| granule_type: | ATL06 |
| short_name: | ATL06 |
| level: | 3A |
| description: | Land ice surface heights for each beam, along and across-track slopes calculated for beam pairs. All parameters are calculated for the same along-track increments for each beam and repeat. |
| contributor_name: | Thomas E Neumann (thomas.neumann@nasa.gov), Thorsten Markus (thorsten.markus@nasa.gov), Suneel Bhardwaj (suneel.bhardwaj@nasa.gov) David W Hancock III (david.w.hancock@nasa.gov) |
| contributor_role: | Instrument Engineer, Investigator, Principle Investigator, Data Producer, Data Producer |
| Conventions: | CF-1.6 |
| 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 |
| identifier_product_doi: | 10.5067/ATLAS/ATL06.001 |
| identifier_product_doi_authority: | http://dx.doi.org |
| identifier_product_type: | ATL06 |
| 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: | 2019-07-01T20:44:17.000000Z |
| hdfversion: | HDF5 1.10.3 |
| history: | 2019-07-01T20:44:17.000000Z;b8766250-e786-3c05-9e4f-2315bf80a2e7;Created by PGE atlas_l3a_is 4.1 |
| identifier_file_uuid: | b8766250-e786-3c05-9e4f-2315bf80a2e7 |
| identifier_product_format_version: | 4.1 |
| time_coverage_duration: | 510.00000000000000 |
| time_coverage_end: | 2019-04-19T05:13:39.000000Z |
| time_coverage_start: | 2019-04-19T05:05:09.000000Z |
| geospatial_lat_min: | 42.801056260088473 |
| geospatial_lon_min: | 20.588676923833397 |
| geospatial_lat_max: | 43.077895640728009 |
| geospatial_lon_max: | 20.662956549374115 |
| 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_file_product_type: | ATL06 |
| 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 |
| Unlimited_Dimension: | gt1l_land_ice_segments_delta_time, gt1l_residual_histogram_delta_time, gt1l_segment_quality_delta_time, gt1r_land_ice_segments_delta_time, gt1r_residual_histogram_delta_time, gt1r_segment_quality_delta_time, orbit_info_crossing_time, orbit_info_sc_orient_time, quality_assessment_gt1l_delta_time, quality_assessment_gt1r_delta_time |
| orbit_info_cycle_number: | Array of 16 bit Integers [orbit_info_crossing_time = 0..0] units: counts contentType: referenceInformation long_name: Cycle Number 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. source: POD/PPD valid_min: 0 valid_max: 50 origname: cycle_number fullnamepath: /orbit_info/cycle_number coordinates: orbit_info_crossing_time |
| orbit_info_orbit_number: | Array of 16 bit Unsigned integers [orbit_info_crossing_time = 0..0] units: 1 contentType: referenceInformation long_name: Orbit Number description: Unique identifying number for each planned ICESat-2 orbit. source: Operations valid_min: 1 valid_max: 65000 origname: orbit_number fullnamepath: /orbit_info/orbit_number coordinates: orbit_info_crossing_time |
| orbit_info_lan: | Array of 64 bit Reals [orbit_info_crossing_time = 0..0] units: degrees_east contentType: referenceInformation long_name: Ascending Node Longitude description: Longitude at the ascending node crossing. source: POD/PPD valid_min: -180.00000000000000 valid_max: 180.00000000000000 origname: lan fullnamepath: /orbit_info/lan coordinates: orbit_info_crossing_time |
| orbit_info_sc_orient: | Array of 16 bit Integers [orbit_info_sc_orient_time = 0..0] units: 1 contentType: referenceInformation long_name: Spacecraft Orientation 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. source: POD/PPD flag_meanings: backward forward transition flag_values: 0, 1, 2 valid_min: 0 valid_max: 2 origname: sc_orient fullnamepath: /orbit_info/sc_orient coordinates: orbit_info_sc_orient_time |
| orbit_info_rgt: | Array of 16 bit Integers [orbit_info_crossing_time = 0..0] units: counts contentType: referenceInformation long_name: Reference Ground track 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. source: POD/PPD valid_min: 1 valid_max: 1387 origname: rgt fullnamepath: /orbit_info/rgt coordinates: orbit_info_crossing_time |
| gt1r_land_ice_segments_sigma_geo_h: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: qualityInformation long_name: Vertical Geolocation Error description: Total vertical geolocation error due to PPD and POD, including the effects of horizontal geolocation error on the segment vertical error. source: section 3.10 origname: sigma_geo_h fullnamepath: /gt1r/land_ice_segments/sigma_geo_h coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_h_li_sigma: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: qualityInformation long_name: Expected RMS segment misfit description: Propagated error due to sampling error and FPB correction from the land ice algorithm source: section 4.4 origname: h_li_sigma fullnamepath: /gt1r/land_ice_segments/h_li_sigma coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_fit_statistics_h_mean: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: modelResult long_name: Height Mean description: Mean surface height, not corrected for first-photon bias or pulse truncation. source: ATL06 ATBD origname: h_mean fullnamepath: /gt1r/land_ice_segments/fit_statistics/h_mean coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_fit_statistics_signal_selection_source: | Array of 16 bit Integers [gt1r_land_ice_segments_delta_time = 0..253] units: 1 contentType: qualityInformation long_name: Signal Selection Source 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. source: section 3.3.3 flag_meanings: succeeded_using_pe succeeded_using_flagged_pe succeeded_using_backup failed flag_values: 0, 1, 2, 3 valid_min: 0 valid_max: 3 origname: signal_selection_source fullnamepath: /gt1r/land_ice_segments/fit_statistics/signal_selection_source coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_fit_statistics_snr: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: 1 contentType: physicalMeasurement long_name: SNR description: Signal-to-noise ratio in the final refined window source: section 3.6.2 origname: snr fullnamepath: /gt1r/land_ice_segments/fit_statistics/snr coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_fit_statistics_h_robust_sprd: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: referenceInformation long_name: Robust Spread description: RDE of misfit between PE heights and the along-track segment fit. source: section 3.6.3 origname: h_robust_sprd fullnamepath: /gt1r/land_ice_segments/fit_statistics/h_robust_sprd coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_fit_statistics_n_seg_pulses: | Array of 32 bit Integers [gt1r_land_ice_segments_delta_time = 0..253] contentType: referenceInformation long_name: Number potential segment pulses description: The number of pulses potentially included in the segment source: section 3.3.3 _FillValue: 2147483647 units: counts origname: n_seg_pulses fullnamepath: /gt1r/land_ice_segments/fit_statistics/n_seg_pulses coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_fit_statistics_dh_fit_dx_sigma: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters/meters contentType: qualityInformation long_name: Sigma of Along Track Slope description: Propagated error in the along-track segment slope source: section 3.6.4 origname: dh_fit_dx_sigma fullnamepath: /gt1r/land_ice_segments/fit_statistics/dh_fit_dx_sigma coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_fit_statistics_snr_significance: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: 1 contentType: physicalMeasurement long_name: SNR Significance 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. source: section 3.6.2 origname: snr_significance fullnamepath: /gt1r/land_ice_segments/fit_statistics/snr_significance coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_fit_statistics_h_expected_rms: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: qualityInformation long_name: Expected RMS misfit description: Expected RMS misfit between PE heights and along-track segment fit source: section 3.6.3 origname: h_expected_rms fullnamepath: /gt1r/land_ice_segments/fit_statistics/h_expected_rms coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_fit_statistics_dh_fit_dy: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters/meters contentType: physicalMeasurement long_name: Across Track Slope description: Across track slope from segment fits to weak and strong beam; the same slope is reported for both laser beams in each pair source: section 3.7 origname: dh_fit_dy fullnamepath: /gt1r/land_ice_segments/fit_statistics/dh_fit_dy coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_fit_statistics_sigma_h_mean: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: qualityInformation long_name: Height Error description: Propagated height error due to PE-height sampling error for height from the along-track fit, not including geolocation-induced error source: section 3.6.4 origname: sigma_h_mean fullnamepath: /gt1r/land_ice_segments/fit_statistics/sigma_h_mean coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_fit_statistics_h_rms_misfit: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: qualityInformation long_name: RMS Misfit description: RMS misfit between PE heights and along- track segment fit source: section 3.6.3 origname: h_rms_misfit fullnamepath: /gt1r/land_ice_segments/fit_statistics/h_rms_misfit coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_fit_statistics_signal_selection_source_status: | Array of 16 bit Integers [gt1r_land_ice_segments_delta_time = 0..253] units: 1 contentType: qualityInformation long_name: Signal Selection Source Status 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 eacoh of the signal_selection_status flags. (See Land Ice ATBD Table 3-2). source: section 3.3.3 valid_min: 0 valid_max: 4 origname: signal_selection_source_status fullnamepath: /gt1r/land_ice_segments/fit_statistics/signal_selection_source_status coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_fit_statistics_dh_fit_dx: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters/meters contentType: physicalMeasurement long_name: Along Track Slope description: Along-track slope from along-track segment fit source: section 3.3.5.1 origname: dh_fit_dx fullnamepath: /gt1r/land_ice_segments/fit_statistics/dh_fit_dx coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_fit_statistics_n_fit_photons: | Array of 32 bit Integers [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 2147483647 units: 1 contentType: physicalMeasurement long_name: Number of Photons in Fit description: Number of PEs used in determining h_li, after editing source: section 3.3.5.2 origname: n_fit_photons fullnamepath: /gt1r/land_ice_segments/fit_statistics/n_fit_photons coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_fit_statistics_w_surface_window_final: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: physicalMeasurement long_name: Surface Window Width description: Width of the surface window, top to bottom source: section 3.3.5.2 origname: w_surface_window_final fullnamepath: /gt1r/land_ice_segments/fit_statistics/w_surface_window_final coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_longitude: | Array of 64 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] units: degrees_east contentType: physicalMeasurement long_name: Longitude standard_name: longitude description: Longitude of segment center, , WGS84, East=+ source: section 3.10 valid_min: -180.00000000000000 valid_max: 180.00000000000000 origname: longitude fullnamepath: /gt1r/land_ice_segments/longitude coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude |
| gt1r_land_ice_segments_latitude: | Array of 64 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] units: degrees_north contentType: physicalMeasurement long_name: Latitude standard_name: latitude description: Latitude of segment center, WGS84, North=+, source: section 3.10 valid_min: -90.000000000000000 valid_max: 90.000000000000000 origname: latitude fullnamepath: /gt1r/land_ice_segments/latitude coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_h_li: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: physicalMeasurement long_name: Land Ice height 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 source: section 4.4 origname: h_li fullnamepath: /gt1r/land_ice_segments/h_li coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_ground_track_ref_azimuth: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: radians contentType: referenceInformation long_name: Azimuth 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). source: ATL03g, Section 3.3 origname: ref_azimuth fullnamepath: /gt1r/land_ice_segments/ground_track/ref_azimuth coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_ground_track_seg_azimuth: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: degrees contentType: referenceInformation long_name: Segment Azimuth description: Azimuth of the pair-track, east of local north. source: section 3.1.2.2 origname: seg_azimuth fullnamepath: /gt1r/land_ice_segments/ground_track/seg_azimuth coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_ground_track_sigma_geo_at: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] contentType: qualityInformation long_name: Across Track Geolocation Error description: Along-track component of the geolocation error. source: section 3.10 _FillValue: 3.402823466e+38 units: meters origname: sigma_geo_at fullnamepath: /gt1r/land_ice_segments/ground_track/sigma_geo_at coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_ground_track_sigma_geo_xt: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: qualityInformation long_name: Along Track Geolocation Error description: Across-track component of the geolocation error. source: section 3.10 origname: sigma_geo_xt fullnamepath: /gt1r/land_ice_segments/ground_track/sigma_geo_xt coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_ground_track_ref_coelv: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: radians contentType: referenceInformation long_name: Co-elevation description: Coelevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot. source: ATL03g, Section 3.3 origname: ref_coelv fullnamepath: /gt1r/land_ice_segments/ground_track/ref_coelv coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_ground_track_x_atc: | Array of 64 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 1.7976931348623157e+308 units: meters contentType: referenceInformation long_name: X Along Track 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. source: section 3.1.2.2 origname: x_atc fullnamepath: /gt1r/land_ice_segments/ground_track/x_atc coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_ground_track_y_atc: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: referenceInformation long_name: Y Along Track 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. source: section 3.1.2.2 origname: y_atc fullnamepath: /gt1r/land_ice_segments/ground_track/y_atc coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_dem_dem_flag: | Array of 16 bit Integers [gt1r_land_ice_segments_delta_time = 0..253] units: 1 contentType: referenceInformation long_name: DEM Source Flag description: Indicates source of the DEM height. Values: 0=None, 1=GIMP, 2=GMTED, 3=MSS, 4=Antarctic. source: DTU10/GMTED/GIMP flag_meanings: none gimp gmted mss antarctic flag_values: 0, 1, 2, 3, 4 valid_min: 0 valid_max: 4 origname: dem_flag fullnamepath: /gt1r/land_ice_segments/dem/dem_flag coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_dem_dem_h: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] units: meters contentType: referenceInformation long_name: DEM Height description: Height of the DEM, interpolated by cubic-spline interpolation in the DEM coordinate system to the PE location. source: DTU10/GMTED/GIMP origname: dem_h fullnamepath: /gt1r/land_ice_segments/dem/dem_h coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_dem_geoid_h: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: referenceInformation long_name: Geoid Height description: Geoid height above WGS-84 reference ellipsoid (range -107 to 86m), source: EGM2008 origname: geoid_h fullnamepath: /gt1r/land_ice_segments/dem/geoid_h coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_geophysical_msw_flag: | Array of 16 bit Integers [gt1r_land_ice_segments_delta_time = 0..253] contentType: referenceInformation long_name: Multiple Scattering Warning Flag description: Combined flag indicating the risks of severe multiple scattering. 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. source: ATL09 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 valid_min: -1 valid_max: 5 _FillValue: 127 units: 1 origname: msw_flag fullnamepath: /gt1r/land_ice_segments/geophysical/msw_flag coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_geophysical_bsnow_conf: | Array of 16 bit Integers [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 127 units: 1 contentType: referenceInformation long_name: Blowing Snow confidence description: Confidence flag for presence of blowing snow source: ATL09 origname: bsnow_conf fullnamepath: /gt1r/land_ice_segments/geophysical/bsnow_conf coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_geophysical_bsnow_h: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: referenceInformation long_name: Blowing Snow Layer Top Height description: Blowing snow layer top height source: ATL09 origname: bsnow_h fullnamepath: /gt1r/land_ice_segments/geophysical/bsnow_h coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_geophysical_tide_ocean: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: referenceInformation long_name: Ocean Tide description: Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium). source: ATL03 ATBD, Section 6.3.1 origname: tide_ocean fullnamepath: /gt1r/land_ice_segments/geophysical/tide_ocean coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_geophysical_tide_earth: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: referenceInformation long_name: Earth Tide description: Solid Earth Tides source: ATL03 ATBD, Section 6.3.3 origname: tide_earth fullnamepath: /gt1r/land_ice_segments/geophysical/tide_earth coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_geophysical_solar_azimuth: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: degrees_east contentType: referenceInformation long_name: solar azimuth description: The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot. source: ATL03 origname: solar_azimuth fullnamepath: /gt1r/land_ice_segments/geophysical/solar_azimuth coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_geophysical_r_eff: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: 1 contentType: referenceInformation long_name: Effective uncorrected reflectance description: Effective reflectance, uncorrected for atmospheric effects. source: section 3.1.5.4 origname: r_eff fullnamepath: /gt1r/land_ice_segments/geophysical/r_eff coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_geophysical_dac: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: referenceInformation long_name: Dynamic Atmosphere Correction description: Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect. source: ATL03, 6.3.2 origname: dac fullnamepath: /gt1r/land_ice_segments/geophysical/dac coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_geophysical_tide_load: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: referenceInformation long_name: Load Tide description: Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm). source: ATL03 ATBD, Section 6.3.4 origname: tide_load fullnamepath: /gt1r/land_ice_segments/geophysical/tide_load coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_geophysical_bsnow_od: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: 1 contentType: modelResult long_name: Blowing snow OD description: Optical thickness of blowing snow layer. source: ATL09 origname: bsnow_od fullnamepath: /gt1r/land_ice_segments/geophysical/bsnow_od coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_geophysical_cloud_flg_atm: | Array of 16 bit Integers [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 127 units: 1 contentType: referenceInformation long_name: Cloud flag description: Indicates the probability of clouds based on backscatter measurements source: ATL09 flag_meanings: no yes flag_values: 0, 1 valid_min: 0 valid_max: 1 origname: cloud_flg_atm fullnamepath: /gt1r/land_ice_segments/geophysical/cloud_flg_atm coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_geophysical_solar_elevation: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: degrees contentType: referenceInformation long_name: solar elevation 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. source: ATL03 valid_min: -90.00000000 valid_max: 90.00000000 origname: solar_elevation fullnamepath: /gt1r/land_ice_segments/geophysical/solar_elevation coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_geophysical_tide_pole: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: referenceInformation long_name: Solid Earth Pole Tide description: Solid Earth Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm). source: ATL03 ATBD, Section 6.3.5 origname: tide_pole fullnamepath: /gt1r/land_ice_segments/geophysical/tide_pole coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_geophysical_e_bckgrd: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: hz contentType: referenceInformation long_name: Expected background count rate description: Expected background count rate based on sun angle, surface slope, for unit surface reflectance source: section 3.6.1 origname: e_bckgrd fullnamepath: /gt1r/land_ice_segments/geophysical/e_bckgrd coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_geophysical_cloud_flg_asr: | Array of 16 bit Integers [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 127 units: 1 contentType: referenceInformation long_name: cloud flag confidence description: Indicates cloud attenuation as calculated from the apparent surface reflectance, assuming a white snow surface source: ATL09 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 valid_min: 0 valid_max: 5 origname: cloud_flg_asr fullnamepath: /gt1r/land_ice_segments/geophysical/cloud_flg_asr coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_geophysical_bckgrd: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: hz contentType: referenceInformation long_name: Background count rate description: Background count rate, derived from the ATL03 50-shot-average, interpolated to the segment center. source: section 3.6.1 origname: bckgrd fullnamepath: /gt1r/land_ice_segments/geophysical/bckgrd coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_geophysical_neutat_delay_total: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: referenceInformation long_name: Total Neutral Atmospheric Delay description: Total neutral atmosphere delay correction (wet+dry). source: ATL03a ATBD origname: neutat_delay_total fullnamepath: /gt1r/land_ice_segments/geophysical/neutat_delay_total coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_atl06_quality_summary: | Array of 16 bit Integers [gt1r_land_ice_segments_delta_time = 0..253] units: 1 contentType: qualityInformation long_name: ATL06_Quality_Summary 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. source: section 4.3 flag_meanings: best_quality potential_problem flag_values: 0, 1 valid_min: 0 valid_max: 1 origname: atl06_quality_summary fullnamepath: /gt1r/land_ice_segments/atl06_quality_summary coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_segment_id: | Array of 32 bit Integers [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 0 units: 1 contentType: referenceInformation long_name: Reference Point, m 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 source: section 3.1.2.1 origname: segment_id fullnamepath: /gt1r/land_ice_segments/segment_id coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_bias_correction_fpb_mean_corr: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] contentType: qualityInformation long_name: first photon bias mean correction description: Estimated first-photon bias (fpb) correction to mean segment height source: section 3.4.3.1 _FillValue: 3.402823466e+38 units: meters origname: fpb_mean_corr fullnamepath: /gt1r/land_ice_segments/bias_correction/fpb_mean_corr coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_bias_correction_fpb_mean_corr_sigma: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] contentType: qualityInformation long_name: fpb mean corr sigma description: Estimated error in fpb_mean_corr source: section 3.4.3.1 _FillValue: 3.402823466e+38 units: meters origname: fpb_mean_corr_sigma fullnamepath: /gt1r/land_ice_segments/bias_correction/fpb_mean_corr_sigma coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_bias_correction_fpb_med_corr: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: qualityInformation long_name: fpb median corr description: First-photon-bias correction giving the difference between the mean segment height and the corrected median height source: section 3.4.3.2 origname: fpb_med_corr fullnamepath: /gt1r/land_ice_segments/bias_correction/fpb_med_corr coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_bias_correction_fpb_med_corr_sigma: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: qualityInformation long_name: fpb median corr sigma description: Estimated error in fpb_med_corr source: section 3.4.3.2 origname: fpb_med_corr_sigma fullnamepath: /gt1r/land_ice_segments/bias_correction/fpb_med_corr_sigma coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_bias_correction_fpb_n_corr: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: counts contentType: qualityInformation long_name: fpb number photons corr description: Estimated window photon count after first-photon-bias correction source: section 4.3.3.3 origname: fpb_n_corr fullnamepath: /gt1r/land_ice_segments/bias_correction/fpb_n_corr coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_bias_correction_tx_mean_corr: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: qualityInformation long_name: tx shape mean correction 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 source: section 3.5 origname: tx_mean_corr fullnamepath: /gt1r/land_ice_segments/bias_correction/tx_mean_corr coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_bias_correction_med_r_fit: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: qualityInformation long_name: mean median residual description: Difference between uncorrected mean and median of linear fit residuals source: section 3.3.5 origname: med_r_fit fullnamepath: /gt1r/land_ice_segments/bias_correction/med_r_fit coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_land_ice_segments_bias_correction_tx_med_corr: | Array of 32 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: qualityInformation long_name: tx shape median correction 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 source: section 3.5 origname: tx_med_corr fullnamepath: /gt1r/land_ice_segments/bias_correction/tx_med_corr coordinates: gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude |
| gt1r_residual_histogram_count: | Array of 32 bit Integers [gt1r_residual_histogram_delta_time = 0..20][gt1r_residual_histogram_dh = 0..999] units: counts contentType: physicalMeasurement long_name: Bin Counts description: Residual count in 1-cm bins, for PE within 10 (horizontal) m of segment centers for each histogram. source: Section 4.11 origname: count fullnamepath: /gt1r/residual_histogram/count coordinates: gt1r_residual_histogram_delta_time gt1r_residual_histogram_lat_mean gt1r_residual_histogram_lon_mean |
| gt1r_residual_histogram_lat_mean: | Array of 64 bit Reals [gt1r_residual_histogram_delta_time = 0..20] units: degrees_north contentType: physicalMeasurement long_name: Latitude Mean standard_name: latitude description: Mean latitude of the segments included in the histogram source: Section 4.11 valid_min: -90.000000000000000 valid_max: 90.000000000000000 origname: lat_mean fullnamepath: /gt1r/residual_histogram/lat_mean coordinates: gt1r_residual_histogram_delta_time gt1r_residual_histogram_lon_mean |
| gt1r_residual_histogram_bckgrd_per_bin: | Array of 32 bit Reals [gt1r_residual_histogram_delta_time = 0..20] units: 1 contentType: physicalMeasurement long_name: Expected background PEs description: Number of background PE expected for the bins in each column of the histogram based on the observed background rate (bckgrd). source: Section 4.11 origname: bckgrd_per_bin fullnamepath: /gt1r/residual_histogram/bckgrd_per_bin coordinates: gt1r_residual_histogram_delta_time gt1r_residual_histogram_lat_mean gt1r_residual_histogram_lon_mean |
| gt1r_residual_histogram_x_atc_mean: | Array of 64 bit Reals [gt1r_residual_histogram_delta_time = 0..20] units: 1 contentType: physicalMeasurement long_name: Along Track Coordinate Mean description: Mean along-track coordinate of the segments included in the histogram. source: Section 4.11 origname: x_atc_mean fullnamepath: /gt1r/residual_histogram/x_atc_mean coordinates: gt1r_residual_histogram_delta_time gt1r_residual_histogram_lat_mean gt1r_residual_histogram_lon_mean |
| gt1r_residual_histogram_segment_id_list: | Array of 32 bit Integers [gt1r_residual_histogram_delta_time = 0..20][gt1r_residual_histogram_ds_segment_id = 0..9] units: 1 contentType: referenceInformation long_name: Segment ID List description: Segments ids included in each column of the histogram source: Section 4.11 _FillValue: 2147483647 origname: segment_id_list fullnamepath: /gt1r/residual_histogram/segment_id_list coordinates: gt1r_residual_histogram_delta_time gt1r_residual_histogram_lat_mean gt1r_residual_histogram_lon_mean |
| gt1r_residual_histogram_pulse_count: | Array of 32 bit Integers [gt1r_residual_histogram_delta_time = 0..20] units: counts contentType: physicalMeasurement long_name: Number of Histogram Segment Pulses 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). source: Section 4.11 origname: pulse_count fullnamepath: /gt1r/residual_histogram/pulse_count coordinates: gt1r_residual_histogram_delta_time gt1r_residual_histogram_lat_mean gt1r_residual_histogram_lon_mean |
| gt1r_residual_histogram_lon_mean: | Array of 64 bit Reals [gt1r_residual_histogram_delta_time = 0..20] units: degrees_east contentType: physicalMeasurement long_name: Longitude Mean standard_name: longitude description: Mean longitude of the segments included in the histogram source: Section 4.11 valid_min: -180.00000000000000 valid_max: 180.00000000000000 origname: lon_mean fullnamepath: /gt1r/residual_histogram/lon_mean coordinates: gt1r_residual_histogram_delta_time gt1r_residual_histogram_lat_mean |
| gt1r_segment_quality_record_number: | Array of 32 bit Integers [gt1r_segment_quality_delta_time = 0..1519] units: 1 long_name: Land Ice Height Index description: For those segments that have adequate signal strength, this parameter gives the record for the pair within the other groups in the granule. source: section 4.2 contentType: referenceInformation origname: record_number fullnamepath: /gt1r/segment_quality/record_number coordinates: gt1r_segment_quality_delta_time gt1r_segment_quality_reference_pt_lat gt1r_segment_quality_reference_pt_lon |
| gt1r_segment_quality_reference_pt_lat: | Array of 64 bit Reals [gt1r_segment_quality_delta_time = 0..1519] units: degrees_north long_name: Latitude standard_name: latitude description: Latitude of the reference segment location on the RPT source: section 3.1.9 valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation origname: reference_pt_lat fullnamepath: /gt1r/segment_quality/reference_pt_lat coordinates: gt1r_segment_quality_delta_time gt1r_segment_quality_reference_pt_lon |
| gt1r_segment_quality_reference_pt_lon: | Array of 64 bit Reals [gt1r_segment_quality_delta_time = 0..1519] units: degrees_east contentType: referenceInformation long_name: Longitude standard_name: longitude description: Longitude of the reference segment location on the RPT source: section 3.1.9 valid_min: -180.00000000000000 valid_max: 180.00000000000000 origname: reference_pt_lon fullnamepath: /gt1r/segment_quality/reference_pt_lon coordinates: gt1r_segment_quality_delta_time gt1r_segment_quality_reference_pt_lat |
| gt1r_segment_quality_segment_id: | Array of 32 bit Integers [gt1r_segment_quality_delta_time = 0..1519] units: 1 contentType: referenceInformation long_name: Reference Point, m description: Segment number corresponding to the second of two ATL03 segments in the ATL06 segment, counted from the RGT equator crossing source: section 3.1.2.1 origname: segment_id fullnamepath: /gt1r/segment_quality/segment_id coordinates: gt1r_segment_quality_delta_time gt1r_segment_quality_reference_pt_lat gt1r_segment_quality_reference_pt_lon |
| gt1r_segment_quality_signal_selection_source: | Array of 16 bit Integers [gt1r_segment_quality_delta_time = 0..1519] units: 1 contentType: qualityInformation long_name: Signal Selection Source 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. source: section 3.3.3 flag_meanings: succeeded_using_pe succeeded_using_flagged_pe succeeded_using_backup failed flag_values: 0, 1, 2, 3 valid_min: 0 valid_max: 3 origname: signal_selection_source fullnamepath: /gt1r/segment_quality/signal_selection_source coordinates: gt1r_segment_quality_delta_time gt1r_segment_quality_reference_pt_lat gt1r_segment_quality_reference_pt_lon |
| gt1r_segment_quality_signal_selection_status_signal_selection_status_all: | Array of 16 bit Integers [gt1r_segment_quality_delta_time = 0..1519] units: 1 contentType: qualityInformation long_name: Signal Selection Status Flag description: Indicates confidence of the signal-selection algorithm using all ATL03-flagged PEs. 0=Signal selection succeeded using all ATL03-flagged PEs (or algorthm 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 source: section 3.3.3 flag_meanings: succeeded failed_20 failed_10 failed_both flag_values: 0, 1, 2, 3 valid_min: 0 valid_max: 3 origname: signal_selection_status_all fullnamepath: /gt1r/segment_quality/signal_selection_status/signal_selection_status_all coordinates: gt1r_segment_quality_delta_time gt1r_segment_quality_reference_pt_lat gt1r_segment_quality_reference_pt_lon |
| gt1r_segment_quality_signal_selection_status_signal_selection_status_backup: | Array of 16 bit Integers [gt1r_segment_quality_delta_time = 0..1519] units: 1 contentType: qualityInformation long_name: Signal Selection Backup Flag description: Indicates confidence of the signal-selection algorithm using the backup signal finder. 0=Signal selection succeeded using the backup signal finder after centering the window on flagged PE (or backup signal finder not attempted); 1=Signal selection succeeded using the backup signal finder after searching for the strongest-signal window using four adjacent ATL03 segments; 2=Signal selection using the backup signal finder failed the 20-meter spread test; 3=Signal selection using the backup signal finder failed the 10-photon count test; 4=Signal selection using the backup signal finder failed both tests source: section 3.3.3 flag_meanings: succeeded failed_widen failed_20 failed_10 failed_both flag_values: 0, 1, 2, 3, 4 valid_min: 0 valid_max: 4 origname: signal_selection_status_backup fullnamepath: /gt1r/segment_quality/signal_selection_status/signal_selection_status_backup coordinates: gt1r_segment_quality_delta_time gt1r_segment_quality_reference_pt_lat gt1r_segment_quality_reference_pt_lon |
| gt1r_segment_quality_signal_selection_status_signal_selection_status_confident: | Array of 16 bit Integers [gt1r_segment_quality_delta_time = 0..1519] units: 1 contentType: qualityInformation long_name: Signal Selection Confident Flag 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 source: section 3.3.3 flag_meanings: succeeded failed_20 failed_10 failed_both flag_values: 0, 1, 2, 3 valid_min: 0 valid_max: 3 origname: signal_selection_status_confident fullnamepath: /gt1r/segment_quality/signal_selection_status/signal_selection_status_confident coordinates: gt1r_segment_quality_delta_time gt1r_segment_quality_reference_pt_lat gt1r_segment_quality_reference_pt_lon |
| gt1l_land_ice_segments_sigma_geo_h: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: qualityInformation long_name: Vertical Geolocation Error description: Total vertical geolocation error due to PPD and POD, including the effects of horizontal geolocation error on the segment vertical error. source: section 3.10 origname: sigma_geo_h fullnamepath: /gt1l/land_ice_segments/sigma_geo_h coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_h_li_sigma: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: qualityInformation long_name: Expected RMS segment misfit description: Propagated error due to sampling error and FPB correction from the land ice algorithm source: section 4.4 origname: h_li_sigma fullnamepath: /gt1l/land_ice_segments/h_li_sigma coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_fit_statistics_h_mean: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: modelResult long_name: Height Mean description: Mean surface height, not corrected for first-photon bias or pulse truncation. source: ATL06 ATBD origname: h_mean fullnamepath: /gt1l/land_ice_segments/fit_statistics/h_mean coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_fit_statistics_signal_selection_source: | Array of 16 bit Integers [gt1l_land_ice_segments_delta_time = 0..253] units: 1 contentType: qualityInformation long_name: Signal Selection Source 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. source: section 3.3.3 flag_meanings: succeeded_using_pe succeeded_using_flagged_pe succeeded_using_backup failed flag_values: 0, 1, 2, 3 valid_min: 0 valid_max: 3 origname: signal_selection_source fullnamepath: /gt1l/land_ice_segments/fit_statistics/signal_selection_source coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_fit_statistics_snr: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: 1 contentType: physicalMeasurement long_name: SNR description: Signal-to-noise ratio in the final refined window source: section 3.6.2 origname: snr fullnamepath: /gt1l/land_ice_segments/fit_statistics/snr coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_fit_statistics_h_robust_sprd: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: referenceInformation long_name: Robust Spread description: RDE of misfit between PE heights and the along-track segment fit. source: section 3.6.3 origname: h_robust_sprd fullnamepath: /gt1l/land_ice_segments/fit_statistics/h_robust_sprd coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_fit_statistics_n_seg_pulses: | Array of 32 bit Integers [gt1l_land_ice_segments_delta_time = 0..253] contentType: referenceInformation long_name: Number potential segment pulses description: The number of pulses potentially included in the segment source: section 3.3.3 _FillValue: 2147483647 units: counts origname: n_seg_pulses fullnamepath: /gt1l/land_ice_segments/fit_statistics/n_seg_pulses coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_fit_statistics_dh_fit_dx_sigma: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters/meters contentType: qualityInformation long_name: Sigma of Along Track Slope description: Propagated error in the along-track segment slope source: section 3.6.4 origname: dh_fit_dx_sigma fullnamepath: /gt1l/land_ice_segments/fit_statistics/dh_fit_dx_sigma coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_fit_statistics_snr_significance: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: 1 contentType: physicalMeasurement long_name: SNR Significance 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. source: section 3.6.2 origname: snr_significance fullnamepath: /gt1l/land_ice_segments/fit_statistics/snr_significance coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_fit_statistics_h_expected_rms: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: qualityInformation long_name: Expected RMS misfit description: Expected RMS misfit between PE heights and along-track segment fit source: section 3.6.3 origname: h_expected_rms fullnamepath: /gt1l/land_ice_segments/fit_statistics/h_expected_rms coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_fit_statistics_dh_fit_dy: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters/meters contentType: physicalMeasurement long_name: Across Track Slope description: Across track slope from segment fits to weak and strong beam; the same slope is reported for both laser beams in each pair source: section 3.7 origname: dh_fit_dy fullnamepath: /gt1l/land_ice_segments/fit_statistics/dh_fit_dy coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_fit_statistics_sigma_h_mean: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: qualityInformation long_name: Height Error description: Propagated height error due to PE-height sampling error for height from the along-track fit, not including geolocation-induced error source: section 3.6.4 origname: sigma_h_mean fullnamepath: /gt1l/land_ice_segments/fit_statistics/sigma_h_mean coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_fit_statistics_h_rms_misfit: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: qualityInformation long_name: RMS Misfit description: RMS misfit between PE heights and along- track segment fit source: section 3.6.3 origname: h_rms_misfit fullnamepath: /gt1l/land_ice_segments/fit_statistics/h_rms_misfit coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_fit_statistics_signal_selection_source_status: | Array of 16 bit Integers [gt1l_land_ice_segments_delta_time = 0..253] units: 1 contentType: qualityInformation long_name: Signal Selection Source Status 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 eacoh of the signal_selection_status flags. (See Land Ice ATBD Table 3-2). source: section 3.3.3 valid_min: 0 valid_max: 4 origname: signal_selection_source_status fullnamepath: /gt1l/land_ice_segments/fit_statistics/signal_selection_source_status coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_fit_statistics_dh_fit_dx: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters/meters contentType: physicalMeasurement long_name: Along Track Slope description: Along-track slope from along-track segment fit source: section 3.3.5.1 origname: dh_fit_dx fullnamepath: /gt1l/land_ice_segments/fit_statistics/dh_fit_dx coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_fit_statistics_n_fit_photons: | Array of 32 bit Integers [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 2147483647 units: 1 contentType: physicalMeasurement long_name: Number of Photons in Fit description: Number of PEs used in determining h_li, after editing source: section 3.3.5.2 origname: n_fit_photons fullnamepath: /gt1l/land_ice_segments/fit_statistics/n_fit_photons coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_fit_statistics_w_surface_window_final: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: physicalMeasurement long_name: Surface Window Width description: Width of the surface window, top to bottom source: section 3.3.5.2 origname: w_surface_window_final fullnamepath: /gt1l/land_ice_segments/fit_statistics/w_surface_window_final coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_longitude: | Array of 64 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] units: degrees_east contentType: physicalMeasurement long_name: Longitude standard_name: longitude description: Longitude of segment center, , WGS84, East=+ source: section 3.10 valid_min: -180.00000000000000 valid_max: 180.00000000000000 origname: longitude fullnamepath: /gt1l/land_ice_segments/longitude coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude |
| gt1l_land_ice_segments_latitude: | Array of 64 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] units: degrees_north contentType: physicalMeasurement long_name: Latitude standard_name: latitude description: Latitude of segment center, WGS84, North=+, source: section 3.10 valid_min: -90.000000000000000 valid_max: 90.000000000000000 origname: latitude fullnamepath: /gt1l/land_ice_segments/latitude coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_h_li: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: physicalMeasurement long_name: Land Ice height 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 source: section 4.4 origname: h_li fullnamepath: /gt1l/land_ice_segments/h_li coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_ground_track_ref_azimuth: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: radians contentType: referenceInformation long_name: Azimuth 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). source: ATL03g, Section 3.3 origname: ref_azimuth fullnamepath: /gt1l/land_ice_segments/ground_track/ref_azimuth coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_ground_track_seg_azimuth: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: degrees contentType: referenceInformation long_name: Segment Azimuth description: Azimuth of the pair-track, east of local north. source: section 3.1.2.2 origname: seg_azimuth fullnamepath: /gt1l/land_ice_segments/ground_track/seg_azimuth coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_ground_track_sigma_geo_at: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] contentType: qualityInformation long_name: Across Track Geolocation Error description: Along-track component of the geolocation error. source: section 3.10 _FillValue: 3.402823466e+38 units: meters origname: sigma_geo_at fullnamepath: /gt1l/land_ice_segments/ground_track/sigma_geo_at coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_ground_track_sigma_geo_xt: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: qualityInformation long_name: Along Track Geolocation Error description: Across-track component of the geolocation error. source: section 3.10 origname: sigma_geo_xt fullnamepath: /gt1l/land_ice_segments/ground_track/sigma_geo_xt coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_ground_track_ref_coelv: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: radians contentType: referenceInformation long_name: Co-elevation description: Coelevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot. source: ATL03g, Section 3.3 origname: ref_coelv fullnamepath: /gt1l/land_ice_segments/ground_track/ref_coelv coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_ground_track_x_atc: | Array of 64 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 1.7976931348623157e+308 units: meters contentType: referenceInformation long_name: X Along Track 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. source: section 3.1.2.2 origname: x_atc fullnamepath: /gt1l/land_ice_segments/ground_track/x_atc coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_ground_track_y_atc: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: referenceInformation long_name: Y Along Track 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. source: section 3.1.2.2 origname: y_atc fullnamepath: /gt1l/land_ice_segments/ground_track/y_atc coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_dem_dem_flag: | Array of 16 bit Integers [gt1l_land_ice_segments_delta_time = 0..253] units: 1 contentType: referenceInformation long_name: DEM Source Flag description: Indicates source of the DEM height. Values: 0=None, 1=GIMP, 2=GMTED, 3=MSS, 4=Antarctic. source: DTU10/GMTED/GIMP flag_meanings: none gimp gmted mss antarctic flag_values: 0, 1, 2, 3, 4 valid_min: 0 valid_max: 4 origname: dem_flag fullnamepath: /gt1l/land_ice_segments/dem/dem_flag coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_dem_dem_h: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] units: meters contentType: referenceInformation long_name: DEM Height description: Height of the DEM, interpolated by cubic-spline interpolation in the DEM coordinate system to the PE location. source: DTU10/GMTED/GIMP origname: dem_h fullnamepath: /gt1l/land_ice_segments/dem/dem_h coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_dem_geoid_h: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: referenceInformation long_name: Geoid Height description: Geoid height above WGS-84 reference ellipsoid (range -107 to 86m), source: EGM2008 origname: geoid_h fullnamepath: /gt1l/land_ice_segments/dem/geoid_h coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_geophysical_msw_flag: | Array of 16 bit Integers [gt1l_land_ice_segments_delta_time = 0..253] contentType: referenceInformation long_name: Multiple Scattering Warning Flag description: Combined flag indicating the risks of severe multiple scattering. 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. source: ATL09 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 valid_min: -1 valid_max: 5 _FillValue: 127 units: 1 origname: msw_flag fullnamepath: /gt1l/land_ice_segments/geophysical/msw_flag coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_geophysical_bsnow_conf: | Array of 16 bit Integers [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 127 units: 1 contentType: referenceInformation long_name: Blowing Snow confidence description: Confidence flag for presence of blowing snow source: ATL09 origname: bsnow_conf fullnamepath: /gt1l/land_ice_segments/geophysical/bsnow_conf coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_geophysical_bsnow_h: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: referenceInformation long_name: Blowing Snow Layer Top Height description: Blowing snow layer top height source: ATL09 origname: bsnow_h fullnamepath: /gt1l/land_ice_segments/geophysical/bsnow_h coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_geophysical_tide_ocean: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: referenceInformation long_name: Ocean Tide description: Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium). source: ATL03 ATBD, Section 6.3.1 origname: tide_ocean fullnamepath: /gt1l/land_ice_segments/geophysical/tide_ocean coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_geophysical_tide_earth: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: referenceInformation long_name: Earth Tide description: Solid Earth Tides source: ATL03 ATBD, Section 6.3.3 origname: tide_earth fullnamepath: /gt1l/land_ice_segments/geophysical/tide_earth coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_geophysical_solar_azimuth: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: degrees_east contentType: referenceInformation long_name: solar azimuth description: The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot. source: ATL03 origname: solar_azimuth fullnamepath: /gt1l/land_ice_segments/geophysical/solar_azimuth coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_geophysical_r_eff: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: 1 contentType: referenceInformation long_name: Effective uncorrected reflectance description: Effective reflectance, uncorrected for atmospheric effects. source: section 3.1.5.4 origname: r_eff fullnamepath: /gt1l/land_ice_segments/geophysical/r_eff coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_geophysical_dac: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: referenceInformation long_name: Dynamic Atmosphere Correction description: Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect. source: ATL03, 6.3.2 origname: dac fullnamepath: /gt1l/land_ice_segments/geophysical/dac coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_geophysical_tide_load: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: referenceInformation long_name: Load Tide description: Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm). source: ATL03 ATBD, Section 6.3.4 origname: tide_load fullnamepath: /gt1l/land_ice_segments/geophysical/tide_load coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_geophysical_bsnow_od: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: 1 contentType: modelResult long_name: Blowing snow OD description: Optical thickness of blowing snow layer. source: ATL09 origname: bsnow_od fullnamepath: /gt1l/land_ice_segments/geophysical/bsnow_od coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_geophysical_cloud_flg_atm: | Array of 16 bit Integers [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 127 units: 1 contentType: referenceInformation long_name: Cloud flag description: Indicates the probability of clouds based on backscatter measurements source: ATL09 flag_meanings: no yes flag_values: 0, 1 valid_min: 0 valid_max: 1 origname: cloud_flg_atm fullnamepath: /gt1l/land_ice_segments/geophysical/cloud_flg_atm coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_geophysical_solar_elevation: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: degrees contentType: referenceInformation long_name: solar elevation 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. source: ATL03 valid_min: -90.00000000 valid_max: 90.00000000 origname: solar_elevation fullnamepath: /gt1l/land_ice_segments/geophysical/solar_elevation coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_geophysical_tide_pole: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: referenceInformation long_name: Solid Earth Pole Tide description: Solid Earth Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm). source: ATL03 ATBD, Section 6.3.5 origname: tide_pole fullnamepath: /gt1l/land_ice_segments/geophysical/tide_pole coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_geophysical_e_bckgrd: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: hz contentType: referenceInformation long_name: Expected background count rate description: Expected background count rate based on sun angle, surface slope, for unit surface reflectance source: section 3.6.1 origname: e_bckgrd fullnamepath: /gt1l/land_ice_segments/geophysical/e_bckgrd coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_geophysical_cloud_flg_asr: | Array of 16 bit Integers [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 127 units: 1 contentType: referenceInformation long_name: cloud flag confidence description: Indicates cloud attenuation as calculated from the apparent surface reflectance, assuming a white snow surface source: ATL09 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 valid_min: 0 valid_max: 5 origname: cloud_flg_asr fullnamepath: /gt1l/land_ice_segments/geophysical/cloud_flg_asr coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_geophysical_bckgrd: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: hz contentType: referenceInformation long_name: Background count rate description: Background count rate, derived from the ATL03 50-shot-average, interpolated to the segment center. source: section 3.6.1 origname: bckgrd fullnamepath: /gt1l/land_ice_segments/geophysical/bckgrd coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_geophysical_neutat_delay_total: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: referenceInformation long_name: Total Neutral Atmospheric Delay description: Total neutral atmosphere delay correction (wet+dry). source: ATL03a ATBD origname: neutat_delay_total fullnamepath: /gt1l/land_ice_segments/geophysical/neutat_delay_total coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_atl06_quality_summary: | Array of 16 bit Integers [gt1l_land_ice_segments_delta_time = 0..253] units: 1 contentType: qualityInformation long_name: ATL06_Quality_Summary 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. source: section 4.3 flag_meanings: best_quality potential_problem flag_values: 0, 1 valid_min: 0 valid_max: 1 origname: atl06_quality_summary fullnamepath: /gt1l/land_ice_segments/atl06_quality_summary coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_segment_id: | Array of 32 bit Integers [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 0 units: 1 contentType: referenceInformation long_name: Reference Point, m 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 source: section 3.1.2.1 origname: segment_id fullnamepath: /gt1l/land_ice_segments/segment_id coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_bias_correction_fpb_mean_corr: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] contentType: qualityInformation long_name: first photon bias mean correction description: Estimated first-photon bias (fpb) correction to mean segment height source: section 3.4.3.1 _FillValue: 3.402823466e+38 units: meters origname: fpb_mean_corr fullnamepath: /gt1l/land_ice_segments/bias_correction/fpb_mean_corr coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_bias_correction_fpb_mean_corr_sigma: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] contentType: qualityInformation long_name: fpb mean corr sigma description: Estimated error in fpb_mean_corr source: section 3.4.3.1 _FillValue: 3.402823466e+38 units: meters origname: fpb_mean_corr_sigma fullnamepath: /gt1l/land_ice_segments/bias_correction/fpb_mean_corr_sigma coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_bias_correction_fpb_med_corr: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: qualityInformation long_name: fpb median corr description: First-photon-bias correction giving the difference between the mean segment height and the corrected median height source: section 3.4.3.2 origname: fpb_med_corr fullnamepath: /gt1l/land_ice_segments/bias_correction/fpb_med_corr coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_bias_correction_fpb_med_corr_sigma: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: qualityInformation long_name: fpb median corr sigma description: Estimated error in fpb_med_corr source: section 3.4.3.2 origname: fpb_med_corr_sigma fullnamepath: /gt1l/land_ice_segments/bias_correction/fpb_med_corr_sigma coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_bias_correction_fpb_n_corr: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: counts contentType: qualityInformation long_name: fpb number photons corr description: Estimated window photon count after first-photon-bias correction source: section 4.3.3.3 origname: fpb_n_corr fullnamepath: /gt1l/land_ice_segments/bias_correction/fpb_n_corr coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_bias_correction_tx_mean_corr: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: qualityInformation long_name: tx shape mean correction 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 source: section 3.5 origname: tx_mean_corr fullnamepath: /gt1l/land_ice_segments/bias_correction/tx_mean_corr coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_bias_correction_med_r_fit: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: qualityInformation long_name: mean median residual description: Difference between uncorrected mean and median of linear fit residuals source: section 3.3.5 origname: med_r_fit fullnamepath: /gt1l/land_ice_segments/bias_correction/med_r_fit coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_land_ice_segments_bias_correction_tx_med_corr: | Array of 32 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] _FillValue: 3.402823466e+38 units: meters contentType: qualityInformation long_name: tx shape median correction 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 source: section 3.5 origname: tx_med_corr fullnamepath: /gt1l/land_ice_segments/bias_correction/tx_med_corr coordinates: gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude |
| gt1l_residual_histogram_count: | Array of 32 bit Integers [gt1l_residual_histogram_delta_time = 0..20][gt1l_residual_histogram_dh = 0..999] units: counts contentType: physicalMeasurement long_name: Bin Counts description: Residual count in 1-cm bins, for PE within 10 (horizontal) m of segment centers for each histogram. source: Section 4.11 origname: count fullnamepath: /gt1l/residual_histogram/count coordinates: gt1l_residual_histogram_delta_time gt1l_residual_histogram_lat_mean gt1l_residual_histogram_lon_mean |
| gt1l_residual_histogram_lat_mean: | Array of 64 bit Reals [gt1l_residual_histogram_delta_time = 0..20] units: degrees_north contentType: physicalMeasurement long_name: Latitude Mean standard_name: latitude description: Mean latitude of the segments included in the histogram source: Section 4.11 valid_min: -90.000000000000000 valid_max: 90.000000000000000 origname: lat_mean fullnamepath: /gt1l/residual_histogram/lat_mean coordinates: gt1l_residual_histogram_delta_time gt1l_residual_histogram_lon_mean |
| gt1l_residual_histogram_bckgrd_per_bin: | Array of 32 bit Reals [gt1l_residual_histogram_delta_time = 0..20] units: 1 contentType: physicalMeasurement long_name: Expected background PEs description: Number of background PE expected for the bins in each column of the histogram based on the observed background rate (bckgrd). source: Section 4.11 origname: bckgrd_per_bin fullnamepath: /gt1l/residual_histogram/bckgrd_per_bin coordinates: gt1l_residual_histogram_delta_time gt1l_residual_histogram_lat_mean gt1l_residual_histogram_lon_mean |
| gt1l_residual_histogram_x_atc_mean: | Array of 64 bit Reals [gt1l_residual_histogram_delta_time = 0..20] units: 1 contentType: physicalMeasurement long_name: Along Track Coordinate Mean description: Mean along-track coordinate of the segments included in the histogram. source: Section 4.11 origname: x_atc_mean fullnamepath: /gt1l/residual_histogram/x_atc_mean coordinates: gt1l_residual_histogram_delta_time gt1l_residual_histogram_lat_mean gt1l_residual_histogram_lon_mean |
| gt1l_residual_histogram_segment_id_list: | Array of 32 bit Integers [gt1l_residual_histogram_delta_time = 0..20][gt1l_residual_histogram_ds_segment_id = 0..9] units: 1 contentType: referenceInformation long_name: Segment ID List description: Segments ids included in each column of the histogram source: Section 4.11 _FillValue: 2147483647 origname: segment_id_list fullnamepath: /gt1l/residual_histogram/segment_id_list coordinates: gt1l_residual_histogram_delta_time gt1l_residual_histogram_lat_mean gt1l_residual_histogram_lon_mean |
| gt1l_residual_histogram_pulse_count: | Array of 32 bit Integers [gt1l_residual_histogram_delta_time = 0..20] units: counts contentType: physicalMeasurement long_name: Number of Histogram Segment Pulses 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). source: Section 4.11 origname: pulse_count fullnamepath: /gt1l/residual_histogram/pulse_count coordinates: gt1l_residual_histogram_delta_time gt1l_residual_histogram_lat_mean gt1l_residual_histogram_lon_mean |
| gt1l_residual_histogram_lon_mean: | Array of 64 bit Reals [gt1l_residual_histogram_delta_time = 0..20] units: degrees_east contentType: physicalMeasurement long_name: Longitude Mean standard_name: longitude description: Mean longitude of the segments included in the histogram source: Section 4.11 valid_min: -180.00000000000000 valid_max: 180.00000000000000 origname: lon_mean fullnamepath: /gt1l/residual_histogram/lon_mean coordinates: gt1l_residual_histogram_delta_time gt1l_residual_histogram_lat_mean |
| gt1l_segment_quality_record_number: | Array of 32 bit Integers [gt1l_segment_quality_delta_time = 0..1519] units: 1 long_name: Land Ice Height Index description: For those segments that have adequate signal strength, this parameter gives the record for the pair within the other groups in the granule. source: section 4.2 contentType: referenceInformation origname: record_number fullnamepath: /gt1l/segment_quality/record_number coordinates: gt1l_segment_quality_delta_time gt1l_segment_quality_reference_pt_lat gt1l_segment_quality_reference_pt_lon |
| gt1l_segment_quality_reference_pt_lat: | Array of 64 bit Reals [gt1l_segment_quality_delta_time = 0..1519] units: degrees_north long_name: Latitude standard_name: latitude description: Latitude of the reference segment location on the RPT source: section 3.1.9 valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation origname: reference_pt_lat fullnamepath: /gt1l/segment_quality/reference_pt_lat coordinates: gt1l_segment_quality_delta_time gt1l_segment_quality_reference_pt_lon |
| gt1l_segment_quality_reference_pt_lon: | Array of 64 bit Reals [gt1l_segment_quality_delta_time = 0..1519] units: degrees_east contentType: referenceInformation long_name: Longitude standard_name: longitude description: Longitude of the reference segment location on the RPT source: section 3.1.9 valid_min: -180.00000000000000 valid_max: 180.00000000000000 origname: reference_pt_lon fullnamepath: /gt1l/segment_quality/reference_pt_lon coordinates: gt1l_segment_quality_delta_time gt1l_segment_quality_reference_pt_lat |
| gt1l_segment_quality_segment_id: | Array of 32 bit Integers [gt1l_segment_quality_delta_time = 0..1519] units: 1 contentType: referenceInformation long_name: Reference Point, m description: Segment number corresponding to the second of two ATL03 segments in the ATL06 segment, counted from the RGT equator crossing source: section 3.1.2.1 origname: segment_id fullnamepath: /gt1l/segment_quality/segment_id coordinates: gt1l_segment_quality_delta_time gt1l_segment_quality_reference_pt_lat gt1l_segment_quality_reference_pt_lon |
| gt1l_segment_quality_signal_selection_source: | Array of 16 bit Integers [gt1l_segment_quality_delta_time = 0..1519] units: 1 contentType: qualityInformation long_name: Signal Selection Source 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. source: section 3.3.3 flag_meanings: succeeded_using_pe succeeded_using_flagged_pe succeeded_using_backup failed flag_values: 0, 1, 2, 3 valid_min: 0 valid_max: 3 origname: signal_selection_source fullnamepath: /gt1l/segment_quality/signal_selection_source coordinates: gt1l_segment_quality_delta_time gt1l_segment_quality_reference_pt_lat gt1l_segment_quality_reference_pt_lon |
| gt1l_segment_quality_signal_selection_status_signal_selection_status_all: | Array of 16 bit Integers [gt1l_segment_quality_delta_time = 0..1519] units: 1 contentType: qualityInformation long_name: Signal Selection Status Flag description: Indicates confidence of the signal-selection algorithm using all ATL03-flagged PEs. 0=Signal selection succeeded using all ATL03-flagged PEs (or algorthm 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 source: section 3.3.3 flag_meanings: succeeded failed_20 failed_10 failed_both flag_values: 0, 1, 2, 3 valid_min: 0 valid_max: 3 origname: signal_selection_status_all fullnamepath: /gt1l/segment_quality/signal_selection_status/signal_selection_status_all coordinates: gt1l_segment_quality_delta_time gt1l_segment_quality_reference_pt_lat gt1l_segment_quality_reference_pt_lon |
| gt1l_segment_quality_signal_selection_status_signal_selection_status_backup: | Array of 16 bit Integers [gt1l_segment_quality_delta_time = 0..1519] units: 1 contentType: qualityInformation long_name: Signal Selection Backup Flag description: Indicates confidence of the signal-selection algorithm using the backup signal finder. 0=Signal selection succeeded using the backup signal finder after centering the window on flagged PE (or backup signal finder not attempted); 1=Signal selection succeeded using the backup signal finder after searching for the strongest-signal window using four adjacent ATL03 segments; 2=Signal selection using the backup signal finder failed the 20-meter spread test; 3=Signal selection using the backup signal finder failed the 10-photon count test; 4=Signal selection using the backup signal finder failed both tests source: section 3.3.3 flag_meanings: succeeded failed_widen failed_20 failed_10 failed_both flag_values: 0, 1, 2, 3, 4 valid_min: 0 valid_max: 4 origname: signal_selection_status_backup fullnamepath: /gt1l/segment_quality/signal_selection_status/signal_selection_status_backup coordinates: gt1l_segment_quality_delta_time gt1l_segment_quality_reference_pt_lat gt1l_segment_quality_reference_pt_lon |
| gt1l_segment_quality_signal_selection_status_signal_selection_status_confident: | Array of 16 bit Integers [gt1l_segment_quality_delta_time = 0..1519] units: 1 contentType: qualityInformation long_name: Signal Selection Confident Flag 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 source: section 3.3.3 flag_meanings: succeeded failed_20 failed_10 failed_both flag_values: 0, 1, 2, 3 valid_min: 0 valid_max: 3 origname: signal_selection_status_confident fullnamepath: /gt1l/segment_quality/signal_selection_status/signal_selection_status_confident coordinates: gt1l_segment_quality_delta_time gt1l_segment_quality_reference_pt_lat gt1l_segment_quality_reference_pt_lon |
| quality_assessment_qa_granule_pass_fail: | Array of 32 bit Integers [FakeDim0 = 0..0] units: 1 contentType: qualityInformation long_name: Granule Pass Flag description: Flag indicating granule quality. 0=granule passes automatic QA. 1=granule fails automatic QA. source: Operations flag_meanings: PASS FAIL flag_values: 0, 1 valid_min: 0 valid_max: 1 origname: qa_granule_pass_fail fullnamepath: /quality_assessment/qa_granule_pass_fail |
| quality_assessment_gt1r_lon_mean: | Array of 64 bit Reals [quality_assessment_gt1r_delta_time = 0..3] units: degrees_east contentType: physicalMeasurement long_name: Longitude Mean standard_name: longitude description: Mean longitude of the 10km segment. source: Section 4.11 valid_min: -180.00000000000000 valid_max: 180.00000000000000 origname: lon_mean fullnamepath: /quality_assessment/gt1r/lon_mean coordinates: quality_assessment_gt1r_delta_time quality_assessment_gt1r_lat_mean |
| quality_assessment_gt1r_signal_selection_source_fraction_0: | Array of 32 bit Reals [quality_assessment_gt1r_delta_time = 0..3] units: 1 contentType: qualityInformation long_name: Signal Selection Source Fraction 0 description: The fraction of 20m segments with signal_selection_source equal to zero. source: section 7.2 valid_min: 0.000000000 valid_max: 1.000000000 origname: signal_selection_source_fraction_0 fullnamepath: /quality_assessment/gt1r/signal_selection_source_fraction_0 coordinates: quality_assessment_gt1r_delta_time quality_assessment_gt1r_lat_mean quality_assessment_gt1r_ quality_assessment_gt1r_lon_mean |
| quality_assessment_gt1r_signal_selection_source_fraction_1: | Array of 32 bit Reals [quality_assessment_gt1r_delta_time = 0..3] units: 1 contentType: qualityInformation long_name: Signal Selection Source Fraction 1 description: The fraction of 20m segments with signal_selection_source equal to 1. source: section 7.2 valid_min: 0.000000000 valid_max: 1.000000000 origname: signal_selection_source_fraction_1 fullnamepath: /quality_assessment/gt1r/signal_selection_source_fraction_1 coordinates: quality_assessment_gt1r_delta_time quality_assessment_gt1r_lat_mean quality_assessment_gt1r_ quality_assessment_gt1r_lon_mean |
| quality_assessment_gt1r_signal_selection_source_fraction_2: | Array of 32 bit Reals [quality_assessment_gt1r_delta_time = 0..3] units: 1 contentType: qualityInformation long_name: Signal Selection Source Fraction 2 description: The fraction of 20m segments with signal_selection_source equal to 2. source: section 7.2 valid_min: 0.000000000 valid_max: 1.000000000 origname: signal_selection_source_fraction_2 fullnamepath: /quality_assessment/gt1r/signal_selection_source_fraction_2 coordinates: quality_assessment_gt1r_delta_time quality_assessment_gt1r_lat_mean quality_assessment_gt1r_ quality_assessment_gt1r_lon_mean |
| quality_assessment_gt1r_lat_mean: | Array of 64 bit Reals [quality_assessment_gt1r_delta_time = 0..3] units: degrees_north contentType: physicalMeasurement long_name: Latitude Mean standard_name: latitude description: Mean latitude of the 10km segment. source: Section 4.11 valid_min: -90.000000000000000 valid_max: 90.000000000000000 origname: lat_mean fullnamepath: /quality_assessment/gt1r/lat_mean coordinates: quality_assessment_gt1r_delta_time quality_assessment_gt1r_lon_mean |
| quality_assessment_gt1r_signal_selection_source_fraction_3: | Array of 32 bit Reals [quality_assessment_gt1r_delta_time = 0..3] units: 1 contentType: qualityInformation long_name: Signal Selection Source Fraction 3 description: The fraction of 20m segments with signal_selection_source equal to 3. source: section 7.2 valid_min: 0.000000000 valid_max: 1.000000000 origname: signal_selection_source_fraction_3 fullnamepath: /quality_assessment/gt1r/signal_selection_source_fraction_3 coordinates: quality_assessment_gt1r_delta_time quality_assessment_gt1r_lat_mean quality_assessment_gt1r_ quality_assessment_gt1r_lon_mean |
| quality_assessment_qa_granule_fail_reason: | Array of 32 bit Integers [FakeDim0 = 0..0] units: 1 contentType: qualityInformation long_name: Granule Failure Reason 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. source: Operations flag_meanings: no_failure PROCESS_ERROR INSUFFICIENT_OUTPUT failure_3 failure_4 OTHER_FAILURE flag_values: 0, 1, 2, 3, 4, 5 valid_min: 0 valid_max: 5 origname: qa_granule_fail_reason fullnamepath: /quality_assessment/qa_granule_fail_reason |
| quality_assessment_gt1l_lon_mean: | Array of 64 bit Reals [quality_assessment_gt1l_delta_time = 0..3] units: degrees_east contentType: physicalMeasurement long_name: Longitude Mean standard_name: longitude description: Mean longitude of the 10km segment. source: Section 4.11 valid_min: -180.00000000000000 valid_max: 180.00000000000000 origname: lon_mean fullnamepath: /quality_assessment/gt1l/lon_mean coordinates: quality_assessment_gt1l_delta_time quality_assessment_gt1l_lat_mean |
| quality_assessment_gt1l_signal_selection_source_fraction_0: | Array of 32 bit Reals [quality_assessment_gt1l_delta_time = 0..3] units: 1 contentType: qualityInformation long_name: Signal Selection Source Fraction 0 description: The fraction of 20m segments with signal_selection_source equal to zero. source: section 7.2 valid_min: 0.000000000 valid_max: 1.000000000 origname: signal_selection_source_fraction_0 fullnamepath: /quality_assessment/gt1l/signal_selection_source_fraction_0 coordinates: quality_assessment_gt1l_delta_time quality_assessment_gt1l_lat_mean quality_assessment_gt1l_ quality_assessment_gt1l_lon_mean |
| quality_assessment_gt1l_signal_selection_source_fraction_1: | Array of 32 bit Reals [quality_assessment_gt1l_delta_time = 0..3] units: 1 contentType: qualityInformation long_name: Signal Selection Source Fraction 1 description: The fraction of 20m segments with signal_selection_source equal to 1. source: section 7.2 valid_min: 0.000000000 valid_max: 1.000000000 origname: signal_selection_source_fraction_1 fullnamepath: /quality_assessment/gt1l/signal_selection_source_fraction_1 coordinates: quality_assessment_gt1l_delta_time quality_assessment_gt1l_lat_mean quality_assessment_gt1l_ quality_assessment_gt1l_lon_mean |
| quality_assessment_gt1l_signal_selection_source_fraction_2: | Array of 32 bit Reals [quality_assessment_gt1l_delta_time = 0..3] units: 1 contentType: qualityInformation long_name: Signal Selection Source Fraction 2 description: The fraction of 20m segments with signal_selection_source equal to 2. source: section 7.2 valid_min: 0.000000000 valid_max: 1.000000000 origname: signal_selection_source_fraction_2 fullnamepath: /quality_assessment/gt1l/signal_selection_source_fraction_2 coordinates: quality_assessment_gt1l_delta_time quality_assessment_gt1l_lat_mean quality_assessment_gt1l_ quality_assessment_gt1l_lon_mean |
| quality_assessment_gt1l_lat_mean: | Array of 64 bit Reals [quality_assessment_gt1l_delta_time = 0..3] units: degrees_north contentType: physicalMeasurement long_name: Latitude Mean standard_name: latitude description: Mean latitude of the 10km segment. source: Section 4.11 valid_min: -90.000000000000000 valid_max: 90.000000000000000 origname: lat_mean fullnamepath: /quality_assessment/gt1l/lat_mean coordinates: quality_assessment_gt1l_delta_time quality_assessment_gt1l_lon_mean |
| quality_assessment_gt1l_signal_selection_source_fraction_3: | Array of 32 bit Reals [quality_assessment_gt1l_delta_time = 0..3] units: 1 contentType: qualityInformation long_name: Signal Selection Source Fraction 3 description: The fraction of 20m segments with signal_selection_source equal to 3. source: section 7.2 valid_min: 0.000000000 valid_max: 1.000000000 origname: signal_selection_source_fraction_3 fullnamepath: /quality_assessment/gt1l/signal_selection_source_fraction_3 coordinates: quality_assessment_gt1l_delta_time quality_assessment_gt1l_lat_mean quality_assessment_gt1l_ quality_assessment_gt1l_lon_mean |
| ancillary_data_release: | Array of Strings [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: Release Number 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. source: Operations origname: release fullnamepath: /ancillary_data/release |
| ancillary_data_end_geoseg: | Array of 32 bit Integers [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: Ending Geolocation Segment 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. source: Derived origname: end_geoseg fullnamepath: /ancillary_data/end_geoseg |
| ancillary_data_version: | Array of Strings [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: Version 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. source: Operations origname: version fullnamepath: /ancillary_data/version |
| ancillary_data_end_region: | Array of 32 bit Integers [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: Ending Region 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. source: Derived origname: end_region fullnamepath: /ancillary_data/end_region |
| ancillary_data_atlas_sdp_gps_epoch: | Array of 64 bit Reals [FakeDim0 = 0..0] units: seconds since 1980-01-06T00:00:00.000000Z contentType: auxiliaryInformation long_name: ATLAS Epoch Offset 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. source: Operations origname: atlas_sdp_gps_epoch fullnamepath: /ancillary_data/atlas_sdp_gps_epoch |
| ancillary_data_end_rgt: | Array of 32 bit Integers [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: Ending Reference Groundtrack 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. source: Derived valid_min: 1 valid_max: 1387 origname: end_rgt fullnamepath: /ancillary_data/end_rgt |
| ancillary_data_end_delta_time: | Array of 64 bit Reals [FakeDim0 = 0..0] units: seconds since 2018-01-01 contentType: auxiliaryInformation long_name: ATLAS End Time (Actual) standard_name: time 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. source: Derived origname: end_delta_time fullnamepath: /ancillary_data/end_delta_time |
| ancillary_data_end_orbit: | Array of 32 bit Integers [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: Ending Orbit Number 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. source: Derived origname: end_orbit fullnamepath: /ancillary_data/end_orbit |
| ancillary_data_start_cycle: | Array of 32 bit Integers [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: Starting Cycle 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. source: Derived valid_min: 0 valid_max: 99 origname: start_cycle fullnamepath: /ancillary_data/start_cycle |
| ancillary_data_data_end_utc: | Array of Strings [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: End UTC Time of Granule (CCSDS-A, Actual) description: UTC (in CCSDS-A format) of the last data point within the granule. source: Derived origname: data_end_utc fullnamepath: /ancillary_data/data_end_utc |
| ancillary_data_control: | Array of Strings [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: Control File description: PGE-specific control file used to generate this granule. To re-use, replace breaks (BR) with linefeeds. source: Operations origname: control fullnamepath: /ancillary_data/control |
| ancillary_data_start_gpssow: | Array of 64 bit Reals [FakeDim0 = 0..0] units: seconds contentType: auxiliaryInformation long_name: Start GPS SOW of Granule (Actual) description: GPS seconds-of-week of the first data point in the granule. source: Derived origname: start_gpssow fullnamepath: /ancillary_data/start_gpssow |
| ancillary_data_granule_end_utc: | Array of Strings [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: End UTC Time of Granule (CCSDS-A, Requested) description: Requested end time (in UTC CCSDS-A) of this granule. source: Derived origname: granule_end_utc fullnamepath: /ancillary_data/granule_end_utc |
| ancillary_data_end_cycle: | Array of 32 bit Integers [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: Ending Cycle description: The ending cycle number associated with the data contained within this granule. The cycle number is the counter of the number of 91-day repeat cycles completed by the mission. source: Derived valid_min: 0 valid_max: 99 origname: end_cycle fullnamepath: /ancillary_data/end_cycle |
| ancillary_data_granule_start_utc: | Array of Strings [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: Start UTC Time of Granule (CCSDS-A, Requested) description: Requested start time (in UTC CCSDS-A) of this granule. source: Derived origname: granule_start_utc fullnamepath: /ancillary_data/granule_start_utc |
| ancillary_data_start_delta_time: | Array of 64 bit Reals [FakeDim0 = 0..0] units: seconds since 2018-01-01 contentType: auxiliaryInformation long_name: ATLAS Start Time (Actual) standard_name: time 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. source: Derived origname: start_delta_time fullnamepath: /ancillary_data/start_delta_time |
| ancillary_data_start_geoseg: | Array of 32 bit Integers [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: Starting Geolocation Segment 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. source: Derived origname: start_geoseg fullnamepath: /ancillary_data/start_geoseg |
| ancillary_data_start_orbit: | Array of 32 bit Integers [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: Starting Orbit Number 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. source: Derived origname: start_orbit fullnamepath: /ancillary_data/start_orbit |
| ancillary_data_data_start_utc: | Array of Strings [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: Start UTC Time of Granule (CCSDS-A, Actual) description: UTC (in CCSDS-A format) of the first data point within the granule. source: Derived origname: data_start_utc fullnamepath: /ancillary_data/data_start_utc |
| ancillary_data_end_gpsweek: | Array of 32 bit Integers [FakeDim0 = 0..0] units: weeks from 1980-01-06 contentType: auxiliaryInformation long_name: Ending GPSWeek of Granule (Actual) description: GPS week number of the last data point in the granule. source: Derived origname: end_gpsweek fullnamepath: /ancillary_data/end_gpsweek |
| ancillary_data_start_rgt: | Array of 32 bit Integers [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: Starting Reference Groundtrack 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. source: Derived valid_min: 1 valid_max: 1387 origname: start_rgt fullnamepath: /ancillary_data/start_rgt |
| ancillary_data_end_gpssow: | Array of 64 bit Reals [FakeDim0 = 0..0] units: seconds contentType: auxiliaryInformation long_name: Ending GPS SOW of Granule (Actual) description: GPS seconds-of-week of the last data point in the granule. source: Derived origname: end_gpssow fullnamepath: /ancillary_data/end_gpssow |
| ancillary_data_land_ice_rbin_width: | Array of 32 bit Reals [FakeDim0 = 0..0] units: meters contentType: auxiliaryInformation long_name: Bin Size description: Residual histogram bin size source: Operations origname: rbin_width fullnamepath: /ancillary_data/land_ice/rbin_width |
| ancillary_data_land_ice_sigma_beam: | Array of 32 bit Reals [FakeDim0 = 0..0] units: meters contentType: auxiliaryInformation long_name: Sigma of Gaussian Footprint description: Spatial sigma of the Gaussian footprint (m) source: Operations origname: sigma_beam fullnamepath: /ancillary_data/land_ice/sigma_beam |
| ancillary_data_land_ice_fit_maxiter: | Array of 32 bit Integers [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: Maximum Iterations of Fit description: Maximum number of iterations in at_seg_fit source: Operations origname: fit_maxiter fullnamepath: /ancillary_data/land_ice/fit_maxiter |
| ancillary_data_land_ice_n_hist: | Array of 32 bit Integers [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: Number of Histogram Bins description: Number of bins in a histogram source: Operations origname: n_hist fullnamepath: /ancillary_data/land_ice/n_hist |
| ancillary_data_land_ice_min_gain_th: | Array of 32 bit Reals [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation description: Minimum estimated gain threshold (3.1.6) source: Operations long_name: Minimum Gain Threshold origname: min_gain_th fullnamepath: /ancillary_data/land_ice/min_gain_th |
| ancillary_data_land_ice_maxiter: | Array of 32 bit Integers [FakeDim0 = 0..0] units: counts contentType: auxiliaryInformation long_name: Maximum Iterations description: Maximum number of iterations in tx_shape_corr source: Operations origname: maxiter fullnamepath: /ancillary_data/land_ice/maxiter |
| ancillary_data_land_ice_n_sigmas: | Array of 32 bit Reals [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: Number of Sigmas description: Multiplied by sigma_expected to get h_win source: Operations origname: n_sigmas fullnamepath: /ancillary_data/land_ice/n_sigmas |
| ancillary_data_land_ice_dt_hist: | Array of 64 bit Reals [FakeDim0 = 0..0] units: seconds contentType: auxiliaryInformation long_name: Histogram Bin Size description: Bin size for histograms (sec) source: Operations origname: dt_hist fullnamepath: /ancillary_data/land_ice/dt_hist |
| ancillary_data_land_ice_sigma_tx: | Array of 32 bit Reals [FakeDim0 = 0..0] units: seconds contentType: auxiliaryInformation long_name: Duration of Transmit Pulse description: Temporal duration of the transmit pulse (sec), calculated from the FWHM of the TEP waveform source: Operations origname: sigma_tx fullnamepath: /ancillary_data/land_ice/sigma_tx |
| ancillary_data_land_ice_min_signal_conf: | Array of 32 bit Integers [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: Minimum Signal Confidence description: Minimum signal confidence level for a photon to be considered valid. source: Operations valid_min: 0 valid_max: 4 origname: min_signal_conf fullnamepath: /ancillary_data/land_ice/min_signal_conf |
| ancillary_data_land_ice_t_dead: | Array of 64 bit Reals [FakeDim0 = 0..0] units: seconds contentType: auxiliaryInformation long_name: Dead-time description: Dead-time for any channel in the detector (sec) source: Operations origname: t_dead fullnamepath: /ancillary_data/land_ice/t_dead |
| ancillary_data_land_ice_min_n_sel: | Array of 32 bit Integers [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: Mininum Number of Photons description: Minimum number of selected PEs in pe_select source: Operations origname: min_n_sel fullnamepath: /ancillary_data/land_ice/min_n_sel |
| ancillary_data_land_ice_max_res_ids: | Array of 32 bit Integers [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: Max Segments description: Maximum number of segment ids in each residual_histogram source: Operations origname: max_res_ids fullnamepath: /ancillary_data/land_ice/max_res_ids |
| ancillary_data_land_ice_proc_interval: | Array of 32 bit Integers [FakeDim0 = 0..0] units: seconds contentType: auxiliaryInformation long_name: Processing Interval description: Processing interval in number of geolocation segments.. source: Operations origname: proc_interval fullnamepath: /ancillary_data/land_ice/proc_interval |
| ancillary_data_land_ice_fpb_maxiter: | Array of 32 bit Integers [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: Maximum Iterations for FPB description: Maximum number of iterations in fpb_corr source: Operations origname: fpb_maxiter fullnamepath: /ancillary_data/land_ice/fpb_maxiter |
| ancillary_data_land_ice_min_n_pe: | Array of 32 bit Integers [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: Minimum Photons description: Minimum # PEs for fit source: Operations origname: min_n_pe fullnamepath: /ancillary_data/land_ice/min_n_pe |
| ancillary_data_land_ice_win_nsig: | Array of 32 bit Reals [FakeDim1 = 0..1] units: 1 contentType: auxiliaryInformation long_name: Sigma Est Multiplier description: Multiplied by sigma_est to get dz_ph_win source: Operations origname: win_nsig fullnamepath: /ancillary_data/land_ice/win_nsig |
| ancillary_data_land_ice_min_dist: | Array of 32 bit Reals [FakeDim0 = 0..0] units: meters contentType: auxiliaryInformation long_name: Minimum Distance description: Min dist between first and last selected PEs source: Operations origname: min_dist fullnamepath: /ancillary_data/land_ice/min_dist |
| ancillary_data_land_ice_nhist_bins: | Array of 32 bit Integers [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: Number of Bins description: Number of bins in residual histogram source: Operations origname: nhist_bins fullnamepath: /ancillary_data/land_ice/nhist_bins |
| ancillary_data_qa_at_interval: | Array of 64 bit Reals [FakeDim0 = 0..0] units: seconds/cell contentType: auxiliaryInformation long_name: QA Along-Track Interval description: Statistics time interval for along-track QA data. source: control origname: qa_at_interval fullnamepath: /ancillary_data/qa_at_interval |
| ancillary_data_start_region: | Array of 32 bit Integers [FakeDim0 = 0..0] units: 1 contentType: auxiliaryInformation long_name: Starting Region 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. source: Derived origname: start_region fullnamepath: /ancillary_data/start_region |
| ancillary_data_start_gpsweek: | Array of 32 bit Integers [FakeDim0 = 0..0] units: weeks from 1980-01-06 contentType: auxiliaryInformation long_name: Start GPSWeek of Granule (Actual) description: GPS week number of the first data point in the granule. source: Derived origname: start_gpsweek fullnamepath: /ancillary_data/start_gpsweek |
| gt1l_land_ice_segments_delta_time: | Array of 64 bit Reals [gt1l_land_ice_segments_delta_time = 0..253] units: seconds since 2018-01-01 contentType: referenceInformation long_name: Elapsed GPS seconds standard_name: time 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. source: section 4.4 coordinates: latitude longitude origname: delta_time fullnamepath: /gt1l/land_ice_segments/delta_time |
| gt1l_residual_histogram_delta_time: | Array of 64 bit Reals [gt1l_residual_histogram_delta_time = 0..20] units: seconds since 2018-01-01 contentType: referenceInformation long_name: Elapsed GPS seconds standard_name: time 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. source: section 4.4 coordinates: lat_mean lon_mean origname: delta_time fullnamepath: /gt1l/residual_histogram/delta_time |
| gt1l_residual_histogram_dh: | Array of 32 bit Reals [gt1l_residual_histogram_dh = 0..999] units: meters contentType: physicalMeasurement long_name: Height Differences description: Height differences between vertical bin centers and the segment height (heights for the histogram) source: Section 4.11 coordinates: delta_time lat_mean lon_mean origname: dh fullnamepath: /gt1l/residual_histogram/dh |
| gt1l_residual_histogram_ds_segment_id: | Array of 16 bit Integers [gt1l_residual_histogram_ds_segment_id = 0..9] units: 1 contentType: auxiliaryInformation long_name: Segment ID Index description: Relative index of each segment_id used in the derivation of the histogram. source: Section 4.11 valid_min: 1 valid_max: 10 origname: ds_segment_id fullnamepath: /gt1l/residual_histogram/ds_segment_id |
| gt1l_segment_quality_delta_time: | Array of 64 bit Reals [gt1l_segment_quality_delta_time = 0..1519] units: seconds since 2018-01-01 contentType: referenceInformation long_name: Elapsed GPS seconds standard_name: time 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. source: ATL03 coordinates: reference_pt_lat reference_pt_lon origname: delta_time fullnamepath: /gt1l/segment_quality/delta_time |
| gt1r_land_ice_segments_delta_time: | Array of 64 bit Reals [gt1r_land_ice_segments_delta_time = 0..253] units: seconds since 2018-01-01 contentType: referenceInformation long_name: Elapsed GPS seconds standard_name: time 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. source: section 4.4 coordinates: latitude longitude origname: delta_time fullnamepath: /gt1r/land_ice_segments/delta_time |
| gt1r_residual_histogram_delta_time: | Array of 64 bit Reals [gt1r_residual_histogram_delta_time = 0..20] units: seconds since 2018-01-01 contentType: referenceInformation long_name: Elapsed GPS seconds standard_name: time 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. source: section 4.4 coordinates: lat_mean lon_mean origname: delta_time fullnamepath: /gt1r/residual_histogram/delta_time |
| gt1r_residual_histogram_dh: | Array of 32 bit Reals [gt1r_residual_histogram_dh = 0..999] units: meters contentType: physicalMeasurement long_name: Height Differences description: Height differences between vertical bin centers and the segment height (heights for the histogram) source: Section 4.11 coordinates: delta_time lat_mean lon_mean origname: dh fullnamepath: /gt1r/residual_histogram/dh |
| gt1r_residual_histogram_ds_segment_id: | Array of 16 bit Integers [gt1r_residual_histogram_ds_segment_id = 0..9] units: 1 contentType: auxiliaryInformation long_name: Segment ID Index description: Relative index of each segment_id used in the derivation of the histogram. source: Section 4.11 valid_min: 1 valid_max: 10 origname: ds_segment_id fullnamepath: /gt1r/residual_histogram/ds_segment_id |
| gt1r_segment_quality_delta_time: | Array of 64 bit Reals [gt1r_segment_quality_delta_time = 0..1519] units: seconds since 2018-01-01 contentType: referenceInformation long_name: Elapsed GPS seconds standard_name: time 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. source: ATL03 coordinates: reference_pt_lat reference_pt_lon origname: delta_time fullnamepath: /gt1r/segment_quality/delta_time |
| orbit_info_crossing_time: | Array of 64 bit Reals [orbit_info_crossing_time = 0..0] units: seconds since 2018-01-01 contentType: referenceInformation long_name: Ascending Node Crossing Time standard_name: time 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. source: POD/PPD origname: crossing_time fullnamepath: /orbit_info/crossing_time |
| orbit_info_sc_orient_time: | Array of 64 bit Reals [orbit_info_sc_orient_time = 0..0] units: seconds since 2018-01-01 contentType: referenceInformation long_name: Time of Last Spacecraft Orientation Change standard_name: time 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. source: POD/PPD origname: sc_orient_time fullnamepath: /orbit_info/sc_orient_time |
| quality_assessment_gt1l_delta_time: | Array of 64 bit Reals [quality_assessment_gt1l_delta_time = 0..3] units: seconds since 2018-01-01 contentType: referenceInformation long_name: Elapsed GPS seconds standard_name: time 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. source: ATL03 coordinates: lat_mean lon_mean origname: delta_time fullnamepath: /quality_assessment/gt1l/delta_time |
| quality_assessment_gt1r_delta_time: | Array of 64 bit Reals [quality_assessment_gt1r_delta_time = 0..3] units: seconds since 2018-01-01 contentType: referenceInformation long_name: Elapsed GPS seconds standard_name: time 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. source: ATL03 coordinates: lat_mean lon_mean origname: delta_time fullnamepath: /quality_assessment/gt1r/delta_time |
| FakeDim0: | Array of 32 bit Integers [FakeDim0 = 0..0] units: level |
| FakeDim1: | Array of 32 bit Integers [FakeDim1 = 0..1] units: level |