea_ice_segments/geolocation/ref_atm_delay_derivative: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geolocation/ref_atm_delay_derivative _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Atmospheric path delay derivative with respect to ellipsoid for the reference photon, in meters per meter. long_name: Derivative of Atm. Path Delay source: Sea Ice ATBD units: meters/meter |
| /gt1r/sea_ice_segments/geolocation/sigma_lat: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geolocation/sigma_lat _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Estimated uncertainty for the reference photon bounce point geodetic latitude: 1- sigma (degrees). Applies to all other photons in the group long_name: latitude uncertainty source: Sea Ice ATBD units: 1 |
| /gt1r/sea_ice_segments/geolocation/beam_coelev: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geolocation/beam_coelev _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Co-elevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot. long_name: beam co-elevation source: Sea Ice ATBD units: degrees |
| /gt1r/sea_ice_segments/geolocation/sigma_h: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geolocation/sigma_h _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Estimated uncertainty for the reference photon bounce point ellipsoid height: 1- sigma (m). Error estimates for all other photons in the group are computed with the scale defined below. long_name: height uncertainty source: Sea Ice ATBD units: 1 |
| /gt1r/sea_ice_segments/geolocation/solar_elevation: | Array of 32 bit Reals [ = 0..280132] HDF5_OBJ_FULLPATH: /gt1r/sea_ice_segments/geolocation/solar_elevation contentType: physicalMeansurement coordinates: ../delta_time ../latitude ../longitude description: Solar Angle above or below the plane tangent to the ellipsoid surface at the laser spot. Positive values mean the sun is above the horizon, while negative values mean it is below the horizon. The effect of atmospheric refraction is not included. This is a low precision value, with approximately TBD degree accuracy. long_name: solar elevation source: Sea Ice ATBD units: degrees |
| /gt2r/sea_ice_segments/heights/height_segment_fit_quality_flag: | Array of 16 bit Integers [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/heights/height_segment_fit_quality_flag _FillValue: -1 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Flag describing the quality of the results of the along-track fit. (-1=height value is invalid; 1=ngrid_w < wlength/2; 2=ngrid_w >= wlength/2; 3=ngrid_dt < dtlength/2; 4=ngrid_dt >= dtlength/2; 5=ngrid_dt >= (dtlength-2): where 1 is best and 5 is poor). Heights are reported even if this flag indicates the height is invalid. flag_meanings: invalid best high med low poor flag_values: -1, 1, 2, 3, 4, 5 long_name: height Quality Flag source: ATBD, section 4.2.4.2 units: 1 valid_max: 5 valid_min: -1 |
| /gt2r/sea_ice_segments/heights/height_segment_length_seg: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/heights/height_segment_length_seg contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: along-track length of segment containing n_photons_actual long_name: length of segment source: ATBD, section 4.2.2.4 units: meters |
| /gt2r/sea_ice_segments/heights/height_segment_asr_calc: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/heights/height_segment_asr_calc _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Computed apparent surface reflectance for the sea ice segment. long_name: Calculated Apparent Surface Reflectivity source: Sea Ice ATBD units: 1 |
| /gt2r/sea_ice_segments/heights/height_segment_quality: | Array of 16 bit Integers [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/heights/height_segment_quality contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Height segment quality flag, 1 is good quality, 0 is bad depending on fit, wguassian, or layer flag flag_meanings: bad_quality good_quality flag_values: 0, 1 long_name: Height Segment Quality Flag source: ATBD, section 4.2.4 units: 1 valid_max: 1 valid_min: 0 |
| /gt2r/sea_ice_segments/heights/height_segment_n_pulse_seg: | Array of 32 bit Integers [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/heights/height_segment_n_pulse_seg contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: number of laser pulses long_name: number of laser pulses source: ATBD, section 4.2.2.4 units: 1 |
| /gt2r/sea_ice_segments/heights/across_track_distance: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/heights/across_track_distance contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Across track distance of photons averaged over the sea ice height segment. long_name: Across Track Distance source: ATBD, section 4.2.4 units: meters |
| /gt2r/sea_ice_segments/heights/height_segment_htcorr_skew: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/heights/height_segment_htcorr_skew _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: height corection for skew long_name: Height Correction for Skew source: ATBD, section 4.2.6 units: meters |
| /gt2r/sea_ice_segments/heights/height_segment_ssh_flag: | Array of 16 bit Integers [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/heights/height_segment_ssh_flag contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Identifies the height segments that are candidates for use as sea surface reference in freeboard calculations in ATL10. 0 = sea ice; 1 = sea surface flag_meanings: sea_ice sea_surface flag_values: 0, 1 long_name: Sea Surface Flag source: ATBD, section 4.3 units: 1 valid_max: 1 valid_min: 0 |
| /gt2r/sea_ice_segments/heights/height_segment_height: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/heights/height_segment_height coordinates: ../delta_time ../latitude ../longitude description: Mean height from along-track segment fit detremined by the sea ice algorithm long_name: height of segment surface source: ATBD, section 4.2.2.4 units: meters _FillValue: 3.402823466e+38 contentType: referenceInformation |
| /gt2r/sea_ice_segments/heights/height_segment_type: | Array of 16 bit Integers [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/heights/height_segment_type contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Value that indicates segment surface type as sea ice or different types of sea surface. 0=cloud covered: rsurf flag_meanings: cloud_covered other specular_lead_low_w_bkg specular_lead_low specular_lead_high_w_bkg specular_lead_high dark_lead_smooth_w_bkg dark_lead_smooth dark_lead_rough_w_bkg dark_lead_rough flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 long_name: Segment surface type source: ATBD, section 4.3 units: 1 valid_max: 9 valid_min: 0 |
| /gt2r/sea_ice_segments/heights/height_segment_confidence: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/heights/height_segment_confidence _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Confidence level in the surface height estimate based on the number of photons; the background noise rate; and the error analysis long_name: Surface height confidence source: ATBD, section 4.2.4.2 units: 1 |
| /gt2r/sea_ice_segments/heights/height_segment_surface_error_est: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/heights/height_segment_surface_error_est _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Error estimate of the surface height long_name: h surface error est source: ATBD, section 4.2.2.4 units: meters |
| /gt2r/sea_ice_segments/heights/height_segment_w_gaussian: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/heights/height_segment_w_gaussian _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: width of best fit gaussian long_name: width of best fit gaussian source: ATBD, section 4.2.4 units: meters |
| /gt2r/sea_ice_segments/heights/height_segment_rms: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/heights/height_segment_rms _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: RMS difference between sea ice modeled and observed photon height distribution long_name: height rms source: ATBD, section 4.2.2.4 units: meters |
| /gt2r/sea_ice_segments/height_segment_id: | Array of 32 bit Integers [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/height_segment_id contentType: referenceInformation coordinates: delta_time latitude longitude description: Identifier of each height segment long_name: Identifier of each height segment source: ATBD, section 5.2 units: 1 |
| /gt2r/sea_ice_segments/seg_dist_x: | Array of 64 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/seg_dist_x contentType: referenceInformation coordinates: delta_time latitude longitude description: Along-track distance from the equator crossing to the segment center. long_name: Along track distance source: Sea Ice ATBD units: meters |
| /gt2r/sea_ice_segments/longitude: | Array of 64 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/longitude contentType: referenceInformation coordinates: delta_time latitude description: Longitude, WGS84, East=+,Lon of segment center long_name: Longitude source: ATBD, section 4.4 standard_name: longitude units: degrees_east valid_max: 180. valid_min: -180. |
| /gt2r/sea_ice_segments/latitude: | Array of 64 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/latitude contentType: referenceInformation coordinates: delta_time longitude description: Latitude, WGS84, North=+, Lat of segment center long_name: Latitude source: ATBD, section 4.4 standard_name: latitude units: degrees_north valid_max: 90. valid_min: -90. |
| /gt2r/sea_ice_segments/geophysical/height_segment_t2m: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geophysical/height_segment_t2m _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Temperature at 2m above the displacement height (K) long_name: temperature_at_2m source: ATL09 standard_name: temperature units: K |
| /gt2r/sea_ice_segments/geophysical/height_segment_dac: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geophysical/height_segment_dac _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect. long_name: Dynamic Atmosphere Correction source: Sea Ice ATBD units: meters |
| /gt2r/sea_ice_segments/geophysical/height_segment_ps: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geophysical/height_segment_ps _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Sea Level Pressure (Pa) long_name: sea level pressure source: ATL09 standard_name: pressure units: Pa |
| /gt2r/sea_ice_segments/geophysical/height_segment_ib: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geophysical/height_segment_ib _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Inverted barometer effect calculated from surface pressure long_name: Inverted barometer effect source: ATBD, section 4.2 units: meters |
| /gt2r/sea_ice_segments/geophysical/height_segment_load: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geophysical/height_segment_load _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm). long_name: Load Tide source: Sea Ice ATBD units: meters |
| /gt2r/sea_ice_segments/geophysical/height_segment_geoid: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geophysical/height_segment_geoid _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Geoid height above WGS-84 reference ellipsoid (range -107 to 86m), based on the EGM2008 model. long_name: EGM2008 Geoid source: Sea Ice ATBD units: meters |
| /gt2r/sea_ice_segments/geophysical/height_segment_ocean: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geophysical/height_segment_ocean _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium) long_name: Ocean Tide source: Sea Ice ATBD units: meters |
| /gt2r/sea_ice_segments/geophysical/height_segment_v2m: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geophysical/height_segment_v2m _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Northward wind at 2m above the displacement height (m/s-1) long_name: Northward_wind_at_2m source: ATL09 standard_name: northward_wind units: m s-1 |
| /gt2r/sea_ice_segments/geophysical/height_segment_mss: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geophysical/height_segment_mss _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Mean sea surface height above WGS-84 reference ellipsoid (range: -105 to 87m), based on the DTU13 model. long_name: DTU13 Mean Sea Surface source: Sea Ice ATBD units: meters |
| /gt2r/sea_ice_segments/geophysical/height_segment_u2m: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geophysical/height_segment_u2m _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Eastward wind at 2m above the displacement height (m/s-1) long_name: Eastward_wind_at_2m source: ATL09 standard_name: eastward_wind units: m s-1 |
| /gt2r/sea_ice_segments/geophysical/height_segment_lpe: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geophysical/height_segment_lpe _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Long period equilibrium tide self-consistent with ocean tide model (+-0.04m). (dependent only on time and latitude) long_name: Equilibrium Tide source: Sea Ice ATBD units: meters |
| /gt2r/sea_ice_segments/geophysical/height_segment_earth: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geophysical/height_segment_earth _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Solid Earth Tide long_name: Earth Tide source: Sea Ice ATBD units: meters |
| /gt2r/sea_ice_segments/geophysical/height_segment_pole: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geophysical/height_segment_pole coordinates: ../delta_time ../latitude ../longitude description: Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm). long_name: Pole Tide source: Sea Ice ATBD units: meters _FillValue: 3.402823466e+38 contentType: referenceInformation |
| /gt2r/sea_ice_segments/geoseg_beg: | Array of 32 bit Integers [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geoseg_beg contentType: referenceInformation coordinates: delta_time latitude longitude description: Geolocation segment (geoseg) ID associated with the first photon used in this sea ice segment long_name: Beginning GEOSEG source: Sea Ice ATBD units: 1 |
| /gt2r/sea_ice_segments/delta_time: | Array of 64 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/delta_time contentType: physicalMeasurement coordinates: latitude longitude description: Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name: Elapsed GPS seconds source: telemetry standard_name: time units: seconds since 2018-01-01 CLASS: DIMENSION_SCALE NAME: gt2r/sea_ice_segments/delta_time |
| /gt2r/sea_ice_segments/stats/msw_flag: | Array of 16 bit Integers [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/msw_flag contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Multiple Scattering warning flag. The multiple scattering warning flag (ATL09 parameter msw_flag) has values from -1 to 5 where zero means no multiple scattering and 5 the greatest. If no layers were detected, then msw_flag = 0. If blowing snow is detected and its estimated optical depth is greater than or equal to 0.5, then msw_flag = 5. If the blowing snow optical depth is less than 0.5, then msw_flag = 4. If no blowing snow is detected but there are cloud or aerosol layers detected, the msw_flag assumes values of 1 to 3 based on the height of the bottom of the lowest layer: < 1 km, msw_flag = 3; 1-3 km, msw_flag = 2; > 3km, msw_flag = 1. A value of -1 indicates that the signal to noise of the data was too low to reliably ascertain the presence of cloud or blowing snow. We expect values of -1 to occur only during daylight. flag_meanings: cannot_determine no_layers layer_gt_3km layer_between_1_and_3_km layer_lt_1km blow_snow_od_lt_0.5 blow_snow_od_gt_0.5 flag_values: -1, 0, 1, 2, 3, 4, 5 long_name: Multiple Scattering Warning Flag source: Atmosphere ATBD units: 1 valid_max: 5 valid_min: -1 |
| /gt2r/sea_ice_segments/stats/hist_median_h: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/hist_median_h _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Median of the n_fit_photons heights long_name: trimmed photon heights median source: ATBD, section 4.2.3.1 units: meters |
| /gt2r/sea_ice_segments/stats/height_filter_min: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/height_filter_min _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: height minimum used in the ssh height filter long_name: Height Filter Min source: sea ice ATBD , sect 4.2.1.2 units: meters |
| /gt2r/sea_ice_segments/stats/cloud_flag_atm: | Array of 16 bit Integers [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/cloud_flag_atm contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Number of layers found from the backscatter profile using the DDA layer finder. long_name: Cloud Flag Atm source: Atmosphere ATBD units: 1 valid_max: 10 valid_min: 0 |
| /gt2r/sea_ice_segments/stats/fpb_avg_dt: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/fpb_avg_dt _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: FPB correction average dead time long_name: fpb correction average deadtime source: Sea Ice ATBD units: ns |
| /gt2r/sea_ice_segments/stats/ds_si_hist_bins: | Array of 32 bit Integers [ = 0..220] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/ds_si_hist_bins CLASS: DIMENSION_SCALE NAME: ds_si_hist_bins contentType: auxiliaryInformation description: Dimension scale indexing the sea ice histogram bins. The bin heights must be computed from information contained within the same group as the histogram. long_name: Sea Ice Histogram Bins Dimension Scale source: SeaIce ATBD units: 1 |
| /gt2r/sea_ice_segments/stats/fpb_strength: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/fpb_strength _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: FPB correction strength long_name: fpb correction strength source: Sea Ice ATBD units: photons/shot |
| /gt2r/sea_ice_segments/stats/bsnow_con: | Array of 16 bit Integers [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/bsnow_con _FillValue: 127 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Blowing snow confidence long_name: Blowing snow confidence source: ATL09 units: 1 |
| /gt2r/sea_ice_segments/stats/layer_flag: | Array of 16 bit Integers [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/layer_flag contentType: qualityInformation coordinates: ../delta_time ../latitude ../longitude description: This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow. flag_meanings: likely_clear likely_cloudy flag_values: 0, 1 long_name: Consolidated cloud flag source: Atmosphere ATBD units: 1 valid_max: 1 valid_min: 0 |
| /gt2r/sea_ice_segments/stats/hist_photon_bin_size: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/hist_photon_bin_size contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: bin size of photon height histogram long_name: height histogram bin size source: ATBD, section 4.2.2.4 units: meters |
| /gt2r/sea_ice_segments/stats/backgr_calc: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/backgr_calc _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Calculated background count rate based on sun angle, surface slope, unit reflectance long_name: background count rate calculated source: ATBD, section 4.2.3 units: hz |
| /gt2r/sea_ice_segments/stats/fpb_corr: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/fpb_corr _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Estimated first-photon bias(fpb) correction to mean segment height long_name: first photon bias correction source: Sea Ice ATBD units: meters |
| /gt2r/sea_ice_segments/stats/bsnow_h: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/bsnow_h _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Blowing snow layer top height long_name: Blowing snow top h source: ATL09 units: meters |
| /gt2r/sea_ice_segments/stats/hist_photon_bottom: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/hist_photon_bottom contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: lower bound of height histogram long_name: height histogram minimum source: ATBD, section 4.2.2.4 units: meters |
| /gt2r/sea_ice_segments/stats/background_r_norm: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/background_r_norm _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Background rate normalized to a fixed solar elevation angle long_name: Normalized background (50-shot) source: ATBD section 4.3.1.3 units: hz |
| /gt2r/sea_ice_segments/stats/exmax_mean_2: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/exmax_mean_2 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height mean 2 long_name: Exmax Mean 2 source: sea ice ATBD Appendix E units: meters |
| /gt2r/sea_ice_segments/stats/background_int_height: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/background_int_height _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: The height of the altimetric range window after subtracting the height span of the signal photon events in the 50-shot span long_name: Height of column used in background calculation source: ATBD, section 7.3 units: meters |
| /gt2r/sea_ice_segments/stats/n_photons_actual: | Array of 16 bit Integers [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/n_photons_actual _FillValue: -1 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Number of photons gathered long_name: Number of photons found for the segment source: ATBD, section 4.2.2.4 units: 1 |
| /gt2r/sea_ice_segments/stats/ice_conc: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/ice_conc contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: sea ice concentration long_name: sea ice concentration source: ATBD, section 3.1.4 units: 1 |
| /gt2r/sea_ice_segments/stats/exmax_stdev_2: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/exmax_stdev_2 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height standard deviation 2 long_name: Exmax Stdev 2 source: sea ice ATBD Appendix E units: meters |
| /gt2r/sea_ice_segments/stats/cloud_flag_asr: | Array of 16 bit Integers [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/cloud_flag_asr contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Cloud flag (probability) from apparent surface reflectance. 0=clear with high confidence; 1=clear with medium confidence; 2=clear with low confidence; 3=cloudy with low confidence; 4=cloudy with medium confidence; 5=cloudy with high confidence; 6=unknown flag_meanings: clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence unknown flag_values: 0, 1, 2, 3, 4, 5, 6 long_name: Cloud Flag ASR source: Atmosphere ATBD units: 1 valid_max: 6 valid_min: 0 |
| /gt2r/sea_ice_segments/stats/exmax_stdev_1: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/exmax_stdev_1 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height standard deviation 1 long_name: Exmax Stdev 1 source: sea ice ATBD Appendix E units: meters |
| /gt2r/sea_ice_segments/stats/fpb_corr_width: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/fpb_corr_width _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: FPB correction width long_name: fpb correction width source: Sea Ice ATBD units: ns |
| /gt2r/sea_ice_segments/stats/height_coarse_stdev: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/height_coarse_stdev contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: height standard deviation of coarse tracker long_name: Coarse Height Sdev source: sea ice ATBD , sect 4.2.1.2 units: meters |
| /gt2r/sea_ice_segments/stats/height_filter_05: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/height_filter_05 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: height fifth percentile used in the ssh height filter long_name: Height Filter 5th Percentile source: sea ice ATBD , sect 4.2.1.2 units: meters |
| /gt2r/sea_ice_segments/stats/n_photons_used: | Array of 16 bit Integers [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/n_photons_used _FillValue: -1 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Number of photons in the trimmed histogram. long_name: Number of photons used for fit source: ATBD, section 4.2.2.4 units: 1 |
| /gt2r/sea_ice_segments/stats/backgr_r_200: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/backgr_r_200 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Background count rate, averaged over the segment based on ATLAS 50 pulse counts long_name: Background rate 200 hz source: ATL09 units: hz |
| /gt2r/sea_ice_segments/stats/hist_photon_top: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/hist_photon_top contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: upper bound of height histogram long_name: height histogram maximum source: ATBD, section 4.2.2.4 units: meters |
| /gt2r/sea_ice_segments/stats/hist_w: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/hist_w _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Segment histogram width estimate long_name: Segment histogram width estimate source: ATBD, section 4.2.2.4 units: meters |
| /gt2r/sea_ice_segments/stats/hist_mean_h: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/hist_mean_h _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Mean of the n_fit_photons heights long_name: photon heights mean source: ATBD, section 4.2.2.4 units: meters |
| /gt2r/sea_ice_segments/stats/height_coarse_mn: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/height_coarse_mn contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: height mean of coarse tracker long_name: Coarse Track Height Mean source: sea ice ATBD , sect 4.2.1.2 units: meters |
| /gt2r/sea_ice_segments/stats/exmax_mean_1: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/exmax_mean_1 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height mean 1 long_name: Exmax Mean 1 source: sea ice ATBD Appendix E units: meters |
| /gt2r/sea_ice_segments/stats/hist_photon_heights: | Array of 16 bit Integers [ = 0..225002][ = 0..220] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/hist_photon_heights contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Histogram of the n_fit_photons heights long_name: photon heights histogram source: ATBD, section 4.2.2.4 units: 1 |
| /gt2r/sea_ice_segments/stats/trim_height_top: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/trim_height_top _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: maximum height of trimmed photons used in the surface calculation procedure long_name: maximum height of trimmed photons source: ATBD, section 4.2.2.4 units: meters |
| /gt2r/sea_ice_segments/stats/exmax_mix: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/exmax_mix _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height mix ratio long_name: Exmax Mix source: sea ice ATBD Appendix E units: meters |
| /gt2r/sea_ice_segments/stats/asr_25: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/asr_25 _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Apparent surface reflectance at 25 hz, averaged to the sea ice segment. long_name: Apparent Surface Reflectance 25hz source: Sea Ice ATBD units: 1 |
| /gt2r/sea_ice_segments/stats/photon_rate: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/photon_rate _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: photon count rate, averaged over segment long_name: photon rate source: ATBD, section 4.2.2.4 units: photons/shot |
| /gt2r/sea_ice_segments/stats/trim_height_bottom: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/trim_height_bottom _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: minimum height of trimmed photons used in the surface calculation procedure long_name: minimum height of trimmed photons source: ATBD, section 4.2.2.4 units: meters |
| /gt2r/sea_ice_segments/stats/n_photons_define: | Array of 16 bit Integers [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/n_photons_define _FillValue: -1 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Number of photons to gather. long_name: Number of photons defining the segment source: ATBD, section 4.2.2.4 units: 1 |
| /gt2r/sea_ice_segments/stats/backgr_r_25: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/stats/backgr_r_25 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Background count rate, averaged over the segment based on 25 hz atmosphere long_name: Background rate 25hz source: ATL09 units: hz |
| /gt2r/sea_ice_segments/geoseg_end: | Array of 32 bit Integers [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geoseg_end contentType: referenceInformation coordinates: delta_time latitude longitude description: Geolocation segment (geoseg) ID associated with the last photon used in this sea ice segment long_name: Ending GEOSEG source: Sea Ice ATBD units: 1 |
| /gt2r/sea_ice_segments/geolocation/rgt: | Array of 16 bit Integers [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geolocation/rgt contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: The reference ground track (RGT) is the track on the earth at which a specified unit vector within the observatory is pointed. Under nominal operating conditions, there will be no data collected along the RGT, as the RGT is spanned by GT3 and GT4. During slews or off-pointing, it is possible that ground tracks may intersect the RGT. The ICESat-2 mission has 1387 RGTs. long_name: Reference Ground track source: Sea Ice ATBD units: 1 valid_max: 1387 valid_min: 1 |
| /gt2r/sea_ice_segments/geolocation/sigma_lon: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geolocation/sigma_lon _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Estimated uncertainty for the reference photon bounce point east longitude: 1- sigma (degrees). Applies to all other photons in the group. long_name: longitude uncertainty source: Sea Ice ATBD units: degrees |
| /gt2r/sea_ice_segments/geolocation/ref_atm_delay: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geolocation/ref_atm_delay _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Atmospheric path delay, in range, for the reference photon. long_name: Reference Photon Atm. Path Delay source: Sea Ice ATBD units: meters |
| /gt2r/sea_ice_segments/geolocation/beam_azimuth: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geolocation/beam_azimuth _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft). When the spacecraft is precisely at the geodetic zenith, the value will be 99999 degrees. long_name: beam azimuth source: Sea Ice ATBD units: degrees_east |
| /gt2r/sea_ice_segments/geolocation/solar_azimuth: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geolocation/solar_azimuth contentType: physicalMeansurement coordinates: ../delta_time ../latitude ../longitude description: The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot. long_name: solar azimuth source: Sea Ice ATBD units: degrees_east |
| /gt2r/sea_ice_segments/geolocation/ref_atm_delay_derivative: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geolocation/ref_atm_delay_derivative _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Atmospheric path delay derivative with respect to ellipsoid for the reference photon, in meters per meter. long_name: Derivative of Atm. Path Delay source: Sea Ice ATBD units: meters/meter |
| /gt2r/sea_ice_segments/geolocation/sigma_lat: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geolocation/sigma_lat _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Estimated uncertainty for the reference photon bounce point geodetic latitude: 1- sigma (degrees). Applies to all other photons in the group long_name: latitude uncertainty source: Sea Ice ATBD units: 1 |
| /gt2r/sea_ice_segments/geolocation/beam_coelev: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geolocation/beam_coelev _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Co-elevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot. long_name: beam co-elevation source: Sea Ice ATBD units: degrees |
| /gt2r/sea_ice_segments/geolocation/sigma_h: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geolocation/sigma_h _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Estimated uncertainty for the reference photon bounce point ellipsoid height: 1- sigma (m). Error estimates for all other photons in the group are computed with the scale defined below. long_name: height uncertainty source: Sea Ice ATBD units: 1 |
| /gt2r/sea_ice_segments/geolocation/solar_elevation: | Array of 32 bit Reals [ = 0..225002] HDF5_OBJ_FULLPATH: /gt2r/sea_ice_segments/geolocation/solar_elevation contentType: physicalMeansurement coordinates: ../delta_time ../latitude ../longitude description: Solar Angle above or below the plane tangent to the ellipsoid surface at the laser spot. Positive values mean the sun is above the horizon, while negative values mean it is below the horizon. The effect of atmospheric refraction is not included. This is a low precision value, with approximately TBD degree accuracy. long_name: solar elevation source: Sea Ice ATBD units: degrees |
| /gt1l/sea_ice_segments/heights/height_segment_fit_quality_flag: | Array of 16 bit Integers [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/heights/height_segment_fit_quality_flag _FillValue: -1 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Flag describing the quality of the results of the along-track fit. (-1=height value is invalid; 1=ngrid_w < wlength/2; 2=ngrid_w >= wlength/2; 3=ngrid_dt < dtlength/2; 4=ngrid_dt >= dtlength/2; 5=ngrid_dt >= (dtlength-2): where 1 is best and 5 is poor). Heights are reported even if this flag indicates the height is invalid. flag_meanings: invalid best high med low poor flag_values: -1, 1, 2, 3, 4, 5 long_name: height Quality Flag source: ATBD, section 4.2.4.2 units: 1 valid_max: 5 valid_min: -1 |
| /gt1l/sea_ice_segments/heights/height_segment_length_seg: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/heights/height_segment_length_seg contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: along-track length of segment containing n_photons_actual long_name: length of segment source: ATBD, section 4.2.2.4 units: meters |
| /gt1l/sea_ice_segments/heights/height_segment_asr_calc: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/heights/height_segment_asr_calc _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Computed apparent surface reflectance for the sea ice segment. long_name: Calculated Apparent Surface Reflectivity source: Sea Ice ATBD units: 1 |
| /gt1l/sea_ice_segments/heights/height_segment_quality: | Array of 16 bit Integers [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/heights/height_segment_quality contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Height segment quality flag, 1 is good quality, 0 is bad depending on fit, wguassian, or layer flag flag_meanings: bad_quality good_quality flag_values: 0, 1 long_name: Height Segment Quality Flag source: ATBD, section 4.2.4 units: 1 valid_max: 1 valid_min: 0 |
| /gt1l/sea_ice_segments/heights/height_segment_n_pulse_seg: | Array of 32 bit Integers [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/heights/height_segment_n_pulse_seg contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: number of laser pulses long_name: number of laser pulses source: ATBD, section 4.2.2.4 units: 1 |
| /gt1l/sea_ice_segments/heights/across_track_distance: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/heights/across_track_distance contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Across track distance of photons averaged over the sea ice height segment. long_name: Across Track Distance source: ATBD, section 4.2.4 units: meters |
| /gt1l/sea_ice_segments/heights/height_segment_htcorr_skew: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/heights/height_segment_htcorr_skew _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: height corection for skew long_name: Height Correction for Skew source: ATBD, section 4.2.6 units: meters |
| /gt1l/sea_ice_segments/heights/height_segment_ssh_flag: | Array of 16 bit Integers [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/heights/height_segment_ssh_flag contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Identifies the height segments that are candidates for use as sea surface reference in freeboard calculations in ATL10. 0 = sea ice; 1 = sea surface flag_meanings: sea_ice sea_surface flag_values: 0, 1 long_name: Sea Surface Flag source: ATBD, section 4.3 units: 1 valid_max: 1 valid_min: 0 |
| /gt1l/sea_ice_segments/heights/height_segment_height: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/heights/height_segment_height coordinates: ../delta_time ../latitude ../longitude description: Mean height from along-track segment fit detremined by the sea ice algorithm long_name: height of segment surface source: ATBD, section 4.2.2.4 units: meters _FillValue: 3.402823466e+38 contentType: referenceInformation |
| /gt1l/sea_ice_segments/heights/height_segment_type: | Array of 16 bit Integers [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/heights/height_segment_type contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Value that indicates segment surface type as sea ice or different types of sea surface. 0=cloud covered: rsurf flag_meanings: cloud_covered other specular_lead_low_w_bkg specular_lead_low specular_lead_high_w_bkg specular_lead_high dark_lead_smooth_w_bkg dark_lead_smooth dark_lead_rough_w_bkg dark_lead_rough flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 long_name: Segment surface type source: ATBD, section 4.3 units: 1 valid_max: 9 valid_min: 0 |
| /gt1l/sea_ice_segments/heights/height_segment_confidence: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/heights/height_segment_confidence _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Confidence level in the surface height estimate based on the number of photons; the background noise rate; and the error analysis long_name: Surface height confidence source: ATBD, section 4.2.4.2 units: 1 |
| /gt1l/sea_ice_segments/heights/height_segment_surface_error_est: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/heights/height_segment_surface_error_est _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Error estimate of the surface height long_name: h surface error est source: ATBD, section 4.2.2.4 units: meters |
| /gt1l/sea_ice_segments/heights/height_segment_w_gaussian: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/heights/height_segment_w_gaussian _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: width of best fit gaussian long_name: width of best fit gaussian source: ATBD, section 4.2.4 units: meters |
| /gt1l/sea_ice_segments/heights/height_segment_rms: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/heights/height_segment_rms _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: RMS difference between sea ice modeled and observed photon height distribution long_name: height rms source: ATBD, section 4.2.2.4 units: meters |
| /gt1l/sea_ice_segments/height_segment_id: | Array of 32 bit Integers [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/height_segment_id contentType: referenceInformation coordinates: delta_time latitude longitude description: Identifier of each height segment long_name: Identifier of each height segment source: ATBD, section 5.2 units: 1 |
| /gt1l/sea_ice_segments/seg_dist_x: | Array of 64 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/seg_dist_x contentType: referenceInformation coordinates: delta_time latitude longitude description: Along-track distance from the equator crossing to the segment center. long_name: Along track distance source: Sea Ice ATBD units: meters |
| /gt1l/sea_ice_segments/longitude: | Array of 64 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/longitude contentType: referenceInformation coordinates: delta_time latitude description: Longitude, WGS84, East=+,Lon of segment center long_name: Longitude source: ATBD, section 4.4 standard_name: longitude units: degrees_east valid_max: 180. valid_min: -180. |
| /gt1l/sea_ice_segments/latitude: | Array of 64 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/latitude contentType: referenceInformation coordinates: delta_time longitude description: Latitude, WGS84, North=+, Lat of segment center long_name: Latitude source: ATBD, section 4.4 standard_name: latitude units: degrees_north valid_max: 90. valid_min: -90. |
| /gt1l/sea_ice_segments/geophysical/height_segment_t2m: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geophysical/height_segment_t2m _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Temperature at 2m above the displacement height (K) long_name: temperature_at_2m source: ATL09 standard_name: temperature units: K |
| /gt1l/sea_ice_segments/geophysical/height_segment_dac: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geophysical/height_segment_dac _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect. long_name: Dynamic Atmosphere Correction source: Sea Ice ATBD units: meters |
| /gt1l/sea_ice_segments/geophysical/height_segment_ps: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geophysical/height_segment_ps _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Sea Level Pressure (Pa) long_name: sea level pressure source: ATL09 standard_name: pressure units: Pa |
| /gt1l/sea_ice_segments/geophysical/height_segment_ib: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geophysical/height_segment_ib _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Inverted barometer effect calculated from surface pressure long_name: Inverted barometer effect source: ATBD, section 4.2 units: meters |
| /gt1l/sea_ice_segments/geophysical/height_segment_load: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geophysical/height_segment_load _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm). long_name: Load Tide source: Sea Ice ATBD units: meters |
| /gt1l/sea_ice_segments/geophysical/height_segment_geoid: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geophysical/height_segment_geoid _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Geoid height above WGS-84 reference ellipsoid (range -107 to 86m), based on the EGM2008 model. long_name: EGM2008 Geoid source: Sea Ice ATBD units: meters |
| /gt1l/sea_ice_segments/geophysical/height_segment_ocean: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geophysical/height_segment_ocean _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium) long_name: Ocean Tide source: Sea Ice ATBD units: meters |
| /gt1l/sea_ice_segments/geophysical/height_segment_v2m: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geophysical/height_segment_v2m _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Northward wind at 2m above the displacement height (m/s-1) long_name: Northward_wind_at_2m source: ATL09 standard_name: northward_wind units: m s-1 |
| /gt1l/sea_ice_segments/geophysical/height_segment_mss: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geophysical/height_segment_mss _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Mean sea surface height above WGS-84 reference ellipsoid (range: -105 to 87m), based on the DTU13 model. long_name: DTU13 Mean Sea Surface source: Sea Ice ATBD units: meters |
| /gt1l/sea_ice_segments/geophysical/height_segment_u2m: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geophysical/height_segment_u2m _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Eastward wind at 2m above the displacement height (m/s-1) long_name: Eastward_wind_at_2m source: ATL09 standard_name: eastward_wind units: m s-1 |
| /gt1l/sea_ice_segments/geophysical/height_segment_lpe: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geophysical/height_segment_lpe _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Long period equilibrium tide self-consistent with ocean tide model (+-0.04m). (dependent only on time and latitude) long_name: Equilibrium Tide source: Sea Ice ATBD units: meters |
| /gt1l/sea_ice_segments/geophysical/height_segment_earth: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geophysical/height_segment_earth _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Solid Earth Tide long_name: Earth Tide source: Sea Ice ATBD units: meters |
| /gt1l/sea_ice_segments/geophysical/height_segment_pole: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geophysical/height_segment_pole coordinates: ../delta_time ../latitude ../longitude description: Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm). long_name: Pole Tide source: Sea Ice ATBD units: meters _FillValue: 3.402823466e+38 contentType: referenceInformation |
| /gt1l/sea_ice_segments/geoseg_beg: | Array of 32 bit Integers [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geoseg_beg contentType: referenceInformation coordinates: delta_time latitude longitude description: Geolocation segment (geoseg) ID associated with the first photon used in this sea ice segment long_name: Beginning GEOSEG source: Sea Ice ATBD units: 1 |
| /gt1l/sea_ice_segments/delta_time: | Array of 64 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/delta_time contentType: physicalMeasurement coordinates: latitude longitude description: Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name: Elapsed GPS seconds source: telemetry standard_name: time units: seconds since 2018-01-01 CLASS: DIMENSION_SCALE NAME: gt1l/sea_ice_segments/delta_time |
| /gt1l/sea_ice_segments/stats/msw_flag: | Array of 16 bit Integers [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/msw_flag contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Multiple Scattering warning flag. The multiple scattering warning flag (ATL09 parameter msw_flag) has values from -1 to 5 where zero means no multiple scattering and 5 the greatest. If no layers were detected, then msw_flag = 0. If blowing snow is detected and its estimated optical depth is greater than or equal to 0.5, then msw_flag = 5. If the blowing snow optical depth is less than 0.5, then msw_flag = 4. If no blowing snow is detected but there are cloud or aerosol layers detected, the msw_flag assumes values of 1 to 3 based on the height of the bottom of the lowest layer: < 1 km, msw_flag = 3; 1-3 km, msw_flag = 2; > 3km, msw_flag = 1. A value of -1 indicates that the signal to noise of the data was too low to reliably ascertain the presence of cloud or blowing snow. We expect values of -1 to occur only during daylight. flag_meanings: cannot_determine no_layers layer_gt_3km layer_between_1_and_3_km layer_lt_1km blow_snow_od_lt_0.5 blow_snow_od_gt_0.5 flag_values: -1, 0, 1, 2, 3, 4, 5 long_name: Multiple Scattering Warning Flag source: Atmosphere ATBD units: 1 valid_max: 5 valid_min: -1 |
| /gt1l/sea_ice_segments/stats/hist_median_h: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/hist_median_h _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Median of the n_fit_photons heights long_name: trimmed photon heights median source: ATBD, section 4.2.3.1 units: meters |
| /gt1l/sea_ice_segments/stats/height_filter_min: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/height_filter_min _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: height minimum used in the ssh height filter long_name: Height Filter Min source: sea ice ATBD , sect 4.2.1.2 units: meters |
| /gt1l/sea_ice_segments/stats/cloud_flag_atm: | Array of 16 bit Integers [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/cloud_flag_atm contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Number of layers found from the backscatter profile using the DDA layer finder. long_name: Cloud Flag Atm source: Atmosphere ATBD units: 1 valid_max: 10 valid_min: 0 |
| /gt1l/sea_ice_segments/stats/fpb_avg_dt: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/fpb_avg_dt _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: FPB correction average dead time long_name: fpb correction average deadtime source: Sea Ice ATBD units: ns |
| /gt1l/sea_ice_segments/stats/ds_si_hist_bins: | Array of 32 bit Integers [ = 0..220] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/ds_si_hist_bins CLASS: DIMENSION_SCALE NAME: ds_si_hist_bins contentType: auxiliaryInformation description: Dimension scale indexing the sea ice histogram bins. The bin heights must be computed from information contained within the same group as the histogram. long_name: Sea Ice Histogram Bins Dimension Scale source: SeaIce ATBD units: 1 |
| /gt1l/sea_ice_segments/stats/fpb_strength: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/fpb_strength _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: FPB correction strength long_name: fpb correction strength source: Sea Ice ATBD units: photons/shot |
| /gt1l/sea_ice_segments/stats/bsnow_con: | Array of 16 bit Integers [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/bsnow_con _FillValue: 127 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Blowing snow confidence long_name: Blowing snow confidence source: ATL09 units: 1 |
| /gt1l/sea_ice_segments/stats/layer_flag: | Array of 16 bit Integers [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/layer_flag contentType: qualityInformation coordinates: ../delta_time ../latitude ../longitude description: This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow. flag_meanings: likely_clear likely_cloudy flag_values: 0, 1 long_name: Consolidated cloud flag source: Atmosphere ATBD units: 1 valid_max: 1 valid_min: 0 |
| /gt1l/sea_ice_segments/stats/hist_photon_bin_size: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/hist_photon_bin_size contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: bin size of photon height histogram long_name: height histogram bin size source: ATBD, section 4.2.2.4 units: meters |
| /gt1l/sea_ice_segments/stats/backgr_calc: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/backgr_calc _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Calculated background count rate based on sun angle, surface slope, unit reflectance long_name: background count rate calculated source: ATBD, section 4.2.3 units: hz |
| /gt1l/sea_ice_segments/stats/fpb_corr: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/fpb_corr _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Estimated first-photon bias(fpb) correction to mean segment height long_name: first photon bias correction source: Sea Ice ATBD units: meters |
| /gt1l/sea_ice_segments/stats/bsnow_h: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/bsnow_h _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Blowing snow layer top height long_name: Blowing snow top h source: ATL09 units: meters |
| /gt1l/sea_ice_segments/stats/hist_photon_bottom: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/hist_photon_bottom contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: lower bound of height histogram long_name: height histogram minimum source: ATBD, section 4.2.2.4 units: meters |
| /gt1l/sea_ice_segments/stats/background_r_norm: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/background_r_norm _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Background rate normalized to a fixed solar elevation angle long_name: Normalized background (50-shot) source: ATBD section 4.3.1.3 units: hz |
| /gt1l/sea_ice_segments/stats/exmax_mean_2: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/exmax_mean_2 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height mean 2 long_name: Exmax Mean 2 source: sea ice ATBD Appendix E units: meters |
| /gt1l/sea_ice_segments/stats/background_int_height: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/background_int_height _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: The height of the altimetric range window after subtracting the height span of the signal photon events in the 50-shot span long_name: Height of column used in background calculation source: ATBD, section 7.3 units: meters |
| /gt1l/sea_ice_segments/stats/n_photons_actual: | Array of 16 bit Integers [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/n_photons_actual _FillValue: -1 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Number of photons gathered long_name: Number of photons found for the segment source: ATBD, section 4.2.2.4 units: 1 |
| /gt1l/sea_ice_segments/stats/ice_conc: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/ice_conc contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: sea ice concentration long_name: sea ice concentration source: ATBD, section 3.1.4 units: 1 |
| /gt1l/sea_ice_segments/stats/exmax_stdev_2: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/exmax_stdev_2 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height standard deviation 2 long_name: Exmax Stdev 2 source: sea ice ATBD Appendix E units: meters |
| /gt1l/sea_ice_segments/stats/cloud_flag_asr: | Array of 16 bit Integers [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/cloud_flag_asr contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Cloud flag (probability) from apparent surface reflectance. 0=clear with high confidence; 1=clear with medium confidence; 2=clear with low confidence; 3=cloudy with low confidence; 4=cloudy with medium confidence; 5=cloudy with high confidence; 6=unknown flag_meanings: clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence unknown flag_values: 0, 1, 2, 3, 4, 5, 6 long_name: Cloud Flag ASR source: Atmosphere ATBD units: 1 valid_max: 6 valid_min: 0 |
| /gt1l/sea_ice_segments/stats/exmax_stdev_1: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/exmax_stdev_1 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height standard deviation 1 long_name: Exmax Stdev 1 source: sea ice ATBD Appendix E units: meters |
| /gt1l/sea_ice_segments/stats/fpb_corr_width: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/fpb_corr_width _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: FPB correction width long_name: fpb correction width source: Sea Ice ATBD units: ns |
| /gt1l/sea_ice_segments/stats/height_coarse_stdev: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/height_coarse_stdev contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: height standard deviation of coarse tracker long_name: Coarse Height Sdev source: sea ice ATBD , sect 4.2.1.2 units: meters |
| /gt1l/sea_ice_segments/stats/height_filter_05: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/height_filter_05 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: height fifth percentile used in the ssh height filter long_name: Height Filter 5th Percentile source: sea ice ATBD , sect 4.2.1.2 units: meters |
| /gt1l/sea_ice_segments/stats/n_photons_used: | Array of 16 bit Integers [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/n_photons_used _FillValue: -1 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Number of photons in the trimmed histogram. long_name: Number of photons used for fit source: ATBD, section 4.2.2.4 units: 1 |
| /gt1l/sea_ice_segments/stats/backgr_r_200: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/backgr_r_200 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Background count rate, averaged over the segment based on ATLAS 50 pulse counts long_name: Background rate 200 hz source: ATL09 units: hz |
| /gt1l/sea_ice_segments/stats/hist_photon_top: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/hist_photon_top contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: upper bound of height histogram long_name: height histogram maximum source: ATBD, section 4.2.2.4 units: meters |
| /gt1l/sea_ice_segments/stats/hist_w: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/hist_w _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Segment histogram width estimate long_name: Segment histogram width estimate source: ATBD, section 4.2.2.4 units: meters |
| /gt1l/sea_ice_segments/stats/hist_mean_h: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/hist_mean_h _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Mean of the n_fit_photons heights long_name: photon heights mean source: ATBD, section 4.2.2.4 units: meters |
| /gt1l/sea_ice_segments/stats/height_coarse_mn: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/height_coarse_mn contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: height mean of coarse tracker long_name: Coarse Track Height Mean source: sea ice ATBD , sect 4.2.1.2 units: meters |
| /gt1l/sea_ice_segments/stats/exmax_mean_1: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/exmax_mean_1 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height mean 1 long_name: Exmax Mean 1 source: sea ice ATBD Appendix E units: meters |
| /gt1l/sea_ice_segments/stats/hist_photon_heights: | Array of 16 bit Integers [ = 0..276542][ = 0..220] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/hist_photon_heights contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Histogram of the n_fit_photons heights long_name: photon heights histogram source: ATBD, section 4.2.2.4 units: 1 |
| /gt1l/sea_ice_segments/stats/trim_height_top: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/trim_height_top _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: maximum height of trimmed photons used in the surface calculation procedure long_name: maximum height of trimmed photons source: ATBD, section 4.2.2.4 units: meters |
| /gt1l/sea_ice_segments/stats/exmax_mix: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/exmax_mix _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height mix ratio long_name: Exmax Mix source: sea ice ATBD Appendix E units: meters |
| /gt1l/sea_ice_segments/stats/asr_25: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/asr_25 _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Apparent surface reflectance at 25 hz, averaged to the sea ice segment. long_name: Apparent Surface Reflectance 25hz source: Sea Ice ATBD units: 1 |
| /gt1l/sea_ice_segments/stats/photon_rate: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/photon_rate _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: photon count rate, averaged over segment long_name: photon rate source: ATBD, section 4.2.2.4 units: photons/shot |
| /gt1l/sea_ice_segments/stats/trim_height_bottom: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/trim_height_bottom _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: minimum height of trimmed photons used in the surface calculation procedure long_name: minimum height of trimmed photons source: ATBD, section 4.2.2.4 units: meters |
| /gt1l/sea_ice_segments/stats/n_photons_define: | Array of 16 bit Integers [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/n_photons_define _FillValue: -1 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Number of photons to gather. long_name: Number of photons defining the segment source: ATBD, section 4.2.2.4 units: 1 |
| /gt1l/sea_ice_segments/stats/backgr_r_25: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/stats/backgr_r_25 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Background count rate, averaged over the segment based on 25 hz atmosphere long_name: Background rate 25hz source: ATL09 units: hz |
| /gt1l/sea_ice_segments/geoseg_end: | Array of 32 bit Integers [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geoseg_end contentType: referenceInformation coordinates: delta_time latitude longitude description: Geolocation segment (geoseg) ID associated with the last photon used in this sea ice segment long_name: Ending GEOSEG source: Sea Ice ATBD units: 1 |
| /gt1l/sea_ice_segments/geolocation/rgt: | Array of 16 bit Integers [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geolocation/rgt contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: The reference ground track (RGT) is the track on the earth at which a specified unit vector within the observatory is pointed. Under nominal operating conditions, there will be no data collected along the RGT, as the RGT is spanned by GT3 and GT4. During slews or off-pointing, it is possible that ground tracks may intersect the RGT. The ICESat-2 mission has 1387 RGTs. long_name: Reference Ground track source: Sea Ice ATBD units: 1 valid_max: 1387 valid_min: 1 |
| /gt1l/sea_ice_segments/geolocation/sigma_lon: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geolocation/sigma_lon _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Estimated uncertainty for the reference photon bounce point east longitude: 1- sigma (degrees). Applies to all other photons in the group. long_name: longitude uncertainty source: Sea Ice ATBD units: degrees |
| /gt1l/sea_ice_segments/geolocation/ref_atm_delay: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geolocation/ref_atm_delay _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Atmospheric path delay, in range, for the reference photon. long_name: Reference Photon Atm. Path Delay source: Sea Ice ATBD units: meters |
| /gt1l/sea_ice_segments/geolocation/beam_azimuth: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geolocation/beam_azimuth _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft). When the spacecraft is precisely at the geodetic zenith, the value will be 99999 degrees. long_name: beam azimuth source: Sea Ice ATBD units: degrees_east |
| /gt1l/sea_ice_segments/geolocation/solar_azimuth: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geolocation/solar_azimuth contentType: physicalMeansurement coordinates: ../delta_time ../latitude ../longitude description: The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot. long_name: solar azimuth source: Sea Ice ATBD units: degrees_east |
| /gt1l/sea_ice_segments/geolocation/ref_atm_delay_derivative: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geolocation/ref_atm_delay_derivative _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Atmospheric path delay derivative with respect to ellipsoid for the reference photon, in meters per meter. long_name: Derivative of Atm. Path Delay source: Sea Ice ATBD units: meters/meter |
| /gt1l/sea_ice_segments/geolocation/sigma_lat: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geolocation/sigma_lat _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Estimated uncertainty for the reference photon bounce point geodetic latitude: 1- sigma (degrees). Applies to all other photons in the group long_name: latitude uncertainty source: Sea Ice ATBD units: 1 |
| /gt1l/sea_ice_segments/geolocation/beam_coelev: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geolocation/beam_coelev _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Co-elevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot. long_name: beam co-elevation source: Sea Ice ATBD units: degrees |
| /gt1l/sea_ice_segments/geolocation/sigma_h: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geolocation/sigma_h _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Estimated uncertainty for the reference photon bounce point ellipsoid height: 1- sigma (m). Error estimates for all other photons in the group are computed with the scale defined below. long_name: height uncertainty source: Sea Ice ATBD units: 1 |
| /gt1l/sea_ice_segments/geolocation/solar_elevation: | Array of 32 bit Reals [ = 0..276542] HDF5_OBJ_FULLPATH: /gt1l/sea_ice_segments/geolocation/solar_elevation contentType: physicalMeansurement coordinates: ../delta_time ../latitude ../longitude description: Solar Angle above or below the plane tangent to the ellipsoid surface at the laser spot. Positive values mean the sun is above the horizon, while negative values mean it is below the horizon. The effect of atmospheric refraction is not included. This is a low precision value, with approximately TBD degree accuracy. long_name: solar elevation source: Sea Ice ATBD units: degrees |
| /quality_assessment/qa_granule_fail_reason: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /quality_assessment/qa_granule_fail_reason contentType: qualityInformation description: Flag indicating granule failure reason. 0=no failure; 1=processing error; 2=Insufficient output data was generated; 3=TBD Failure; 4=TBD_Failure; 5=other failure. flag_meanings: no_failure PROCESS_ERROR INSUFFICIENT_OUTPUT failure_3 failure_4 OTHER_FAILURE flag_values: 0, 1, 2, 3, 4, 5 long_name: Granule Failure Reason source: Operations units: 1 valid_max: 5 valid_min: 0 |
| /quality_assessment/qa_granule_pass_fail: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /quality_assessment/qa_granule_pass_fail contentType: qualityInformation description: Flag indicating granule quality. 0=granule passes automatic QA. 1=granule fails automatic QA. flag_meanings: PASS FAIL flag_values: 0, 1 long_name: Granule Pass Flag source: Operations units: 1 valid_max: 1 valid_min: 0 |
| /gt3l/sea_ice_segments/heights/height_segment_fit_quality_flag: | Array of 16 bit Integers [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/heights/height_segment_fit_quality_flag _FillValue: -1 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Flag describing the quality of the results of the along-track fit. (-1=height value is invalid; 1=ngrid_w < wlength/2; 2=ngrid_w >= wlength/2; 3=ngrid_dt < dtlength/2; 4=ngrid_dt >= dtlength/2; 5=ngrid_dt >= (dtlength-2): where 1 is best and 5 is poor). Heights are reported even if this flag indicates the height is invalid. flag_meanings: invalid best high med low poor flag_values: -1, 1, 2, 3, 4, 5 long_name: height Quality Flag source: ATBD, section 4.2.4.2 units: 1 valid_max: 5 valid_min: -1 |
| /gt3l/sea_ice_segments/heights/height_segment_length_seg: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/heights/height_segment_length_seg contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: along-track length of segment containing n_photons_actual long_name: length of segment source: ATBD, section 4.2.2.4 units: meters |
| /gt3l/sea_ice_segments/heights/height_segment_asr_calc: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/heights/height_segment_asr_calc _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Computed apparent surface reflectance for the sea ice segment. long_name: Calculated Apparent Surface Reflectivity source: Sea Ice ATBD units: 1 |
| /gt3l/sea_ice_segments/heights/height_segment_quality: | Array of 16 bit Integers [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/heights/height_segment_quality contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Height segment quality flag, 1 is good quality, 0 is bad depending on fit, wguassian, or layer flag flag_meanings: bad_quality good_quality flag_values: 0, 1 long_name: Height Segment Quality Flag source: ATBD, section 4.2.4 units: 1 valid_max: 1 valid_min: 0 |
| /gt3l/sea_ice_segments/heights/height_segment_n_pulse_seg: | Array of 32 bit Integers [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/heights/height_segment_n_pulse_seg contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: number of laser pulses long_name: number of laser pulses source: ATBD, section 4.2.2.4 units: 1 |
| /gt3l/sea_ice_segments/heights/across_track_distance: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/heights/across_track_distance contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Across track distance of photons averaged over the sea ice height segment. long_name: Across Track Distance source: ATBD, section 4.2.4 units: meters |
| /gt3l/sea_ice_segments/heights/height_segment_htcorr_skew: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/heights/height_segment_htcorr_skew _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: height corection for skew long_name: Height Correction for Skew source: ATBD, section 4.2.6 units: meters |
| /gt3l/sea_ice_segments/heights/height_segment_ssh_flag: | Array of 16 bit Integers [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/heights/height_segment_ssh_flag contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Identifies the height segments that are candidates for use as sea surface reference in freeboard calculations in ATL10. 0 = sea ice; 1 = sea surface flag_meanings: sea_ice sea_surface flag_values: 0, 1 long_name: Sea Surface Flag source: ATBD, section 4.3 units: 1 valid_max: 1 valid_min: 0 |
| /gt3l/sea_ice_segments/heights/height_segment_height: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/heights/height_segment_height coordinates: ../delta_time ../latitude ../longitude description: Mean height from along-track segment fit detremined by the sea ice algorithm long_name: height of segment surface source: ATBD, section 4.2.2.4 units: meters _FillValue: 3.402823466e+38 contentType: referenceInformation |
| /gt3l/sea_ice_segments/heights/height_segment_type: | Array of 16 bit Integers [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/heights/height_segment_type contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Value that indicates segment surface type as sea ice or different types of sea surface. 0=cloud covered: rsurf flag_meanings: cloud_covered other specular_lead_low_w_bkg specular_lead_low specular_lead_high_w_bkg specular_lead_high dark_lead_smooth_w_bkg dark_lead_smooth dark_lead_rough_w_bkg dark_lead_rough flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 long_name: Segment surface type source: ATBD, section 4.3 units: 1 valid_max: 9 valid_min: 0 |
| /gt3l/sea_ice_segments/heights/height_segment_confidence: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/heights/height_segment_confidence _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Confidence level in the surface height estimate based on the number of photons; the background noise rate; and the error analysis long_name: Surface height confidence source: ATBD, section 4.2.4.2 units: 1 |
| /gt3l/sea_ice_segments/heights/height_segment_surface_error_est: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/heights/height_segment_surface_error_est _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Error estimate of the surface height long_name: h surface error est source: ATBD, section 4.2.2.4 units: meters |
| /gt3l/sea_ice_segments/heights/height_segment_w_gaussian: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/heights/height_segment_w_gaussian _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: width of best fit gaussian long_name: width of best fit gaussian source: ATBD, section 4.2.4 units: meters |
| /gt3l/sea_ice_segments/heights/height_segment_rms: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/heights/height_segment_rms _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: RMS difference between sea ice modeled and observed photon height distribution long_name: height rms source: ATBD, section 4.2.2.4 units: meters |
| /gt3l/sea_ice_segments/height_segment_id: | Array of 32 bit Integers [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/height_segment_id contentType: referenceInformation coordinates: delta_time latitude longitude description: Identifier of each height segment long_name: Identifier of each height segment source: ATBD, section 5.2 units: 1 |
| /gt3l/sea_ice_segments/seg_dist_x: | Array of 64 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/seg_dist_x contentType: referenceInformation coordinates: delta_time latitude longitude description: Along-track distance from the equator crossing to the segment center. long_name: Along track distance source: Sea Ice ATBD units: meters |
| /gt3l/sea_ice_segments/longitude: | Array of 64 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/longitude contentType: referenceInformation coordinates: delta_time latitude description: Longitude, WGS84, East=+,Lon of segment center long_name: Longitude source: ATBD, section 4.4 standard_name: longitude units: degrees_east valid_max: 180. valid_min: -180. |
| /gt3l/sea_ice_segments/latitude: | Array of 64 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/latitude contentType: referenceInformation coordinates: delta_time longitude description: Latitude, WGS84, North=+, Lat of segment center long_name: Latitude source: ATBD, section 4.4 standard_name: latitude units: degrees_north valid_max: 90. valid_min: -90. |
| /gt3l/sea_ice_segments/geophysical/height_segment_t2m: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geophysical/height_segment_t2m _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Temperature at 2m above the displacement height (K) long_name: temperature_at_2m source: ATL09 standard_name: temperature units: K |
| /gt3l/sea_ice_segments/geophysical/height_segment_dac: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geophysical/height_segment_dac _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect. long_name: Dynamic Atmosphere Correction source: Sea Ice ATBD units: meters |
| /gt3l/sea_ice_segments/geophysical/height_segment_ps: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geophysical/height_segment_ps _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Sea Level Pressure (Pa) long_name: sea level pressure source: ATL09 standard_name: pressure units: Pa |
| /gt3l/sea_ice_segments/geophysical/height_segment_ib: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geophysical/height_segment_ib _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Inverted barometer effect calculated from surface pressure long_name: Inverted barometer effect source: ATBD, section 4.2 units: meters |
| /gt3l/sea_ice_segments/geophysical/height_segment_load: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geophysical/height_segment_load _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm). long_name: Load Tide source: Sea Ice ATBD units: meters |
| /gt3l/sea_ice_segments/geophysical/height_segment_geoid: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geophysical/height_segment_geoid _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Geoid height above WGS-84 reference ellipsoid (range -107 to 86m), based on the EGM2008 model. long_name: EGM2008 Geoid source: Sea Ice ATBD units: meters |
| /gt3l/sea_ice_segments/geophysical/height_segment_ocean: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geophysical/height_segment_ocean _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium) long_name: Ocean Tide source: Sea Ice ATBD units: meters |
| /gt3l/sea_ice_segments/geophysical/height_segment_v2m: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geophysical/height_segment_v2m _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Northward wind at 2m above the displacement height (m/s-1) long_name: Northward_wind_at_2m source: ATL09 standard_name: northward_wind units: m s-1 |
| /gt3l/sea_ice_segments/geophysical/height_segment_mss: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geophysical/height_segment_mss _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Mean sea surface height above WGS-84 reference ellipsoid (range: -105 to 87m), based on the DTU13 model. long_name: DTU13 Mean Sea Surface source: Sea Ice ATBD units: meters |
| /gt3l/sea_ice_segments/geophysical/height_segment_u2m: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geophysical/height_segment_u2m _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Eastward wind at 2m above the displacement height (m/s-1) long_name: Eastward_wind_at_2m source: ATL09 standard_name: eastward_wind units: m s-1 |
| /gt3l/sea_ice_segments/geophysical/height_segment_lpe: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geophysical/height_segment_lpe _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Long period equilibrium tide self-consistent with ocean tide model (+-0.04m). (dependent only on time and latitude) long_name: Equilibrium Tide source: Sea Ice ATBD units: meters |
| /gt3l/sea_ice_segments/geophysical/height_segment_earth: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geophysical/height_segment_earth _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Solid Earth Tide long_name: Earth Tide source: Sea Ice ATBD units: meters |
| /gt3l/sea_ice_segments/geophysical/height_segment_pole: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geophysical/height_segment_pole coordinates: ../delta_time ../latitude ../longitude description: Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm). long_name: Pole Tide source: Sea Ice ATBD units: meters _FillValue: 3.402823466e+38 contentType: referenceInformation |
| /gt3l/sea_ice_segments/geoseg_beg: | Array of 32 bit Integers [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geoseg_beg contentType: referenceInformation coordinates: delta_time latitude longitude description: Geolocation segment (geoseg) ID associated with the first photon used in this sea ice segment long_name: Beginning GEOSEG source: Sea Ice ATBD units: 1 |
| /gt3l/sea_ice_segments/delta_time: | Array of 64 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/delta_time contentType: physicalMeasurement coordinates: latitude longitude description: Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name: Elapsed GPS seconds source: telemetry standard_name: time units: seconds since 2018-01-01 CLASS: DIMENSION_SCALE NAME: gt3l/sea_ice_segments/delta_time |
| /gt3l/sea_ice_segments/stats/msw_flag: | Array of 16 bit Integers [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/msw_flag contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Multiple Scattering warning flag. The multiple scattering warning flag (ATL09 parameter msw_flag) has values from -1 to 5 where zero means no multiple scattering and 5 the greatest. If no layers were detected, then msw_flag = 0. If blowing snow is detected and its estimated optical depth is greater than or equal to 0.5, then msw_flag = 5. If the blowing snow optical depth is less than 0.5, then msw_flag = 4. If no blowing snow is detected but there are cloud or aerosol layers detected, the msw_flag assumes values of 1 to 3 based on the height of the bottom of the lowest layer: < 1 km, msw_flag = 3; 1-3 km, msw_flag = 2; > 3km, msw_flag = 1. A value of -1 indicates that the signal to noise of the data was too low to reliably ascertain the presence of cloud or blowing snow. We expect values of -1 to occur only during daylight. flag_meanings: cannot_determine no_layers layer_gt_3km layer_between_1_and_3_km layer_lt_1km blow_snow_od_lt_0.5 blow_snow_od_gt_0.5 flag_values: -1, 0, 1, 2, 3, 4, 5 long_name: Multiple Scattering Warning Flag source: Atmosphere ATBD units: 1 valid_max: 5 valid_min: -1 |
| /gt3l/sea_ice_segments/stats/hist_median_h: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/hist_median_h _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Median of the n_fit_photons heights long_name: trimmed photon heights median source: ATBD, section 4.2.3.1 units: meters |
| /gt3l/sea_ice_segments/stats/height_filter_min: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/height_filter_min _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: height minimum used in the ssh height filter long_name: Height Filter Min source: sea ice ATBD , sect 4.2.1.2 units: meters |
| /gt3l/sea_ice_segments/stats/cloud_flag_atm: | Array of 16 bit Integers [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/cloud_flag_atm contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Number of layers found from the backscatter profile using the DDA layer finder. long_name: Cloud Flag Atm source: Atmosphere ATBD units: 1 valid_max: 10 valid_min: 0 |
| /gt3l/sea_ice_segments/stats/fpb_avg_dt: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/fpb_avg_dt _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: FPB correction average dead time long_name: fpb correction average deadtime source: Sea Ice ATBD units: ns |
| /gt3l/sea_ice_segments/stats/ds_si_hist_bins: | Array of 32 bit Integers [ = 0..220] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/ds_si_hist_bins CLASS: DIMENSION_SCALE NAME: ds_si_hist_bins contentType: auxiliaryInformation description: Dimension scale indexing the sea ice histogram bins. The bin heights must be computed from information contained within the same group as the histogram. long_name: Sea Ice Histogram Bins Dimension Scale source: SeaIce ATBD units: 1 |
| /gt3l/sea_ice_segments/stats/fpb_strength: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/fpb_strength _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: FPB correction strength long_name: fpb correction strength source: Sea Ice ATBD units: photons/shot |
| /gt3l/sea_ice_segments/stats/bsnow_con: | Array of 16 bit Integers [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/bsnow_con _FillValue: 127 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Blowing snow confidence long_name: Blowing snow confidence source: ATL09 units: 1 |
| /gt3l/sea_ice_segments/stats/layer_flag: | Array of 16 bit Integers [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/layer_flag contentType: qualityInformation coordinates: ../delta_time ../latitude ../longitude description: This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow. flag_meanings: likely_clear likely_cloudy flag_values: 0, 1 long_name: Consolidated cloud flag source: Atmosphere ATBD units: 1 valid_max: 1 valid_min: 0 |
| /gt3l/sea_ice_segments/stats/hist_photon_bin_size: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/hist_photon_bin_size contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: bin size of photon height histogram long_name: height histogram bin size source: ATBD, section 4.2.2.4 units: meters |
| /gt3l/sea_ice_segments/stats/backgr_calc: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/backgr_calc _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Calculated background count rate based on sun angle, surface slope, unit reflectance long_name: background count rate calculated source: ATBD, section 4.2.3 units: hz |
| /gt3l/sea_ice_segments/stats/fpb_corr: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/fpb_corr _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Estimated first-photon bias(fpb) correction to mean segment height long_name: first photon bias correction source: Sea Ice ATBD units: meters |
| /gt3l/sea_ice_segments/stats/bsnow_h: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/bsnow_h _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Blowing snow layer top height long_name: Blowing snow top h source: ATL09 units: meters |
| /gt3l/sea_ice_segments/stats/hist_photon_bottom: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/hist_photon_bottom contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: lower bound of height histogram long_name: height histogram minimum source: ATBD, section 4.2.2.4 units: meters |
| /gt3l/sea_ice_segments/stats/background_r_norm: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/background_r_norm _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Background rate normalized to a fixed solar elevation angle long_name: Normalized background (50-shot) source: ATBD section 4.3.1.3 units: hz |
| /gt3l/sea_ice_segments/stats/exmax_mean_2: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/exmax_mean_2 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height mean 2 long_name: Exmax Mean 2 source: sea ice ATBD Appendix E units: meters |
| /gt3l/sea_ice_segments/stats/background_int_height: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/background_int_height _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: The height of the altimetric range window after subtracting the height span of the signal photon events in the 50-shot span long_name: Height of column used in background calculation source: ATBD, section 7.3 units: meters |
| /gt3l/sea_ice_segments/stats/n_photons_actual: | Array of 16 bit Integers [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/n_photons_actual _FillValue: -1 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Number of photons gathered long_name: Number of photons found for the segment source: ATBD, section 4.2.2.4 units: 1 |
| /gt3l/sea_ice_segments/stats/ice_conc: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/ice_conc contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: sea ice concentration long_name: sea ice concentration source: ATBD, section 3.1.4 units: 1 |
| /gt3l/sea_ice_segments/stats/exmax_stdev_2: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/exmax_stdev_2 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height standard deviation 2 long_name: Exmax Stdev 2 source: sea ice ATBD Appendix E units: meters |
| /gt3l/sea_ice_segments/stats/cloud_flag_asr: | Array of 16 bit Integers [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/cloud_flag_asr contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Cloud flag (probability) from apparent surface reflectance. 0=clear with high confidence; 1=clear with medium confidence; 2=clear with low confidence; 3=cloudy with low confidence; 4=cloudy with medium confidence; 5=cloudy with high confidence; 6=unknown flag_meanings: clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence unknown flag_values: 0, 1, 2, 3, 4, 5, 6 long_name: Cloud Flag ASR source: Atmosphere ATBD units: 1 valid_max: 6 valid_min: 0 |
| /gt3l/sea_ice_segments/stats/exmax_stdev_1: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/exmax_stdev_1 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height standard deviation 1 long_name: Exmax Stdev 1 source: sea ice ATBD Appendix E units: meters |
| /gt3l/sea_ice_segments/stats/fpb_corr_width: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/fpb_corr_width _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: FPB correction width long_name: fpb correction width source: Sea Ice ATBD units: ns |
| /gt3l/sea_ice_segments/stats/height_coarse_stdev: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/height_coarse_stdev contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: height standard deviation of coarse tracker long_name: Coarse Height Sdev source: sea ice ATBD , sect 4.2.1.2 units: meters |
| /gt3l/sea_ice_segments/stats/height_filter_05: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/height_filter_05 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: height fifth percentile used in the ssh height filter long_name: Height Filter 5th Percentile source: sea ice ATBD , sect 4.2.1.2 units: meters |
| /gt3l/sea_ice_segments/stats/n_photons_used: | Array of 16 bit Integers [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/n_photons_used _FillValue: -1 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Number of photons in the trimmed histogram. long_name: Number of photons used for fit source: ATBD, section 4.2.2.4 units: 1 |
| /gt3l/sea_ice_segments/stats/backgr_r_200: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/backgr_r_200 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Background count rate, averaged over the segment based on ATLAS 50 pulse counts long_name: Background rate 200 hz source: ATL09 units: hz |
| /gt3l/sea_ice_segments/stats/hist_photon_top: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/hist_photon_top contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: upper bound of height histogram long_name: height histogram maximum source: ATBD, section 4.2.2.4 units: meters |
| /gt3l/sea_ice_segments/stats/hist_w: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/hist_w _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Segment histogram width estimate long_name: Segment histogram width estimate source: ATBD, section 4.2.2.4 units: meters |
| /gt3l/sea_ice_segments/stats/hist_mean_h: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/hist_mean_h _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Mean of the n_fit_photons heights long_name: photon heights mean source: ATBD, section 4.2.2.4 units: meters |
| /gt3l/sea_ice_segments/stats/height_coarse_mn: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/height_coarse_mn contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: height mean of coarse tracker long_name: Coarse Track Height Mean source: sea ice ATBD , sect 4.2.1.2 units: meters |
| /gt3l/sea_ice_segments/stats/exmax_mean_1: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/exmax_mean_1 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height mean 1 long_name: Exmax Mean 1 source: sea ice ATBD Appendix E units: meters |
| /gt3l/sea_ice_segments/stats/hist_photon_heights: | Array of 16 bit Integers [ = 0..274700][ = 0..220] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/hist_photon_heights contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Histogram of the n_fit_photons heights long_name: photon heights histogram source: ATBD, section 4.2.2.4 units: 1 |
| /gt3l/sea_ice_segments/stats/trim_height_top: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/trim_height_top _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: maximum height of trimmed photons used in the surface calculation procedure long_name: maximum height of trimmed photons source: ATBD, section 4.2.2.4 units: meters |
| /gt3l/sea_ice_segments/stats/exmax_mix: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/exmax_mix _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height mix ratio long_name: Exmax Mix source: sea ice ATBD Appendix E units: meters |
| /gt3l/sea_ice_segments/stats/asr_25: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/asr_25 _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Apparent surface reflectance at 25 hz, averaged to the sea ice segment. long_name: Apparent Surface Reflectance 25hz source: Sea Ice ATBD units: 1 |
| /gt3l/sea_ice_segments/stats/photon_rate: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/photon_rate _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: photon count rate, averaged over segment long_name: photon rate source: ATBD, section 4.2.2.4 units: photons/shot |
| /gt3l/sea_ice_segments/stats/trim_height_bottom: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/trim_height_bottom _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: minimum height of trimmed photons used in the surface calculation procedure long_name: minimum height of trimmed photons source: ATBD, section 4.2.2.4 units: meters |
| /gt3l/sea_ice_segments/stats/n_photons_define: | Array of 16 bit Integers [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/n_photons_define _FillValue: -1 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Number of photons to gather. long_name: Number of photons defining the segment source: ATBD, section 4.2.2.4 units: 1 |
| /gt3l/sea_ice_segments/stats/backgr_r_25: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/stats/backgr_r_25 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Background count rate, averaged over the segment based on 25 hz atmosphere long_name: Background rate 25hz source: ATL09 units: hz |
| /gt3l/sea_ice_segments/geoseg_end: | Array of 32 bit Integers [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geoseg_end contentType: referenceInformation coordinates: delta_time latitude longitude description: Geolocation segment (geoseg) ID associated with the last photon used in this sea ice segment long_name: Ending GEOSEG source: Sea Ice ATBD units: 1 |
| /gt3l/sea_ice_segments/geolocation/rgt: | Array of 16 bit Integers [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geolocation/rgt contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: The reference ground track (RGT) is the track on the earth at which a specified unit vector within the observatory is pointed. Under nominal operating conditions, there will be no data collected along the RGT, as the RGT is spanned by GT3 and GT4. During slews or off-pointing, it is possible that ground tracks may intersect the RGT. The ICESat-2 mission has 1387 RGTs. long_name: Reference Ground track source: Sea Ice ATBD units: 1 valid_max: 1387 valid_min: 1 |
| /gt3l/sea_ice_segments/geolocation/sigma_lon: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geolocation/sigma_lon _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Estimated uncertainty for the reference photon bounce point east longitude: 1- sigma (degrees). Applies to all other photons in the group. long_name: longitude uncertainty source: Sea Ice ATBD units: degrees |
| /gt3l/sea_ice_segments/geolocation/ref_atm_delay: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geolocation/ref_atm_delay _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Atmospheric path delay, in range, for the reference photon. long_name: Reference Photon Atm. Path Delay source: Sea Ice ATBD units: meters |
| /gt3l/sea_ice_segments/geolocation/beam_azimuth: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geolocation/beam_azimuth _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft). When the spacecraft is precisely at the geodetic zenith, the value will be 99999 degrees. long_name: beam azimuth source: Sea Ice ATBD units: degrees_east |
| /gt3l/sea_ice_segments/geolocation/solar_azimuth: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geolocation/solar_azimuth contentType: physicalMeansurement coordinates: ../delta_time ../latitude ../longitude description: The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot. long_name: solar azimuth source: Sea Ice ATBD units: degrees_east |
| /gt3l/sea_ice_segments/geolocation/ref_atm_delay_derivative: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geolocation/ref_atm_delay_derivative _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Atmospheric path delay derivative with respect to ellipsoid for the reference photon, in meters per meter. long_name: Derivative of Atm. Path Delay source: Sea Ice ATBD units: meters/meter |
| /gt3l/sea_ice_segments/geolocation/sigma_lat: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geolocation/sigma_lat _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Estimated uncertainty for the reference photon bounce point geodetic latitude: 1- sigma (degrees). Applies to all other photons in the group long_name: latitude uncertainty source: Sea Ice ATBD units: 1 |
| /gt3l/sea_ice_segments/geolocation/beam_coelev: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geolocation/beam_coelev _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Co-elevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot. long_name: beam co-elevation source: Sea Ice ATBD units: degrees |
| /gt3l/sea_ice_segments/geolocation/sigma_h: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geolocation/sigma_h _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Estimated uncertainty for the reference photon bounce point ellipsoid height: 1- sigma (m). Error estimates for all other photons in the group are computed with the scale defined below. long_name: height uncertainty source: Sea Ice ATBD units: 1 |
| /gt3l/sea_ice_segments/geolocation/solar_elevation: | Array of 32 bit Reals [ = 0..274700] HDF5_OBJ_FULLPATH: /gt3l/sea_ice_segments/geolocation/solar_elevation contentType: physicalMeansurement coordinates: ../delta_time ../latitude ../longitude description: Solar Angle above or below the plane tangent to the ellipsoid surface at the laser spot. Positive values mean the sun is above the horizon, while negative values mean it is below the horizon. The effect of atmospheric refraction is not included. This is a low precision value, with approximately TBD degree accuracy. long_name: solar elevation source: Sea Ice ATBD units: degrees |
| /gt2l/sea_ice_segments/heights/height_segment_fit_quality_flag: | Array of 16 bit Integers [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/heights/height_segment_fit_quality_flag _FillValue: -1 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Flag describing the quality of the results of the along-track fit. (-1=height value is invalid; 1=ngrid_w < wlength/2; 2=ngrid_w >= wlength/2; 3=ngrid_dt < dtlength/2; 4=ngrid_dt >= dtlength/2; 5=ngrid_dt >= (dtlength-2): where 1 is best and 5 is poor). Heights are reported even if this flag indicates the height is invalid. flag_meanings: invalid best high med low poor flag_values: -1, 1, 2, 3, 4, 5 long_name: height Quality Flag source: ATBD, section 4.2.4.2 units: 1 valid_max: 5 valid_min: -1 |
| /gt2l/sea_ice_segments/heights/height_segment_length_seg: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/heights/height_segment_length_seg contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: along-track length of segment containing n_photons_actual long_name: length of segment source: ATBD, section 4.2.2.4 units: meters |
| /gt2l/sea_ice_segments/heights/height_segment_asr_calc: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/heights/height_segment_asr_calc _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Computed apparent surface reflectance for the sea ice segment. long_name: Calculated Apparent Surface Reflectivity source: Sea Ice ATBD units: 1 |
| /gt2l/sea_ice_segments/heights/height_segment_quality: | Array of 16 bit Integers [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/heights/height_segment_quality contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Height segment quality flag, 1 is good quality, 0 is bad depending on fit, wguassian, or layer flag flag_meanings: bad_quality good_quality flag_values: 0, 1 long_name: Height Segment Quality Flag source: ATBD, section 4.2.4 units: 1 valid_max: 1 valid_min: 0 |
| /gt2l/sea_ice_segments/heights/height_segment_n_pulse_seg: | Array of 32 bit Integers [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/heights/height_segment_n_pulse_seg contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: number of laser pulses long_name: number of laser pulses source: ATBD, section 4.2.2.4 units: 1 |
| /gt2l/sea_ice_segments/heights/across_track_distance: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/heights/across_track_distance contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Across track distance of photons averaged over the sea ice height segment. long_name: Across Track Distance source: ATBD, section 4.2.4 units: meters |
| /gt2l/sea_ice_segments/heights/height_segment_htcorr_skew: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/heights/height_segment_htcorr_skew _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: height corection for skew long_name: Height Correction for Skew source: ATBD, section 4.2.6 units: meters |
| /gt2l/sea_ice_segments/heights/height_segment_ssh_flag: | Array of 16 bit Integers [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/heights/height_segment_ssh_flag contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Identifies the height segments that are candidates for use as sea surface reference in freeboard calculations in ATL10. 0 = sea ice; 1 = sea surface flag_meanings: sea_ice sea_surface flag_values: 0, 1 long_name: Sea Surface Flag source: ATBD, section 4.3 units: 1 valid_max: 1 valid_min: 0 |
| /gt2l/sea_ice_segments/heights/height_segment_height: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/heights/height_segment_height coordinates: ../delta_time ../latitude ../longitude description: Mean height from along-track segment fit detremined by the sea ice algorithm long_name: height of segment surface source: ATBD, section 4.2.2.4 units: meters _FillValue: 3.402823466e+38 contentType: referenceInformation |
| /gt2l/sea_ice_segments/heights/height_segment_type: | Array of 16 bit Integers [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/heights/height_segment_type contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Value that indicates segment surface type as sea ice or different types of sea surface. 0=cloud covered: rsurf flag_meanings: cloud_covered other specular_lead_low_w_bkg specular_lead_low specular_lead_high_w_bkg specular_lead_high dark_lead_smooth_w_bkg dark_lead_smooth dark_lead_rough_w_bkg dark_lead_rough flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 long_name: Segment surface type source: ATBD, section 4.3 units: 1 valid_max: 9 valid_min: 0 |
| /gt2l/sea_ice_segments/heights/height_segment_confidence: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/heights/height_segment_confidence _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Confidence level in the surface height estimate based on the number of photons; the background noise rate; and the error analysis long_name: Surface height confidence source: ATBD, section 4.2.4.2 units: 1 |
| /gt2l/sea_ice_segments/heights/height_segment_surface_error_est: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/heights/height_segment_surface_error_est _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Error estimate of the surface height long_name: h surface error est source: ATBD, section 4.2.2.4 units: meters |
| /gt2l/sea_ice_segments/heights/height_segment_w_gaussian: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/heights/height_segment_w_gaussian _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: width of best fit gaussian long_name: width of best fit gaussian source: ATBD, section 4.2.4 units: meters |
| /gt2l/sea_ice_segments/heights/height_segment_rms: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/heights/height_segment_rms _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: RMS difference between sea ice modeled and observed photon height distribution long_name: height rms source: ATBD, section 4.2.2.4 units: meters |
| /gt2l/sea_ice_segments/height_segment_id: | Array of 32 bit Integers [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/height_segment_id contentType: referenceInformation coordinates: delta_time latitude longitude description: Identifier of each height segment long_name: Identifier of each height segment source: ATBD, section 5.2 units: 1 |
| /gt2l/sea_ice_segments/seg_dist_x: | Array of 64 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/seg_dist_x contentType: referenceInformation coordinates: delta_time latitude longitude description: Along-track distance from the equator crossing to the segment center. long_name: Along track distance source: Sea Ice ATBD units: meters |
| /gt2l/sea_ice_segments/longitude: | Array of 64 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/longitude contentType: referenceInformation coordinates: delta_time latitude description: Longitude, WGS84, East=+,Lon of segment center long_name: Longitude source: ATBD, section 4.4 standard_name: longitude units: degrees_east valid_max: 180. valid_min: -180. |
| /gt2l/sea_ice_segments/latitude: | Array of 64 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/latitude contentType: referenceInformation coordinates: delta_time longitude description: Latitude, WGS84, North=+, Lat of segment center long_name: Latitude source: ATBD, section 4.4 standard_name: latitude units: degrees_north valid_max: 90. valid_min: -90. |
| /gt2l/sea_ice_segments/geophysical/height_segment_t2m: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geophysical/height_segment_t2m _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Temperature at 2m above the displacement height (K) long_name: temperature_at_2m source: ATL09 standard_name: temperature units: K |
| /gt2l/sea_ice_segments/geophysical/height_segment_dac: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geophysical/height_segment_dac _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect. long_name: Dynamic Atmosphere Correction source: Sea Ice ATBD units: meters |
| /gt2l/sea_ice_segments/geophysical/height_segment_ps: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geophysical/height_segment_ps _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Sea Level Pressure (Pa) long_name: sea level pressure source: ATL09 standard_name: pressure units: Pa |
| /gt2l/sea_ice_segments/geophysical/height_segment_ib: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geophysical/height_segment_ib _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Inverted barometer effect calculated from surface pressure long_name: Inverted barometer effect source: ATBD, section 4.2 units: meters |
| /gt2l/sea_ice_segments/geophysical/height_segment_load: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geophysical/height_segment_load _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm). long_name: Load Tide source: Sea Ice ATBD units: meters |
| /gt2l/sea_ice_segments/geophysical/height_segment_geoid: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geophysical/height_segment_geoid _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Geoid height above WGS-84 reference ellipsoid (range -107 to 86m), based on the EGM2008 model. long_name: EGM2008 Geoid source: Sea Ice ATBD units: meters |
| /gt2l/sea_ice_segments/geophysical/height_segment_ocean: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geophysical/height_segment_ocean _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium) long_name: Ocean Tide source: Sea Ice ATBD units: meters |
| /gt2l/sea_ice_segments/geophysical/height_segment_v2m: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geophysical/height_segment_v2m _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Northward wind at 2m above the displacement height (m/s-1) long_name: Northward_wind_at_2m source: ATL09 standard_name: northward_wind units: m s-1 |
| /gt2l/sea_ice_segments/geophysical/height_segment_mss: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geophysical/height_segment_mss _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Mean sea surface height above WGS-84 reference ellipsoid (range: -105 to 87m), based on the DTU13 model. long_name: DTU13 Mean Sea Surface source: Sea Ice ATBD units: meters |
| /gt2l/sea_ice_segments/geophysical/height_segment_u2m: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geophysical/height_segment_u2m _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Eastward wind at 2m above the displacement height (m/s-1) long_name: Eastward_wind_at_2m source: ATL09 standard_name: eastward_wind units: m s-1 |
| /gt2l/sea_ice_segments/geophysical/height_segment_lpe: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geophysical/height_segment_lpe _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Long period equilibrium tide self-consistent with ocean tide model (+-0.04m). (dependent only on time and latitude) long_name: Equilibrium Tide source: Sea Ice ATBD units: meters |
| /gt2l/sea_ice_segments/geophysical/height_segment_earth: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geophysical/height_segment_earth _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Solid Earth Tide long_name: Earth Tide source: Sea Ice ATBD units: meters |
| /gt2l/sea_ice_segments/geophysical/height_segment_pole: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geophysical/height_segment_pole coordinates: ../delta_time ../latitude ../longitude description: Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm). long_name: Pole Tide source: Sea Ice ATBD units: meters _FillValue: 3.402823466e+38 contentType: referenceInformation |
| /gt2l/sea_ice_segments/geoseg_beg: | Array of 32 bit Integers [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geoseg_beg contentType: referenceInformation coordinates: delta_time latitude longitude description: Geolocation segment (geoseg) ID associated with the first photon used in this sea ice segment long_name: Beginning GEOSEG source: Sea Ice ATBD units: 1 |
| /gt2l/sea_ice_segments/delta_time: | Array of 64 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/delta_time contentType: physicalMeasurement coordinates: latitude longitude description: Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name: Elapsed GPS seconds source: telemetry standard_name: time units: seconds since 2018-01-01 CLASS: DIMENSION_SCALE NAME: gt2l/sea_ice_segments/delta_time |
| /gt2l/sea_ice_segments/stats/msw_flag: | Array of 16 bit Integers [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/msw_flag contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Multiple Scattering warning flag. The multiple scattering warning flag (ATL09 parameter msw_flag) has values from -1 to 5 where zero means no multiple scattering and 5 the greatest. If no layers were detected, then msw_flag = 0. If blowing snow is detected and its estimated optical depth is greater than or equal to 0.5, then msw_flag = 5. If the blowing snow optical depth is less than 0.5, then msw_flag = 4. If no blowing snow is detected but there are cloud or aerosol layers detected, the msw_flag assumes values of 1 to 3 based on the height of the bottom of the lowest layer: < 1 km, msw_flag = 3; 1-3 km, msw_flag = 2; > 3km, msw_flag = 1. A value of -1 indicates that the signal to noise of the data was too low to reliably ascertain the presence of cloud or blowing snow. We expect values of -1 to occur only during daylight. flag_meanings: cannot_determine no_layers layer_gt_3km layer_between_1_and_3_km layer_lt_1km blow_snow_od_lt_0.5 blow_snow_od_gt_0.5 flag_values: -1, 0, 1, 2, 3, 4, 5 long_name: Multiple Scattering Warning Flag source: Atmosphere ATBD units: 1 valid_max: 5 valid_min: -1 |
| /gt2l/sea_ice_segments/stats/hist_median_h: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/hist_median_h _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Median of the n_fit_photons heights long_name: trimmed photon heights median source: ATBD, section 4.2.3.1 units: meters |
| /gt2l/sea_ice_segments/stats/height_filter_min: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/height_filter_min _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: height minimum used in the ssh height filter long_name: Height Filter Min source: sea ice ATBD , sect 4.2.1.2 units: meters |
| /gt2l/sea_ice_segments/stats/cloud_flag_atm: | Array of 16 bit Integers [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/cloud_flag_atm contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Number of layers found from the backscatter profile using the DDA layer finder. long_name: Cloud Flag Atm source: Atmosphere ATBD units: 1 valid_max: 10 valid_min: 0 |
| /gt2l/sea_ice_segments/stats/fpb_avg_dt: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/fpb_avg_dt _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: FPB correction average dead time long_name: fpb correction average deadtime source: Sea Ice ATBD units: ns |
| /gt2l/sea_ice_segments/stats/ds_si_hist_bins: | Array of 32 bit Integers [ = 0..220] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/ds_si_hist_bins CLASS: DIMENSION_SCALE NAME: ds_si_hist_bins contentType: auxiliaryInformation description: Dimension scale indexing the sea ice histogram bins. The bin heights must be computed from information contained within the same group as the histogram. long_name: Sea Ice Histogram Bins Dimension Scale source: SeaIce ATBD units: 1 |
| /gt2l/sea_ice_segments/stats/fpb_strength: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/fpb_strength _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: FPB correction strength long_name: fpb correction strength source: Sea Ice ATBD units: photons/shot |
| /gt2l/sea_ice_segments/stats/bsnow_con: | Array of 16 bit Integers [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/bsnow_con _FillValue: 127 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Blowing snow confidence long_name: Blowing snow confidence source: ATL09 units: 1 |
| /gt2l/sea_ice_segments/stats/layer_flag: | Array of 16 bit Integers [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/layer_flag contentType: qualityInformation coordinates: ../delta_time ../latitude ../longitude description: This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow. flag_meanings: likely_clear likely_cloudy flag_values: 0, 1 long_name: Consolidated cloud flag source: Atmosphere ATBD units: 1 valid_max: 1 valid_min: 0 |
| /gt2l/sea_ice_segments/stats/hist_photon_bin_size: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/hist_photon_bin_size contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: bin size of photon height histogram long_name: height histogram bin size source: ATBD, section 4.2.2.4 units: meters |
| /gt2l/sea_ice_segments/stats/backgr_calc: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/backgr_calc _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Calculated background count rate based on sun angle, surface slope, unit reflectance long_name: background count rate calculated source: ATBD, section 4.2.3 units: hz |
| /gt2l/sea_ice_segments/stats/fpb_corr: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/fpb_corr _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Estimated first-photon bias(fpb) correction to mean segment height long_name: first photon bias correction source: Sea Ice ATBD units: meters |
| /gt2l/sea_ice_segments/stats/bsnow_h: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/bsnow_h _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Blowing snow layer top height long_name: Blowing snow top h source: ATL09 units: meters |
| /gt2l/sea_ice_segments/stats/hist_photon_bottom: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/hist_photon_bottom contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: lower bound of height histogram long_name: height histogram minimum source: ATBD, section 4.2.2.4 units: meters |
| /gt2l/sea_ice_segments/stats/background_r_norm: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/background_r_norm _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Background rate normalized to a fixed solar elevation angle long_name: Normalized background (50-shot) source: ATBD section 4.3.1.3 units: hz |
| /gt2l/sea_ice_segments/stats/exmax_mean_2: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/exmax_mean_2 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height mean 2 long_name: Exmax Mean 2 source: sea ice ATBD Appendix E units: meters |
| /gt2l/sea_ice_segments/stats/background_int_height: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/background_int_height _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: The height of the altimetric range window after subtracting the height span of the signal photon events in the 50-shot span long_name: Height of column used in background calculation source: ATBD, section 7.3 units: meters |
| /gt2l/sea_ice_segments/stats/n_photons_actual: | Array of 16 bit Integers [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/n_photons_actual _FillValue: -1 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Number of photons gathered long_name: Number of photons found for the segment source: ATBD, section 4.2.2.4 units: 1 |
| /gt2l/sea_ice_segments/stats/ice_conc: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/ice_conc contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: sea ice concentration long_name: sea ice concentration source: ATBD, section 3.1.4 units: 1 |
| /gt2l/sea_ice_segments/stats/exmax_stdev_2: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/exmax_stdev_2 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height standard deviation 2 long_name: Exmax Stdev 2 source: sea ice ATBD Appendix E units: meters |
| /gt2l/sea_ice_segments/stats/cloud_flag_asr: | Array of 16 bit Integers [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/cloud_flag_asr contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Cloud flag (probability) from apparent surface reflectance. 0=clear with high confidence; 1=clear with medium confidence; 2=clear with low confidence; 3=cloudy with low confidence; 4=cloudy with medium confidence; 5=cloudy with high confidence; 6=unknown flag_meanings: clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence unknown flag_values: 0, 1, 2, 3, 4, 5, 6 long_name: Cloud Flag ASR source: Atmosphere ATBD units: 1 valid_max: 6 valid_min: 0 |
| /gt2l/sea_ice_segments/stats/exmax_stdev_1: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/exmax_stdev_1 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height standard deviation 1 long_name: Exmax Stdev 1 source: sea ice ATBD Appendix E units: meters |
| /gt2l/sea_ice_segments/stats/fpb_corr_width: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/fpb_corr_width _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: FPB correction width long_name: fpb correction width source: Sea Ice ATBD units: ns |
| /gt2l/sea_ice_segments/stats/height_coarse_stdev: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/height_coarse_stdev contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: height standard deviation of coarse tracker long_name: Coarse Height Sdev source: sea ice ATBD , sect 4.2.1.2 units: meters |
| /gt2l/sea_ice_segments/stats/height_filter_05: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/height_filter_05 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: height fifth percentile used in the ssh height filter long_name: Height Filter 5th Percentile source: sea ice ATBD , sect 4.2.1.2 units: meters |
| /gt2l/sea_ice_segments/stats/n_photons_used: | Array of 16 bit Integers [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/n_photons_used _FillValue: -1 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Number of photons in the trimmed histogram. long_name: Number of photons used for fit source: ATBD, section 4.2.2.4 units: 1 |
| /gt2l/sea_ice_segments/stats/backgr_r_200: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/backgr_r_200 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Background count rate, averaged over the segment based on ATLAS 50 pulse counts long_name: Background rate 200 hz source: ATL09 units: hz |
| /gt2l/sea_ice_segments/stats/hist_photon_top: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/hist_photon_top contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: upper bound of height histogram long_name: height histogram maximum source: ATBD, section 4.2.2.4 units: meters |
| /gt2l/sea_ice_segments/stats/hist_w: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/hist_w _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Segment histogram width estimate long_name: Segment histogram width estimate source: ATBD, section 4.2.2.4 units: meters |
| /gt2l/sea_ice_segments/stats/hist_mean_h: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/hist_mean_h _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Mean of the n_fit_photons heights long_name: photon heights mean source: ATBD, section 4.2.2.4 units: meters |
| /gt2l/sea_ice_segments/stats/height_coarse_mn: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/height_coarse_mn contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: height mean of coarse tracker long_name: Coarse Track Height Mean source: sea ice ATBD , sect 4.2.1.2 units: meters |
| /gt2l/sea_ice_segments/stats/exmax_mean_1: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/exmax_mean_1 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height mean 1 long_name: Exmax Mean 1 source: sea ice ATBD Appendix E units: meters |
| /gt2l/sea_ice_segments/stats/hist_photon_heights: | Array of 16 bit Integers [ = 0..221424][ = 0..220] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/hist_photon_heights contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Histogram of the n_fit_photons heights long_name: photon heights histogram source: ATBD, section 4.2.2.4 units: 1 |
| /gt2l/sea_ice_segments/stats/trim_height_top: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/trim_height_top _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: maximum height of trimmed photons used in the surface calculation procedure long_name: maximum height of trimmed photons source: ATBD, section 4.2.2.4 units: meters |
| /gt2l/sea_ice_segments/stats/exmax_mix: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/exmax_mix _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height mix ratio long_name: Exmax Mix source: sea ice ATBD Appendix E units: meters |
| /gt2l/sea_ice_segments/stats/asr_25: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/asr_25 _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Apparent surface reflectance at 25 hz, averaged to the sea ice segment. long_name: Apparent Surface Reflectance 25hz source: Sea Ice ATBD units: 1 |
| /gt2l/sea_ice_segments/stats/photon_rate: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/photon_rate _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: photon count rate, averaged over segment long_name: photon rate source: ATBD, section 4.2.2.4 units: photons/shot |
| /gt2l/sea_ice_segments/stats/trim_height_bottom: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/trim_height_bottom _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: minimum height of trimmed photons used in the surface calculation procedure long_name: minimum height of trimmed photons source: ATBD, section 4.2.2.4 units: meters |
| /gt2l/sea_ice_segments/stats/n_photons_define: | Array of 16 bit Integers [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/n_photons_define _FillValue: -1 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Number of photons to gather. long_name: Number of photons defining the segment source: ATBD, section 4.2.2.4 units: 1 |
| /gt2l/sea_ice_segments/stats/backgr_r_25: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/stats/backgr_r_25 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Background count rate, averaged over the segment based on 25 hz atmosphere long_name: Background rate 25hz source: ATL09 units: hz |
| /gt2l/sea_ice_segments/geoseg_end: | Array of 32 bit Integers [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geoseg_end contentType: referenceInformation coordinates: delta_time latitude longitude description: Geolocation segment (geoseg) ID associated with the last photon used in this sea ice segment long_name: Ending GEOSEG source: Sea Ice ATBD units: 1 |
| /gt2l/sea_ice_segments/geolocation/rgt: | Array of 16 bit Integers [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geolocation/rgt contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: The reference ground track (RGT) is the track on the earth at which a specified unit vector within the observatory is pointed. Under nominal operating conditions, there will be no data collected along the RGT, as the RGT is spanned by GT3 and GT4. During slews or off-pointing, it is possible that ground tracks may intersect the RGT. The ICESat-2 mission has 1387 RGTs. long_name: Reference Ground track source: Sea Ice ATBD units: 1 valid_max: 1387 valid_min: 1 |
| /gt2l/sea_ice_segments/geolocation/sigma_lon: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geolocation/sigma_lon _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Estimated uncertainty for the reference photon bounce point east longitude: 1- sigma (degrees). Applies to all other photons in the group. long_name: longitude uncertainty source: Sea Ice ATBD units: degrees |
| /gt2l/sea_ice_segments/geolocation/ref_atm_delay: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geolocation/ref_atm_delay _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Atmospheric path delay, in range, for the reference photon. long_name: Reference Photon Atm. Path Delay source: Sea Ice ATBD units: meters |
| /gt2l/sea_ice_segments/geolocation/beam_azimuth: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geolocation/beam_azimuth _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft). When the spacecraft is precisely at the geodetic zenith, the value will be 99999 degrees. long_name: beam azimuth source: Sea Ice ATBD units: degrees_east |
| /gt2l/sea_ice_segments/geolocation/solar_azimuth: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geolocation/solar_azimuth contentType: physicalMeansurement coordinates: ../delta_time ../latitude ../longitude description: The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot. long_name: solar azimuth source: Sea Ice ATBD units: degrees_east |
| /gt2l/sea_ice_segments/geolocation/ref_atm_delay_derivative: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geolocation/ref_atm_delay_derivative _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Atmospheric path delay derivative with respect to ellipsoid for the reference photon, in meters per meter. long_name: Derivative of Atm. Path Delay source: Sea Ice ATBD units: meters/meter |
| /gt2l/sea_ice_segments/geolocation/sigma_lat: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geolocation/sigma_lat _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Estimated uncertainty for the reference photon bounce point geodetic latitude: 1- sigma (degrees). Applies to all other photons in the group long_name: latitude uncertainty source: Sea Ice ATBD units: 1 |
| /gt2l/sea_ice_segments/geolocation/beam_coelev: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geolocation/beam_coelev _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Co-elevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot. long_name: beam co-elevation source: Sea Ice ATBD units: degrees |
| /gt2l/sea_ice_segments/geolocation/sigma_h: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geolocation/sigma_h _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Estimated uncertainty for the reference photon bounce point ellipsoid height: 1- sigma (m). Error estimates for all other photons in the group are computed with the scale defined below. long_name: height uncertainty source: Sea Ice ATBD units: 1 |
| /gt2l/sea_ice_segments/geolocation/solar_elevation: | Array of 32 bit Reals [ = 0..221424] HDF5_OBJ_FULLPATH: /gt2l/sea_ice_segments/geolocation/solar_elevation contentType: physicalMeansurement coordinates: ../delta_time ../latitude ../longitude description: Solar Angle above or below the plane tangent to the ellipsoid surface at the laser spot. Positive values mean the sun is above the horizon, while negative values mean it is below the horizon. The effect of atmospheric refraction is not included. This is a low precision value, with approximately TBD degree accuracy. long_name: solar elevation source: Sea Ice ATBD units: degrees |
| /ancillary_data/release: | Array of Strings [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/release contentType: auxiliaryInformation description: Release number of the granule. The release number is incremented when the software or ancillary data used to create the granule has been changed. long_name: Release Number source: Operations units: 1 |
| /ancillary_data/end_geoseg: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/end_geoseg contentType: auxiliaryInformation description: The ending geolocation segment number associated with the data contained within this granule. ICESat granule geographic regions are further refined by geolocation segments. During the geolocation process, a geolocation segment is created approximately every 20m from the start of the orbit to the end. The geolocation segments help align the ATLAS strong a weak beams and provide a common segment length for the L2 and higher products. The geolocation segment indices differ slightly from orbit-to-orbit because of the irregular shape of the Earth. The geolocation segment indices on ATL01 and ATL02 are only approximate because beams have not been aligned at the time of their creation. long_name: Ending Geolocation Segment source: Derived units: 1 |
| /ancillary_data/version: | Array of Strings [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/version contentType: auxiliaryInformation description: Version number of this granule within the release. It is a sequential number corresponding to the number of times the granule has been reprocessed for the current release. long_name: Version source: Operations units: 1 |
| /ancillary_data/end_region: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/end_region contentType: auxiliaryInformation description: The ending product-specific region number associated with the data contained within this granule. ICESat-2 data products are separated by geographic regions. The data contained within a specific region are the same for ATL01 and ATL02. ATL03 regions differ slightly because of different geolocation segment locations caused by the irregular shape of the Earth. The region indices for other products are completely independent. long_name: Ending Region source: Derived units: 1 |
| /ancillary_data/atlas_sdp_gps_epoch: | Array of 64 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/atlas_sdp_gps_epoch contentType: auxiliaryInformation description: Number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS Standard Data Product (SDP) epoch (2018-01-01:T00.00.00.000000 UTC). Add this value to delta time parameters to compute full gps_seconds (relative to the GPS epoch) for each data point. long_name: ATLAS Epoch Offset source: Operations units: seconds since 1980-01-06T00:00:00.000000Z |
| /ancillary_data/end_rgt: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/end_rgt contentType: auxiliaryInformation description: The ending reference groundtrack (RGT) number associated with the data contained within this granule. There are 1387 reference groundtrack in the ICESat-2 repeat orbit. The reference groundtrack increments each time the spacecraft completes a full orbit of the Earth and resets to 1 each time the spacecraft completes a full cycle. long_name: Ending Reference Groundtrack source: Derived units: 1 valid_max: 1387 valid_min: 1 |
| /ancillary_data/end_delta_time: | Array of 64 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/end_delta_time contentType: auxiliaryInformation description: Number of GPS seconds since the ATLAS SDP epoch at the last data point in the file. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name: ATLAS End Time (Actual) source: Derived standard_name: time units: seconds since 2018-01-01 |
| /ancillary_data/end_orbit: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/end_orbit contentType: auxiliaryInformation description: The ending orbit number associated with the data contained within this granule. The orbit number increments each time the spacecraft completes a full orbit of the Earth. long_name: Ending Orbit Number source: Derived units: 1 |
| /ancillary_data/start_cycle: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/start_cycle contentType: auxiliaryInformation description: The starting cycle number associated with the data contained within this granule. The cycle number is the counter of the number of 91-day repeat cycles completed by the mission. long_name: Starting Cycle source: Derived units: 1 valid_max: 99 valid_min: 0 |
| /ancillary_data/data_end_utc: | Array of Strings [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/data_end_utc contentType: auxiliaryInformation source: Derived description: UTC (in CCSDS-A format) of the last data point within the granule. long_name: End UTC Time of Granule (CCSDS-A, Actual) units: 1 |
| /ancillary_data/control: | Array of Strings [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/control contentType: auxiliaryInformation units: 1 description: PGE-specific control file used to generate this granule. To re-use, replace breaks (BR) with linefeeds. long_name: Control File source: Operations |
| /ancillary_data/start_gpssow: | Array of 64 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/start_gpssow contentType: auxiliaryInformation description: GPS seconds-of-week of the first data point in the granule. long_name: Start GPS SOW of Granule (Actual) source: Derived units: seconds |
| /ancillary_data/granule_end_utc: | Array of Strings [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/granule_end_utc contentType: auxiliaryInformation description: Requested end time (in UTC CCSDS-A) of this granule. long_name: End UTC Time of Granule (CCSDS-A, Requested) source: Derived units: 1 |
| /ancillary_data/fine_surface_finding/tep_used_gt1_strong: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/tep_used_gt1_strong contentType: auxiliaryInformation description: TEP used in table generation for strong beam of ground track 1 (1 or 3) long_name: TEP Table PCE1_Strong source: Sea Ice ATBD units: 1 |
| /ancillary_data/fine_surface_finding/h_diff_limit: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/h_diff_limit contentType: auxiliaryInformation description: Maximum height difference between the two weighted Gaussian mean from the initial tracked height (units = meters) long_name: Max Ht Difference source: Sea Ice ATBD units: meters |
| /ancillary_data/fine_surface_finding/n_specular: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/n_specular contentType: auxiliaryInformation description: Specular returns limits long_name: number photons Specular returns source: Sea Ice ATBD units: 1 |
| /ancillary_data/fine_surface_finding/tep_used_gt3_strong: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/tep_used_gt3_strong contentType: auxiliaryInformation description: TEP used in table generation for strong beam of ground track 3 (1 or 3) long_name: TEP Table PCE3_Strong source: Sea Ice ATBD units: 1 |
| /ancillary_data/fine_surface_finding/n_spec_scale: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/n_spec_scale contentType: auxiliaryInformation description: Scalling parameter used for scaling value of N_SPECULAR for the weak beam. Specular returns for weak beam are defined as a shot having more photons than (N_SPECULAR/N_SPEC_SCALE) long_name: Specular Scaling Value source: Sea Ice ATBD units: 1 |
| /ancillary_data/fine_surface_finding/ub_length_strong: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/ub_length_strong contentType: auxiliaryInformation description: upper bound of segment length strong beam long_name: upper bound segment length strong source: Sea Ice ATBD units: 1 |
| /ancillary_data/fine_surface_finding/ub_oc_switch_weak: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/ub_oc_switch_weak contentType: auxiliaryInformation description: Upper bound of photon rate overlapping control for weak beam when overlap is turned off long_name: Upper bound of overlapping control for weak beam source: ATBD section 4.2.2.4 units: photons/shot |
| /ancillary_data/fine_surface_finding/bin_f: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/bin_f contentType: auxiliaryInformation description: bin size of fine histogram along track segment length long_name: bin size of fine histogram source: Sea Ice ATBD units: meters |
| /ancillary_data/fine_surface_finding/lb_oc_switch_strong: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/lb_oc_switch_strong contentType: auxiliaryInformation units: photons/shot description: Lower bound of photon rate overlapping control for strong beam when overlap is turned off long_name: Lower bound of overlapping control for strong beam source: ATBD section 4.2.2.4 |
| /ancillary_data/fine_surface_finding/lb_oc_switch_weak: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/lb_oc_switch_weak contentType: auxiliaryInformation units: photons/shot description: Lower bound of photon rate overlapping control for weak beam when overlap is turned off long_name: Lower bound of overlapping control for weak beam source: ATBD section 4.2.2.4 |
| /ancillary_data/fine_surface_finding/tep_used_gt2_strong: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/tep_used_gt2_strong contentType: auxiliaryInformation description: TEP used in table generation for strong beam of ground track 2 (1 or 3) long_name: TEP Table PCE2_Strong source: Sea Ice ATBD units: 1 |
| /ancillary_data/fine_surface_finding/n_photon_min: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/n_photon_min contentType: auxiliaryInformation description: Minimum fraction of photons needed for tracking long_name: Minimum number of photons source: Sea Ice ATBD units: 1 |
| /ancillary_data/fine_surface_finding/n_w: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/n_w contentType: auxiliaryInformation description: number of standard deviations long_name: number of standard deviations source: Sea Ice ATBD units: 1 |
| /ancillary_data/fine_surface_finding/tep_used_gt3_weak: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/tep_used_gt3_weak contentType: auxiliaryInformation description: TEP used in table generation for weak beam of ground track 3 (1 or 3) long_name: TEP Table PCE3_Weak source: Sea Ice ATBD units: 1 |
| /ancillary_data/fine_surface_finding/delta_h_tab: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/delta_h_tab contentType: auxiliaryInformation description: the waveform table spacing for the height (h) dimension long_name: h table spacing source: Sea Ice ATBD units: meters |
| /ancillary_data/fine_surface_finding/overlap_switch: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/overlap_switch contentType: auxiliaryInformation description: Use of overlapping height segments (1 = yes, 0 = no) flag_meanings: no yes flag_values: 0, 1 long_name: Overlap Segments source: Sea Ice ATBD units: 1 valid_max: 1 valid_min: 0 |
| /ancillary_data/fine_surface_finding/lb_win_s: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/lb_win_s contentType: auxiliaryInformation source: Sea Ice ATBD description: window (Ws) containing signal photons long_name: lower bound window signal units: meters |
| /ancillary_data/fine_surface_finding/tep_used_gt2_weak: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/tep_used_gt2_weak contentType: auxiliaryInformation description: TEP used in table generation for weak beam of ground track 2 (1 or 3) long_name: TEP Table PCE2_Weak source: Sea Ice ATBD units: 1 |
| /ancillary_data/fine_surface_finding/tep_used_gt1_weak: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/tep_used_gt1_weak contentType: auxiliaryInformation description: TEP used in table generation for weak beam of ground track 1 (1 or 3) long_name: TEP Table PCE1_Weak source: Sea Ice ATBD units: 1 |
| /ancillary_data/fine_surface_finding/n_s: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/n_s contentType: auxiliaryInformation description: photons in W_s long_name: number photons in W_s source: Sea Ice ATBD units: 1 |
| /ancillary_data/fine_surface_finding/ub_win_s: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/ub_win_s contentType: auxiliaryInformation description: window (Ws) containing signal photons long_name: upper bound window signal source: Sea Ice ATBD units: meters |
| /ancillary_data/fine_surface_finding/ub_length_weak: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/ub_length_weak contentType: auxiliaryInformation description: upper bound of segment length weak beam long_name: upper bound segment length weak source: Sea Ice ATBD units: 1 |
| /ancillary_data/fine_surface_finding/ub_h_tab: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/ub_h_tab contentType: auxiliaryInformation description: the waveform upper bound for the height (h) dimension long_name: upper bound of h table source: Sea Ice ATBD units: meters |
| /ancillary_data/fine_surface_finding/ub_oc_switch_strong: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/ub_oc_switch_strong contentType: auxiliaryInformation description: Upper bound of photon rate overlapping control for strong beam when overlap is turned off long_name: Upper bound of overlapping control for strong beam source: ATBD section 4.2.2.4 units: photons/shot |
| /ancillary_data/fine_surface_finding/ub_w_tab: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/ub_w_tab contentType: auxiliaryInformation description: the waveform upper bound for the width (w) dimension long_name: upper bound of w table source: Sea Ice ATBD units: meters |
| /ancillary_data/fine_surface_finding/n_photon_trim: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/n_photon_trim contentType: auxiliaryInformation description: Minimum number of photons for trimming leading/trailing bins long_name: Min Photons source: Sea Ice ATBD units: 1 |
| /ancillary_data/fine_surface_finding/delta_w_tab: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/delta_w_tab contentType: auxiliaryInformation description: the waveform table spacing for the width (w) dimension long_name: w table spacing source: Sea Ice ATBD units: meters |
| /ancillary_data/fine_surface_finding/lb_w_tab: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/lb_w_tab contentType: auxiliaryInformation description: lower bound of w table long_name: lower bound of w table source: Sea Ice ATBD units: meters |
| /ancillary_data/fine_surface_finding/lb_h_tab: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/fine_surface_finding/lb_h_tab contentType: auxiliaryInformation description: lower bound of h table long_name: lower bound of h table source: Sea Ice ATBD units: meters |
| /ancillary_data/end_cycle: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/end_cycle contentType: auxiliaryInformation long_name: Ending Cycle description: The ending cycle number associated with the data contained within this granule. The cycle number is the counter of the number of 91-day repeat cycles completed by the mission. source: Derived units: 1 valid_max: 99 valid_min: 0 |
| /ancillary_data/sea_ice/min_segs_count: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/sea_ice/min_segs_count contentType: auxiliaryInformation description: ATL07 granules with less than this number of strong beam sea ice segments will be marked as failed. long_name: Minimum Segments Count source: Sea Ice ATBD units: 1 |
| /ancillary_data/sea_ice/proc_beam_pair1: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/sea_ice/proc_beam_pair1 contentType: auxiliaryInformation description: Indicates if beam pair 1 was processed. flag_meanings: not_processed processed flag_values: 0, 1 long_name: Processing Flag for Beam Pair 1 source: Operations units: 1 valid_max: 1 valid_min: 0 |
| /ancillary_data/sea_ice/proc_beam_pair3: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/sea_ice/proc_beam_pair3 contentType: auxiliaryInformation description: Indicates if beam pair 3 was processed. flag_meanings: not_processed processed flag_values: 0, 1 long_name: Processing Flag for Beam Pair 3 source: Operations units: 1 valid_max: 1 valid_min: 0 |
| /ancillary_data/sea_ice/geoseg_min: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/sea_ice/geoseg_min contentType: auxiliaryInformation description: Indicates the minimum segment_id to process (if specified in control) long_name: Minimum Segment ID source: Operations units: 1 |
| /ancillary_data/sea_ice/proc_interval: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/sea_ice/proc_interval contentType: auxiliaryInformation description: The number of 20 meter segments of data processed in one chunk long_name: Processing interval source: Operations units: 1 |
| /ancillary_data/sea_ice/proc_beam_pair2: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/sea_ice/proc_beam_pair2 contentType: auxiliaryInformation description: Indicates if beam pair 2 was processed. flag_meanings: not_processed processed flag_values: 0, 1 long_name: Processing Flag for Beam Pair 2 source: Operations units: 1 valid_max: 1 valid_min: 0 |
| /ancillary_data/sea_ice/geoseg_max: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/sea_ice/geoseg_max contentType: auxiliaryInformation description: Indicates the maximum segment_id to process (if specified in control). The actual maximum processed may be greater than specified. long_name: Maximum Segment Id source: Operations units: 1 |
| /ancillary_data/sea_ice/region: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/sea_ice/region contentType: auxiliaryInformation description: The index to the geographic region covered within this granule (0=no region boundaries enforced). long_name: Region Index source: Operations units: 1 |
| /ancillary_data/granule_start_utc: | Array of Strings [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/granule_start_utc contentType: auxiliaryInformation description: Requested start time (in UTC CCSDS-A) of this granule. long_name: Start UTC Time of Granule (CCSDS-A, Requested) source: Derived units: 1 |
| /ancillary_data/start_delta_time: | Array of 64 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/start_delta_time contentType: auxiliaryInformation description: Number of GPS seconds since the ATLAS SDP epoch at the first data point in the file. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name: ATLAS Start Time (Actual) source: Derived standard_name: time units: seconds since 2018-01-01 |
| /ancillary_data/start_geoseg: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/start_geoseg contentType: auxiliaryInformation description: The starting geolocation segment number associated with the data contained within this granule. ICESat granule geographic regions are further refined by geolocation segments. During the geolocation process, a geolocation segment is created approximately every 20m from the start of the orbit to the end. The geolocation segments help align the ATLAS strong a weak beams and provide a common segment length for the L2 and higher products. The geolocation segment indices differ slightly from orbit-to-orbit because of the irregular shape of the Earth. The geolocation segment indices on ATL01 and ATL02 are only approximate because beams have not been aligned at the time of their creation. long_name: Starting Geolocation Segment source: Derived units: 1 |
| /ancillary_data/start_orbit: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/start_orbit contentType: auxiliaryInformation description: The starting orbit number associated with the data contained within this granule. The orbit number increments each time the spacecraft completes a full orbit of the Earth. long_name: Starting Orbit Number source: Derived units: 1 |
| /ancillary_data/data_start_utc: | Array of Strings [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/data_start_utc contentType: auxiliaryInformation source: Derived description: UTC (in CCSDS-A format) of the first data point within the granule. long_name: Start UTC Time of Granule (CCSDS-A, Actual) units: 1 |
| /ancillary_data/coarse_surface_finding/bin_c: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/coarse_surface_finding/bin_c contentType: auxiliaryInformation description: bin size of coarse histogram long_name: bin size coarse histogram source: Sea Ice ATBD units: meters |
| /ancillary_data/coarse_surface_finding/coarse_ub_wins: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/coarse_surface_finding/coarse_ub_wins contentType: auxiliaryInformation description: Upper bound for signal photons when performing coarse tracking long_name: Coarse_UpperBounds source: Sea Ice ATBD units: meters |
| /ancillary_data/coarse_surface_finding/th_pc: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/coarse_surface_finding/th_pc contentType: auxiliaryInformation description: percentage cloud cover coarse long_name: threshold percentage cloud cover coarse source: Sea Ice ATBD units: 1 |
| /ancillary_data/coarse_surface_finding/coarse_lb_wins: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/coarse_surface_finding/coarse_lb_wins contentType: auxiliaryInformation description: Lower bound for signal photons when performing coarse tracking long_name: Coarse_LowerrBounds source: Sea Ice ATBD units: meters |
| /ancillary_data/coarse_surface_finding/l: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/coarse_surface_finding/l contentType: auxiliaryInformation description: along track segment length coarse long_name: segment length coarse source: Sea Ice ATBD units: meters |
| /ancillary_data/coarse_surface_finding/th_d_bot: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/coarse_surface_finding/th_d_bot contentType: auxiliaryInformation source: Sea Ice ATBD description: Bottom distance from mode coarse long_name: Bottom threshold distance from mode coarse units: meters |
| /ancillary_data/coarse_surface_finding/th_fm: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/coarse_surface_finding/th_fm contentType: auxiliaryInformation source: Sea Ice ATBD description: fraction of histogram peak coarse long_name: threshold fraction of peak coarse units: 1 |
| /ancillary_data/coarse_surface_finding/n_ph_min: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/coarse_surface_finding/n_ph_min contentType: auxiliaryInformation description: Minimum number of photons required for coarse track segment long_name: Minimum Number of Photons source: Sea Ice ATBD units: 1 |
| /ancillary_data/coarse_surface_finding/si_conc_min: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/coarse_surface_finding/si_conc_min contentType: auxiliaryInformation source: Sea Ice ATBD description: Minimum sea ice concentration percentage value for which to process data. long_name: Min SI Concentration Thresh units: 1 |
| /ancillary_data/coarse_surface_finding/th_d_top: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/coarse_surface_finding/th_d_top contentType: auxiliaryInformation description: Top distance from mode coarse long_name: Top threshold distance from mode coarse source: Sea Ice ATBD units: meters |
| /ancillary_data/coarse_surface_finding/th_tc: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/coarse_surface_finding/th_tc contentType: auxiliaryInformation description: height deviations from surface or adjacent strong beam long_name: Threshold height deviations source: Sea Ice ATBD units: 1 |
| /ancillary_data/surface_classification/theta_ref: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/surface_classification/theta_ref contentType: auxiliaryInformation description: Solar elevation normalization angle for use of normalized background rate long_name: Solar elevation normalization angle source: ATBD section 4.3.1.4 units: degrees |
| /ancillary_data/surface_classification/height_pct: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/surface_classification/height_pct contentType: auxiliaryInformation description: Percentile of sorted heights long_name: Percentile Hts source: Sea Ice ATBD units: percentile |
| /ancillary_data/surface_classification/w1: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/surface_classification/w1 contentType: auxiliaryInformation description: max width (dark smooth lead) long_name: max width (dark smooth lead) source: Sea Ice ATBD units: meters |
| /ancillary_data/surface_classification/beam_gain: | Array of 32 bit Reals [ = 0..5] HDF5_OBJ_FULLPATH: /ancillary_data/surface_classification/beam_gain contentType: auxiliaryInformation description: Relative gains for beams 1 through 6 where N is the beam number (Note: Beams 1, 3, and 5 are the strong beams) long_name: relative beam gain for beams 1 through 6 source: Sea Ice ATBD units: 1 |
| /ancillary_data/surface_classification/p3: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/surface_classification/p3 contentType: auxiliaryInformation description: photon rate (shadow) long_name: pr (shadow) source: Sea Ice ATBD units: 1 |
| /ancillary_data/surface_classification/b1: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/surface_classification/b1 contentType: auxiliaryInformation description: max backgr (gray ice) long_name: max backgr (gray ice) source: Sea Ice ATBD units: 1 |
| /ancillary_data/surface_classification/p4: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/surface_classification/p4 contentType: auxiliaryInformation description: photon rate (specular) long_name: pr (specular) source: Sea Ice ATBD units: 1 |
| /ancillary_data/surface_classification/w2: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/surface_classification/w2 contentType: auxiliaryInformation description: max width (dark rough lead) long_name: max width (dark rough lead) source: Sea Ice ATBD units: meters |
| /ancillary_data/surface_classification/theta_cntl: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/surface_classification/theta_cntl contentType: auxiliaryInformation source: Sea Ice ATBD description: Solar elevation for controlling use of background rate long_name: Solar elevation for use of background rate units: 1 |
| /ancillary_data/surface_classification/theta_nlb: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/surface_classification/theta_nlb contentType: auxiliaryInformation units: degrees description: Solar elevation normalization lower bound for use of normalized background rate long_name: Solar elevation normalization lower bound source: ATBD section 4.3.1.4 |
| /ancillary_data/surface_classification/p1: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/surface_classification/p1 contentType: auxiliaryInformation description: photon rate (clouds) long_name: pr (clouds) source: Sea Ice ATBD units: 1 |
| /ancillary_data/surface_classification/p2: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/surface_classification/p2 contentType: auxiliaryInformation description: photon rate (snow) long_name: pr (snow) source: Sea Ice ATBD units: 1 |
| /ancillary_data/end_gpsweek: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/end_gpsweek contentType: auxiliaryInformation description: GPS week number of the last data point in the granule. long_name: Ending GPSWeek of Granule (Actual) source: Derived units: weeks from 1980-01-06 |
| /ancillary_data/start_rgt: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/start_rgt contentType: auxiliaryInformation description: The starting reference groundtrack (RGT) number associated with the data contained within this granule. There are 1387 reference groundtrack in the ICESat-2 repeat orbit. The reference groundtrack increments each time the spacecraft completes a full orbit of the Earth and resets to 1 each time the spacecraft completes a full cycle. long_name: Starting Reference Groundtrack source: Derived units: 1 valid_max: 1387 valid_min: 1 |
| /ancillary_data/end_gpssow: | Array of 64 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/end_gpssow contentType: auxiliaryInformation description: GPS seconds-of-week of the last data point in the granule. long_name: Ending GPS SOW of Granule (Actual) source: Derived units: seconds |
| /ancillary_data/qa_at_interval: | Array of 64 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/qa_at_interval contentType: auxiliaryInformation description: Statistics time interval for along-track QA data. long_name: QA Along-Track Interval source: control units: 1 |
| /ancillary_data/start_region: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/start_region contentType: auxiliaryInformation description: The starting product-specific region number associated with the data contained within this granule. ICESat-2 data products are separated by geographic regions. The data contained within a specific region are the same for ATL01 and ATL02. ATL03 regions differ slightly because of different geolocation segment locations caused by the irregular shape of the Earth. The region indices for other products are completely independent. long_name: Starting Region source: Derived units: 1 |
| /ancillary_data/start_gpsweek: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/start_gpsweek contentType: auxiliaryInformation description: GPS week number of the first data point in the granule. long_name: Start GPSWeek of Granule (Actual) source: Derived units: weeks from 1980-01-06 |
| /gt3r/sea_ice_segments/heights/height_segment_fit_quality_flag: | Array of 16 bit Integers [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/heights/height_segment_fit_quality_flag _FillValue: -1 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Flag describing the quality of the results of the along-track fit. (-1=height value is invalid; 1=ngrid_w < wlength/2; 2=ngrid_w >= wlength/2; 3=ngrid_dt < dtlength/2; 4=ngrid_dt >= dtlength/2; 5=ngrid_dt >= (dtlength-2): where 1 is best and 5 is poor). Heights are reported even if this flag indicates the height is invalid. flag_meanings: invalid best high med low poor flag_values: -1, 1, 2, 3, 4, 5 long_name: height Quality Flag source: ATBD, section 4.2.4.2 units: 1 valid_max: 5 valid_min: -1 |
| /gt3r/sea_ice_segments/heights/height_segment_length_seg: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/heights/height_segment_length_seg contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: along-track length of segment containing n_photons_actual long_name: length of segment source: ATBD, section 4.2.2.4 units: meters |
| /gt3r/sea_ice_segments/heights/height_segment_asr_calc: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/heights/height_segment_asr_calc _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Computed apparent surface reflectance for the sea ice segment. long_name: Calculated Apparent Surface Reflectivity source: Sea Ice ATBD units: 1 |
| /gt3r/sea_ice_segments/heights/height_segment_quality: | Array of 16 bit Integers [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/heights/height_segment_quality contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Height segment quality flag, 1 is good quality, 0 is bad depending on fit, wguassian, or layer flag flag_meanings: bad_quality good_quality flag_values: 0, 1 long_name: Height Segment Quality Flag source: ATBD, section 4.2.4 units: 1 valid_max: 1 valid_min: 0 |
| /gt3r/sea_ice_segments/heights/height_segment_n_pulse_seg: | Array of 32 bit Integers [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/heights/height_segment_n_pulse_seg contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: number of laser pulses long_name: number of laser pulses source: ATBD, section 4.2.2.4 units: 1 |
| /gt3r/sea_ice_segments/heights/across_track_distance: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/heights/across_track_distance contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Across track distance of photons averaged over the sea ice height segment. long_name: Across Track Distance source: ATBD, section 4.2.4 units: meters |
| /gt3r/sea_ice_segments/heights/height_segment_htcorr_skew: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/heights/height_segment_htcorr_skew _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: height corection for skew long_name: Height Correction for Skew source: ATBD, section 4.2.6 units: meters |
| /gt3r/sea_ice_segments/heights/height_segment_ssh_flag: | Array of 16 bit Integers [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/heights/height_segment_ssh_flag contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Identifies the height segments that are candidates for use as sea surface reference in freeboard calculations in ATL10. 0 = sea ice; 1 = sea surface flag_meanings: sea_ice sea_surface flag_values: 0, 1 long_name: Sea Surface Flag source: ATBD, section 4.3 units: 1 valid_max: 1 valid_min: 0 |
| /gt3r/sea_ice_segments/heights/height_segment_height: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/heights/height_segment_height coordinates: ../delta_time ../latitude ../longitude description: Mean height from along-track segment fit detremined by the sea ice algorithm long_name: height of segment surface source: ATBD, section 4.2.2.4 units: meters _FillValue: 3.402823466e+38 contentType: referenceInformation |
| /gt3r/sea_ice_segments/heights/height_segment_type: | Array of 16 bit Integers [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/heights/height_segment_type contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Value that indicates segment surface type as sea ice or different types of sea surface. 0=cloud covered: rsurf flag_meanings: cloud_covered other specular_lead_low_w_bkg specular_lead_low specular_lead_high_w_bkg specular_lead_high dark_lead_smooth_w_bkg dark_lead_smooth dark_lead_rough_w_bkg dark_lead_rough flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 long_name: Segment surface type source: ATBD, section 4.3 units: 1 valid_max: 9 valid_min: 0 |
| /gt3r/sea_ice_segments/heights/height_segment_confidence: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/heights/height_segment_confidence _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Confidence level in the surface height estimate based on the number of photons; the background noise rate; and the error analysis long_name: Surface height confidence source: ATBD, section 4.2.4.2 units: 1 |
| /gt3r/sea_ice_segments/heights/height_segment_surface_error_est: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/heights/height_segment_surface_error_est _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Error estimate of the surface height long_name: h surface error est source: ATBD, section 4.2.2.4 units: meters |
| /gt3r/sea_ice_segments/heights/height_segment_w_gaussian: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/heights/height_segment_w_gaussian _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: width of best fit gaussian long_name: width of best fit gaussian source: ATBD, section 4.2.4 units: meters |
| /gt3r/sea_ice_segments/heights/height_segment_rms: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/heights/height_segment_rms _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: RMS difference between sea ice modeled and observed photon height distribution long_name: height rms source: ATBD, section 4.2.2.4 units: meters |
| /gt3r/sea_ice_segments/height_segment_id: | Array of 32 bit Integers [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/height_segment_id contentType: referenceInformation coordinates: delta_time latitude longitude description: Identifier of each height segment long_name: Identifier of each height segment source: ATBD, section 5.2 units: 1 |
| /gt3r/sea_ice_segments/seg_dist_x: | Array of 64 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/seg_dist_x contentType: referenceInformation coordinates: delta_time latitude longitude description: Along-track distance from the equator crossing to the segment center. long_name: Along track distance source: Sea Ice ATBD units: meters |
| /gt3r/sea_ice_segments/longitude: | Array of 64 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/longitude contentType: referenceInformation coordinates: delta_time latitude description: Longitude, WGS84, East=+,Lon of segment center long_name: Longitude source: ATBD, section 4.4 standard_name: longitude units: degrees_east valid_max: 180. valid_min: -180. |
| /gt3r/sea_ice_segments/latitude: | Array of 64 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/latitude contentType: referenceInformation coordinates: delta_time longitude description: Latitude, WGS84, North=+, Lat of segment center long_name: Latitude source: ATBD, section 4.4 standard_name: latitude units: degrees_north valid_max: 90. valid_min: -90. |
| /gt3r/sea_ice_segments/geophysical/height_segment_t2m: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geophysical/height_segment_t2m _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Temperature at 2m above the displacement height (K) long_name: temperature_at_2m source: ATL09 standard_name: temperature units: K |
| /gt3r/sea_ice_segments/geophysical/height_segment_dac: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geophysical/height_segment_dac _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect. long_name: Dynamic Atmosphere Correction source: Sea Ice ATBD units: meters |
| /gt3r/sea_ice_segments/geophysical/height_segment_ps: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geophysical/height_segment_ps _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Sea Level Pressure (Pa) long_name: sea level pressure source: ATL09 standard_name: pressure units: Pa |
| /gt3r/sea_ice_segments/geophysical/height_segment_ib: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geophysical/height_segment_ib _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Inverted barometer effect calculated from surface pressure long_name: Inverted barometer effect source: ATBD, section 4.2 units: meters |
| /gt3r/sea_ice_segments/geophysical/height_segment_load: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geophysical/height_segment_load _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm). long_name: Load Tide source: Sea Ice ATBD units: meters |
| /gt3r/sea_ice_segments/geophysical/height_segment_geoid: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geophysical/height_segment_geoid _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Geoid height above WGS-84 reference ellipsoid (range -107 to 86m), based on the EGM2008 model. long_name: EGM2008 Geoid source: Sea Ice ATBD units: meters |
| /gt3r/sea_ice_segments/geophysical/height_segment_ocean: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geophysical/height_segment_ocean _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium) long_name: Ocean Tide source: Sea Ice ATBD units: meters |
| /gt3r/sea_ice_segments/geophysical/height_segment_v2m: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geophysical/height_segment_v2m _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Northward wind at 2m above the displacement height (m/s-1) long_name: Northward_wind_at_2m source: ATL09 standard_name: northward_wind units: m s-1 |
| /gt3r/sea_ice_segments/geophysical/height_segment_mss: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geophysical/height_segment_mss _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Mean sea surface height above WGS-84 reference ellipsoid (range: -105 to 87m), based on the DTU13 model. long_name: DTU13 Mean Sea Surface source: Sea Ice ATBD units: meters |
| /gt3r/sea_ice_segments/geophysical/height_segment_u2m: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geophysical/height_segment_u2m _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Eastward wind at 2m above the displacement height (m/s-1) long_name: Eastward_wind_at_2m source: ATL09 standard_name: eastward_wind units: m s-1 |
| /gt3r/sea_ice_segments/geophysical/height_segment_lpe: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geophysical/height_segment_lpe _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Long period equilibrium tide self-consistent with ocean tide model (+-0.04m). (dependent only on time and latitude) long_name: Equilibrium Tide source: Sea Ice ATBD units: meters |
| /gt3r/sea_ice_segments/geophysical/height_segment_earth: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geophysical/height_segment_earth _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Solid Earth Tide long_name: Earth Tide source: Sea Ice ATBD units: meters |
| /gt3r/sea_ice_segments/geophysical/height_segment_pole: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geophysical/height_segment_pole coordinates: ../delta_time ../latitude ../longitude description: Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm). long_name: Pole Tide source: Sea Ice ATBD units: meters _FillValue: 3.402823466e+38 contentType: referenceInformation |
| /gt3r/sea_ice_segments/geoseg_beg: | Array of 32 bit Integers [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geoseg_beg contentType: referenceInformation coordinates: delta_time latitude longitude description: Geolocation segment (geoseg) ID associated with the first photon used in this sea ice segment long_name: Beginning GEOSEG source: Sea Ice ATBD units: 1 |
| /gt3r/sea_ice_segments/delta_time: | Array of 64 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/delta_time contentType: physicalMeasurement coordinates: latitude longitude description: Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name: Elapsed GPS seconds source: telemetry standard_name: time units: seconds since 2018-01-01 CLASS: DIMENSION_SCALE NAME: gt3r/sea_ice_segments/delta_time |
| /gt3r/sea_ice_segments/stats/msw_flag: | Array of 16 bit Integers [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/msw_flag contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Multiple Scattering warning flag. The multiple scattering warning flag (ATL09 parameter msw_flag) has values from -1 to 5 where zero means no multiple scattering and 5 the greatest. If no layers were detected, then msw_flag = 0. If blowing snow is detected and its estimated optical depth is greater than or equal to 0.5, then msw_flag = 5. If the blowing snow optical depth is less than 0.5, then msw_flag = 4. If no blowing snow is detected but there are cloud or aerosol layers detected, the msw_flag assumes values of 1 to 3 based on the height of the bottom of the lowest layer: < 1 km, msw_flag = 3; 1-3 km, msw_flag = 2; > 3km, msw_flag = 1. A value of -1 indicates that the signal to noise of the data was too low to reliably ascertain the presence of cloud or blowing snow. We expect values of -1 to occur only during daylight. flag_meanings: cannot_determine no_layers layer_gt_3km layer_between_1_and_3_km layer_lt_1km blow_snow_od_lt_0.5 blow_snow_od_gt_0.5 flag_values: -1, 0, 1, 2, 3, 4, 5 long_name: Multiple Scattering Warning Flag source: Atmosphere ATBD units: 1 valid_max: 5 valid_min: -1 |
| /gt3r/sea_ice_segments/stats/hist_median_h: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/hist_median_h _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Median of the n_fit_photons heights long_name: trimmed photon heights median source: ATBD, section 4.2.3.1 units: meters |
| /gt3r/sea_ice_segments/stats/height_filter_min: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/height_filter_min _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: height minimum used in the ssh height filter long_name: Height Filter Min source: sea ice ATBD , sect 4.2.1.2 units: meters |
| /gt3r/sea_ice_segments/stats/cloud_flag_atm: | Array of 16 bit Integers [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/cloud_flag_atm contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Number of layers found from the backscatter profile using the DDA layer finder. long_name: Cloud Flag Atm source: Atmosphere ATBD units: 1 valid_max: 10 valid_min: 0 |
| /gt3r/sea_ice_segments/stats/fpb_avg_dt: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/fpb_avg_dt _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: FPB correction average dead time long_name: fpb correction average deadtime source: Sea Ice ATBD units: ns |
| /gt3r/sea_ice_segments/stats/ds_si_hist_bins: | Array of 32 bit Integers [ = 0..220] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/ds_si_hist_bins CLASS: DIMENSION_SCALE NAME: ds_si_hist_bins contentType: auxiliaryInformation description: Dimension scale indexing the sea ice histogram bins. The bin heights must be computed from information contained within the same group as the histogram. long_name: Sea Ice Histogram Bins Dimension Scale source: SeaIce ATBD units: 1 |
| /gt3r/sea_ice_segments/stats/fpb_strength: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/fpb_strength _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: FPB correction strength long_name: fpb correction strength source: Sea Ice ATBD units: photons/shot |
| /gt3r/sea_ice_segments/stats/bsnow_con: | Array of 16 bit Integers [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/bsnow_con _FillValue: 127 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Blowing snow confidence long_name: Blowing snow confidence source: ATL09 units: 1 |
| /gt3r/sea_ice_segments/stats/layer_flag: | Array of 16 bit Integers [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/layer_flag contentType: qualityInformation coordinates: ../delta_time ../latitude ../longitude description: This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow. flag_meanings: likely_clear likely_cloudy flag_values: 0, 1 long_name: Consolidated cloud flag source: Atmosphere ATBD units: 1 valid_max: 1 valid_min: 0 |
| /gt3r/sea_ice_segments/stats/hist_photon_bin_size: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/hist_photon_bin_size contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: bin size of photon height histogram long_name: height histogram bin size source: ATBD, section 4.2.2.4 units: meters |
| /gt3r/sea_ice_segments/stats/backgr_calc: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/backgr_calc _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Calculated background count rate based on sun angle, surface slope, unit reflectance long_name: background count rate calculated source: ATBD, section 4.2.3 units: hz |
| /gt3r/sea_ice_segments/stats/fpb_corr: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/fpb_corr _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Estimated first-photon bias(fpb) correction to mean segment height long_name: first photon bias correction source: Sea Ice ATBD units: meters |
| /gt3r/sea_ice_segments/stats/bsnow_h: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/bsnow_h _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Blowing snow layer top height long_name: Blowing snow top h source: ATL09 units: meters |
| /gt3r/sea_ice_segments/stats/hist_photon_bottom: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/hist_photon_bottom contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: lower bound of height histogram long_name: height histogram minimum source: ATBD, section 4.2.2.4 units: meters |
| /gt3r/sea_ice_segments/stats/background_r_norm: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/background_r_norm _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Background rate normalized to a fixed solar elevation angle long_name: Normalized background (50-shot) source: ATBD section 4.3.1.3 units: hz |
| /gt3r/sea_ice_segments/stats/exmax_mean_2: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/exmax_mean_2 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height mean 2 long_name: Exmax Mean 2 source: sea ice ATBD Appendix E units: meters |
| /gt3r/sea_ice_segments/stats/background_int_height: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/background_int_height _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: The height of the altimetric range window after subtracting the height span of the signal photon events in the 50-shot span long_name: Height of column used in background calculation source: ATBD, section 7.3 units: meters |
| /gt3r/sea_ice_segments/stats/n_photons_actual: | Array of 16 bit Integers [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/n_photons_actual _FillValue: -1 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Number of photons gathered long_name: Number of photons found for the segment source: ATBD, section 4.2.2.4 units: 1 |
| /gt3r/sea_ice_segments/stats/ice_conc: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/ice_conc contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: sea ice concentration long_name: sea ice concentration source: ATBD, section 3.1.4 units: 1 |
| /gt3r/sea_ice_segments/stats/exmax_stdev_2: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/exmax_stdev_2 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height standard deviation 2 long_name: Exmax Stdev 2 source: sea ice ATBD Appendix E units: meters |
| /gt3r/sea_ice_segments/stats/cloud_flag_asr: | Array of 16 bit Integers [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/cloud_flag_asr contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: Cloud flag (probability) from apparent surface reflectance. 0=clear with high confidence; 1=clear with medium confidence; 2=clear with low confidence; 3=cloudy with low confidence; 4=cloudy with medium confidence; 5=cloudy with high confidence; 6=unknown flag_meanings: clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence unknown flag_values: 0, 1, 2, 3, 4, 5, 6 long_name: Cloud Flag ASR source: Atmosphere ATBD units: 1 valid_max: 6 valid_min: 0 |
| /gt3r/sea_ice_segments/stats/exmax_stdev_1: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/exmax_stdev_1 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height standard deviation 1 long_name: Exmax Stdev 1 source: sea ice ATBD Appendix E units: meters |
| /gt3r/sea_ice_segments/stats/fpb_corr_width: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/fpb_corr_width _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: FPB correction width long_name: fpb correction width source: Sea Ice ATBD units: ns |
| /gt3r/sea_ice_segments/stats/height_coarse_stdev: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/height_coarse_stdev contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: height standard deviation of coarse tracker long_name: Coarse Height Sdev source: sea ice ATBD , sect 4.2.1.2 units: meters |
| /gt3r/sea_ice_segments/stats/height_filter_05: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/height_filter_05 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: height fifth percentile used in the ssh height filter long_name: Height Filter 5th Percentile source: sea ice ATBD , sect 4.2.1.2 units: meters |
| /gt3r/sea_ice_segments/stats/n_photons_used: | Array of 16 bit Integers [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/n_photons_used _FillValue: -1 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Number of photons in the trimmed histogram. long_name: Number of photons used for fit source: ATBD, section 4.2.2.4 units: 1 |
| /gt3r/sea_ice_segments/stats/backgr_r_200: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/backgr_r_200 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Background count rate, averaged over the segment based on ATLAS 50 pulse counts long_name: Background rate 200 hz source: ATL09 units: hz |
| /gt3r/sea_ice_segments/stats/hist_photon_top: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/hist_photon_top contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: upper bound of height histogram long_name: height histogram maximum source: ATBD, section 4.2.2.4 units: meters |
| /gt3r/sea_ice_segments/stats/hist_w: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/hist_w _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Segment histogram width estimate long_name: Segment histogram width estimate source: ATBD, section 4.2.2.4 units: meters |
| /gt3r/sea_ice_segments/stats/hist_mean_h: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/hist_mean_h _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Mean of the n_fit_photons heights long_name: photon heights mean source: ATBD, section 4.2.2.4 units: meters |
| /gt3r/sea_ice_segments/stats/height_coarse_mn: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/height_coarse_mn contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: height mean of coarse tracker long_name: Coarse Track Height Mean source: sea ice ATBD , sect 4.2.1.2 units: meters |
| /gt3r/sea_ice_segments/stats/exmax_mean_1: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/exmax_mean_1 _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height mean 1 long_name: Exmax Mean 1 source: sea ice ATBD Appendix E units: meters |
| /gt3r/sea_ice_segments/stats/hist_photon_heights: | Array of 16 bit Integers [ = 0..278029][ = 0..220] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/hist_photon_heights contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Histogram of the n_fit_photons heights long_name: photon heights histogram source: ATBD, section 4.2.2.4 units: 1 |
| /gt3r/sea_ice_segments/stats/trim_height_top: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/trim_height_top _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: maximum height of trimmed photons used in the surface calculation procedure long_name: maximum height of trimmed photons source: ATBD, section 4.2.2.4 units: meters |
| /gt3r/sea_ice_segments/stats/exmax_mix: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/exmax_mix _FillValue: 3.402823466e+38 contentType: modelResult coordinates: ../delta_time ../latitude ../longitude description: exmax height mix ratio long_name: Exmax Mix source: sea ice ATBD Appendix E units: meters |
| /gt3r/sea_ice_segments/stats/asr_25: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/asr_25 _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Apparent surface reflectance at 25 hz, averaged to the sea ice segment. long_name: Apparent Surface Reflectance 25hz source: Sea Ice ATBD units: 1 |
| /gt3r/sea_ice_segments/stats/photon_rate: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/photon_rate _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: photon count rate, averaged over segment long_name: photon rate source: ATBD, section 4.2.2.4 units: photons/shot |
| /gt3r/sea_ice_segments/stats/trim_height_bottom: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/trim_height_bottom _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: minimum height of trimmed photons used in the surface calculation procedure long_name: minimum height of trimmed photons source: ATBD, section 4.2.2.4 units: meters |
| /gt3r/sea_ice_segments/stats/n_photons_define: | Array of 16 bit Integers [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/n_photons_define _FillValue: -1 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Number of photons to gather. long_name: Number of photons defining the segment source: ATBD, section 4.2.2.4 units: 1 |
| /gt3r/sea_ice_segments/stats/backgr_r_25: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/stats/backgr_r_25 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Background count rate, averaged over the segment based on 25 hz atmosphere long_name: Background rate 25hz source: ATL09 units: hz |
| /gt3r/sea_ice_segments/geoseg_end: | Array of 32 bit Integers [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geoseg_end contentType: referenceInformation coordinates: delta_time latitude longitude description: Geolocation segment (geoseg) ID associated with the last photon used in this sea ice segment long_name: Ending GEOSEG source: Sea Ice ATBD units: 1 |
| /gt3r/sea_ice_segments/geolocation/rgt: | Array of 16 bit Integers [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geolocation/rgt contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: The reference ground track (RGT) is the track on the earth at which a specified unit vector within the observatory is pointed. Under nominal operating conditions, there will be no data collected along the RGT, as the RGT is spanned by GT3 and GT4. During slews or off-pointing, it is possible that ground tracks may intersect the RGT. The ICESat-2 mission has 1387 RGTs. long_name: Reference Ground track source: Sea Ice ATBD units: 1 valid_max: 1387 valid_min: 1 |
| /gt3r/sea_ice_segments/geolocation/sigma_lon: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geolocation/sigma_lon _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Estimated uncertainty for the reference photon bounce point east longitude: 1- sigma (degrees). Applies to all other photons in the group. long_name: longitude uncertainty source: Sea Ice ATBD units: degrees |
| /gt3r/sea_ice_segments/geolocation/ref_atm_delay: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geolocation/ref_atm_delay _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Atmospheric path delay, in range, for the reference photon. long_name: Reference Photon Atm. Path Delay source: Sea Ice ATBD units: meters |
| /gt3r/sea_ice_segments/geolocation/beam_azimuth: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geolocation/beam_azimuth _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft). When the spacecraft is precisely at the geodetic zenith, the value will be 99999 degrees. long_name: beam azimuth source: Sea Ice ATBD units: degrees_east |
| /gt3r/sea_ice_segments/geolocation/solar_azimuth: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geolocation/solar_azimuth contentType: physicalMeansurement coordinates: ../delta_time ../latitude ../longitude description: The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot. long_name: solar azimuth source: Sea Ice ATBD units: degrees_east |
| /gt3r/sea_ice_segments/geolocation/ref_atm_delay_derivative: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geolocation/ref_atm_delay_derivative _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Atmospheric path delay derivative with respect to ellipsoid for the reference photon, in meters per meter. long_name: Derivative of Atm. Path Delay source: Sea Ice ATBD units: meters/meter |
| /gt3r/sea_ice_segments/geolocation/sigma_lat: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geolocation/sigma_lat _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Estimated uncertainty for the reference photon bounce point geodetic latitude: 1- sigma (degrees). Applies to all other photons in the group long_name: latitude uncertainty source: Sea Ice ATBD units: 1 |
| /gt3r/sea_ice_segments/geolocation/beam_coelev: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geolocation/beam_coelev _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Co-elevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot. long_name: beam co-elevation source: Sea Ice ATBD units: degrees |
| /gt3r/sea_ice_segments/geolocation/sigma_h: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geolocation/sigma_h _FillValue: 3.402823466e+38 contentType: referenceInformation coordinates: ../delta_time ../latitude ../longitude description: Estimated uncertainty for the reference photon bounce point ellipsoid height: 1- sigma (m). Error estimates for all other photons in the group are computed with the scale defined below. long_name: height uncertainty source: Sea Ice ATBD units: 1 |
| /gt3r/sea_ice_segments/geolocation/solar_elevation: | Array of 32 bit Reals [ = 0..278029] HDF5_OBJ_FULLPATH: /gt3r/sea_ice_segments/geolocation/solar_elevation contentType: physicalMeansurement coordinates: ../delta_time ../latitude ../longitude description: Solar Angle above or below the plane tangent to the ellipsoid surface at the laser spot. Positive values mean the sun is above the horizon, while negative values mean it is below the horizon. The effect of atmospheric refraction is not included. This is a low precision value, with approximately TBD degree accuracy. long_name: solar elevation source: Sea Ice ATBD units: degrees |