| HDF5_OBJ_FULLPATH: | H5_GLOBAL |
| short_name: | ATL06 |
| level: | L3A |
| description: | This data set (ATL06) provides geolocated, land-ice surface heights (above the WGS 84 ellipsoid, ITRF2014 reference frame), plus ancillary parameters that can be used to interpret and assess the quality of the height estimates. The data were acquired by th |
| Conventions: | CF-1.6 |
| contributor_name: | Thomas A 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 |
| data_rate: | Data within this group pertain to the granule in its entirety. |
| date_type: | UTC |
| featureType: | trajectory |
| geospatial_lat_units: | degrees_north |
| geospatial_lon_units: | degrees_east |
| granule_type: | ATL06 |
| identifier_product_doi_authority: | http://dx.doi.org |
| 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 |
| spatial_coverage_type: | Horizontal |
| standard_name_vocabulary: | CF-1.6 |
| time_type: | CCSDS UTC-A |
| date_created: | 2025-12-19T22:01:54.000000Z |
| hdfversion: | HDF5 1.14.4 |
| history: | 2025-12-19T22:01:54.000000Z;fe870c8f-7533-3a33-8c17-d667ecdd83b6;Created by PGE atlas_l3a_is Version 5.1 |
| identifier_file_uuid: | fe870c8f-7533-3a33-8c17-d667ecdd83b6 |
| identifier_product_format_version: | 5.1 |
| time_coverage_duration: | 422. |
| time_coverage_end: | 2025-09-13T14:30:26.000000Z |
| time_coverage_start: | 2025-09-13T14:23:24.000000Z |
| geospatial_lat_min: | 25.474481959584711 |
| geospatial_lon_min: | -171.42912310348692 |
| geospatial_lat_max: | 25.51268125829365 |
| geospatial_lon_max: | -171.42503689992421 |
| 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/ |
| title: | ATLAS/ICESat-2 L3A Land Ice Height |
| identifier_product_type: | ATL06 |
| identifier_product_doi: | doi:10.5067/ATLAS/ATL06.007 |
| institution: | National Aeronautics and Space Administration (NASA) |
| creator_name: | GSFC I-SIPS > ICESat-2 Science Investigator-led Processing System |
| summary: | ATL06 provides estimates of the ice-sheet mean surface height relative to the WGS-84 ellipsoid, and ancillary parameters needed to interpret and assess the quality of these height estimates. |
| keywords: | EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > GLACIER ELEVATION/ICE SHEET ELEVATION > 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: | 3A |
| 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 |
| /ancillary_data/release: | Array of Strings [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/release long_name: Release Number units: 1 source: Operations 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. |
| /ancillary_data/end_geoseg: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/end_geoseg long_name: Ending Geolocation Segment units: 1 source: Derived 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. |
| /ancillary_data/version: | Array of Strings [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/version long_name: Version units: 1 source: Operations 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. |
| /ancillary_data/end_region: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/end_region long_name: Ending Region units: 1 source: Derived 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. |
| /ancillary_data/atlas_sdp_gps_epoch: | Array of 64 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/atlas_sdp_gps_epoch long_name: ATLAS Epoch Offset units: seconds since 1980-01-06T00:00:00.000000Z source: Operations 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. |
| /ancillary_data/end_rgt: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/end_rgt long_name: Ending Reference Groundtrack units: 1 source: Derived valid_min: 1 valid_max: 1387 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. |
| /ancillary_data/end_delta_time: | Array of 64 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/end_delta_time long_name: ATLAS End Time (Actual) standard_name: time units: seconds since 2018-01-01 source: Derived 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. |
| /ancillary_data/end_orbit: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/end_orbit long_name: Ending Orbit Number units: 1 source: Derived 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. |
| /ancillary_data/start_cycle: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/start_cycle long_name: Starting Cycle units: 1 source: Derived valid_min: 0 valid_max: 99 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. |
| /ancillary_data/data_end_utc: | Array of Strings [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/data_end_utc long_name: End UTC Time of Granule (CCSDS-A, Actual) units: 1 source: Derived contentType: auxiliaryInformation description: UTC (in CCSDS-A format) of the last data point within the granule. |
| /ancillary_data/control: | Array of Strings [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/control long_name: Control File units: 1 source: Operations contentType: auxiliaryInformation description: PGE-specific control file used to generate this granule. To re-use, replace breaks (BR) with linefeeds. |
| /ancillary_data/start_gpssow: | Array of 64 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/start_gpssow long_name: Start GPS SOW of Granule (Actual) units: seconds source: Derived contentType: auxiliaryInformation description: GPS seconds-of-week of the first data point in the granule. |
| /ancillary_data/granule_end_utc: | Array of Strings [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/granule_end_utc long_name: End UTC Time of Granule (CCSDS-A, Requested) units: 1 source: Derived contentType: auxiliaryInformation description: Requested end time (in UTC CCSDS-A) of this granule. |
| /ancillary_data/end_cycle: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/end_cycle long_name: Ending Cycle units: 1 source: Derived valid_min: 0 valid_max: 99 contentType: auxiliaryInformation 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. |
| /ancillary_data/granule_start_utc: | Array of Strings [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/granule_start_utc long_name: Start UTC Time of Granule (CCSDS-A, Requested) units: 1 source: Derived contentType: auxiliaryInformation description: Requested start time (in UTC CCSDS-A) of this granule. |
| /ancillary_data/start_delta_time: | Array of 64 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/start_delta_time long_name: ATLAS Start Time (Actual) standard_name: time units: seconds since 2018-01-01 source: Derived 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. |
| /ancillary_data/start_geoseg: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/start_geoseg long_name: Starting Geolocation Segment units: 1 source: Derived 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. |
| /ancillary_data/start_orbit: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/start_orbit long_name: Starting Orbit Number units: 1 source: Derived 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. |
| /ancillary_data/data_start_utc: | Array of Strings [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/data_start_utc long_name: Start UTC Time of Granule (CCSDS-A, Actual) units: 1 source: Derived contentType: auxiliaryInformation description: UTC (in CCSDS-A format) of the first data point within the granule. |
| /ancillary_data/end_gpsweek: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/end_gpsweek long_name: Ending GPSWeek of Granule (Actual) contentType: auxiliaryInformation description: GPS week number of the last data point in the granule. units: weeks from 1980-01-06 source: Derived |
| /ancillary_data/start_rgt: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/start_rgt long_name: Starting Reference Groundtrack units: 1 source: Derived valid_min: 1 valid_max: 1387 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. |
| /ancillary_data/end_gpssow: | Array of 64 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/end_gpssow long_name: Ending GPS SOW of Granule (Actual) units: seconds source: Derived contentType: auxiliaryInformation description: GPS seconds-of-week of the last data point in the granule. |
| /ancillary_data/land_ice/rbin_width: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/land_ice/rbin_width long_name: Bin Size units: meters source: Operations contentType: auxiliaryInformation description: Residual histogram bin size |
| /ancillary_data/land_ice/sigma_beam: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/land_ice/sigma_beam long_name: Sigma of Gaussian Footprint units: meters source: Operations contentType: auxiliaryInformation description: Spatial sigma of the Gaussian footprint (m) |
| /ancillary_data/land_ice/qs_lim_hsigma: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/land_ice/qs_lim_hsigma long_name: Height Sigma QS Limit units: 1 source: Operations contentType: auxiliaryInformation description: atl06_quality_summary limit for testing Height Sigma. |
| /ancillary_data/land_ice/fit_maxiter: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/land_ice/fit_maxiter long_name: Maximum Iterations of Fit units: 1 source: Operations contentType: auxiliaryInformation description: Maximum number of iterations in at_seg_fit |
| /ancillary_data/land_ice/txp_maxiter: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/land_ice/txp_maxiter long_name: Maximum Iterations units: counts source: Operations contentType: auxiliaryInformation description: Maximum number of iterations in tx_shape_corr |
| /ancillary_data/land_ice/qs_lim_hrs: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/land_ice/qs_lim_hrs long_name: Height Robust Spread QS Limit units: meters source: Operations contentType: auxiliaryInformation description: atl06_quality_summary limit for testing Height Robust Spread. |
| /ancillary_data/land_ice/qs_lim_bsc: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/land_ice/qs_lim_bsc long_name: Blowing Snow Confidence QS Limit units: 1 source: Operations contentType: auxiliaryInformation description: atl06_quality_summary limit for testing Blowing Snow Confidence. |
| /ancillary_data/land_ice/qs_lim_snr: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/land_ice/qs_lim_snr long_name: SNR Significance QS Limit units: 1 source: Operations contentType: auxiliaryInformation description: atl06_quality_summary limit for testing SNR Significance. |
| /ancillary_data/land_ice/n_hist: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/land_ice/n_hist long_name: Number of Histogram Bins units: 1 source: Operations contentType: auxiliaryInformation description: Number of bins in a histogram |
| /ancillary_data/land_ice/min_gain_th: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/land_ice/min_gain_th long_name: Minimum Gain Threshold units: 1 source: Operations contentType: auxiliaryInformation description: Minimum estimated gain threshold (3.1.6) |
| /ancillary_data/land_ice/qs_lim_sss: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/land_ice/qs_lim_sss long_name: Signal Selection Source QS Limit units: 1 source: Operations contentType: auxiliaryInformation description: atl06_quality_summary limit for testing Signal Selection Source. |
| /ancillary_data/land_ice/n_sigmas: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/land_ice/n_sigmas long_name: Number of Sigmas units: 1 source: Operations contentType: auxiliaryInformation description: Multiplied by sigma_expected to get h_win |
| /ancillary_data/land_ice/dt_hist: | Array of 64 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/land_ice/dt_hist long_name: Histogram Bin Size units: seconds source: Operations contentType: auxiliaryInformation description: Bin size for histograms (sec) |
| /ancillary_data/land_ice/sigma_tx: | Array of 32 bit Reals [ = 0..5] HDF5_OBJ_FULLPATH: /ancillary_data/land_ice/sigma_tx long_name: Sigma Tx units: seconds source: Operations contentType: auxiliaryInformation description: RDE of the Tx pulse in ATLAS Spot order (1-6). Calculated as half the difference between the 84th and 16th percentiles of the signal bins. |
| /ancillary_data/land_ice/min_signal_conf: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/land_ice/min_signal_conf long_name: Minimum Signal Confidence units: 1 source: Operations valid_min: 0 valid_max: 4 contentType: auxiliaryInformation description: Minimum signal confidence level for a photon to be considered valid. |
| /ancillary_data/land_ice/t_dead: | Array of 32 bit Reals [ = 0..5] HDF5_OBJ_FULLPATH: /ancillary_data/land_ice/t_dead long_name: Dead Time units: seconds source: Operations contentType: auxiliaryInformation description: Dead time, in ATLAS spot order (1-6). Calculated as the average of the CAL42 per-channel dead times, using the appropriate channels for strong and weak spots. |
| /ancillary_data/land_ice/qs_lim_msw: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/land_ice/qs_lim_msw long_name: Multiple Scattering Warning QS Limit units: 1 source: Operations contentType: auxiliaryInformation description: atl06_quality_summary limit for testing Multiple Scattering Warning. |
| /ancillary_data/land_ice/min_n_sel: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/land_ice/min_n_sel long_name: Mininum Number of Photons units: 1 source: Operations contentType: auxiliaryInformation description: Minimum number of selected PEs in pe_select |
| /ancillary_data/land_ice/max_res_ids: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/land_ice/max_res_ids long_name: Max Segments units: 1 source: Operations contentType: auxiliaryInformation description: Maximum number of segment ids in each residual_histogram |
| /ancillary_data/land_ice/proc_interval: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/land_ice/proc_interval long_name: Processing Interval units: seconds source: Operations contentType: auxiliaryInformation description: Processing interval in number of geolocation segments.. |
| /ancillary_data/land_ice/fpb_maxiter: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/land_ice/fpb_maxiter long_name: Maximum Iterations for FPB units: 1 source: Operations contentType: auxiliaryInformation description: Maximum number of iterations in fpb_corr |
| /ancillary_data/land_ice/min_n_pe: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/land_ice/min_n_pe long_name: Minimum Photons units: 1 source: Operations contentType: auxiliaryInformation description: Minimum # PEs for fit |
| /ancillary_data/land_ice/min_dist: | Array of 32 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/land_ice/min_dist long_name: Minimum Distance units: meters source: Operations contentType: auxiliaryInformation description: Min dist between first and last selected PEs |
| /ancillary_data/land_ice/nhist_bins: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/land_ice/nhist_bins long_name: Number of Bins units: 1 source: Operations contentType: auxiliaryInformation description: Number of bins in residual histogram |
| /ancillary_data/qa_at_interval: | Array of 64 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/qa_at_interval long_name: QA Along-Track Interval units: seconds/cell source: control contentType: auxiliaryInformation description: Statistics time interval for along-track QA data. |
| /ancillary_data/start_region: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/start_region long_name: Starting Region units: 1 source: Derived 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. |
| /ancillary_data/start_gpsweek: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /ancillary_data/start_gpsweek long_name: Start GPSWeek of Granule (Actual) units: weeks from 1980-01-06 source: Derived contentType: auxiliaryInformation description: GPS week number of the first data point in the granule. |
| /quality_assessment/qa_granule_fail_reason: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /quality_assessment/qa_granule_fail_reason long_name: Granule Failure Reason units: 1 source: Operations valid_min: 0 valid_max: 5 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 |
| /quality_assessment/qa_granule_pass_fail: | Array of 32 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /quality_assessment/qa_granule_pass_fail long_name: Granule Pass Flag units: 1 source: Operations valid_min: 0 valid_max: 1 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 |
| /quality_assessment/gt1r/signal_selection_source_fraction_0: | Array of 32 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt1r/signal_selection_source_fraction_0 long_name: Signal Selection Source Fraction 0 units: 1 source: ATL06 ATBD - Q/A Statistics valid_min: 0. valid_max: 1. contentType: qualityInformation description: The fraction of 20m segments with signal_selection_source equal to zero. coordinates: delta_time lat_mean lon_mean |
| /quality_assessment/gt1r/lat_mean: | Array of 64 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt1r/lat_mean long_name: Latitude Mean standard_name: latitude units: degrees_north source: Section 7.2, Q/A Statistics valid_min: -90. valid_max: 90. contentType: physicalMeasurement description: Mean latitude of the 10km segment. coordinates: delta_time lon_mean |
| /quality_assessment/gt1r/signal_selection_source_fraction_1: | Array of 32 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt1r/signal_selection_source_fraction_1 long_name: Signal Selection Source Fraction 1 units: 1 source: ATL06 ATBD - Q/A Statistics valid_min: 0. valid_max: 1. contentType: qualityInformation description: The fraction of 20m segments with signal_selection_source equal to 1. coordinates: delta_time lat_mean lon_mean |
| /quality_assessment/gt1r/lon_mean: | Array of 64 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt1r/lon_mean long_name: Longitude Mean standard_name: longitude units: degrees_east source: Section 7.2, Q/A Statistics valid_min: -180. valid_max: 180. contentType: physicalMeasurement description: Mean longitude of the 10km segment. coordinates: delta_time lat_mean |
| /quality_assessment/gt1r/signal_selection_source_fraction_2: | Array of 32 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt1r/signal_selection_source_fraction_2 long_name: Signal Selection Source Fraction 2 units: 1 source: ATL06 ATBD - Q/A Statistics valid_min: 0. valid_max: 1. contentType: qualityInformation description: The fraction of 20m segments with signal_selection_source equal to 2. coordinates: delta_time lat_mean lon_mean |
| /quality_assessment/gt1r/delta_time: | Array of 64 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt1r/delta_time CLASS: DIMENSION_SCALE NAME: delta_time long_name: Elapsed GPS seconds standard_name: time units: seconds since 2018-01-01 source: Section 7.2, Q/A Statistics contentType: referenceInformation description: Mean number of GPS seconds since the ATLAS SDP epoch for the 10km segment. 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. coordinates: lat_mean lon_mean |
| /quality_assessment/gt1r/signal_selection_source_fraction_3: | Array of 32 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt1r/signal_selection_source_fraction_3 long_name: Signal Selection Source Fraction 3 units: 1 source: ATL06 ATBD - Q/A Statistics valid_min: 0. valid_max: 1. contentType: qualityInformation description: The fraction of 20m segments with signal_selection_source equal to 3. coordinates: delta_time lat_mean lon_mean |
| /quality_assessment/gt2r/signal_selection_source_fraction_0: | Array of 32 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt2r/signal_selection_source_fraction_0 long_name: Signal Selection Source Fraction 0 units: 1 source: ATL06 ATBD - Q/A Statistics valid_min: 0. valid_max: 1. contentType: qualityInformation description: The fraction of 20m segments with signal_selection_source equal to zero. coordinates: delta_time lat_mean lon_mean |
| /quality_assessment/gt2r/delta_time: | Array of 64 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt2r/delta_time CLASS: DIMENSION_SCALE NAME: delta_time long_name: Elapsed GPS seconds standard_name: time units: seconds since 2018-01-01 source: Section 7.2, Q/A Statistics contentType: referenceInformation description: Mean number of GPS seconds since the ATLAS SDP epoch for the 10km segment. 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. coordinates: lat_mean lon_mean |
| /quality_assessment/gt2r/signal_selection_source_fraction_1: | Array of 32 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt2r/signal_selection_source_fraction_1 long_name: Signal Selection Source Fraction 1 units: 1 source: ATL06 ATBD - Q/A Statistics valid_min: 0. valid_max: 1. contentType: qualityInformation description: The fraction of 20m segments with signal_selection_source equal to 1. coordinates: delta_time lat_mean lon_mean |
| /quality_assessment/gt2r/lon_mean: | Array of 64 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt2r/lon_mean long_name: Longitude Mean standard_name: longitude units: degrees_east source: Section 7.2, Q/A Statistics valid_min: -180. valid_max: 180. contentType: physicalMeasurement description: Mean longitude of the 10km segment. coordinates: delta_time lat_mean |
| /quality_assessment/gt2r/signal_selection_source_fraction_2: | Array of 32 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt2r/signal_selection_source_fraction_2 long_name: Signal Selection Source Fraction 2 units: 1 source: ATL06 ATBD - Q/A Statistics valid_min: 0. valid_max: 1. contentType: qualityInformation description: The fraction of 20m segments with signal_selection_source equal to 2. coordinates: delta_time lat_mean lon_mean |
| /quality_assessment/gt2r/lat_mean: | Array of 64 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt2r/lat_mean long_name: Latitude Mean standard_name: latitude units: degrees_north source: Section 7.2, Q/A Statistics valid_min: -90. valid_max: 90. contentType: physicalMeasurement description: Mean latitude of the 10km segment. coordinates: delta_time lon_mean |
| /quality_assessment/gt2r/signal_selection_source_fraction_3: | Array of 32 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt2r/signal_selection_source_fraction_3 long_name: Signal Selection Source Fraction 3 units: 1 source: ATL06 ATBD - Q/A Statistics valid_min: 0. valid_max: 1. contentType: qualityInformation description: The fraction of 20m segments with signal_selection_source equal to 3. coordinates: delta_time lat_mean lon_mean |
| /quality_assessment/gt1l/signal_selection_source_fraction_0: | Array of 32 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt1l/signal_selection_source_fraction_0 long_name: Signal Selection Source Fraction 0 units: 1 source: ATL06 ATBD - Q/A Statistics valid_min: 0. valid_max: 1. contentType: qualityInformation description: The fraction of 20m segments with signal_selection_source equal to zero. coordinates: delta_time lat_mean lon_mean |
| /quality_assessment/gt1l/lat_mean: | Array of 64 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt1l/lat_mean long_name: Latitude Mean standard_name: latitude units: degrees_north source: Section 7.2, Q/A Statistics valid_min: -90. valid_max: 90. contentType: physicalMeasurement description: Mean latitude of the 10km segment. coordinates: delta_time lon_mean |
| /quality_assessment/gt1l/signal_selection_source_fraction_1: | Array of 32 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt1l/signal_selection_source_fraction_1 long_name: Signal Selection Source Fraction 1 units: 1 source: ATL06 ATBD - Q/A Statistics valid_min: 0. valid_max: 1. contentType: qualityInformation description: The fraction of 20m segments with signal_selection_source equal to 1. coordinates: delta_time lat_mean lon_mean |
| /quality_assessment/gt1l/lon_mean: | Array of 64 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt1l/lon_mean long_name: Longitude Mean standard_name: longitude units: degrees_east source: Section 7.2, Q/A Statistics valid_min: -180. valid_max: 180. contentType: physicalMeasurement description: Mean longitude of the 10km segment. coordinates: delta_time lat_mean |
| /quality_assessment/gt1l/signal_selection_source_fraction_2: | Array of 32 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt1l/signal_selection_source_fraction_2 long_name: Signal Selection Source Fraction 2 units: 1 source: ATL06 ATBD - Q/A Statistics valid_min: 0. valid_max: 1. contentType: qualityInformation description: The fraction of 20m segments with signal_selection_source equal to 2. coordinates: delta_time lat_mean lon_mean |
| /quality_assessment/gt1l/delta_time: | Array of 64 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt1l/delta_time CLASS: DIMENSION_SCALE NAME: delta_time long_name: Elapsed GPS seconds standard_name: time units: seconds since 2018-01-01 source: Section 7.2, Q/A Statistics contentType: referenceInformation description: Mean number of GPS seconds since the ATLAS SDP epoch for the 10km segment. 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. coordinates: lat_mean lon_mean |
| /quality_assessment/gt1l/signal_selection_source_fraction_3: | Array of 32 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt1l/signal_selection_source_fraction_3 long_name: Signal Selection Source Fraction 3 units: 1 source: ATL06 ATBD - Q/A Statistics valid_min: 0. valid_max: 1. contentType: qualityInformation description: The fraction of 20m segments with signal_selection_source equal to 3. coordinates: delta_time lat_mean lon_mean |
| /quality_assessment/gt3l/signal_selection_source_fraction_0: | Array of 32 bit Reals [ = 0..21] HDF5_OBJ_FULLPATH: /quality_assessment/gt3l/signal_selection_source_fraction_0 long_name: Signal Selection Source Fraction 0 units: 1 source: ATL06 ATBD - Q/A Statistics valid_min: 0. valid_max: 1. contentType: qualityInformation description: The fraction of 20m segments with signal_selection_source equal to zero. coordinates: delta_time lat_mean lon_mean |
| /quality_assessment/gt3l/delta_time: | Array of 64 bit Reals [ = 0..21] HDF5_OBJ_FULLPATH: /quality_assessment/gt3l/delta_time CLASS: DIMENSION_SCALE NAME: delta_time long_name: Elapsed GPS seconds standard_name: time units: seconds since 2018-01-01 source: Section 7.2, Q/A Statistics contentType: referenceInformation description: Mean number of GPS seconds since the ATLAS SDP epoch for the 10km segment. 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. coordinates: lat_mean lon_mean |
| /quality_assessment/gt3l/signal_selection_source_fraction_1: | Array of 32 bit Reals [ = 0..21] HDF5_OBJ_FULLPATH: /quality_assessment/gt3l/signal_selection_source_fraction_1 long_name: Signal Selection Source Fraction 1 units: 1 source: ATL06 ATBD - Q/A Statistics valid_min: 0. valid_max: 1. contentType: qualityInformation description: The fraction of 20m segments with signal_selection_source equal to 1. coordinates: delta_time lat_mean lon_mean |
| /quality_assessment/gt3l/lon_mean: | Array of 64 bit Reals [ = 0..21] HDF5_OBJ_FULLPATH: /quality_assessment/gt3l/lon_mean long_name: Longitude Mean standard_name: longitude units: degrees_east source: Section 7.2, Q/A Statistics valid_min: -180. valid_max: 180. contentType: physicalMeasurement description: Mean longitude of the 10km segment. coordinates: delta_time lat_mean |
| /quality_assessment/gt3l/signal_selection_source_fraction_2: | Array of 32 bit Reals [ = 0..21] HDF5_OBJ_FULLPATH: /quality_assessment/gt3l/signal_selection_source_fraction_2 long_name: Signal Selection Source Fraction 2 units: 1 source: ATL06 ATBD - Q/A Statistics valid_min: 0. valid_max: 1. contentType: qualityInformation description: The fraction of 20m segments with signal_selection_source equal to 2. coordinates: delta_time lat_mean lon_mean |
| /quality_assessment/gt3l/lat_mean: | Array of 64 bit Reals [ = 0..21] HDF5_OBJ_FULLPATH: /quality_assessment/gt3l/lat_mean long_name: Latitude Mean standard_name: latitude units: degrees_north source: Section 7.2, Q/A Statistics valid_min: -90. valid_max: 90. contentType: physicalMeasurement description: Mean latitude of the 10km segment. coordinates: delta_time lon_mean |
| /quality_assessment/gt3l/signal_selection_source_fraction_3: | Array of 32 bit Reals [ = 0..21] HDF5_OBJ_FULLPATH: /quality_assessment/gt3l/signal_selection_source_fraction_3 long_name: Signal Selection Source Fraction 3 units: 1 source: ATL06 ATBD - Q/A Statistics valid_min: 0. valid_max: 1. contentType: qualityInformation description: The fraction of 20m segments with signal_selection_source equal to 3. coordinates: delta_time lat_mean lon_mean |
| /quality_assessment/gt2l/signal_selection_source_fraction_0: | Array of 32 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt2l/signal_selection_source_fraction_0 long_name: Signal Selection Source Fraction 0 units: 1 source: ATL06 ATBD - Q/A Statistics valid_min: 0. valid_max: 1. contentType: qualityInformation description: The fraction of 20m segments with signal_selection_source equal to zero. coordinates: delta_time lat_mean lon_mean |
| /quality_assessment/gt2l/delta_time: | Array of 64 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt2l/delta_time CLASS: DIMENSION_SCALE NAME: delta_time long_name: Elapsed GPS seconds standard_name: time units: seconds since 2018-01-01 source: Section 7.2, Q/A Statistics contentType: referenceInformation description: Mean number of GPS seconds since the ATLAS SDP epoch for the 10km segment. 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. coordinates: lat_mean lon_mean |
| /quality_assessment/gt2l/signal_selection_source_fraction_1: | Array of 32 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt2l/signal_selection_source_fraction_1 long_name: Signal Selection Source Fraction 1 units: 1 source: ATL06 ATBD - Q/A Statistics valid_min: 0. valid_max: 1. contentType: qualityInformation description: The fraction of 20m segments with signal_selection_source equal to 1. coordinates: delta_time lat_mean lon_mean |
| /quality_assessment/gt2l/lon_mean: | Array of 64 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt2l/lon_mean long_name: Longitude Mean standard_name: longitude units: degrees_east source: Section 7.2, Q/A Statistics valid_min: -180. valid_max: 180. contentType: physicalMeasurement description: Mean longitude of the 10km segment. coordinates: delta_time lat_mean |
| /quality_assessment/gt2l/signal_selection_source_fraction_2: | Array of 32 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt2l/signal_selection_source_fraction_2 long_name: Signal Selection Source Fraction 2 units: 1 source: ATL06 ATBD - Q/A Statistics valid_min: 0. valid_max: 1. contentType: qualityInformation description: The fraction of 20m segments with signal_selection_source equal to 2. coordinates: delta_time lat_mean lon_mean |
| /quality_assessment/gt2l/lat_mean: | Array of 64 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt2l/lat_mean long_name: Latitude Mean standard_name: latitude units: degrees_north source: Section 7.2, Q/A Statistics valid_min: -90. valid_max: 90. contentType: physicalMeasurement description: Mean latitude of the 10km segment. coordinates: delta_time lon_mean |
| /quality_assessment/gt2l/signal_selection_source_fraction_3: | Array of 32 bit Reals [ = 0..-1] HDF5_OBJ_FULLPATH: /quality_assessment/gt2l/signal_selection_source_fraction_3 long_name: Signal Selection Source Fraction 3 units: 1 source: ATL06 ATBD - Q/A Statistics valid_min: 0. valid_max: 1. contentType: qualityInformation description: The fraction of 20m segments with signal_selection_source equal to 3. coordinates: delta_time lat_mean lon_mean |
| /quality_assessment/gt3r/signal_selection_source_fraction_0: | Array of 32 bit Reals [ = 0..21] HDF5_OBJ_FULLPATH: /quality_assessment/gt3r/signal_selection_source_fraction_0 long_name: Signal Selection Source Fraction 0 units: 1 source: ATL06 ATBD - Q/A Statistics valid_min: 0. valid_max: 1. contentType: qualityInformation description: The fraction of 20m segments with signal_selection_source equal to zero. coordinates: delta_time lat_mean lon_mean |
| /quality_assessment/gt3r/delta_time: | Array of 64 bit Reals [ = 0..21] HDF5_OBJ_FULLPATH: /quality_assessment/gt3r/delta_time CLASS: DIMENSION_SCALE NAME: delta_time long_name: Elapsed GPS seconds standard_name: time units: seconds since 2018-01-01 source: Section 7.2, Q/A Statistics contentType: referenceInformation description: Mean number of GPS seconds since the ATLAS SDP epoch for the 10km segment. 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. coordinates: lat_mean lon_mean |
| /quality_assessment/gt3r/signal_selection_source_fraction_1: | Array of 32 bit Reals [ = 0..21] HDF5_OBJ_FULLPATH: /quality_assessment/gt3r/signal_selection_source_fraction_1 long_name: Signal Selection Source Fraction 1 units: 1 source: ATL06 ATBD - Q/A Statistics valid_min: 0. valid_max: 1. contentType: qualityInformation description: The fraction of 20m segments with signal_selection_source equal to 1. coordinates: delta_time lat_mean lon_mean |
| /quality_assessment/gt3r/lon_mean: | Array of 64 bit Reals [ = 0..21] HDF5_OBJ_FULLPATH: /quality_assessment/gt3r/lon_mean long_name: Longitude Mean standard_name: longitude units: degrees_east source: Section 7.2, Q/A Statistics valid_min: -180. valid_max: 180. contentType: physicalMeasurement description: Mean longitude of the 10km segment. coordinates: delta_time lat_mean |
| /quality_assessment/gt3r/signal_selection_source_fraction_2: | Array of 32 bit Reals [ = 0..21] HDF5_OBJ_FULLPATH: /quality_assessment/gt3r/signal_selection_source_fraction_2 long_name: Signal Selection Source Fraction 2 units: 1 source: ATL06 ATBD - Q/A Statistics valid_min: 0. valid_max: 1. contentType: qualityInformation description: The fraction of 20m segments with signal_selection_source equal to 2. coordinates: delta_time lat_mean lon_mean |
| /quality_assessment/gt3r/lat_mean: | Array of 64 bit Reals [ = 0..21] HDF5_OBJ_FULLPATH: /quality_assessment/gt3r/lat_mean long_name: Latitude Mean standard_name: latitude units: degrees_north source: Section 7.2, Q/A Statistics valid_min: -90. valid_max: 90. contentType: physicalMeasurement description: Mean latitude of the 10km segment. coordinates: delta_time lon_mean |
| /quality_assessment/gt3r/signal_selection_source_fraction_3: | Array of 32 bit Reals [ = 0..21] HDF5_OBJ_FULLPATH: /quality_assessment/gt3r/signal_selection_source_fraction_3 long_name: Signal Selection Source Fraction 3 units: 1 source: ATL06 ATBD - Q/A Statistics valid_min: 0. valid_max: 1. contentType: qualityInformation description: The fraction of 20m segments with signal_selection_source equal to 3. coordinates: delta_time lat_mean lon_mean |
| /METADATA/iso_19139_dataset_xml: | Array of Strings [ = 0..0] HDF5_OBJ_FULLPATH: /METADATA/iso_19139_dataset_xml long_name: ISO 19139 Dataset XML description: ISO 19139 Dataset XML |
| /METADATA/iso_19139_series_xml: | Array of Strings [ = 0..0] HDF5_OBJ_FULLPATH: /METADATA/iso_19139_series_xml long_name: ISO 19139 Series XML description: ISO 19139 Series XML |
| /orbit_info/rgt: | Array of 16 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /orbit_info/rgt long_name: Reference Ground track units: counts source: POD/PPD valid_min: 1 valid_max: 1387 contentType: referenceInformation 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 GT2L and GT2R. During slews or off-pointing, it is possible that ground tracks may intersect the RGT. The ICESat-2 mission has 1387 RGTs. coordinates: crossing_time |
| /orbit_info/bounding_polygon_lat1: | Array of 64 bit Reals [ = 0..4] HDF5_OBJ_FULLPATH: /orbit_info/bounding_polygon_lat1 long_name: Polygon1 Latitude units: degrees_north source: geo_poly valid_min: -90. valid_max: 90. contentType: auxiliaryInformation description: Latitude values for the first out of two possible bounding polygons |
| /orbit_info/cycle_number: | Array of 16 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /orbit_info/cycle_number long_name: Cycle Number units: counts source: POD/PPD valid_min: 0 valid_max: 50 contentType: referenceInformation description: Tracks the number of 91-day cycles in the mission, beginning with 01. A unique orbit number can be determined by subtracting 1 from the cycle_number, multiplying by 1387 and adding the rgt value. coordinates: crossing_time |
| /orbit_info/crossing_time: | Array of 64 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /orbit_info/crossing_time CLASS: DIMENSION_SCALE NAME: crossing_time long_name: Ascending Node Crossing Time standard_name: time units: seconds since 2018-01-01 source: POD/PPD 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. |
| /orbit_info/lan: | Array of 64 bit Reals [ = 0..0] HDF5_OBJ_FULLPATH: /orbit_info/lan long_name: Ascending Node Longitude units: degrees_east source: POD/PPD valid_min: -180. valid_max: 180. contentType: referenceInformation description: Longitude at the ascending node crossing. coordinates: crossing_time |
| /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 long_name: Time of Last Spacecraft Orientation Change standard_name: time units: seconds since 2018-01-01 source: POD/PPD 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. |
| /orbit_info/orbit_number: | Array of 16 bit Unsigned integers [ = 0..0] HDF5_OBJ_FULLPATH: /orbit_info/orbit_number long_name: Orbit Number units: 1 source: POD/PPD valid_min: 1 valid_max: 65000 contentType: referenceInformation description: Unique identifying number for each planned ICESat-2 orbit. coordinates: crossing_time |
| /orbit_info/bounding_polygon_lon1: | Array of 64 bit Reals [ = 0..4] HDF5_OBJ_FULLPATH: /orbit_info/bounding_polygon_lon1 long_name: Polygon1 Longitude units: degrees_east source: geo_poly valid_min: -180. valid_max: 180. contentType: auxiliaryInformation description: Longitude values for the first out of two possible bounding polygons |
| /orbit_info/sc_orient: | Array of 16 bit Integers [ = 0..0] HDF5_OBJ_FULLPATH: /orbit_info/sc_orient long_name: Spacecraft Orientation units: 1 source: POD/PPD valid_min: 0 valid_max: 2 contentType: referenceInformation 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. coordinates: sc_orient_time flag_meanings: backward forward transition flag_values: 0, 1, 2 |
| /gt3l/land_ice_segments/sigma_geo_h: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/sigma_geo_h _FillValue: 3.402823466e+38 long_name: Vertical Geolocation Error units: meters source: ATL06 ATBD - Segment Geolocation contentType: qualityInformation description: Total vertical geolocation error due to PPD and POD, including the effects of horizontal geolocation error on the segment vertical error. coordinates: delta_time latitude longitude |
| /gt3l/land_ice_segments/h_li_sigma: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/h_li_sigma _FillValue: 3.402823466e+38 long_name: Expected RMS segment misfit units: meters source: ATL06 ATBD - Top Level Fitting Routine contentType: qualityInformation description: Propagated error due to sampling error and FPB correction from the land ice algorithm coordinates: delta_time latitude longitude |
| /gt3l/land_ice_segments/fit_statistics/h_mean: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/fit_statistics/h_mean _FillValue: 3.402823466e+38 long_name: Height Mean units: meters source: ATL06 ATBD - Iterative Least-Squares Fitting Routine contentType: modelResult description: Mean surface height, not corrected for first-photon bias or pulse truncation. coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/fit_statistics/signal_selection_source: | Array of 16 bit Integers [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/fit_statistics/signal_selection_source long_name: Signal Selection Source units: 1 source: ATL06 ATBD - Signal Selection based on ATL03 flags valid_min: 0 valid_max: 3 contentType: qualityInformation description: Indicates the last algorithm attempted to select the signal for ATL06 fitting. 0=Signal selection succeeded using ATL03 detected PE; 1=Signal selection failed using ATL03 detected PE but succeeded using all flagged ATL03 PE; 2=Signal selection failed using all flagged ATL03 PE, but succeeded using the backup algorithm; 3=All signal-finding strategies failed. coordinates: ../delta_time ../latitude ../longitude flag_meanings: succeeded_using_pe succeeded_using_flagged_pe succeeded_using_backup failed flag_values: 0, 1, 2, 3 |
| /gt3l/land_ice_segments/fit_statistics/snr: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/fit_statistics/snr _FillValue: 3.402823466e+38 long_name: SNR units: 1 source: ATL06 ATBD - Iterative Least Squares Fitting Routine contentType: physicalMeasurement description: Signal-to-noise ratio in the final refined window coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/fit_statistics/h_robust_sprd: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/fit_statistics/h_robust_sprd _FillValue: 3.402823466e+38 long_name: Robust Spread units: meters source: ATL06 ATBD - Iterative Least-Squares Fitting Routine contentType: referenceInformation description: RDE of misfit between PE heights and the along-track segment fit. coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/fit_statistics/n_seg_pulses: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/fit_statistics/n_seg_pulses units: counts _FillValue: 3.402823466e+38 long_name: Number potential segment pulses source: ATL06 ATBD - Top-Level Fitting Routine contentType: referenceInformation description: The number of pulses potentially included in the segment coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/fit_statistics/dh_fit_dx_sigma: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/fit_statistics/dh_fit_dx_sigma _FillValue: 3.402823466e+38 long_name: Sigma of Along Track Slope units: meters/meters source: ATL06 ATBD - Iterative Least-Squares Fitting Routine contentType: qualityInformation description: Propagated error in the along-track segment slope coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/fit_statistics/snr_significance: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/fit_statistics/snr_significance _FillValue: 3.402823466e+38 long_name: SNR Significance units: 1 source: ATL06 ATBD - Top-Level Fitting Routine contentType: physicalMeasurement description: Probability that signal-finding routine would converge to at least the observed SNR for a random-noise input. Small values indicate a small likelihood of a surface-detection blunder. coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/fit_statistics/h_expected_rms: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/fit_statistics/h_expected_rms _FillValue: 3.402823466e+38 long_name: Expected RMS misfit units: meters source: ATL06 ATBD - Iterative ground-window refinement contentType: qualityInformation description: Expected RMS misfit between PE heights and along-track segment fit coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/fit_statistics/dh_fit_dy: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/fit_statistics/dh_fit_dy _FillValue: 3.402823466e+38 long_name: Across Track Slope units: meters/meters source: ATL06 ATBD - Top-Level Fitting Routine contentType: physicalMeasurement description: Across track slope from segment fits to weak and strong beam; the same slope is reported for both laser beams in each pair coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/fit_statistics/sigma_h_mean: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/fit_statistics/sigma_h_mean _FillValue: 3.402823466e+38 long_name: Height Error units: meters source: ATL06 ATBD - Propagated Height Errors contentType: qualityInformation description: Propagated height error due to PE-height sampling error for height from the along-track fit, not including geolocation-induced error coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/fit_statistics/h_rms_misfit: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/fit_statistics/h_rms_misfit _FillValue: 3.402823466e+38 long_name: RMS Misfit units: meters source: ATL06 ATBD -Iterative Least-Squares Fitting Routine contentType: qualityInformation description: RMS misfit between PE heights and along- track segment fit coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/fit_statistics/signal_selection_source_status: | Array of 16 bit Integers [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/fit_statistics/signal_selection_source_status long_name: Signal Selection Source Status units: 1 source: ATL06 ATBD - Signal Selection based on ATL03 flags valid_min: 0 valid_max: 4 contentType: qualityInformation description: Indicates the status of the last signal selection algorithm attempted (see signal_selection_source). The definition of flag is different for each source and are defined in each of the signal_selection_status flags. (See Land Ice ATBD Table 3-2). coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/fit_statistics/dh_fit_dx: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/fit_statistics/dh_fit_dx _FillValue: 3.402823466e+38 long_name: Along Track Slope units: meters/meters source: ATL06 ATBD - Iterative Least-Squares Fitting Routine contentType: physicalMeasurement description: Along-track slope from along-track segment fit coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/fit_statistics/n_fit_photons: | Array of 32 bit Integers [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/fit_statistics/n_fit_photons _FillValue: 2147483647 long_name: Number of Photons in Fit units: 1 source: ATL06 ATBD - Iterative Least-Squares Fitting Routine contentType: physicalMeasurement description: Number of PEs used in determining h_li, after editing coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/fit_statistics/w_surface_window_final: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/fit_statistics/w_surface_window_final _FillValue: 3.402823466e+38 long_name: Surface Window Width units: meters source: ATL06 ATBD - Top-Level Fitting Routine contentType: physicalMeasurement description: Width of the surface window, top to bottom coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/longitude: | Array of 64 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/longitude long_name: Longitude standard_name: longitude units: degrees_east source: ATL06 ATBD - Top Level Fitting Routine valid_min: -180. valid_max: 180. contentType: physicalMeasurement description: Longitude of segment center, , WGS84, East=+ coordinates: delta_time latitude |
| /gt3l/land_ice_segments/latitude: | Array of 64 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/latitude long_name: Latitude standard_name: latitude units: degrees_north source: ATL06 ATBD - Top Level Fitting Routine valid_min: -90. valid_max: 90. contentType: physicalMeasurement description: Latitude of segment center, WGS84, North=+, coordinates: delta_time longitude |
| /gt3l/land_ice_segments/h_li: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/h_li _FillValue: 3.402823466e+38 long_name: Land Ice height units: meters source: ATL06 ATBD - Top Level Fitting Routine contentType: physicalMeasurement description: Standard land-ice segment height determined by land ice algorithm, corrected for first-photon bias, representing the median- based height of the selected PEs coordinates: delta_time latitude longitude |
| /gt3l/land_ice_segments/ground_track/sigma_geo_at: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/ground_track/sigma_geo_at _FillValue: 3.402823466e+38 long_name: Along Track Geolocation Error units: meters source: ATL06 ATBD - Segment Geolocation contentType: qualityInformation description: Along-track component of the geolocation error. coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/ground_track/ref_azimuth: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/ground_track/ref_azimuth _FillValue: 3.402823466e+38 long_name: Azimuth units: degrees source: ATL03 contentType: referenceInformation 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). coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/ground_track/sigma_geo_r: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/ground_track/sigma_geo_r _FillValue: 3.402823466e+38 long_name: Radial Orbit Error units: meters source: ATL06 ATBD - Segment Geolocation contentType: qualityInformation description: Radial orbit component of the geolocation error. coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/ground_track/seg_azimuth: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/ground_track/seg_azimuth _FillValue: 3.402823466e+38 long_name: Segment Azimuth units: degrees source: ATL03 contentType: referenceInformation description: Azimuth of the pair-track, east of local north. coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/ground_track/sigma_geo_xt: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/ground_track/sigma_geo_xt _FillValue: 3.402823466e+38 long_name: Across Track Geolocation Error units: meters source: ATL06 ATBD - Segment Geolocation contentType: qualityInformation description: Across-track component of the geolocation error. coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/ground_track/ref_coelv: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/ground_track/ref_coelv _FillValue: 3.402823466e+38 long_name: Co-elevation units: degrees source: ATL03 contentType: referenceInformation description: Coelevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot. coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/ground_track/x_atc: | Array of 64 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/ground_track/x_atc _FillValue: 1.7976931348623157e+308 long_name: X Along Track units: meters source: ATL06 ATBD - Local Coordinate Systems contentType: referenceInformation description: The along-track x-coordinate of the segment, measured parallel to the RGT, measured from the ascending node of the equatorial crossing of a given RGT. coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/ground_track/y_atc: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/ground_track/y_atc _FillValue: 3.402823466e+38 long_name: Y Along Track units: meters source: ATL06 ATBD - Local Coordinate Systems contentType: referenceInformation description: Along-track y coordinate of the segment, relative to the RGT, measured along the perpendicular to the RGT, positive to the right of the RGT. coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/dem/dem_flag: | Array of 16 bit Integers [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/dem/dem_flag long_name: DEM Source Flag units: 1 source: ATL03 valid_min: 0 valid_max: 4 contentType: referenceInformation description: Indicates source of the DEM height. Values: 0=None, 1=Arctic, 2=Global, 3=MSS, 4=Antarctic. coordinates: ../delta_time ../latitude ../longitude flag_meanings: none arctic global mss antarctic flag_values: 0, 1, 2, 3, 4 |
| /gt3l/land_ice_segments/dem/geoid_free2mean: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/dem/geoid_free2mean _FillValue: 3.402823466e+38 long_name: Geoid Free-to-Mean conversion units: meters source: ATL03 contentType: modelResult description: Additive value to convert geoid heights from the tide-free system to the mean-tide system. (Add to geoid to get the geoid heights in the mean-tide system.) coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/dem/dem_h: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/dem/dem_h _FillValue: 3.402823466e+38 long_name: DEM Height units: meters source: ATL03 contentType: referenceInformation description: Height of the DEM, interpolated by cubic-spline interpolation in the DEM coordinate system to the PE location. (Best available DEM value in priority of Arctic/Antarctic/Global/MSS) coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/dem/geoid_h: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/dem/geoid_h _FillValue: 3.402823466e+38 long_name: Geoid Height units: meters source: ATL03 contentType: referenceInformation description: Geoid height above WGS-84 reference ellipsoid (range -107 to 86m) in the tide-free system. coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/geophysical/msw_flag: | Array of 16 bit Integers [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/geophysical/msw_flag _FillValue: 127 long_name: Multiple Scattering Warning Flag units: 1 source: ATL09 valid_min: -1 valid_max: 5 contentType: referenceInformation 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. coordinates: ../delta_time ../latitude ../longitude 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 |
| /gt3l/land_ice_segments/geophysical/layer_flag: | Array of 16 bit Integers [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/geophysical/layer_flag units: 1 source: ATL09 _FillValue: 127 long_name: Consolidated cloud flag valid_min: 0 valid_max: 1 contentType: referenceInformation 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. coordinates: ../delta_time ../latitude ../longitude flag_meanings: likely_clear likely_cloudy flag_values: 0, 1 |
| /gt3l/land_ice_segments/geophysical/bsnow_conf: | Array of 16 bit Integers [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/geophysical/bsnow_conf _FillValue: 127 long_name: Blowing Snow confidence units: 1 source: ATL09 contentType: referenceInformation description: Confidence flag for presence of blowing snow coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/geophysical/bsnow_h: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/geophysical/bsnow_h _FillValue: 3.402823466e+38 long_name: Blowing Snow Layer Top Height units: meters source: ATL09 contentType: referenceInformation description: Blowing snow layer top height coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/geophysical/tide_ocean: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/geophysical/tide_ocean _FillValue: 3.402823466e+38 long_name: Ocean Tide units: meters source: ATL03 contentType: referenceInformation description: Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium). coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/geophysical/tide_earth: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/geophysical/tide_earth _FillValue: 3.402823466e+38 long_name: Earth Tide units: meters source: ATL03 contentType: referenceInformation description: Solid earth tides in the tide-free system. coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/geophysical/solar_azimuth: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/geophysical/solar_azimuth _FillValue: 3.402823466e+38 long_name: solar azimuth units: degrees_east source: ATL03 contentType: referenceInformation description: The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot. coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/geophysical/r_eff: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/geophysical/r_eff _FillValue: 3.402823466e+38 long_name: Effective uncorrected reflectance units: 1 source: ATL06 ATBD - Top-Level Fitting Routine contentType: referenceInformation description: Effective reflectance, uncorrected for atmospheric effects. coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/geophysical/dac: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/geophysical/dac _FillValue: 3.402823466e+38 long_name: Dynamic Atmosphere Correction units: meters source: ATL03 contentType: referenceInformation description: Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect. coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/geophysical/tide_load: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/geophysical/tide_load _FillValue: 3.402823466e+38 long_name: Load Tide units: meters source: ATL03 contentType: referenceInformation description: Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm). coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/geophysical/tide_earth_free2mean: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/geophysical/tide_earth_free2mean _FillValue: 3.402823466e+38 long_name: Earth Tide Free-to-Mean conversion units: meters source: ATL03 contentType: referenceInformation description: Additive value to convert solid earth tide from the tide-free system to the mean tide system. (Add to tide_earth to get solid earth tides in the mean-tide system.) coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/geophysical/bsnow_od: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/geophysical/bsnow_od _FillValue: 3.402823466e+38 long_name: Blowing snow OD units: 1 source: ATL09 contentType: modelResult description: Optical thickness of blowing snow layer. coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/geophysical/tide_equilibrium: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/geophysical/tide_equilibrium _FillValue: 3.402823466e+38 long_name: Equilibrium Tide units: meters source: ATL03 contentType: referenceInformation description: Long period equilibrium tide self-consistent with the ocean tide model (+-0.04m). coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/geophysical/cloud_flg_atm: | Array of 16 bit Integers [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/geophysical/cloud_flg_atm _FillValue: 127 long_name: Cloud Flag ATM units: 1 source: ATL09 valid_min: 0 valid_max: 10 contentType: referenceInformation description: Number of layers found from the backscatter profile using the DDA layer finder. coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/geophysical/solar_elevation: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/geophysical/solar_elevation _FillValue: 3.402823466e+38 long_name: solar elevation units: degrees source: ATL03 valid_min: -90. valid_max: 90. contentType: referenceInformation 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. coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/geophysical/tide_pole: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/geophysical/tide_pole _FillValue: 3.402823466e+38 long_name: Solid Earth Pole Tide units: meters source: ATL03 contentType: referenceInformation description: Solid Earth Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm). coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/geophysical/e_bckgrd: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/geophysical/e_bckgrd _FillValue: 3.402823466e+38 long_name: Expected background count rate units: hz source: ATL06 ATBD - Background PE Rate contentType: referenceInformation description: Expected background count rate based on sun angle, surface slope, for unit surface reflectance coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/geophysical/cloud_flg_asr: | Array of 16 bit Integers [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/geophysical/cloud_flg_asr _FillValue: 127 long_name: Cloud Flag ASR units: 1 source: ATL09 valid_min: 0 valid_max: 5 contentType: referenceInformation 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 coordinates: ../delta_time ../latitude ../longitude 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 flag_values: 0, 1, 2, 3, 4, 5 |
| /gt3l/land_ice_segments/geophysical/bckgrd: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/geophysical/bckgrd _FillValue: 3.402823466e+38 long_name: Background count rate units: hz source: ATL03 contentType: referenceInformation description: Background count rate, derived from the ATL03 50-shot-average, interpolated to the segment center. coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/geophysical/neutat_delay_total: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/geophysical/neutat_delay_total _FillValue: 3.402823466e+38 long_name: Total Neutral Atmospheric Delay units: meters source: ATL03 contentType: referenceInformation description: Total neutral atmosphere delay correction (wet+dry). coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/atl06_quality_summary: | Array of 16 bit Integers [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/atl06_quality_summary long_name: ATL06_Quality_Summary units: 1 source: ATL06 ATBD - Top Level Fitting Routine valid_min: 0 valid_max: 1 contentType: qualityInformation description: The ATL06_quality_summary parameter indicates the best-quality subset of all ATL06 data. A zero in this parameter implies that no data-quality tests have found a problem with the segment, a one implies that some potential problem has been found. Users who select only segments with zero values for this flag can be relatively certain of obtaining high-quality data, but will likely miss a significant fraction of usable data, particularly in cloudy, rough, or low-surface-reflectance conditions. coordinates: delta_time latitude longitude flag_meanings: best_quality potential_problem flag_values: 0, 1 |
| /gt3l/land_ice_segments/segment_id: | Array of 32 bit Integers [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/segment_id _FillValue: 0 long_name: Reference Point, m units: 1 source: ATL06 ATBD - Top Level Fitting Routine contentType: referenceInformation description: Segment number, counting from the equator. Equal to the segment_id for the second of the two 20m ATL03 segments included in the 40m ATL06 segment coordinates: delta_time latitude longitude |
| /gt3l/land_ice_segments/delta_time: | Array of 64 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/delta_time CLASS: DIMENSION_SCALE NAME: delta_time long_name: Elapsed GPS seconds standard_name: time units: seconds since 2018-01-01 source: ATL06 ATBD - Top Level Fitting Routine contentType: referenceInformation 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. coordinates: latitude longitude |
| /gt3l/land_ice_segments/bias_correction/fpb_mean_corr_sigma: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/bias_correction/fpb_mean_corr_sigma units: meters _FillValue: 3.402823466e+38 long_name: fpb mean corr sigma source: ATL06 ATBD - First-Photon Bias Correction contentType: qualityInformation description: Estimated error in fpb_mean_corr coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/bias_correction/fpb_med_corr_sigma: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/bias_correction/fpb_med_corr_sigma _FillValue: 3.402823466e+38 long_name: fpb median corr sigma units: meters source: ATL06 ATBD - First-Photon Bias Correction contentType: qualityInformation description: Estimated error in fpb_med_corr coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/bias_correction/fpb_mean_corr: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/bias_correction/fpb_mean_corr _FillValue: 3.402823466e+38 long_name: first photon bias mean correction units: meters source: ATL06 ATBD - First-Photon Bias Correction contentType: qualityInformation description: Estimated first-photon bias (fpb) correction to mean segment height coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/bias_correction/med_r_fit: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/bias_correction/med_r_fit _FillValue: 3.402823466e+38 long_name: mean median residual units: meters source: ATL06 ATBD - Top-Level Fitting Routine contentType: qualityInformation description: Difference between uncorrected mean and median of linear fit residuals coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/bias_correction/fpb_med_corr: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/bias_correction/fpb_med_corr _FillValue: 3.402823466e+38 long_name: fpb median corr units: meters source: ATL06 ATBD - First-Photon Bias Correction contentType: qualityInformation description: First-photon-bias correction giving the difference between the mean segment height and the corrected median height coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/bias_correction/tx_mean_corr: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/bias_correction/tx_mean_corr _FillValue: 3.402823466e+38 long_name: tx shape mean correction units: meters source: ATL06 ATBD - Transmit-pulse shape correction contentType: qualityInformation description: Estimate of the difference between the mean of the full-waveform transmit-pulse and the mean of a broadened, truncated waveform consistent with the received pulse coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/bias_correction/fpb_n_corr: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/bias_correction/fpb_n_corr _FillValue: 3.402823466e+38 long_name: fpb number photons corr units: counts source: ATL06 ATBD - First-Photon Bias Correction contentType: qualityInformation description: Estimated window photon count after first-photon-bias correction coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/bias_correction/tx_med_corr: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/bias_correction/tx_med_corr _FillValue: 3.402823466e+38 long_name: tx shape median correction units: meters source: ATL06 ATBD - Transmit-pulse shape correction contentType: qualityInformation description: Estimate of the difference between the median of the full-waveform transmit-pulse mean and the median of a broadened, truncated waveform consistent with the received pulse coordinates: ../delta_time ../latitude ../longitude |
| /gt3l/land_ice_segments/fpb_warning_flag: | Array of 16 bit Integers [ = 0..187] HDF5_OBJ_FULLPATH: /gt3l/land_ice_segments/fpb_warning_flag long_name: fpb_warning_flag units: 1 source: ATL06 ATBD - FPB Corrections valid_min: 0 valid_max: 1 contentType: qualityInformation description: To flag that segments have potentially erroneous FPB corrections, the ATL06 algorithm sets fpb_warning_flag to 1 if full_sat_fract is greater than 0.90 (strong beams) or greater than 0.40 (weak beams) for either of the two ATL03 20 m segments that are used as inputs to each ATL06 40 m segment. Otherwise, fpb_warning_flag is set to 0. coordinates: latitude longitude delta_time flag_meanings: best_quality potential_problem flag_values: 0, 1 |
| /gt3l/residual_histogram/count: | Array of 32 bit Integers [ = 0..15][ = 0..747] HDF5_OBJ_FULLPATH: /gt3l/residual_histogram/count _FillValue: 2147483647 long_name: Bin Counts units: counts source: ATL06 ATBD - Residual_histogram calculation contentType: physicalMeasurement description: Residual count falling with each histogram bin. The top height of each histogram bin may be found in the bin_top_h dataset. coordinates: delta_time lat_mean lon_mean |
| /gt3l/residual_histogram/lat_mean: | Array of 64 bit Reals [ = 0..15] HDF5_OBJ_FULLPATH: /gt3l/residual_histogram/lat_mean long_name: Latitude Mean standard_name: latitude units: degrees_north source: ATL06 ATBD - Residual_histogram calculation valid_min: -90. valid_max: 90. contentType: physicalMeasurement description: Mean latitude of the segments included in the histogram coordinates: delta_time lon_mean |
| /gt3l/residual_histogram/x_atc_mean: | Array of 64 bit Reals [ = 0..15] HDF5_OBJ_FULLPATH: /gt3l/residual_histogram/x_atc_mean long_name: Along Track Coordinate Mean units: 1 source: ATL06 ATBD - Residual_histogram calculation contentType: physicalMeasurement description: Mean along-track coordinate of the segments included in the histogram. coordinates: delta_time lat_mean lon_mean |
| /gt3l/residual_histogram/segment_id_list: | Array of 32 bit Integers [ = 0..15][ = 0..9] HDF5_OBJ_FULLPATH: /gt3l/residual_histogram/segment_id_list long_name: Segment ID List units: 1 source: ATL06 ATBD - Residual_histogram calculation contentType: referenceInformation description: Segments ids included in each column of the histogram coordinates: delta_time lat_mean lon_mean _FillValue: 2147483647 |
| /gt3l/residual_histogram/bckgrd_per_m: | Array of 32 bit Reals [ = 0..15] HDF5_OBJ_FULLPATH: /gt3l/residual_histogram/bckgrd_per_m long_name: Expected background PEs units: 1 source: ATL06 ATBD - Residual_histogram calculation contentType: physicalMeasurement description: Number of background PE expected for each vertical meter of the histogram based on the observed background rate (bckgrd). coordinates: delta_time lat_mean lon_mean |
| /gt3l/residual_histogram/ds_segment_id: | Array of 16 bit Integers [ = 0..9] HDF5_OBJ_FULLPATH: /gt3l/residual_histogram/ds_segment_id CLASS: DIMENSION_SCALE NAME: ds_segment_id long_name: Segment ID Index units: 1 source: ATL06 ATBD - Residual_histogram calculation valid_min: 1 valid_max: 10 contentType: auxiliaryInformation description: Relative index of each segment_id used in the derivation of the histogram. |
| /gt3l/residual_histogram/pulse_count: | Array of 32 bit Reals [ = 0..15] HDF5_OBJ_FULLPATH: /gt3l/residual_histogram/pulse_count long_name: Number of Histogram Segment Pulses units: counts source: ATL06 ATBD - Residual_histogram calculation contentType: physicalMeasurement description: Number of pulses potentially included in the histogram (pulses are counted if they are in the central 20 m of each segment, even if no PE from the pulse are selected). coordinates: delta_time lat_mean lon_mean |
| /gt3l/residual_histogram/lon_mean: | Array of 64 bit Reals [ = 0..15] HDF5_OBJ_FULLPATH: /gt3l/residual_histogram/lon_mean long_name: Longitude Mean standard_name: longitude units: degrees_east source: ATL06 ATBD - Residual_histogram calculation valid_min: -180. valid_max: 180. contentType: physicalMeasurement description: Mean longitude of the segments included in the histogram coordinates: delta_time lat_mean |
| /gt3l/residual_histogram/delta_time: | Array of 64 bit Reals [ = 0..15] HDF5_OBJ_FULLPATH: /gt3l/residual_histogram/delta_time CLASS: DIMENSION_SCALE NAME: delta_time long_name: Elapsed GPS seconds standard_name: time units: seconds since 2018-01-01 source: ATL06 ATBD - Residual_histogram calculation contentType: referenceInformation 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. coordinates: lat_mean lon_mean |
| /gt3l/residual_histogram/bin_top_h: | Array of 32 bit Reals [ = 0..747] HDF5_OBJ_FULLPATH: /gt3l/residual_histogram/bin_top_h CLASS: DIMENSION_SCALE NAME: bin_top_h long_name: Bin Top Height units: meters source: ATL06 ATBD - Residual_histogram calculation contentType: physicalMeasurement description: Height of the top of each histogram bin, listed in increasing order. The bottom of each bin is equal to the top of the next- lowest bin. coordinates: delta_time lat_mean lon_mean |
| /gt3l/segment_quality/reference_pt_lat: | Array of 64 bit Reals [ = 0..201] HDF5_OBJ_FULLPATH: /gt3l/segment_quality/reference_pt_lat long_name: Latitude units: degrees_north source: ATL06 ATBD - segment_quality group valid_min: -90. valid_max: 90. contentType: referenceInformation description: Latitude of the reference segment location on the RPT coordinates: delta_time reference_pt_lon standard_name: latitude |
| /gt3l/segment_quality/reference_pt_lon: | Array of 64 bit Reals [ = 0..201] HDF5_OBJ_FULLPATH: /gt3l/segment_quality/reference_pt_lon long_name: Longitude units: degrees_east source: ATL06 ATBD - segment_quality group valid_min: -180. valid_max: 180. contentType: referenceInformation description: Longitude of the reference segment location on the RPT coordinates: delta_time reference_pt_lat standard_name: longitude |
| /gt3l/segment_quality/segment_id: | Array of 32 bit Integers [ = 0..201] HDF5_OBJ_FULLPATH: /gt3l/segment_quality/segment_id long_name: Reference Point, m units: 1 source: ATL06 ATBD - segment_quality group contentType: referenceInformation description: Segment number corresponding to the second of two ATL03 segments in the ATL06 segment, counted from the RGT equator crossing coordinates: delta_time reference_pt_lat reference_pt_lon |
| /gt3l/segment_quality/record_number: | Array of 32 bit Integers [ = 0..201] HDF5_OBJ_FULLPATH: /gt3l/segment_quality/record_number long_name: Land Ice Height Index units: 1 source: ATL06 ATBD - segment_quality group contentType: referenceInformation description: For those segments that have adequate signal strength, this parameter gives the record for the pair within the other groups in the granule. coordinates: delta_time reference_pt_lat reference_pt_lon |
| /gt3l/segment_quality/signal_selection_source: | Array of 16 bit Integers [ = 0..201] HDF5_OBJ_FULLPATH: /gt3l/segment_quality/signal_selection_source long_name: Signal Selection Source units: 1 source: ATL06 ATBD - Signal selection base on ATL03 flags valid_min: 0 valid_max: 3 contentType: qualityInformation description: Indicates the last algorithm attempted to select the signal for ATL06 fitting. 0=Signal selection succeeded using ATL03 detected PE; 1=Signal selection failed using ATL03 detected PE but succeeded using all flagged ATL03 PE; 3=All signal-finding strategies failed. coordinates: delta_time reference_pt_lat reference_pt_lon flag_meanings: succeeded_using_pe succeeded_using_flagged_pe failed flag_values: 0, 1, 3 |
| /gt3l/segment_quality/delta_time: | Array of 64 bit Reals [ = 0..201] HDF5_OBJ_FULLPATH: /gt3l/segment_quality/delta_time CLASS: DIMENSION_SCALE long_name: Elapsed GPS seconds standard_name: time units: seconds since 2018-01-01 source: ATL06 ATBD - segment_quality group contentType: referenceInformation 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. coordinates: reference_pt_lat reference_pt_lon NAME: delta_time |
| /gt3l/segment_quality/signal_selection_status/signal_selection_status_all: | Array of 16 bit Integers [ = 0..201] HDF5_OBJ_FULLPATH: /gt3l/segment_quality/signal_selection_status/signal_selection_status_all units: 1 long_name: Signal Selection Status Flag source: ATL06 ATBD - Signal selection base on ATL03 flags valid_min: 0 valid_max: 3 contentType: qualityInformation description: Indicates confidence of the signal-selection algorithm using all ATL03-flagged PEs. 0=Signal selection succeeded using all ATL03-flagged PEs (or algorithm not attempted); 1=Signal selection using all ATL03-flagged PEs failed the 20-meter-spread test; 2=Signal selection using all ATL03-flagged PEs failed the 10-photon-count test; 3=Signal selection using all ATL03-flagged PEs failed both tests coordinates: ../delta_time ../reference_pt_lat ../reference_pt_lon flag_meanings: succeeded failed_20 failed_10 failed_both flag_values: 0, 1, 2, 3 |
| /gt3l/segment_quality/signal_selection_status/signal_selection_status_confident: | Array of 16 bit Integers [ = 0..201] HDF5_OBJ_FULLPATH: /gt3l/segment_quality/signal_selection_status/signal_selection_status_confident units: 1 long_name: Signal Selection Confident Flag source: ATL06 ATBD - Signal selection base on ATL03 flags valid_min: 0 valid_max: 3 contentType: qualityInformation description: Indicates confidence of the signal-selection algorithm using low or better PEs. 0=Signal selection succeeded using ATL03 low-or-better confidence PEs; 1=Signal selection using ATL03 low-or-better confidence PEs failed the 20-meter-spread test; 2=Signal selection using ATL03 low-or-better confidence PEs failed the 10-photon-count test; 3=Signal selection using ATL03 low-or-better confidence PEs failed both tests coordinates: ../delta_time ../reference_pt_lat ../reference_pt_lon flag_meanings: succeeded failed_20 failed_10 failed_both flag_values: 0, 1, 2, 3 |
| /gt3r/land_ice_segments/sigma_geo_h: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/sigma_geo_h _FillValue: 3.402823466e+38 long_name: Vertical Geolocation Error units: meters source: ATL06 ATBD - Segment Geolocation contentType: qualityInformation description: Total vertical geolocation error due to PPD and POD, including the effects of horizontal geolocation error on the segment vertical error. coordinates: delta_time latitude longitude |
| /gt3r/land_ice_segments/h_li_sigma: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/h_li_sigma _FillValue: 3.402823466e+38 long_name: Expected RMS segment misfit units: meters source: ATL06 ATBD - Top Level Fitting Routine contentType: qualityInformation description: Propagated error due to sampling error and FPB correction from the land ice algorithm coordinates: delta_time latitude longitude |
| /gt3r/land_ice_segments/fit_statistics/h_mean: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/fit_statistics/h_mean _FillValue: 3.402823466e+38 long_name: Height Mean units: meters source: ATL06 ATBD - Iterative Least-Squares Fitting Routine contentType: modelResult description: Mean surface height, not corrected for first-photon bias or pulse truncation. coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/fit_statistics/signal_selection_source: | Array of 16 bit Integers [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/fit_statistics/signal_selection_source long_name: Signal Selection Source units: 1 source: ATL06 ATBD - Signal Selection based on ATL03 flags valid_min: 0 valid_max: 3 contentType: qualityInformation description: Indicates the last algorithm attempted to select the signal for ATL06 fitting. 0=Signal selection succeeded using ATL03 detected PE; 1=Signal selection failed using ATL03 detected PE but succeeded using all flagged ATL03 PE; 2=Signal selection failed using all flagged ATL03 PE, but succeeded using the backup algorithm; 3=All signal-finding strategies failed. coordinates: ../delta_time ../latitude ../longitude flag_meanings: succeeded_using_pe succeeded_using_flagged_pe succeeded_using_backup failed flag_values: 0, 1, 2, 3 |
| /gt3r/land_ice_segments/fit_statistics/snr: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/fit_statistics/snr _FillValue: 3.402823466e+38 long_name: SNR units: 1 source: ATL06 ATBD - Iterative Least Squares Fitting Routine contentType: physicalMeasurement description: Signal-to-noise ratio in the final refined window coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/fit_statistics/h_robust_sprd: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/fit_statistics/h_robust_sprd _FillValue: 3.402823466e+38 long_name: Robust Spread units: meters source: ATL06 ATBD - Iterative Least-Squares Fitting Routine contentType: referenceInformation description: RDE of misfit between PE heights and the along-track segment fit. coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/fit_statistics/n_seg_pulses: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/fit_statistics/n_seg_pulses units: counts _FillValue: 3.402823466e+38 long_name: Number potential segment pulses source: ATL06 ATBD - Top-Level Fitting Routine contentType: referenceInformation description: The number of pulses potentially included in the segment coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/fit_statistics/dh_fit_dx_sigma: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/fit_statistics/dh_fit_dx_sigma _FillValue: 3.402823466e+38 long_name: Sigma of Along Track Slope units: meters/meters source: ATL06 ATBD - Iterative Least-Squares Fitting Routine contentType: qualityInformation description: Propagated error in the along-track segment slope coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/fit_statistics/snr_significance: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/fit_statistics/snr_significance _FillValue: 3.402823466e+38 long_name: SNR Significance units: 1 source: ATL06 ATBD - Top-Level Fitting Routine contentType: physicalMeasurement description: Probability that signal-finding routine would converge to at least the observed SNR for a random-noise input. Small values indicate a small likelihood of a surface-detection blunder. coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/fit_statistics/h_expected_rms: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/fit_statistics/h_expected_rms _FillValue: 3.402823466e+38 long_name: Expected RMS misfit units: meters source: ATL06 ATBD - Iterative ground-window refinement contentType: qualityInformation description: Expected RMS misfit between PE heights and along-track segment fit coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/fit_statistics/dh_fit_dy: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/fit_statistics/dh_fit_dy _FillValue: 3.402823466e+38 long_name: Across Track Slope units: meters/meters source: ATL06 ATBD - Top-Level Fitting Routine contentType: physicalMeasurement description: Across track slope from segment fits to weak and strong beam; the same slope is reported for both laser beams in each pair coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/fit_statistics/sigma_h_mean: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/fit_statistics/sigma_h_mean _FillValue: 3.402823466e+38 long_name: Height Error units: meters source: ATL06 ATBD - Propagated Height Errors contentType: qualityInformation description: Propagated height error due to PE-height sampling error for height from the along-track fit, not including geolocation-induced error coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/fit_statistics/h_rms_misfit: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/fit_statistics/h_rms_misfit _FillValue: 3.402823466e+38 long_name: RMS Misfit units: meters source: ATL06 ATBD -Iterative Least-Squares Fitting Routine contentType: qualityInformation description: RMS misfit between PE heights and along- track segment fit coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/fit_statistics/signal_selection_source_status: | Array of 16 bit Integers [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/fit_statistics/signal_selection_source_status long_name: Signal Selection Source Status units: 1 source: ATL06 ATBD - Signal Selection based on ATL03 flags valid_min: 0 valid_max: 4 contentType: qualityInformation description: Indicates the status of the last signal selection algorithm attempted (see signal_selection_source). The definition of flag is different for each source and are defined in each of the signal_selection_status flags. (See Land Ice ATBD Table 3-2). coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/fit_statistics/dh_fit_dx: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/fit_statistics/dh_fit_dx _FillValue: 3.402823466e+38 long_name: Along Track Slope units: meters/meters source: ATL06 ATBD - Iterative Least-Squares Fitting Routine contentType: physicalMeasurement description: Along-track slope from along-track segment fit coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/fit_statistics/n_fit_photons: | Array of 32 bit Integers [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/fit_statistics/n_fit_photons _FillValue: 2147483647 long_name: Number of Photons in Fit units: 1 source: ATL06 ATBD - Iterative Least-Squares Fitting Routine contentType: physicalMeasurement description: Number of PEs used in determining h_li, after editing coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/fit_statistics/w_surface_window_final: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/fit_statistics/w_surface_window_final _FillValue: 3.402823466e+38 long_name: Surface Window Width units: meters source: ATL06 ATBD - Top-Level Fitting Routine contentType: physicalMeasurement description: Width of the surface window, top to bottom coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/longitude: | Array of 64 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/longitude long_name: Longitude standard_name: longitude units: degrees_east source: ATL06 ATBD - Top Level Fitting Routine valid_min: -180. valid_max: 180. contentType: physicalMeasurement description: Longitude of segment center, , WGS84, East=+ coordinates: delta_time latitude |
| /gt3r/land_ice_segments/latitude: | Array of 64 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/latitude long_name: Latitude standard_name: latitude units: degrees_north source: ATL06 ATBD - Top Level Fitting Routine valid_min: -90. valid_max: 90. contentType: physicalMeasurement description: Latitude of segment center, WGS84, North=+, coordinates: delta_time longitude |
| /gt3r/land_ice_segments/h_li: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/h_li _FillValue: 3.402823466e+38 long_name: Land Ice height units: meters source: ATL06 ATBD - Top Level Fitting Routine contentType: physicalMeasurement description: Standard land-ice segment height determined by land ice algorithm, corrected for first-photon bias, representing the median- based height of the selected PEs coordinates: delta_time latitude longitude |
| /gt3r/land_ice_segments/ground_track/sigma_geo_at: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/ground_track/sigma_geo_at _FillValue: 3.402823466e+38 long_name: Along Track Geolocation Error units: meters source: ATL06 ATBD - Segment Geolocation contentType: qualityInformation description: Along-track component of the geolocation error. coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/ground_track/ref_coelv: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/ground_track/ref_coelv _FillValue: 3.402823466e+38 long_name: Co-elevation units: degrees source: ATL03 contentType: referenceInformation description: Coelevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot. coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/ground_track/sigma_geo_r: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/ground_track/sigma_geo_r _FillValue: 3.402823466e+38 long_name: Radial Orbit Error units: meters source: ATL06 ATBD - Segment Geolocation contentType: qualityInformation description: Radial orbit component of the geolocation error. coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/ground_track/seg_azimuth: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/ground_track/seg_azimuth _FillValue: 3.402823466e+38 long_name: Segment Azimuth units: degrees source: ATL03 contentType: referenceInformation description: Azimuth of the pair-track, east of local north. coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/ground_track/sigma_geo_xt: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/ground_track/sigma_geo_xt _FillValue: 3.402823466e+38 long_name: Across Track Geolocation Error units: meters source: ATL06 ATBD - Segment Geolocation contentType: qualityInformation description: Across-track component of the geolocation error. coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/ground_track/ref_azimuth: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/ground_track/ref_azimuth _FillValue: 3.402823466e+38 long_name: Azimuth units: degrees source: ATL03 contentType: referenceInformation 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). coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/ground_track/x_atc: | Array of 64 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/ground_track/x_atc _FillValue: 1.7976931348623157e+308 long_name: X Along Track units: meters source: ATL06 ATBD - Local Coordinate Systems contentType: referenceInformation description: The along-track x-coordinate of the segment, measured parallel to the RGT, measured from the ascending node of the equatorial crossing of a given RGT. coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/ground_track/y_atc: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/ground_track/y_atc _FillValue: 3.402823466e+38 long_name: Y Along Track units: meters source: ATL06 ATBD - Local Coordinate Systems contentType: referenceInformation description: Along-track y coordinate of the segment, relative to the RGT, measured along the perpendicular to the RGT, positive to the right of the RGT. coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/dem/dem_flag: | Array of 16 bit Integers [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/dem/dem_flag long_name: DEM Source Flag units: 1 source: ATL03 valid_min: 0 valid_max: 4 contentType: referenceInformation description: Indicates source of the DEM height. Values: 0=None, 1=Arctic, 2=Global, 3=MSS, 4=Antarctic. coordinates: ../delta_time ../latitude ../longitude flag_meanings: none arctic global mss antarctic flag_values: 0, 1, 2, 3, 4 |
| /gt3r/land_ice_segments/dem/geoid_free2mean: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/dem/geoid_free2mean _FillValue: 3.402823466e+38 long_name: Geoid Free-to-Mean conversion units: meters source: ATL03 contentType: modelResult description: Additive value to convert geoid heights from the tide-free system to the mean-tide system. (Add to geoid to get the geoid heights in the mean-tide system.) coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/dem/dem_h: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/dem/dem_h _FillValue: 3.402823466e+38 long_name: DEM Height units: meters source: ATL03 contentType: referenceInformation description: Height of the DEM, interpolated by cubic-spline interpolation in the DEM coordinate system to the PE location. (Best available DEM value in priority of Arctic/Antarctic/Global/MSS) coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/dem/geoid_h: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/dem/geoid_h _FillValue: 3.402823466e+38 long_name: Geoid Height units: meters source: ATL03 contentType: referenceInformation description: Geoid height above WGS-84 reference ellipsoid (range -107 to 86m) in the tide-free system. coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/geophysical/msw_flag: | Array of 16 bit Integers [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/geophysical/msw_flag _FillValue: 127 long_name: Multiple Scattering Warning Flag units: 1 source: ATL09 valid_min: -1 valid_max: 5 contentType: referenceInformation 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. coordinates: ../delta_time ../latitude ../longitude 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 |
| /gt3r/land_ice_segments/geophysical/layer_flag: | Array of 16 bit Integers [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/geophysical/layer_flag units: 1 source: ATL09 _FillValue: 127 long_name: Consolidated cloud flag valid_min: 0 valid_max: 1 contentType: referenceInformation 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. coordinates: ../delta_time ../latitude ../longitude flag_meanings: likely_clear likely_cloudy flag_values: 0, 1 |
| /gt3r/land_ice_segments/geophysical/bsnow_conf: | Array of 16 bit Integers [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/geophysical/bsnow_conf _FillValue: 127 long_name: Blowing Snow confidence units: 1 source: ATL09 contentType: referenceInformation description: Confidence flag for presence of blowing snow coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/geophysical/bsnow_h: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/geophysical/bsnow_h _FillValue: 3.402823466e+38 long_name: Blowing Snow Layer Top Height units: meters source: ATL09 contentType: referenceInformation description: Blowing snow layer top height coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/geophysical/tide_ocean: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/geophysical/tide_ocean _FillValue: 3.402823466e+38 long_name: Ocean Tide units: meters source: ATL03 contentType: referenceInformation description: Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium). coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/geophysical/tide_earth: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/geophysical/tide_earth _FillValue: 3.402823466e+38 long_name: Earth Tide units: meters source: ATL03 contentType: referenceInformation description: Solid earth tides in the tide-free system. coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/geophysical/solar_azimuth: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/geophysical/solar_azimuth _FillValue: 3.402823466e+38 long_name: solar azimuth units: degrees_east source: ATL03 contentType: referenceInformation description: The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot. coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/geophysical/r_eff: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/geophysical/r_eff _FillValue: 3.402823466e+38 long_name: Effective uncorrected reflectance units: 1 source: ATL06 ATBD - Top-Level Fitting Routine contentType: referenceInformation description: Effective reflectance, uncorrected for atmospheric effects. coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/geophysical/dac: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/geophysical/dac _FillValue: 3.402823466e+38 long_name: Dynamic Atmosphere Correction units: meters source: ATL03 contentType: referenceInformation description: Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect. coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/geophysical/tide_load: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/geophysical/tide_load _FillValue: 3.402823466e+38 long_name: Load Tide units: meters source: ATL03 contentType: referenceInformation description: Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm). coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/geophysical/tide_earth_free2mean: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/geophysical/tide_earth_free2mean _FillValue: 3.402823466e+38 long_name: Earth Tide Free-to-Mean conversion units: meters source: ATL03 contentType: referenceInformation description: Additive value to convert solid earth tide from the tide-free system to the mean tide system. (Add to tide_earth to get solid earth tides in the mean-tide system.) coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/geophysical/bsnow_od: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/geophysical/bsnow_od _FillValue: 3.402823466e+38 long_name: Blowing snow OD units: 1 source: ATL09 contentType: modelResult description: Optical thickness of blowing snow layer. coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/geophysical/tide_equilibrium: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/geophysical/tide_equilibrium _FillValue: 3.402823466e+38 long_name: Equilibrium Tide units: meters source: ATL03 contentType: referenceInformation description: Long period equilibrium tide self-consistent with the ocean tide model (+-0.04m). coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/geophysical/cloud_flg_atm: | Array of 16 bit Integers [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/geophysical/cloud_flg_atm _FillValue: 127 long_name: Cloud Flag ATM units: 1 source: ATL09 valid_min: 0 valid_max: 10 contentType: referenceInformation description: Number of layers found from the backscatter profile using the DDA layer finder. coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/geophysical/solar_elevation: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/geophysical/solar_elevation _FillValue: 3.402823466e+38 long_name: solar elevation units: degrees source: ATL03 valid_min: -90. valid_max: 90. contentType: referenceInformation 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. coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/geophysical/tide_pole: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/geophysical/tide_pole _FillValue: 3.402823466e+38 long_name: Solid Earth Pole Tide units: meters source: ATL03 contentType: referenceInformation description: Solid Earth Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm). coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/geophysical/e_bckgrd: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/geophysical/e_bckgrd _FillValue: 3.402823466e+38 long_name: Expected background count rate units: hz source: ATL06 ATBD - Background PE Rate contentType: referenceInformation description: Expected background count rate based on sun angle, surface slope, for unit surface reflectance coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/geophysical/cloud_flg_asr: | Array of 16 bit Integers [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/geophysical/cloud_flg_asr _FillValue: 127 long_name: Cloud Flag ASR units: 1 source: ATL09 valid_min: 0 valid_max: 5 contentType: referenceInformation 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 coordinates: ../delta_time ../latitude ../longitude 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 flag_values: 0, 1, 2, 3, 4, 5 |
| /gt3r/land_ice_segments/geophysical/bckgrd: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/geophysical/bckgrd _FillValue: 3.402823466e+38 long_name: Background count rate units: hz source: ATL03 contentType: referenceInformation description: Background count rate, derived from the ATL03 50-shot-average, interpolated to the segment center. coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/geophysical/neutat_delay_total: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/geophysical/neutat_delay_total _FillValue: 3.402823466e+38 long_name: Total Neutral Atmospheric Delay units: meters source: ATL03 contentType: referenceInformation description: Total neutral atmosphere delay correction (wet+dry). coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/atl06_quality_summary: | Array of 16 bit Integers [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/atl06_quality_summary long_name: ATL06_Quality_Summary units: 1 source: ATL06 ATBD - Top Level Fitting Routine valid_min: 0 valid_max: 1 contentType: qualityInformation description: The ATL06_quality_summary parameter indicates the best-quality subset of all ATL06 data. A zero in this parameter implies that no data-quality tests have found a problem with the segment, a one implies that some potential problem has been found. Users who select only segments with zero values for this flag can be relatively certain of obtaining high-quality data, but will likely miss a significant fraction of usable data, particularly in cloudy, rough, or low-surface-reflectance conditions. coordinates: delta_time latitude longitude flag_meanings: best_quality potential_problem flag_values: 0, 1 |
| /gt3r/land_ice_segments/segment_id: | Array of 32 bit Integers [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/segment_id _FillValue: 0 long_name: Reference Point, m units: 1 source: ATL06 ATBD - Top Level Fitting Routine contentType: referenceInformation description: Segment number, counting from the equator. Equal to the segment_id for the second of the two 20m ATL03 segments included in the 40m ATL06 segment coordinates: delta_time latitude longitude |
| /gt3r/land_ice_segments/delta_time: | Array of 64 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/delta_time CLASS: DIMENSION_SCALE NAME: delta_time long_name: Elapsed GPS seconds standard_name: time units: seconds since 2018-01-01 source: ATL06 ATBD - Top Level Fitting Routine contentType: referenceInformation 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. coordinates: latitude longitude |
| /gt3r/land_ice_segments/bias_correction/fpb_mean_corr_sigma: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/bias_correction/fpb_mean_corr_sigma units: meters _FillValue: 3.402823466e+38 long_name: fpb mean corr sigma source: ATL06 ATBD - First-Photon Bias Correction contentType: qualityInformation description: Estimated error in fpb_mean_corr coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/bias_correction/fpb_med_corr_sigma: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/bias_correction/fpb_med_corr_sigma _FillValue: 3.402823466e+38 long_name: fpb median corr sigma units: meters source: ATL06 ATBD - First-Photon Bias Correction contentType: qualityInformation description: Estimated error in fpb_med_corr coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/bias_correction/fpb_mean_corr: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/bias_correction/fpb_mean_corr _FillValue: 3.402823466e+38 long_name: first photon bias mean correction units: meters source: ATL06 ATBD - First-Photon Bias Correction contentType: qualityInformation description: Estimated first-photon bias (fpb) correction to mean segment height coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/bias_correction/med_r_fit: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/bias_correction/med_r_fit _FillValue: 3.402823466e+38 long_name: mean median residual units: meters source: ATL06 ATBD - Top-Level Fitting Routine contentType: qualityInformation description: Difference between uncorrected mean and median of linear fit residuals coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/bias_correction/fpb_med_corr: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/bias_correction/fpb_med_corr _FillValue: 3.402823466e+38 long_name: fpb median corr units: meters source: ATL06 ATBD - First-Photon Bias Correction contentType: qualityInformation description: First-photon-bias correction giving the difference between the mean segment height and the corrected median height coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/bias_correction/tx_mean_corr: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/bias_correction/tx_mean_corr _FillValue: 3.402823466e+38 long_name: tx shape mean correction units: meters source: ATL06 ATBD - Transmit-pulse shape correction contentType: qualityInformation description: Estimate of the difference between the mean of the full-waveform transmit-pulse and the mean of a broadened, truncated waveform consistent with the received pulse coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/bias_correction/fpb_n_corr: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/bias_correction/fpb_n_corr _FillValue: 3.402823466e+38 long_name: fpb number photons corr units: counts source: ATL06 ATBD - First-Photon Bias Correction contentType: qualityInformation description: Estimated window photon count after first-photon-bias correction coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/bias_correction/tx_med_corr: | Array of 32 bit Reals [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/bias_correction/tx_med_corr _FillValue: 3.402823466e+38 long_name: tx shape median correction units: meters source: ATL06 ATBD - Transmit-pulse shape correction contentType: qualityInformation description: Estimate of the difference between the median of the full-waveform transmit-pulse mean and the median of a broadened, truncated waveform consistent with the received pulse coordinates: ../delta_time ../latitude ../longitude |
| /gt3r/land_ice_segments/fpb_warning_flag: | Array of 16 bit Integers [ = 0..187] HDF5_OBJ_FULLPATH: /gt3r/land_ice_segments/fpb_warning_flag long_name: fpb_warning_flag units: 1 source: ATL06 ATBD - FPB Corrections valid_min: 0 valid_max: 1 contentType: qualityInformation description: To flag that segments have potentially erroneous FPB corrections, the ATL06 algorithm sets fpb_warning_flag to 1 if full_sat_fract is greater than 0.90 (strong beams) or greater than 0.40 (weak beams) for either of the two ATL03 20 m segments that are used as inputs to each ATL06 40 m segment. Otherwise, fpb_warning_flag is set to 0. coordinates: latitude longitude delta_time flag_meanings: best_quality potential_problem flag_values: 0, 1 |
| /gt3r/residual_histogram/count: | Array of 32 bit Integers [ = 0..21][ = 0..747] HDF5_OBJ_FULLPATH: /gt3r/residual_histogram/count _FillValue: 2147483647 long_name: Bin Counts units: counts source: ATL06 ATBD - Residual_histogram calculation contentType: physicalMeasurement description: Residual count falling with each histogram bin. The top height of each histogram bin may be found in the bin_top_h dataset. coordinates: delta_time lat_mean lon_mean |
| /gt3r/residual_histogram/lat_mean: | Array of 64 bit Reals [ = 0..21] HDF5_OBJ_FULLPATH: /gt3r/residual_histogram/lat_mean long_name: Latitude Mean standard_name: latitude units: degrees_north source: ATL06 ATBD - Residual_histogram calculation valid_min: -90. valid_max: 90. contentType: physicalMeasurement description: Mean latitude of the segments included in the histogram coordinates: delta_time lon_mean |
| /gt3r/residual_histogram/x_atc_mean: | Array of 64 bit Reals [ = 0..21] HDF5_OBJ_FULLPATH: /gt3r/residual_histogram/x_atc_mean long_name: Along Track Coordinate Mean units: 1 source: ATL06 ATBD - Residual_histogram calculation contentType: physicalMeasurement description: Mean along-track coordinate of the segments included in the histogram. coordinates: delta_time lat_mean lon_mean |
| /gt3r/residual_histogram/segment_id_list: | Array of 32 bit Integers [ = 0..21][ = 0..9] HDF5_OBJ_FULLPATH: /gt3r/residual_histogram/segment_id_list long_name: Segment ID List units: 1 source: ATL06 ATBD - Residual_histogram calculation contentType: referenceInformation description: Segments ids included in each column of the histogram coordinates: delta_time lat_mean lon_mean _FillValue: 2147483647 |
| /gt3r/residual_histogram/bckgrd_per_m: | Array of 32 bit Reals [ = 0..21] HDF5_OBJ_FULLPATH: /gt3r/residual_histogram/bckgrd_per_m long_name: Expected background PEs units: 1 source: ATL06 ATBD - Residual_histogram calculation contentType: physicalMeasurement description: Number of background PE expected for each vertical meter of the histogram based on the observed background rate (bckgrd). coordinates: delta_time lat_mean lon_mean |
| /gt3r/residual_histogram/ds_segment_id: | Array of 16 bit Integers [ = 0..9] HDF5_OBJ_FULLPATH: /gt3r/residual_histogram/ds_segment_id CLASS: DIMENSION_SCALE NAME: ds_segment_id long_name: Segment ID Index units: 1 source: ATL06 ATBD - Residual_histogram calculation valid_min: 1 valid_max: 10 contentType: auxiliaryInformation description: Relative index of each segment_id used in the derivation of the histogram. |
| /gt3r/residual_histogram/pulse_count: | Array of 32 bit Reals [ = 0..21] HDF5_OBJ_FULLPATH: /gt3r/residual_histogram/pulse_count long_name: Number of Histogram Segment Pulses units: counts source: ATL06 ATBD - Residual_histogram calculation contentType: physicalMeasurement description: Number of pulses potentially included in the histogram (pulses are counted if they are in the central 20 m of each segment, even if no PE from the pulse are selected). coordinates: delta_time lat_mean lon_mean |
| /gt3r/residual_histogram/lon_mean: | Array of 64 bit Reals [ = 0..21] HDF5_OBJ_FULLPATH: /gt3r/residual_histogram/lon_mean long_name: Longitude Mean standard_name: longitude units: degrees_east source: ATL06 ATBD - Residual_histogram calculation valid_min: -180. valid_max: 180. contentType: physicalMeasurement description: Mean longitude of the segments included in the histogram coordinates: delta_time lat_mean |
| /gt3r/residual_histogram/delta_time: | Array of 64 bit Reals [ = 0..21] HDF5_OBJ_FULLPATH: /gt3r/residual_histogram/delta_time CLASS: DIMENSION_SCALE NAME: delta_time long_name: Elapsed GPS seconds standard_name: time units: seconds since 2018-01-01 source: ATL06 ATBD - Residual_histogram calculation contentType: referenceInformation 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. coordinates: lat_mean lon_mean |
| /gt3r/residual_histogram/bin_top_h: | Array of 32 bit Reals [ = 0..747] HDF5_OBJ_FULLPATH: /gt3r/residual_histogram/bin_top_h CLASS: DIMENSION_SCALE NAME: bin_top_h long_name: Bin Top Height units: meters source: ATL06 ATBD - Residual_histogram calculation contentType: physicalMeasurement description: Height of the top of each histogram bin, listed in increasing order. The bottom of each bin is equal to the top of the next- lowest bin. coordinates: delta_time lat_mean lon_mean |
| /gt3r/segment_quality/reference_pt_lat: | Array of 64 bit Reals [ = 0..201] HDF5_OBJ_FULLPATH: /gt3r/segment_quality/reference_pt_lat long_name: Latitude units: degrees_north source: ATL06 ATBD - segment_quality group valid_min: -90. valid_max: 90. contentType: referenceInformation description: Latitude of the reference segment location on the RPT coordinates: delta_time reference_pt_lon standard_name: latitude |
| /gt3r/segment_quality/reference_pt_lon: | Array of 64 bit Reals [ = 0..201] HDF5_OBJ_FULLPATH: /gt3r/segment_quality/reference_pt_lon long_name: Longitude units: degrees_east source: ATL06 ATBD - segment_quality group valid_min: -180. valid_max: 180. contentType: referenceInformation description: Longitude of the reference segment location on the RPT coordinates: delta_time reference_pt_lat standard_name: longitude |
| /gt3r/segment_quality/segment_id: | Array of 32 bit Integers [ = 0..201] HDF5_OBJ_FULLPATH: /gt3r/segment_quality/segment_id long_name: Reference Point, m units: 1 source: ATL06 ATBD - segment_quality group contentType: referenceInformation description: Segment number corresponding to the second of two ATL03 segments in the ATL06 segment, counted from the RGT equator crossing coordinates: delta_time reference_pt_lat reference_pt_lon |
| /gt3r/segment_quality/record_number: | Array of 32 bit Integers [ = 0..201] HDF5_OBJ_FULLPATH: /gt3r/segment_quality/record_number long_name: Land Ice Height Index units: 1 source: ATL06 ATBD - segment_quality group contentType: referenceInformation description: For those segments that have adequate signal strength, this parameter gives the record for the pair within the other groups in the granule. coordinates: delta_time reference_pt_lat reference_pt_lon |
| /gt3r/segment_quality/signal_selection_source: | Array of 16 bit Integers [ = 0..201] HDF5_OBJ_FULLPATH: /gt3r/segment_quality/signal_selection_source long_name: Signal Selection Source units: 1 source: ATL06 ATBD - Signal selection base on ATL03 flags valid_min: 0 valid_max: 3 contentType: qualityInformation description: Indicates the last algorithm attempted to select the signal for ATL06 fitting. 0=Signal selection succeeded using ATL03 detected PE; 1=Signal selection failed using ATL03 detected PE but succeeded using all flagged ATL03 PE; 3=All signal-finding strategies failed. coordinates: delta_time reference_pt_lat reference_pt_lon flag_meanings: succeeded_using_pe succeeded_using_flagged_pe failed flag_values: 0, 1, 3 |
| /gt3r/segment_quality/delta_time: | Array of 64 bit Reals [ = 0..201] HDF5_OBJ_FULLPATH: /gt3r/segment_quality/delta_time CLASS: DIMENSION_SCALE long_name: Elapsed GPS seconds standard_name: time units: seconds since 2018-01-01 source: ATL06 ATBD - segment_quality group contentType: referenceInformation 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. coordinates: reference_pt_lat reference_pt_lon NAME: delta_time |
| /gt3r/segment_quality/signal_selection_status/signal_selection_status_all: | Array of 16 bit Integers [ = 0..201] HDF5_OBJ_FULLPATH: /gt3r/segment_quality/signal_selection_status/signal_selection_status_all units: 1 long_name: Signal Selection Status Flag source: ATL06 ATBD - Signal selection base on ATL03 flags valid_min: 0 valid_max: 3 contentType: qualityInformation description: Indicates confidence of the signal-selection algorithm using all ATL03-flagged PEs. 0=Signal selection succeeded using all ATL03-flagged PEs (or algorithm not attempted); 1=Signal selection using all ATL03-flagged PEs failed the 20-meter-spread test; 2=Signal selection using all ATL03-flagged PEs failed the 10-photon-count test; 3=Signal selection using all ATL03-flagged PEs failed both tests coordinates: ../delta_time ../reference_pt_lat ../reference_pt_lon flag_meanings: succeeded failed_20 failed_10 failed_both flag_values: 0, 1, 2, 3 |
| /gt3r/segment_quality/signal_selection_status/signal_selection_status_confident: | Array of 16 bit Integers [ = 0..201] HDF5_OBJ_FULLPATH: /gt3r/segment_quality/signal_selection_status/signal_selection_status_confident units: 1 long_name: Signal Selection Confident Flag source: ATL06 ATBD - Signal selection base on ATL03 flags valid_min: 0 valid_max: 3 contentType: qualityInformation description: Indicates confidence of the signal-selection algorithm using low or better PEs. 0=Signal selection succeeded using ATL03 low-or-better confidence PEs; 1=Signal selection using ATL03 low-or-better confidence PEs failed the 20-meter-spread test; 2=Signal selection using ATL03 low-or-better confidence PEs failed the 10-photon-count test; 3=Signal selection using ATL03 low-or-better confidence PEs failed both tests coordinates: ../delta_time ../reference_pt_lat ../reference_pt_lon flag_meanings: succeeded failed_20 failed_10 failed_both flag_values: 0, 1, 2, 3 |