DAP4 Data Request Form ATL03_20181228015957_13810110_003_01.h5

dataset: ATL03_20181228015957_13810110_003_01.h5
dmr

Actions
Data URL
Global Attributes
no attributes
Global Dimensions
None
Variables
gt1r(Type is Group)
  • attributes
    • Description: Each group contains the segments for one Ground Track. As ICESat-2 orbits the earth, sequential transmit pulses illuminate six ground tracks on the surface of the earth. The track width is approximately 14m. Each ground track is numbered, according to the laser spot number that generates a given ground track. Ground tracks are numbered from the left to the right in the direction of spacecraft travel as: 1L, 1R in the left-most pair of beams; 2L, 2R for the center pair of beams; and 3L, 3R for the right-most pair of beams. (Type is String)
    • atlas_pce: pce3 (Type is String)
    • atlas_beam_type: strong (Type is String)
    • groundtrack_id: gt1r (Type is String)
    • atmosphere_profile: profile_1 (Type is String)
    • atlas_spot_number: 5 (Type is String)
    • sc_orientation: Forward (Type is String)
  • bckgrd_atlas(Type is Group)
    no attributes
    Dimensions: [ /gt1r/bckgrd_atlas/delta_time = 0..89489 ]
    • bckgrd_int_height[ /gt1r/bckgrd_atlas/delta_time= 0..89489] (Type is Float32)
      • attributes
        • contentType: modelResult (Type is String)
        • coordinates: delta_time (Type is String)
        • description: The height of the altimetric range window. This is the height over which the 50-shot sum is generated. Parameter is ingested at 50-Hz, and values are repeated to form a 200-Hz array. (Type is String)
        • long_name: Altimetric range window width (Type is String)
        • source: ATL03 ATBD Section 7.3 (Type is String)
        • units: meters (Type is String)
    • delta_time[ /gt1r/bckgrd_atlas/delta_time= 0..89489] (Type is Float64)
      • attributes
        • description: Elapsed GPS Seconds from the ATLAS SDP GPS Epoch, referenced to the start of the 50-shot sum. This is based on every fiftieth laser fire time, which leads to a very close alignment with major frame boundaries (+/- 1 shot). 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. (Type is String)
        • long_name: Time at the start of ATLAS 50-shot sum (Type is String)
        • source: ATL02 (Type is String)
        • standard_name: time (Type is String)
        • units: seconds since 2018-01-01 (Type is String)
  • heights(Type is Group)
    no attributes
    Dimensions: [ /gt1r/heights/delta_time = 0..4102520 ]
    • lat_ph[ /gt1r/heights/delta_time= 0..4102520] (Type is Float64)
      • attributes
        • coordinates: delta_time lon_ph (Type is String)
        • description: Latitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. (Type is String)
        • long_name: Latitude (Type is String)
        • source: ATL03g ATBD, Section 3.4 (Type is String)
        • standard_name: latitude (Type is String)
        • units: degrees_north (Type is String)
        • valid_max: 90. (Type is Float64)
        • valid_min: -90. (Type is Float64)
    • delta_time[ /gt1r/heights/delta_time= 0..4102520] (Type is Float64)
      • attributes
        • contentType: referenceInformation (Type is String)
        • coordinates: lat_ph lon_ph (Type is String)
        • description: The transmit time of a given photon, measured in seconds from the ATLAS Standard Data Product Epoch. Note that multiple received photons associated with a single transmit pulse will have the same delta_time. 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. (Type is String)
        • long_name: Elapsed GPS seconds (Type is String)
        • source: Operations (Type is String)
        • standard_name: time (Type is String)
        • units: seconds since 2018-01-01 (Type is String)
gt1l(Type is Group)
  • attributes
    • Description: Each group contains the segments for one Ground Track. As ICESat-2 orbits the earth, sequential transmit pulses illuminate six ground tracks on the surface of the earth. The track width is approximately 14m. Each ground track is numbered, according to the laser spot number that generates a given ground track. Ground tracks are numbered from the left to the right in the direction of spacecraft travel as: 1L, 1R in the left-most pair of beams; 2L, 2R for the center pair of beams; and 3L, 3R for the right-most pair of beams. (Type is String)
    • atlas_pce: pce3 (Type is String)
    • atlas_beam_type: weak (Type is String)
    • groundtrack_id: gt1l (Type is String)
    • atmosphere_profile: profile_1 (Type is String)
    • atlas_spot_number: 6 (Type is String)
    • sc_orientation: Forward (Type is String)
  • heights(Type is Group)
    no attributes
    Dimensions: [ /gt1l/heights/delta_time = 0..2923410 ]
    • dist_ph_along[ /gt1l/heights/delta_time= 0..2923410] (Type is Float32)
      • attributes
        • coordinates: delta_time lat_ph lon_ph (Type is String)
        • description: Along-track distance in a segment projected to the ellipsoid of the received photon, based on the Along-Track Segment algorithm. Total along track distance can be found by adding this value to the sum of segment lengths measured from the start of the most recent reference groundtrack. (Type is String)
        • long_name: Distance from equator crossing. (Type is String)
        • source: ATL03 ATBD, Section 3.1 (Type is String)
        • units: meters (Type is String)
    • delta_time[ /gt1l/heights/delta_time= 0..2923410] (Type is Float64)
      • attributes
        • contentType: referenceInformation (Type is String)
        • coordinates: lat_ph lon_ph (Type is String)
        • description: The transmit time of a given photon, measured in seconds from the ATLAS Standard Data Product Epoch. Note that multiple received photons associated with a single transmit pulse will have the same delta_time. 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. (Type is String)
        • long_name: Elapsed GPS seconds (Type is String)
        • source: Operations (Type is String)
        • standard_name: time (Type is String)
        • units: seconds since 2018-01-01 (Type is String)
gt3l(Type is Group)
no attributes
  • geolocation(Type is Group)
    no attributes
    Dimensions: [ /gt3l/geolocation/delta_time = 0..163492 ]
    • segment_ph_cnt[ /gt3l/geolocation/delta_time= 0..163492] (Type is Int32)
      • attributes
        • _FillValue: 0 (Type is Int32)
        • coordinates: delta_time reference_photon_lat reference_photon_lon (Type is String)
        • description: Number of photons in a given along-track segment. In the case of no photons within the segment (segment_ph_cnt=0), most other parameters are filled with invalid or best-estimate values. Maintaining geolocation segments with no photons allows for the geolocation segment arrays to be directly aligned across the gtx groups. (Type is String)
        • long_name: Number of photons (Type is String)
        • source: Derived (Type is String)
        • units: counts (Type is String)
    • segment_length[ /gt3l/geolocation/delta_time= 0..163492] (Type is Float64)
      • attributes
        • coordinates: delta_time reference_photon_lat reference_photon_lon (Type is String)
        • description: The along-track length of the along-track segment. Nominally these are 20m, but they vary from 19.8m to 20.2m. (Type is String)
        • long_name: along-track segment length (Type is String)
        • source: ATL03 ATBD, Section 3.1 (Type is String)
        • units: meters (Type is String)
    • delta_time[ /gt3l/geolocation/delta_time= 0..163492] (Type is Float64)
      • attributes
        • contentType: physicalMeasurement (Type is String)
        • coordinates: reference_photon_lat, reference_photon_lon (Type is String)
        • description: Transmit time of the reference photon, measured in seconds from the atlas_sdp_gps_epoch. If there is no reference photon, this time corresponds to the approximate mid-point time associated with the along-track geolocation segment edge. 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. (Type is String)
        • long_name: Delta Time (Type is String)
        • source: Derived (Type is String)
        • standard_name: time (Type is String)
        • units: seconds since 2018-01-01 (Type is String)
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