| ancillary_data_atlas_sdp_gps_epoch: | 64 bit Real contentType: auxiliaryInformation description: Number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS Standard Data Product (SDP) epoch (2018-01-01:T00.00.00.000000 UTC). Add this value to delta time parameters to compute full gps_seconds (relative to the GPS epoch) for each data point. long_name: ATLAS Epoch Offset source: Operations units: seconds since 1980-01-06T00:00:00.000000Z origname: atlas_sdp_gps_epoch fullnamepath: /ancillary_data/atlas_sdp_gps_epoch |
| ancillary_data_data_end_utc: | String contentType: auxiliaryInformation description: UTC (in CCSDS-A format) of the last data point within the granule. long_name: End UTC Time of Granule (CCSDS-A, Actual) source: Derived units: 1 origname: data_end_utc fullnamepath: /ancillary_data/data_end_utc |
| ancillary_data_data_start_utc: | String contentType: auxiliaryInformation description: UTC (in CCSDS-A format) of the first data point within the granule. long_name: Start UTC Time of Granule (CCSDS-A, Actual) source: Derived units: 1 origname: data_start_utc fullnamepath: /ancillary_data/data_start_utc |
| ancillary_data_end_cycle: | Byte contentType: auxiliaryInformation source: Derived 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. long_name: Ending Cycle units: 1 origname: end_cycle fullnamepath: /ancillary_data/end_cycle |
| ancillary_data_end_delta_time: | 64 bit Real contentType: auxiliaryInformation description: Number of GPS seconds since the ATLAS SDP epoch at the last data point in the file. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name: ATLAS End Time (Actual) source: Derived units: seconds since 2018-01-01 standard_name: time origname: end_delta_time fullnamepath: /ancillary_data/end_delta_time |
| ancillary_data_end_geoseg: | 32 bit Integer contentType: auxiliaryInformation description: The ending geolocation segment number associated with the data contained within this granule. ICESat granule geographic regions are further refined by geolocation segments. During the geolocation process, a geolocation segment is created approximately every 20m from the start of the orbit to the end. The geolocation segments help align the ATLAS strong a weak beams and provide a common segment length for the L2 and higher products. The geolocation segment indices differ slightly from orbit-to-orbit because of the irregular shape of the Earth. The geolocation segment indices on ATL01 and ATL02 are only approximate because beams have not been aligned at the time of their creation. long_name: Ending Geolocation Segment source: Derived units: 1 origname: end_geoseg fullnamepath: /ancillary_data/end_geoseg |
| ancillary_data_end_gpssow: | 64 bit Real contentType: auxiliaryInformation description: GPS seconds-of-week of the last data point in the granule. long_name: Ending GPS SOW of Granule (Actual) source: Derived units: seconds origname: end_gpssow fullnamepath: /ancillary_data/end_gpssow |
| ancillary_data_end_gpsweek: | 32 bit Integer contentType: auxiliaryInformation description: GPS week number of the last data point in the granule. long_name: Ending GPSWeek of Granule (Actual) source: Derived units: weeks from 1980-01-06 origname: end_gpsweek fullnamepath: /ancillary_data/end_gpsweek |
| ancillary_data_end_orbit: | 16 bit Integer contentType: auxiliaryInformation source: Derived description: The ending orbit number associated with the data contained within this granule. The orbit number increments each time the spacecraft completes a full orbit of the Earth. long_name: Ending Orbit Number units: 1 origname: end_orbit fullnamepath: /ancillary_data/end_orbit |
| ancillary_data_end_region: | Byte contentType: auxiliaryInformation description: The ending product-specific region number associated with the data contained within this granule. ICESat-2 data products are separated by geographic regions. The data contained within a specific region are the same for ATL01 and ATL02. ATL03 regions differ slightly because of different geolocation segment locations caused by the irregular shape of the Earth. The region indices for other products are completely independent. long_name: Ending Region source: Derived units: 1 origname: end_region fullnamepath: /ancillary_data/end_region |
| ancillary_data_end_rgt: | 16 bit Unsigned integer contentType: auxiliaryInformation source: Derived description: The ending reference groundtrack (RGT) number associated with the data contained within this granule. There are 1387 reference groundtrack in the ICESat-2 repeat orbit. The reference groundtrack increments each time the spacecraft completes a full orbit of the Earth and resets to 1 each time the spacecraft completes a full cycle. long_name: Ending Reference Groundtrack units: 1 origname: end_rgt fullnamepath: /ancillary_data/end_rgt |
| ancillary_data_granule_end_utc: | String contentType: auxiliaryInformation description: Requested end time (in UTC CCSDS-A) of this granule. long_name: End UTC Time of Granule (CCSDS-A, Requested) source: Derived units: 1 origname: granule_end_utc fullnamepath: /ancillary_data/granule_end_utc |
| ancillary_data_granule_start_utc: | String contentType: auxiliaryInformation description: Requested start time (in UTC CCSDS-A) of this granule. source: Derived long_name: Start UTC Time of Granule (CCSDS-A, Requested) units: 1 origname: granule_start_utc fullnamepath: /ancillary_data/granule_start_utc |
| ancillary_data_release: | String contentType: auxiliaryInformation description: Release number of the granule. The release number is incremented when the software or ancillary data used to create the granule has been changed. long_name: Release Number source: Operations units: 1 origname: release fullnamepath: /ancillary_data/release |
| ancillary_data_resource: | String contentType: auxiliaryInformation description: ATL03 granule used to produce this granule long_name: ATL03 Resource source: Operations units: 1 origname: resource fullnamepath: /ancillary_data/resource |
| ancillary_data_sliderule_commit: | String contentType: auxiliaryInformation source: Operations description: Git commit ID (https://github.com/SlideRuleEarth/sliderule.git) of SlideRule software used to generate this granule long_name: SlideRule Commit units: 1 origname: sliderule_commit fullnamepath: /ancillary_data/sliderule_commit |
| ancillary_data_sliderule_environment: | String contentType: auxiliaryInformation description: Git commit ID (https://github.com/SlideRuleEarth/sliderule.git) of SlideRule environment used to generate this granule long_name: SlideRule Environment source: Operations units: 1 origname: sliderule_environment fullnamepath: /ancillary_data/sliderule_environment |
| ancillary_data_sliderule_version: | String contentType: auxiliaryInformation description: Version of SlideRule software used to generate this granule long_name: SlideRule Version source: Operations units: 1 origname: sliderule_version fullnamepath: /ancillary_data/sliderule_version |
| ancillary_data_start_cycle: | Byte contentType: auxiliaryInformation description: The starting cycle number associated with the data contained within this granule. The cycle number is the counter of the number of 91-day repeat cycles completed by the mission. long_name: Starting Cycle source: Derived units: 1 origname: start_cycle fullnamepath: /ancillary_data/start_cycle |
| ancillary_data_start_delta_time: | 64 bit Real contentType: auxiliaryInformation source: Derived description: Number of GPS seconds since the ATLAS SDP epoch at the first data point in the file. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name: ATLAS Start Time (Actual) units: seconds since 2018-01-01 origname: start_delta_time fullnamepath: /ancillary_data/start_delta_time |
| ancillary_data_start_geoseg: | 32 bit Integer contentType: auxiliaryInformation long_name: Starting Geolocation Segment source: Derived 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. units: 1 origname: start_geoseg fullnamepath: /ancillary_data/start_geoseg |
| ancillary_data_start_gpssow: | 64 bit Real contentType: auxiliaryInformation description: GPS seconds-of-week of the first data point in the granule. long_name: Start GPS SOW of Granule (Actual) source: Derived units: seconds origname: start_gpssow fullnamepath: /ancillary_data/start_gpssow |
| ancillary_data_start_gpsweek: | 32 bit Integer contentType: auxiliaryInformation description: GPS week number of the first data point in the granule. long_name: Start GPSWeek of Granule (Actual) source: Derived units: weeks from 1980-01-06 origname: start_gpsweek fullnamepath: /ancillary_data/start_gpsweek |
| ancillary_data_start_orbit: | 16 bit Integer contentType: auxiliaryInformation description: The starting orbit number associated with the data contained within this granule. The orbit number increments each time the spacecraft completes a full orbit of the Earth. long_name: Starting Orbit Number source: Derived units: 1 origname: start_orbit fullnamepath: /ancillary_data/start_orbit |
| ancillary_data_start_region: | Byte contentType: auxiliaryInformation source: Derived description: The starting product-specific region number associated with the data contained within this granule. ICESat-2 data products are separated by geographic regions. The data contained within a specific region are the same for ATL01 and ATL02. ATL03 regions differ slightly because of different geolocation segment locations caused by the irregular shape of the Earth. The region indices for other products are completely independent. long_name: Starting Region units: 1 origname: start_region fullnamepath: /ancillary_data/start_region |
| ancillary_data_start_rgt: | 16 bit Unsigned integer contentType: auxiliaryInformation description: The starting reference groundtrack (RGT) number associated with the data contained within this granule. There are 1387 reference groundtrack in the ICESat-2 repeat orbit. The reference groundtrack increments each time the spacecraft completes a full orbit of the Earth and resets to 1 each time the spacecraft completes a full cycle. long_name: Starting Reference Groundtrack source: Derived units: 1 origname: start_rgt fullnamepath: /ancillary_data/start_rgt |
| ancillary_data_version: | String contentType: auxiliaryInformation description: Version number of this granule within the release. It is a sequential number corresponding to the number of times the granule has been reprocessed for the current release. long_name: Version source: Operations units: 1 origname: version fullnamepath: /ancillary_data/version |
| gt1l_class_ph: | Array of 16 bit Integers [ = 0..188587] contentType: modelResults description: 0 - unclassified, 1 - other, 40 - bathymetry, 41 - sea surface long_name: Photon classification source: ATL03 units: scalar origname: class_ph fullnamepath: /gt1l/class_ph coordinates: gt1l_delta_time gt1l_lat_ph gt1l_lon_ph |
| gt1l_confidence: | Array of 64 bit Reals [ = 0..188587] contentType: modelResult description: ensemble confidence score from 0.0 to 1.0 where larger numbers represent higher confidence in classification long_name: Ensemble confidence source: ATL03 units: scalar origname: confidence fullnamepath: /gt1l/confidence coordinates: gt1l_delta_time gt1l_lat_ph gt1l_lon_ph |
| gt1l_delta_time: | Array of 64 bit Reals [ = 0..188587] contentType: physicalMeasurement description: The transmit time of a given photon, measured in seconds from the ATLAS Standard Data Product Epoch. Note that multiple received photons associated with a single transmit pulse will have the same delta_time. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name: Elapsed GPS seconds source: ATL03 units: seconds since 2018-01-01 origname: delta_time fullnamepath: /gt1l/delta_time coordinates: gt1l_lat_ph gt1l_lon_ph |
| gt1l_ellipse_h: | Array of 32 bit Reals [ = 0..188587] contentType: physicalMeasurement long_name: Photon WGS84 height source: ATL03 units: meters description: Height of each received photon, relative to the WGS-84 ellipsoid including refraction correction. Note neither the geoid, ocean tide nor the dynamic atmosphere (DAC) corrections are applied to the ellipsoidal heights. origname: ellipse_h fullnamepath: /gt1l/ellipse_h coordinates: gt1l_delta_time gt1l_lat_ph gt1l_lon_ph |
| gt1l_index_ph: | Array of 32 bit Integers [ = 0..188587] contentType: physicalMeasurement description: 0-based index of the photon in the ATL03 heights group long_name: Photon index source: ATL03 units: scalar origname: index_ph fullnamepath: /gt1l/index_ph coordinates: gt1l_delta_time gt1l_lat_ph gt1l_lon_ph |
| gt1l_index_seg: | Array of 32 bit Integers [ = 0..188587] contentType: physicalMeasurement description: 0-based index of the photon in the ATL03 geolocation group long_name: Segment index source: ATL03 units: scalar origname: index_seg fullnamepath: /gt1l/index_seg coordinates: gt1l_delta_time gt1l_lat_ph gt1l_lon_ph |
| gt1l_invalid_kd: | Array of Bytes [ = 0..188587] contentType: modelResult long_name: Invalid Kd description: Indicates that no data was available in the VIIRS Kd490 8-day cycle dataset at the time and location of the photon source: VIIRS Kd490 units: boolean flag_meanings: false, true flag_values: 0, 1 origname: invalid_kd fullnamepath: /gt1l/invalid_kd coordinates: gt1l_delta_time gt1l_lat_ph gt1l_lon_ph |
| gt1l_invalid_wind_speed: | Array of Bytes [ = 0..188587] contentType: modelResult description: Indicates that ATL09 data was not able to be read to determine wind speed long_name: Invalid wind speed source: ATL09 units: boolean flag_meanings: false, true flag_values: 0, 1 origname: invalid_wind_speed fullnamepath: /gt1l/invalid_wind_speed coordinates: gt1l_delta_time gt1l_lat_ph gt1l_lon_ph |
| gt1l_lat_ph: | Array of 64 bit Reals [ = 0..188587] contentType: modelResult long_name: Latitude units: degrees_north standard_name: latitude valid_max: 90.000000000000000 valid_min: -90.000000000000000 description: Latitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. source: ATL03 origname: lat_ph fullnamepath: /gt1l/lat_ph coordinates: gt1l_delta_time gt1l_lon_ph |
| gt1l_lon_ph: | Array of 64 bit Reals [ = 0..188587] contentType: modelResult description: Longitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. long_name: Longitude source: ATL03 units: degrees_east standard_name: longitude valid_max: 180.00000000000000 valid_min: -180.00000000000000 origname: lon_ph fullnamepath: /gt1l/lon_ph coordinates: gt1l_delta_time gt1l_lat_ph |
| gt1l_low_confidence_flag: | Array of Bytes [ = 0..188587] contentType: modelResult source: ATL03 description: There is low confidence that the photon classified as bathymetry is actually bathymetry units: boolean long_name: Low confidence bathymetry flag flag_meanings: false, true flag_values: 0, 1 origname: low_confidence_flag fullnamepath: /gt1l/low_confidence_flag coordinates: gt1l_delta_time gt1l_lat_ph gt1l_lon_ph |
| gt1l_night_flag: | Array of Bytes [ = 0..188587] contentType: modelResult description: The solar elevation was less than 5 degrees at the time and location of the photon long_name: Night flag source: ATL03 units: boolean flag_meanings: false, true flag_values: 0, 1 origname: night_flag fullnamepath: /gt1l/night_flag coordinates: gt1l_delta_time gt1l_lat_ph gt1l_lon_ph |
| gt1l_ortho_h: | Array of 32 bit Reals [ = 0..188587] contentType: physicalMeasurement description: Height of each received photon, relative to the geoid. long_name: Orthometric height source: ATL03 units: meters origname: ortho_h fullnamepath: /gt1l/ortho_h coordinates: gt1l_delta_time gt1l_lat_ph gt1l_lon_ph |
| gt1l_sensor_depth_exceeded: | Array of Bytes [ = 0..188587] contentType: modelResult description: The subaqueous photon is below the maximum depth detectable by the ATLAS sensor given the Kd of the water column long_name: Sensor depth exceeded source: ATL03 units: boolean flag_meanings: false, true flag_values: 0, 1 origname: sensor_depth_exceeded fullnamepath: /gt1l/sensor_depth_exceeded coordinates: gt1l_delta_time gt1l_lat_ph gt1l_lon_ph |
| gt1l_sigma_thu: | Array of 32 bit Reals [ = 0..188587] contentType: physicalMeasurement description: The combination of the aerial and subaqueous horizontal uncertainty for each received photon long_name: Total horizontal uncertainty source: ATL03 units: meters origname: sigma_thu fullnamepath: /gt1l/sigma_thu coordinates: gt1l_delta_time gt1l_lat_ph gt1l_lon_ph |
| gt1l_sigma_tvu: | Array of 32 bit Reals [ = 0..188587] contentType: modelResult description: The combination of the aerial and subaqueous vertical uncertainty for each received photon long_name: Total vertical uncertainty source: ATL03 units: meters origname: sigma_tvu fullnamepath: /gt1l/sigma_tvu coordinates: gt1l_delta_time gt1l_lat_ph gt1l_lon_ph |
| gt1l_surface_h: | Array of 32 bit Reals [ = 0..188587] contentType: modelResult description: The geoid corrected height of the sea surface at the detected photon long_name: Sea surface orthometric height source: ATL03 units: meters origname: surface_h fullnamepath: /gt1l/surface_h coordinates: gt1l_delta_time gt1l_lat_ph gt1l_lon_ph |
| gt1l_x_atc: | Array of 64 bit Reals [ = 0..188587] contentType: modelResult description: Along-track distance in a segment projected to the ellipsoid of the received photon, based on the Along-Track Segment algorithm. Total along track distance can be found by adding this value to the sum of segment lengths measured from the start of the most recent reference groundtrack. long_name: Distance from equator crossing source: ATL03 units: meters origname: x_atc fullnamepath: /gt1l/x_atc coordinates: gt1l_delta_time gt1l_lat_ph gt1l_lon_ph |
| gt1l_y_atc: | Array of 32 bit Reals [ = 0..188587] contentType: modelResult description: Across-track distance projected to the ellipsoid of the received photon from the reference ground track. This is based on the Along-Track Segment algorithm described in Section 3.1 of the ATBD. long_name: Distance off RGT source: ATL03 units: meters origname: y_atc fullnamepath: /gt1l/y_atc coordinates: gt1l_delta_time gt1l_lat_ph gt1l_lon_ph |
| gt1r_class_ph: | Array of 16 bit Integers [ = 0..36267] contentType: modelResults description: 0 - unclassified, 1 - other, 40 - bathymetry, 41 - sea surface long_name: Photon classification source: ATL03 units: scalar origname: class_ph fullnamepath: /gt1r/class_ph coordinates: gt1r_delta_time gt1r_lat_ph gt1r_lon_ph |
| gt1r_confidence: | Array of 64 bit Reals [ = 0..36267] contentType: modelResult description: ensemble confidence score from 0.0 to 1.0 where larger numbers represent higher confidence in classification long_name: Ensemble confidence source: ATL03 units: scalar origname: confidence fullnamepath: /gt1r/confidence coordinates: gt1r_delta_time gt1r_lat_ph gt1r_lon_ph |
| gt1r_delta_time: | Array of 64 bit Reals [ = 0..36267] contentType: physicalMeasurement description: The transmit time of a given photon, measured in seconds from the ATLAS Standard Data Product Epoch. Note that multiple received photons associated with a single transmit pulse will have the same delta_time. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name: Elapsed GPS seconds source: ATL03 units: seconds since 2018-01-01 origname: delta_time fullnamepath: /gt1r/delta_time coordinates: gt1r_lat_ph gt1r_lon_ph |
| gt1r_ellipse_h: | Array of 32 bit Reals [ = 0..36267] contentType: physicalMeasurement description: Height of each received photon, relative to the WGS-84 ellipsoid including refraction correction. Note neither the geoid, ocean tide nor the dynamic atmosphere (DAC) corrections are applied to the ellipsoidal heights. long_name: Photon WGS84 height source: ATL03 units: meters origname: ellipse_h fullnamepath: /gt1r/ellipse_h coordinates: gt1r_delta_time gt1r_lat_ph gt1r_lon_ph |
| gt1r_index_ph: | Array of 32 bit Integers [ = 0..36267] contentType: physicalMeasurement description: 0-based index of the photon in the ATL03 heights group long_name: Photon index source: ATL03 units: scalar origname: index_ph fullnamepath: /gt1r/index_ph coordinates: gt1r_delta_time gt1r_lat_ph gt1r_lon_ph |
| gt1r_index_seg: | Array of 32 bit Integers [ = 0..36267] contentType: physicalMeasurement description: 0-based index of the photon in the ATL03 geolocation group long_name: Segment index source: ATL03 units: scalar origname: index_seg fullnamepath: /gt1r/index_seg coordinates: gt1r_delta_time gt1r_lat_ph gt1r_lon_ph |
| gt1r_invalid_kd: | Array of Bytes [ = 0..36267] contentType: modelResult description: Indicates that no data was available in the VIIRS Kd490 8-day cycle dataset at the time and location of the photon long_name: Invalid Kd source: VIIRS Kd490 units: boolean flag_meanings: false, true flag_values: 0, 1 origname: invalid_kd fullnamepath: /gt1r/invalid_kd coordinates: gt1r_delta_time gt1r_lat_ph gt1r_lon_ph |
| gt1r_invalid_wind_speed: | Array of Bytes [ = 0..36267] contentType: modelResult description: Indicates that ATL09 data was not able to be read to determine wind speed long_name: Invalid wind speed source: ATL09 units: boolean flag_meanings: false, true flag_values: 0, 1 origname: invalid_wind_speed fullnamepath: /gt1r/invalid_wind_speed coordinates: gt1r_delta_time gt1r_lat_ph gt1r_lon_ph |
| gt1r_lat_ph: | Array of 64 bit Reals [ = 0..36267] contentType: modelResult description: Latitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. long_name: Latitude source: ATL03 units: degrees_north standard_name: latitude valid_max: 90.000000000000000 valid_min: -90.000000000000000 origname: lat_ph fullnamepath: /gt1r/lat_ph coordinates: gt1r_delta_time gt1r_lon_ph |
| gt1r_lon_ph: | Array of 64 bit Reals [ = 0..36267] contentType: modelResult description: Longitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. long_name: Longitude source: ATL03 units: degrees_east standard_name: longitude valid_max: 180.00000000000000 valid_min: -180.00000000000000 origname: lon_ph fullnamepath: /gt1r/lon_ph coordinates: gt1r_delta_time gt1r_lat_ph |
| gt1r_low_confidence_flag: | Array of Bytes [ = 0..36267] contentType: modelResult source: ATL03 description: There is low confidence that the photon classified as bathymetry is actually bathymetry long_name: Low confidence bathymetry flag units: boolean flag_meanings: false, true flag_values: 0, 1 origname: low_confidence_flag fullnamepath: /gt1r/low_confidence_flag coordinates: gt1r_delta_time gt1r_lat_ph gt1r_lon_ph |
| gt1r_night_flag: | Array of Bytes [ = 0..36267] contentType: modelResult description: The solar elevation was less than 5 degrees at the time and location of the photon long_name: Night flag source: ATL03 units: boolean flag_meanings: false, true flag_values: 0, 1 origname: night_flag fullnamepath: /gt1r/night_flag coordinates: gt1r_delta_time gt1r_lat_ph gt1r_lon_ph |
| gt1r_ortho_h: | Array of 32 bit Reals [ = 0..36267] contentType: physicalMeasurement description: Height of each received photon, relative to the geoid. long_name: Orthometric height source: ATL03 units: meters origname: ortho_h fullnamepath: /gt1r/ortho_h coordinates: gt1r_delta_time gt1r_lat_ph gt1r_lon_ph |
| gt1r_sensor_depth_exceeded: | Array of Bytes [ = 0..36267] contentType: modelResult description: The subaqueous photon is below the maximum depth detectable by the ATLAS sensor given the Kd of the water column long_name: Sensor depth exceeded source: ATL03 units: boolean flag_meanings: false, true flag_values: 0, 1 origname: sensor_depth_exceeded fullnamepath: /gt1r/sensor_depth_exceeded coordinates: gt1r_delta_time gt1r_lat_ph gt1r_lon_ph |
| gt1r_sigma_thu: | Array of 32 bit Reals [ = 0..36267] contentType: physicalMeasurement description: The combination of the aerial and subaqueous horizontal uncertainty for each received photon long_name: Total horizontal uncertainty source: ATL03 units: meters origname: sigma_thu fullnamepath: /gt1r/sigma_thu coordinates: gt1r_delta_time gt1r_lat_ph gt1r_lon_ph |
| gt1r_sigma_tvu: | Array of 32 bit Reals [ = 0..36267] contentType: modelResult description: The combination of the aerial and subaqueous vertical uncertainty for each received photon long_name: Total vertical uncertainty source: ATL03 units: meters origname: sigma_tvu fullnamepath: /gt1r/sigma_tvu coordinates: gt1r_delta_time gt1r_lat_ph gt1r_lon_ph |
| gt1r_surface_h: | Array of 32 bit Reals [ = 0..36267] contentType: modelResult description: The geoid corrected height of the sea surface at the detected photon long_name: Sea surface orthometric height source: ATL03 units: meters origname: surface_h fullnamepath: /gt1r/surface_h coordinates: gt1r_delta_time gt1r_lat_ph gt1r_lon_ph |
| gt1r_x_atc: | Array of 64 bit Reals [ = 0..36267] contentType: modelResult description: Along-track distance in a segment projected to the ellipsoid of the received photon, based on the Along-Track Segment algorithm. Total along track distance can be found by adding this value to the sum of segment lengths measured from the start of the most recent reference groundtrack. long_name: Distance from equator crossing source: ATL03 units: meters origname: x_atc fullnamepath: /gt1r/x_atc coordinates: gt1r_delta_time gt1r_lat_ph gt1r_lon_ph |
| gt1r_y_atc: | Array of 32 bit Reals [ = 0..36267] contentType: modelResult description: Across-track distance projected to the ellipsoid of the received photon from the reference ground track. This is based on the Along-Track Segment algorithm described in Section 3.1 of the ATBD. long_name: Distance off RGT source: ATL03 units: meters origname: y_atc fullnamepath: /gt1r/y_atc coordinates: gt1r_delta_time gt1r_lat_ph gt1r_lon_ph |
| gt2l_class_ph: | Array of 16 bit Integers [ = 0..106046] contentType: modelResults description: 0 - unclassified, 1 - other, 40 - bathymetry, 41 - sea surface long_name: Photon classification source: ATL03 units: scalar origname: class_ph fullnamepath: /gt2l/class_ph coordinates: gt2l_delta_time gt2l_lat_ph gt2l_lon_ph |
| gt2l_confidence: | Array of 64 bit Reals [ = 0..106046] contentType: modelResult description: ensemble confidence score from 0.0 to 1.0 where larger numbers represent higher confidence in classification long_name: Ensemble confidence source: ATL03 units: scalar origname: confidence fullnamepath: /gt2l/confidence coordinates: gt2l_delta_time gt2l_lat_ph gt2l_lon_ph |
| gt2l_delta_time: | Array of 64 bit Reals [ = 0..106046] contentType: physicalMeasurement description: The transmit time of a given photon, measured in seconds from the ATLAS Standard Data Product Epoch. Note that multiple received photons associated with a single transmit pulse will have the same delta_time. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name: Elapsed GPS seconds source: ATL03 units: seconds since 2018-01-01 origname: delta_time fullnamepath: /gt2l/delta_time coordinates: gt2l_lat_ph gt2l_lon_ph |
| gt2l_ellipse_h: | Array of 32 bit Reals [ = 0..106046] contentType: physicalMeasurement description: Height of each received photon, relative to the WGS-84 ellipsoid including refraction correction. Note neither the geoid, ocean tide nor the dynamic atmosphere (DAC) corrections are applied to the ellipsoidal heights. long_name: Photon WGS84 height source: ATL03 units: meters origname: ellipse_h fullnamepath: /gt2l/ellipse_h coordinates: gt2l_delta_time gt2l_lat_ph gt2l_lon_ph |
| gt2l_index_ph: | Array of 32 bit Integers [ = 0..106046] contentType: physicalMeasurement description: 0-based index of the photon in the ATL03 heights group long_name: Photon index source: ATL03 units: scalar origname: index_ph fullnamepath: /gt2l/index_ph coordinates: gt2l_delta_time gt2l_lat_ph gt2l_lon_ph |
| gt2l_index_seg: | Array of 32 bit Integers [ = 0..106046] contentType: physicalMeasurement description: 0-based index of the photon in the ATL03 geolocation group long_name: Segment index source: ATL03 units: scalar origname: index_seg fullnamepath: /gt2l/index_seg coordinates: gt2l_delta_time gt2l_lat_ph gt2l_lon_ph |
| gt2l_invalid_kd: | Array of Bytes [ = 0..106046] contentType: modelResult description: Indicates that no data was available in the VIIRS Kd490 8-day cycle dataset at the time and location of the photon long_name: Invalid Kd source: VIIRS Kd490 units: boolean flag_meanings: false, true flag_values: 0, 1 origname: invalid_kd fullnamepath: /gt2l/invalid_kd coordinates: gt2l_delta_time gt2l_lat_ph gt2l_lon_ph |
| gt2l_invalid_wind_speed: | Array of Bytes [ = 0..106046] contentType: modelResult description: Indicates that ATL09 data was not able to be read to determine wind speed long_name: Invalid wind speed source: ATL09 units: boolean flag_meanings: false, true flag_values: 0, 1 origname: invalid_wind_speed fullnamepath: /gt2l/invalid_wind_speed coordinates: gt2l_delta_time gt2l_lat_ph gt2l_lon_ph |
| gt2l_lat_ph: | Array of 64 bit Reals [ = 0..106046] contentType: modelResult description: Latitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. long_name: Latitude source: ATL03 units: degrees_north standard_name: latitude valid_max: 90.000000000000000 valid_min: -90.000000000000000 origname: lat_ph fullnamepath: /gt2l/lat_ph coordinates: gt2l_delta_time gt2l_lon_ph |
| gt2l_lon_ph: | Array of 64 bit Reals [ = 0..106046] contentType: modelResult description: Longitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. long_name: Longitude source: ATL03 units: degrees_east standard_name: longitude valid_max: 180.00000000000000 valid_min: -180.00000000000000 origname: lon_ph fullnamepath: /gt2l/lon_ph coordinates: gt2l_delta_time gt2l_lat_ph |
| gt2l_low_confidence_flag: | Array of Bytes [ = 0..106046] contentType: modelResult source: ATL03 description: There is low confidence that the photon classified as bathymetry is actually bathymetry long_name: Low confidence bathymetry flag units: boolean flag_meanings: false, true flag_values: 0, 1 origname: low_confidence_flag fullnamepath: /gt2l/low_confidence_flag coordinates: gt2l_delta_time gt2l_lat_ph gt2l_lon_ph |
| gt2l_night_flag: | Array of Bytes [ = 0..106046] contentType: modelResult description: The solar elevation was less than 5 degrees at the time and location of the photon long_name: Night flag source: ATL03 units: boolean flag_meanings: false, true flag_values: 0, 1 origname: night_flag fullnamepath: /gt2l/night_flag coordinates: gt2l_delta_time gt2l_lat_ph gt2l_lon_ph |
| gt2l_ortho_h: | Array of 32 bit Reals [ = 0..106046] contentType: physicalMeasurement description: Height of each received photon, relative to the geoid. long_name: Orthometric height source: ATL03 units: meters origname: ortho_h fullnamepath: /gt2l/ortho_h coordinates: gt2l_delta_time gt2l_lat_ph gt2l_lon_ph |
| gt2l_sensor_depth_exceeded: | Array of Bytes [ = 0..106046] contentType: modelResult description: The subaqueous photon is below the maximum depth detectable by the ATLAS sensor given the Kd of the water column long_name: Sensor depth exceeded source: ATL03 units: boolean flag_meanings: false, true flag_values: 0, 1 origname: sensor_depth_exceeded fullnamepath: /gt2l/sensor_depth_exceeded coordinates: gt2l_delta_time gt2l_lat_ph gt2l_lon_ph |
| gt2l_sigma_thu: | Array of 32 bit Reals [ = 0..106046] contentType: physicalMeasurement description: The combination of the aerial and subaqueous horizontal uncertainty for each received photon long_name: Total horizontal uncertainty source: ATL03 units: meters origname: sigma_thu fullnamepath: /gt2l/sigma_thu coordinates: gt2l_delta_time gt2l_lat_ph gt2l_lon_ph |
| gt2l_sigma_tvu: | Array of 32 bit Reals [ = 0..106046] contentType: modelResult description: The combination of the aerial and subaqueous vertical uncertainty for each received photon long_name: Total vertical uncertainty source: ATL03 units: meters origname: sigma_tvu fullnamepath: /gt2l/sigma_tvu coordinates: gt2l_delta_time gt2l_lat_ph gt2l_lon_ph |
| gt2l_surface_h: | Array of 32 bit Reals [ = 0..106046] contentType: modelResult description: The geoid corrected height of the sea surface at the detected photon long_name: Sea surface orthometric height source: ATL03 units: meters origname: surface_h fullnamepath: /gt2l/surface_h coordinates: gt2l_delta_time gt2l_lat_ph gt2l_lon_ph |
| gt2l_x_atc: | Array of 64 bit Reals [ = 0..106046] contentType: modelResult description: Along-track distance in a segment projected to the ellipsoid of the received photon, based on the Along-Track Segment algorithm. Total along track distance can be found by adding this value to the sum of segment lengths measured from the start of the most recent reference groundtrack. long_name: Distance from equator crossing source: ATL03 units: meters origname: x_atc fullnamepath: /gt2l/x_atc coordinates: gt2l_delta_time gt2l_lat_ph gt2l_lon_ph |
| gt2l_y_atc: | Array of 32 bit Reals [ = 0..106046] contentType: modelResult description: Across-track distance projected to the ellipsoid of the received photon from the reference ground track. This is based on the Along-Track Segment algorithm described in Section 3.1 of the ATBD. long_name: Distance off RGT source: ATL03 units: meters origname: y_atc fullnamepath: /gt2l/y_atc coordinates: gt2l_delta_time gt2l_lat_ph gt2l_lon_ph |
| gt2r_class_ph: | Array of 16 bit Integers [ = 0..29728] contentType: modelResults description: 0 - unclassified, 1 - other, 40 - bathymetry, 41 - sea surface long_name: Photon classification source: ATL03 units: scalar origname: class_ph fullnamepath: /gt2r/class_ph coordinates: gt2r_delta_time gt2r_lat_ph gt2r_lon_ph |
| gt2r_confidence: | Array of 64 bit Reals [ = 0..29728] contentType: modelResult description: ensemble confidence score from 0.0 to 1.0 where larger numbers represent higher confidence in classification long_name: Ensemble confidence source: ATL03 units: scalar origname: confidence fullnamepath: /gt2r/confidence coordinates: gt2r_delta_time gt2r_lat_ph gt2r_lon_ph |
| gt2r_delta_time: | Array of 64 bit Reals [ = 0..29728] contentType: physicalMeasurement description: The transmit time of a given photon, measured in seconds from the ATLAS Standard Data Product Epoch. Note that multiple received photons associated with a single transmit pulse will have the same delta_time. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name: Elapsed GPS seconds source: ATL03 units: seconds since 2018-01-01 origname: delta_time fullnamepath: /gt2r/delta_time coordinates: gt2r_lat_ph gt2r_lon_ph |
| gt2r_ellipse_h: | Array of 32 bit Reals [ = 0..29728] contentType: physicalMeasurement description: Height of each received photon, relative to the WGS-84 ellipsoid including refraction correction. Note neither the geoid, ocean tide nor the dynamic atmosphere (DAC) corrections are applied to the ellipsoidal heights. long_name: Photon WGS84 height source: ATL03 units: meters origname: ellipse_h fullnamepath: /gt2r/ellipse_h coordinates: gt2r_delta_time gt2r_lat_ph gt2r_lon_ph |
| gt2r_index_ph: | Array of 32 bit Integers [ = 0..29728] contentType: physicalMeasurement description: 0-based index of the photon in the ATL03 heights group long_name: Photon index source: ATL03 units: scalar origname: index_ph fullnamepath: /gt2r/index_ph coordinates: gt2r_delta_time gt2r_lat_ph gt2r_lon_ph |
| gt2r_index_seg: | Array of 32 bit Integers [ = 0..29728] contentType: physicalMeasurement description: 0-based index of the photon in the ATL03 geolocation group long_name: Segment index source: ATL03 units: scalar origname: index_seg fullnamepath: /gt2r/index_seg coordinates: gt2r_delta_time gt2r_lat_ph gt2r_lon_ph |
| gt2r_invalid_kd: | Array of Bytes [ = 0..29728] contentType: modelResult description: Indicates that no data was available in the VIIRS Kd490 8-day cycle dataset at the time and location of the photon long_name: Invalid Kd source: VIIRS Kd490 units: boolean flag_meanings: false, true flag_values: 0, 1 origname: invalid_kd fullnamepath: /gt2r/invalid_kd coordinates: gt2r_delta_time gt2r_lat_ph gt2r_lon_ph |
| gt2r_invalid_wind_speed: | Array of Bytes [ = 0..29728] contentType: modelResult description: Indicates that ATL09 data was not able to be read to determine wind speed long_name: Invalid wind speed source: ATL09 units: boolean flag_meanings: false, true flag_values: 0, 1 origname: invalid_wind_speed fullnamepath: /gt2r/invalid_wind_speed coordinates: gt2r_delta_time gt2r_lat_ph gt2r_lon_ph |
| gt2r_lat_ph: | Array of 64 bit Reals [ = 0..29728] contentType: modelResult description: Latitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. long_name: Latitude source: ATL03 units: degrees_north standard_name: latitude valid_max: 90.000000000000000 valid_min: -90.000000000000000 origname: lat_ph fullnamepath: /gt2r/lat_ph coordinates: gt2r_delta_time gt2r_lon_ph |
| gt2r_lon_ph: | Array of 64 bit Reals [ = 0..29728] contentType: modelResult description: Longitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. long_name: Longitude source: ATL03 units: degrees_east standard_name: longitude valid_max: 180.00000000000000 valid_min: -180.00000000000000 origname: lon_ph fullnamepath: /gt2r/lon_ph coordinates: gt2r_delta_time gt2r_lat_ph |
| gt2r_low_confidence_flag: | Array of Bytes [ = 0..29728] contentType: modelResult source: ATL03 description: There is low confidence that the photon classified as bathymetry is actually bathymetry long_name: Low confidence bathymetry flag units: boolean flag_meanings: false, true flag_values: 0, 1 origname: low_confidence_flag fullnamepath: /gt2r/low_confidence_flag coordinates: gt2r_delta_time gt2r_lat_ph gt2r_lon_ph |
| gt2r_night_flag: | Array of Bytes [ = 0..29728] contentType: modelResult description: The solar elevation was less than 5 degrees at the time and location of the photon long_name: Night flag source: ATL03 units: boolean flag_meanings: false, true flag_values: 0, 1 origname: night_flag fullnamepath: /gt2r/night_flag coordinates: gt2r_delta_time gt2r_lat_ph gt2r_lon_ph |
| gt2r_ortho_h: | Array of 32 bit Reals [ = 0..29728] contentType: physicalMeasurement description: Height of each received photon, relative to the geoid. long_name: Orthometric height source: ATL03 units: meters origname: ortho_h fullnamepath: /gt2r/ortho_h coordinates: gt2r_delta_time gt2r_lat_ph gt2r_lon_ph |
| gt2r_sensor_depth_exceeded: | Array of Bytes [ = 0..29728] contentType: modelResult description: The subaqueous photon is below the maximum depth detectable by the ATLAS sensor given the Kd of the water column long_name: Sensor depth exceeded source: ATL03 units: boolean flag_meanings: false, true flag_values: 0, 1 origname: sensor_depth_exceeded fullnamepath: /gt2r/sensor_depth_exceeded coordinates: gt2r_delta_time gt2r_lat_ph gt2r_lon_ph |
| gt2r_sigma_thu: | Array of 32 bit Reals [ = 0..29728] contentType: physicalMeasurement description: The combination of the aerial and subaqueous horizontal uncertainty for each received photon long_name: Total horizontal uncertainty source: ATL03 units: meters origname: sigma_thu fullnamepath: /gt2r/sigma_thu coordinates: gt2r_delta_time gt2r_lat_ph gt2r_lon_ph |
| gt2r_sigma_tvu: | Array of 32 bit Reals [ = 0..29728] contentType: modelResult description: The combination of the aerial and subaqueous vertical uncertainty for each received photon long_name: Total vertical uncertainty source: ATL03 units: meters origname: sigma_tvu fullnamepath: /gt2r/sigma_tvu coordinates: gt2r_delta_time gt2r_lat_ph gt2r_lon_ph |
| gt2r_surface_h: | Array of 32 bit Reals [ = 0..29728] contentType: modelResult description: The geoid corrected height of the sea surface at the detected photon long_name: Sea surface orthometric height source: ATL03 units: meters origname: surface_h fullnamepath: /gt2r/surface_h coordinates: gt2r_delta_time gt2r_lat_ph gt2r_lon_ph |
| gt2r_x_atc: | Array of 64 bit Reals [ = 0..29728] contentType: modelResult description: Along-track distance in a segment projected to the ellipsoid of the received photon, based on the Along-Track Segment algorithm. Total along track distance can be found by adding this value to the sum of segment lengths measured from the start of the most recent reference groundtrack. long_name: Distance from equator crossing source: ATL03 units: meters origname: x_atc fullnamepath: /gt2r/x_atc coordinates: gt2r_delta_time gt2r_lat_ph gt2r_lon_ph |
| gt2r_y_atc: | Array of 32 bit Reals [ = 0..29728] contentType: modelResult description: Across-track distance projected to the ellipsoid of the received photon from the reference ground track. This is based on the Along-Track Segment algorithm described in Section 3.1 of the ATBD. long_name: Distance off RGT source: ATL03 units: meters origname: y_atc fullnamepath: /gt2r/y_atc coordinates: gt2r_delta_time gt2r_lat_ph gt2r_lon_ph |
| gt3l_class_ph: | Array of 16 bit Integers [ = 0..122727] contentType: modelResults description: 0 - unclassified, 1 - other, 40 - bathymetry, 41 - sea surface long_name: Photon classification source: ATL03 units: scalar origname: class_ph fullnamepath: /gt3l/class_ph coordinates: gt3l_delta_time gt3l_lat_ph gt3l_lon_ph |
| gt3l_confidence: | Array of 64 bit Reals [ = 0..122727] contentType: modelResult description: ensemble confidence score from 0.0 to 1.0 where larger numbers represent higher confidence in classification long_name: Ensemble confidence source: ATL03 units: scalar origname: confidence fullnamepath: /gt3l/confidence coordinates: gt3l_delta_time gt3l_lat_ph gt3l_lon_ph |
| gt3l_delta_time: | Array of 64 bit Reals [ = 0..122727] contentType: physicalMeasurement description: The transmit time of a given photon, measured in seconds from the ATLAS Standard Data Product Epoch. Note that multiple received photons associated with a single transmit pulse will have the same delta_time. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name: Elapsed GPS seconds source: ATL03 units: seconds since 2018-01-01 origname: delta_time fullnamepath: /gt3l/delta_time coordinates: gt3l_lat_ph gt3l_lon_ph |
| gt3l_ellipse_h: | Array of 32 bit Reals [ = 0..122727] contentType: physicalMeasurement description: Height of each received photon, relative to the WGS-84 ellipsoid including refraction correction. Note neither the geoid, ocean tide nor the dynamic atmosphere (DAC) corrections are applied to the ellipsoidal heights. long_name: Photon WGS84 height source: ATL03 units: meters origname: ellipse_h fullnamepath: /gt3l/ellipse_h coordinates: gt3l_delta_time gt3l_lat_ph gt3l_lon_ph |
| gt3l_index_ph: | Array of 32 bit Integers [ = 0..122727] contentType: physicalMeasurement description: 0-based index of the photon in the ATL03 heights group long_name: Photon index source: ATL03 units: scalar origname: index_ph fullnamepath: /gt3l/index_ph coordinates: gt3l_delta_time gt3l_lat_ph gt3l_lon_ph |
| gt3l_index_seg: | Array of 32 bit Integers [ = 0..122727] contentType: physicalMeasurement description: 0-based index of the photon in the ATL03 geolocation group long_name: Segment index source: ATL03 units: scalar origname: index_seg fullnamepath: /gt3l/index_seg coordinates: gt3l_delta_time gt3l_lat_ph gt3l_lon_ph |
| gt3l_invalid_kd: | Array of Bytes [ = 0..122727] contentType: modelResult description: Indicates that no data was available in the VIIRS Kd490 8-day cycle dataset at the time and location of the photon long_name: Invalid Kd source: VIIRS Kd490 units: boolean flag_meanings: false, true flag_values: 0, 1 origname: invalid_kd fullnamepath: /gt3l/invalid_kd coordinates: gt3l_delta_time gt3l_lat_ph gt3l_lon_ph |
| gt3l_invalid_wind_speed: | Array of Bytes [ = 0..122727] contentType: modelResult description: Indicates that ATL09 data was not able to be read to determine wind speed long_name: Invalid wind speed source: ATL09 units: boolean flag_meanings: false, true flag_values: 0, 1 origname: invalid_wind_speed fullnamepath: /gt3l/invalid_wind_speed coordinates: gt3l_delta_time gt3l_lat_ph gt3l_lon_ph |
| gt3l_lat_ph: | Array of 64 bit Reals [ = 0..122727] contentType: modelResult description: Latitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. long_name: Latitude source: ATL03 units: degrees_north standard_name: latitude valid_max: 90.000000000000000 valid_min: -90.000000000000000 origname: lat_ph fullnamepath: /gt3l/lat_ph coordinates: gt3l_delta_time gt3l_lon_ph |
| gt3l_lon_ph: | Array of 64 bit Reals [ = 0..122727] contentType: modelResult description: Longitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. long_name: Longitude source: ATL03 units: degrees_east standard_name: longitude valid_max: 180.00000000000000 valid_min: -180.00000000000000 origname: lon_ph fullnamepath: /gt3l/lon_ph coordinates: gt3l_delta_time gt3l_lat_ph |
| gt3l_low_confidence_flag: | Array of Bytes [ = 0..122727] contentType: modelResult source: ATL03 description: There is low confidence that the photon classified as bathymetry is actually bathymetry long_name: Low confidence bathymetry flag units: boolean flag_meanings: false, true flag_values: 0, 1 origname: low_confidence_flag fullnamepath: /gt3l/low_confidence_flag coordinates: gt3l_delta_time gt3l_lat_ph gt3l_lon_ph |
| gt3l_night_flag: | Array of Bytes [ = 0..122727] contentType: modelResult description: The solar elevation was less than 5 degrees at the time and location of the photon long_name: Night flag source: ATL03 units: boolean flag_meanings: false, true flag_values: 0, 1 origname: night_flag fullnamepath: /gt3l/night_flag coordinates: gt3l_delta_time gt3l_lat_ph gt3l_lon_ph |
| gt3l_ortho_h: | Array of 32 bit Reals [ = 0..122727] contentType: physicalMeasurement description: Height of each received photon, relative to the geoid. long_name: Orthometric height source: ATL03 units: meters origname: ortho_h fullnamepath: /gt3l/ortho_h coordinates: gt3l_delta_time gt3l_lat_ph gt3l_lon_ph |
| gt3l_sensor_depth_exceeded: | Array of Bytes [ = 0..122727] contentType: modelResult description: The subaqueous photon is below the maximum depth detectable by the ATLAS sensor given the Kd of the water column long_name: Sensor depth exceeded source: ATL03 units: boolean flag_meanings: false, true flag_values: 0, 1 origname: sensor_depth_exceeded fullnamepath: /gt3l/sensor_depth_exceeded coordinates: gt3l_delta_time gt3l_lat_ph gt3l_lon_ph |
| gt3l_sigma_thu: | Array of 32 bit Reals [ = 0..122727] contentType: physicalMeasurement description: The combination of the aerial and subaqueous horizontal uncertainty for each received photon long_name: Total horizontal uncertainty source: ATL03 units: meters origname: sigma_thu fullnamepath: /gt3l/sigma_thu coordinates: gt3l_delta_time gt3l_lat_ph gt3l_lon_ph |
| gt3l_sigma_tvu: | Array of 32 bit Reals [ = 0..122727] contentType: modelResult description: The combination of the aerial and subaqueous vertical uncertainty for each received photon long_name: Total vertical uncertainty source: ATL03 units: meters origname: sigma_tvu fullnamepath: /gt3l/sigma_tvu coordinates: gt3l_delta_time gt3l_lat_ph gt3l_lon_ph |
| gt3l_surface_h: | Array of 32 bit Reals [ = 0..122727] contentType: modelResult description: The geoid corrected height of the sea surface at the detected photon long_name: Sea surface orthometric height source: ATL03 units: meters origname: surface_h fullnamepath: /gt3l/surface_h coordinates: gt3l_delta_time gt3l_lat_ph gt3l_lon_ph |
| gt3l_x_atc: | Array of 64 bit Reals [ = 0..122727] contentType: modelResult description: Along-track distance in a segment projected to the ellipsoid of the received photon, based on the Along-Track Segment algorithm. Total along track distance can be found by adding this value to the sum of segment lengths measured from the start of the most recent reference groundtrack. long_name: Distance from equator crossing source: ATL03 units: meters origname: x_atc fullnamepath: /gt3l/x_atc coordinates: gt3l_delta_time gt3l_lat_ph gt3l_lon_ph |
| gt3l_y_atc: | Array of 32 bit Reals [ = 0..122727] contentType: modelResult description: Across-track distance projected to the ellipsoid of the received photon from the reference ground track. This is based on the Along-Track Segment algorithm described in Section 3.1 of the ATBD. long_name: Distance off RGT source: ATL03 units: meters origname: y_atc fullnamepath: /gt3l/y_atc coordinates: gt3l_delta_time gt3l_lat_ph gt3l_lon_ph |
| gt3r_class_ph: | Array of 16 bit Integers [ = 0..29322] contentType: modelResults description: 0 - unclassified, 1 - other, 40 - bathymetry, 41 - sea surface long_name: Photon classification source: ATL03 units: scalar origname: class_ph fullnamepath: /gt3r/class_ph coordinates: gt3r_delta_time gt3r_lat_ph gt3r_lon_ph |
| gt3r_confidence: | Array of 64 bit Reals [ = 0..29322] contentType: modelResult description: ensemble confidence score from 0.0 to 1.0 where larger numbers represent higher confidence in classification long_name: Ensemble confidence source: ATL03 units: scalar origname: confidence fullnamepath: /gt3r/confidence coordinates: gt3r_delta_time gt3r_lat_ph gt3r_lon_ph |
| gt3r_delta_time: | Array of 64 bit Reals [ = 0..29322] contentType: physicalMeasurement description: The transmit time of a given photon, measured in seconds from the ATLAS Standard Data Product Epoch. Note that multiple received photons associated with a single transmit pulse will have the same delta_time. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name: Elapsed GPS seconds source: ATL03 units: seconds since 2018-01-01 origname: delta_time fullnamepath: /gt3r/delta_time coordinates: gt3r_lat_ph gt3r_lon_ph |
| gt3r_ellipse_h: | Array of 32 bit Reals [ = 0..29322] contentType: physicalMeasurement description: Height of each received photon, relative to the WGS-84 ellipsoid including refraction correction. Note neither the geoid, ocean tide nor the dynamic atmosphere (DAC) corrections are applied to the ellipsoidal heights. long_name: Photon WGS84 height source: ATL03 units: meters origname: ellipse_h fullnamepath: /gt3r/ellipse_h coordinates: gt3r_delta_time gt3r_lat_ph gt3r_lon_ph |
| gt3r_index_ph: | Array of 32 bit Integers [ = 0..29322] contentType: physicalMeasurement description: 0-based index of the photon in the ATL03 heights group long_name: Photon index source: ATL03 units: scalar origname: index_ph fullnamepath: /gt3r/index_ph coordinates: gt3r_delta_time gt3r_lat_ph gt3r_lon_ph |
| gt3r_index_seg: | Array of 32 bit Integers [ = 0..29322] contentType: physicalMeasurement description: 0-based index of the photon in the ATL03 geolocation group long_name: Segment index source: ATL03 units: scalar origname: index_seg fullnamepath: /gt3r/index_seg coordinates: gt3r_delta_time gt3r_lat_ph gt3r_lon_ph |
| gt3r_invalid_kd: | Array of Bytes [ = 0..29322] contentType: modelResult description: Indicates that no data was available in the VIIRS Kd490 8-day cycle dataset at the time and location of the photon long_name: Invalid Kd source: VIIRS Kd490 units: boolean flag_meanings: false, true flag_values: 0, 1 origname: invalid_kd fullnamepath: /gt3r/invalid_kd coordinates: gt3r_delta_time gt3r_lat_ph gt3r_lon_ph |
| gt3r_invalid_wind_speed: | Array of Bytes [ = 0..29322] contentType: modelResult description: Indicates that ATL09 data was not able to be read to determine wind speed long_name: Invalid wind speed source: ATL09 units: boolean flag_meanings: false, true flag_values: 0, 1 origname: invalid_wind_speed fullnamepath: /gt3r/invalid_wind_speed coordinates: gt3r_delta_time gt3r_lat_ph gt3r_lon_ph |
| gt3r_lat_ph: | Array of 64 bit Reals [ = 0..29322] contentType: modelResult description: Latitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. long_name: Latitude source: ATL03 units: degrees_north standard_name: latitude valid_max: 90.000000000000000 valid_min: -90.000000000000000 origname: lat_ph fullnamepath: /gt3r/lat_ph coordinates: gt3r_delta_time gt3r_lon_ph |
| gt3r_lon_ph: | Array of 64 bit Reals [ = 0..29322] contentType: modelResult description: Longitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. long_name: Longitude source: ATL03 units: degrees_east standard_name: longitude valid_max: 180.00000000000000 valid_min: -180.00000000000000 origname: lon_ph fullnamepath: /gt3r/lon_ph coordinates: gt3r_delta_time gt3r_lat_ph |
| gt3r_low_confidence_flag: | Array of Bytes [ = 0..29322] contentType: modelResult source: ATL03 description: There is low confidence that the photon classified as bathymetry is actually bathymetry long_name: Low confidence bathymetry flag units: boolean flag_meanings: false, true flag_values: 0, 1 origname: low_confidence_flag fullnamepath: /gt3r/low_confidence_flag coordinates: gt3r_delta_time gt3r_lat_ph gt3r_lon_ph |
| gt3r_night_flag: | Array of Bytes [ = 0..29322] contentType: modelResult description: The solar elevation was less than 5 degrees at the time and location of the photon long_name: Night flag source: ATL03 units: boolean flag_meanings: false, true flag_values: 0, 1 origname: night_flag fullnamepath: /gt3r/night_flag coordinates: gt3r_delta_time gt3r_lat_ph gt3r_lon_ph |
| gt3r_ortho_h: | Array of 32 bit Reals [ = 0..29322] contentType: physicalMeasurement description: Height of each received photon, relative to the geoid. long_name: Orthometric height source: ATL03 units: meters origname: ortho_h fullnamepath: /gt3r/ortho_h coordinates: gt3r_delta_time gt3r_lat_ph gt3r_lon_ph |
| gt3r_sensor_depth_exceeded: | Array of Bytes [ = 0..29322] contentType: modelResult description: The subaqueous photon is below the maximum depth detectable by the ATLAS sensor given the Kd of the water column long_name: Sensor depth exceeded source: ATL03 units: boolean flag_meanings: false, true flag_values: 0, 1 origname: sensor_depth_exceeded fullnamepath: /gt3r/sensor_depth_exceeded coordinates: gt3r_delta_time gt3r_lat_ph gt3r_lon_ph |
| gt3r_sigma_thu: | Array of 32 bit Reals [ = 0..29322] contentType: physicalMeasurement description: The combination of the aerial and subaqueous horizontal uncertainty for each received photon long_name: Total horizontal uncertainty source: ATL03 units: meters origname: sigma_thu fullnamepath: /gt3r/sigma_thu coordinates: gt3r_delta_time gt3r_lat_ph gt3r_lon_ph |
| gt3r_sigma_tvu: | Array of 32 bit Reals [ = 0..29322] contentType: modelResult description: The combination of the aerial and subaqueous vertical uncertainty for each received photon long_name: Total vertical uncertainty source: ATL03 units: meters origname: sigma_tvu fullnamepath: /gt3r/sigma_tvu coordinates: gt3r_delta_time gt3r_lat_ph gt3r_lon_ph |
| gt3r_surface_h: | Array of 32 bit Reals [ = 0..29322] contentType: modelResult description: The geoid corrected height of the sea surface at the detected photon long_name: Sea surface orthometric height source: ATL03 units: meters origname: surface_h fullnamepath: /gt3r/surface_h coordinates: gt3r_delta_time gt3r_lat_ph gt3r_lon_ph |
| gt3r_x_atc: | Array of 64 bit Reals [ = 0..29322] contentType: modelResult description: Along-track distance in a segment projected to the ellipsoid of the received photon, based on the Along-Track Segment algorithm. Total along track distance can be found by adding this value to the sum of segment lengths measured from the start of the most recent reference groundtrack. long_name: Distance from equator crossing source: ATL03 units: meters origname: x_atc fullnamepath: /gt3r/x_atc coordinates: gt3r_delta_time gt3r_lat_ph gt3r_lon_ph |
| gt3r_y_atc: | Array of 32 bit Reals [ = 0..29322] contentType: modelResult description: Across-track distance projected to the ellipsoid of the received photon from the reference ground track. This is based on the Along-Track Segment algorithm described in Section 3.1 of the ATBD. long_name: Distance off RGT source: ATL03 units: meters origname: y_atc fullnamepath: /gt3r/y_atc coordinates: gt3r_delta_time gt3r_lat_ph gt3r_lon_ph |
| metadata_atl24: | String contentType: auxiliaryInformation description: atl24 algorithm versioning and build information long_name: ATL24 MetaData source: Derived units: json origname: atl24 fullnamepath: /metadata/atl24 |
| metadata_extent: | String contentType: auxiliaryInformation description: geospatial and temporal extents long_name: Query MetaData source: Derived units: json origname: extent fullnamepath: /metadata/extent |
| metadata_sliderule: | String contentType: auxiliaryInformation source: Derived description: sliderule server and request information long_name: SlideRule MetaData units: json origname: sliderule fullnamepath: /metadata/sliderule |
| orbit_info_crossing_time: | 64 bit Real contentType: referenceInformation source: POD/PPD description: The time, in seconds since the ATLAS SDP GPS Epoch, at which the ascending node crosses the equator. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name: Ascending Node Crossing Time units: seconds since 2018-01-01 standard_name: time origname: crossing_time fullnamepath: /orbit_info/crossing_time |
| orbit_info_cycle_number: | Byte contentType: referenceInformation description: Tracks the number of 91-day cycles in the mission, beginning with 01. A unique orbit number can be determined by subtracting 1 from the cycle_number, multiplying by 1387 and adding the rgt value. long_name: Cycle Number source: POD/PPD units: counts origname: cycle_number fullnamepath: /orbit_info/cycle_number |
| orbit_info_lan: | 64 bit Real contentType: referenceInformation description: Longitude at the ascending node crossing. long_name: Ascending Node Longitude source: POD/PPD units: degrees_east origname: lan fullnamepath: /orbit_info/lan |
| orbit_info_orbit_number: | 16 bit Integer contentType: referenceInformation description: Unique identifying number for each planned ICESat-2 orbit. long_name: Orbit Number source: Operations units: 1 origname: orbit_number fullnamepath: /orbit_info/orbit_number |
| orbit_info_rgt: | 16 bit Unsigned integer contentType: referenceInformation description: The reference ground track (RGT) is the track on the earth at which a specified unit vector within the observatory is pointed. Under nominal operating conditions, there will be no data collected along the RGT, as the RGT is spanned by GT2L and GT2R. During slews or off-pointing, it is possible that ground tracks may intersect the RGT. The ICESat-2 mission has 1387 RGTs. long_name: Reference Ground Track source: POD/PPD units: counts origname: rgt fullnamepath: /orbit_info/rgt |
| orbit_info_sc_orient: | 16 bit Integer contentType: referenceInformation description: This parameter tracks the spacecraft orientation between forward, backward and transitional flight modes. ICESat-2 is considered to be flying forward when the weak beams are leading the strong beams; and backward when the strong beams are leading the weak beams. ICESat-2 is considered to be in transition while it is maneuvering between the two orientations. Science quality is potentially degraded while in transition mode. long_name: Spacecraft Orientation source: POD/PPD units: 1 flag_meanings: backward forward transition flag_values: 0, 1, 2 origname: sc_orient fullnamepath: /orbit_info/sc_orient |
| orbit_info_sc_orient_time: | 64 bit Real contentType: referenceInformation source: POD/PPD description: The time of the last spacecraft orientation change between forward, backward and transitional flight modes, expressed in seconds since the ATLAS SDP GPS Epoch. ICESat-2 is considered to be flying forward when the weak beams are leading the strong beams; and backward when the strong beams are leading the weak beams. ICESat-2 is considered to be in transition while it is maneuvering between the two orientations. Science quality is potentially degraded while in transition mode. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name: Time of Last Spacecraft Orientation Change units: seconds since 2018-01-01 standard_name: time origname: sc_orient_time fullnamepath: /orbit_info/sc_orient_time |