| short_name: | ATL11 |
| Conventions: | CF-1.6 |
| contributor_name: | Thomas A Neumann (thomas.neumann@nasa.gov), Thorsten Markus (thorsten.markus@nasa.gov), Suneel Bhardwaj (suneel.bhardwaj@nasa.gov) David W Hancock III (david.w.hancock@nasa.gov) |
| date_created: | 2025-09-22T17:29:20.169101Z |
| contributor_role: | Instrument Engineer, Investigator, Principle Investigator, Data Producer, Data Producer |
| date_type: | UTC |
| featureType: | trajectory |
| geospatial_lat_max: | -78.994011517244402 |
| geospatial_lat_min: | -88.037139860977035 |
| geospatial_lat_units: | degrees_north |
| geospatial_lon_max: | 157.91700093027168 |
| geospatial_lon_min: | -3.1996215593138118 |
| geospatial_lon_units: | degrees_east |
| granule_type: | ATL11 |
| hdfversion: | HDF5 1.14.4 |
| history: | 2025-09-22T17:29:20.171089Z |
| identifier_file_uuid: | d21ba820-2fe0-32f9-876d-e345fd646ef0 |
| identifier_product_doi_authority: | http://dx.doi.org |
| identifier_product_format_version: | 3.0 |
| level: | L3B |
| 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_coverage_start: | 2019-03-29T08:39:11.000000Z |
| time_type: | CCSDS UTC-A |
| time_coverage_duration: | 191254180.57086730 |
| time_coverage_end: | 2025-04-19T22:48:44.000000Z |
| publisher_email: | nsidc@nsidc.org |
| publisher_url: | http://nsidc.org/daac/ |
| identifier_product_type: | ATL11 |
| title: | ATLAS/ICESat-2 L3B Slope-Corrected Land Ice Height Time Series |
| platform: | ICESat-2 > Ice, Cloud, and land Elevation Satellite-2 |
| publisher_name: | NSIDC DAAC > NASA National Snow and Ice Data Center Distributed Active Archive Center |
| identifier_product_doi: | doi:10.5067/ATLAS/ATL11.007 |
| institution: | National Aeronautics and Space Administration (NASA) |
| creator_name: | GSFC I-SIPS > ICESat-2 Science Investigator-led Processing System |
| description: | This data set provides time series of land-ice surface heights derived from the ICESat-2 ATL06 Land Ice Height product. It is a spatially organized product that allows easy access to height-change information derived from ICESat-2 observations. |
| summary: | The purpose of ATL11 is to provide an ICESat-2 satellite cycle summary of heights and height changes of land-based ice and will be provided as input to ATL14 and ATL15, gridded estimates of heights and height-changes. |
| 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: | 3B |
| references: | http://nsidc.org/data/icesat2/data.html |
| source: | Spacecraft |
| project: | ICESat-2 > Ice, Cloud, and land Elevation Satellite-2 |
| instrument: | ATLAS > Advanced Topographic Laser Altimeter System |
| METADATA_iso_19139_dataset_xml: | Array of Strings [FakeDim0 = 0..0] long_name: ISO 19139 Dataset XML description: ISO 19139 Dataset XML origname: iso_19139_dataset_xml fullnamepath: /METADATA/iso_19139_dataset_xml |
| METADATA_iso_19139_series_xml: | Array of Strings [FakeDim0 = 0..0] long_name: ISO 19139 Series XML description: ISO 19139 Series XML origname: iso_19139_series_xml fullnamepath: /METADATA/iso_19139_series_xml |
| ancillary_data_release: | Array of Strings [FakeDim0 = 0..0] long_name: Release Number units: 1 source: Operations contentType: auxiliaryInformation description: Release number of the granule. The release number is incremented when the software or ancillary data used to create the granule has been changed. origname: release fullnamepath: /ancillary_data/release |
| ancillary_data_end_geoseg: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Ending Geolocation Segment units: 1 source: Derived contentType: auxiliaryInformation description: The ending geolocation segment number associated with the data contained within this granule. ICESat granule geographic regions are further refined by geolocation segments. During the geolocation process, a geolocation segment is created approximately every 20m from the start of the orbit to the end. The geolocation segments help align the ATLAS strong a weak beams and provide a common segment length for the L2 and higher products. The geolocation segment indices differ slightly from orbit-to-orbit because of the irregular shape of the Earth. The geolocation segment indices on ATL01 and ATL02 are only approximate because beams have not been aligned at the time of their creation. origname: end_geoseg fullnamepath: /ancillary_data/end_geoseg |
| ancillary_data_version: | Array of Strings [FakeDim0 = 0..0] long_name: Version units: 1 source: Operations contentType: auxiliaryInformation description: Version number of this granule within the release. It is a sequential number corresponding to the number of times the granule has been reprocessed for the current release. origname: version fullnamepath: /ancillary_data/version |
| ancillary_data_end_region: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Ending Region units: 1 source: Derived contentType: auxiliaryInformation description: The ending product-specific region number associated with the data contained within this granule. ICESat-2 data products are separated by geographic regions. The data contained within a specific region are the same for ATL01 and ATL02. ATL03 regions differ slightly because of different geolocation segment locations caused by the irregular shape of the Earth. The region indices for other products are completely independent. origname: end_region fullnamepath: /ancillary_data/end_region |
| ancillary_data_atlas_sdp_gps_epoch: | Array of 64 bit Reals [FakeDim0 = 0..0] long_name: ATLAS Epoch Offset units: seconds since 1980-01-06T00:00:00.000000Z source: Operations contentType: auxiliaryInformation description: Number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS Standard Data Product (SDP) epoch (2018-01-01:T00.00.00.000000 UTC). Add this value to delta time parameters to compute full gps_seconds (relative to the GPS epoch) for each data point. origname: atlas_sdp_gps_epoch fullnamepath: /ancillary_data/atlas_sdp_gps_epoch |
| ancillary_data_end_rgt: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Ending Reference Groundtrack units: 1 source: Derived valid_min: 1 valid_max: 1387 contentType: auxiliaryInformation description: The ending reference groundtrack (RGT) number associated with the data contained within this granule. There are 1387 reference groundtrack in the ICESat-2 repeat orbit. The reference groundtrack increments each time the spacecraft completes a full orbit of the Earth and resets to 1 each time the spacecraft completes a full cycle. origname: end_rgt fullnamepath: /ancillary_data/end_rgt |
| ancillary_data_end_delta_time: | Array of 64 bit Reals [FakeDim0 = 0..0] long_name: ATLAS End Time (Actual) standard_name: time units: seconds since 2018-01-01 source: Derived contentType: auxiliaryInformation description: Number of GPS seconds since the ATLAS SDP epoch at the last data point in the file. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. origname: end_delta_time fullnamepath: /ancillary_data/end_delta_time |
| ancillary_data_end_orbit: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Ending Orbit Number units: 1 source: Derived contentType: auxiliaryInformation description: The ending orbit number associated with the data contained within this granule. The orbit number increments each time the spacecraft completes a full orbit of the Earth. origname: end_orbit fullnamepath: /ancillary_data/end_orbit |
| ancillary_data_start_cycle: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Starting Cycle units: 1 source: Derived valid_min: 0 valid_max: 99 contentType: auxiliaryInformation description: The starting cycle number associated with the data contained within this granule. The cycle number is the counter of the number of 91-day repeat cycles completed by the mission. origname: start_cycle fullnamepath: /ancillary_data/start_cycle |
| ancillary_data_data_end_utc: | Array of Strings [FakeDim0 = 0..0] long_name: End UTC Time of Granule (CCSDS-A, Actual) units: 1 source: Derived contentType: auxiliaryInformation description: UTC (in CCSDS-A format) of the last data point within the granule. origname: data_end_utc fullnamepath: /ancillary_data/data_end_utc |
| ancillary_data_control: | Array of Strings [FakeDim0 = 0..0] long_name: Control File units: 1 source: Operations contentType: auxiliaryInformation description: PGE-specific control file used to generate this granule. To re-use, replace breaks (BR) with linefeeds. origname: control fullnamepath: /ancillary_data/control |
| ancillary_data_start_gpssow: | Array of 64 bit Reals [FakeDim0 = 0..0] long_name: Start GPS SOW of Granule (Actual) units: seconds source: Derived contentType: auxiliaryInformation description: GPS seconds-of-week of the first data point in the granule. origname: start_gpssow fullnamepath: /ancillary_data/start_gpssow |
| ancillary_data_granule_end_utc: | Array of Strings [FakeDim0 = 0..0] long_name: End UTC Time of Granule (CCSDS-A, Requested) units: 1 source: Derived contentType: auxiliaryInformation description: Requested end time (in UTC CCSDS-A) of this granule. origname: granule_end_utc fullnamepath: /ancillary_data/granule_end_utc |
| ancillary_data_end_cycle: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Ending Cycle units: 1 source: Derived valid_min: 0 valid_max: 99 contentType: auxiliaryInformation description: The ending cycle number associated with the data contained within this granule. The cycle number is the counter of the number of 91-day repeat cycles completed by the mission. origname: end_cycle fullnamepath: /ancillary_data/end_cycle |
| ancillary_data_granule_start_utc: | Array of Strings [FakeDim0 = 0..0] long_name: Start UTC Time of Granule (CCSDS-A, Requested) units: 1 source: Derived contentType: auxiliaryInformation description: Requested start time (in UTC CCSDS-A) of this granule. origname: granule_start_utc fullnamepath: /ancillary_data/granule_start_utc |
| ancillary_data_start_delta_time: | Array of 64 bit Reals [FakeDim0 = 0..0] long_name: ATLAS Start Time (Actual) standard_name: time units: seconds since 2018-01-01 source: Derived contentType: auxiliaryInformation description: Number of GPS seconds since the ATLAS SDP epoch at the first data point in the file. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. origname: start_delta_time fullnamepath: /ancillary_data/start_delta_time |
| ancillary_data_start_geoseg: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Starting Geolocation Segment units: 1 source: Derived contentType: auxiliaryInformation description: The starting geolocation segment number associated with the data contained within this granule. ICESat granule geographic regions are further refined by geolocation segments. During the geolocation process, a geolocation segment is created approximately every 20m from the start of the orbit to the end. The geolocation segments help align the ATLAS strong a weak beams and provide a common segment length for the L2 and higher products. The geolocation segment indices differ slightly from orbit-to-orbit because of the irregular shape of the Earth. The geolocation segment indices on ATL01 and ATL02 are only approximate because beams have not been aligned at the time of their creation. origname: start_geoseg fullnamepath: /ancillary_data/start_geoseg |
| ancillary_data_start_orbit: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Starting Orbit Number units: 1 source: Derived contentType: auxiliaryInformation description: The starting orbit number associated with the data contained within this granule. The orbit number increments each time the spacecraft completes a full orbit of the Earth. origname: start_orbit fullnamepath: /ancillary_data/start_orbit |
| ancillary_data_data_start_utc: | Array of Strings [FakeDim0 = 0..0] long_name: Start UTC Time of Granule (CCSDS-A, Actual) units: 1 source: Derived contentType: auxiliaryInformation description: UTC (in CCSDS-A format) of the first data point within the granule. origname: data_start_utc fullnamepath: /ancillary_data/data_start_utc |
| ancillary_data_end_gpsweek: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Ending GPSWeek of Granule (Actual) contentType: auxiliaryInformation description: GPS week number of the last data point in the granule. units: weeks from 1980-01-06 source: Derived origname: end_gpsweek fullnamepath: /ancillary_data/end_gpsweek |
| ancillary_data_start_rgt: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Starting Reference Groundtrack units: 1 source: Derived valid_min: 1 valid_max: 1387 contentType: auxiliaryInformation description: The starting reference groundtrack (RGT) number associated with the data contained within this granule. There are 1387 reference groundtrack in the ICESat-2 repeat orbit. The reference groundtrack increments each time the spacecraft completes a full orbit of the Earth and resets to 1 each time the spacecraft completes a full cycle. origname: start_rgt fullnamepath: /ancillary_data/start_rgt |
| ancillary_data_end_gpssow: | Array of 64 bit Reals [FakeDim0 = 0..0] long_name: Ending GPS SOW of Granule (Actual) units: seconds source: Derived contentType: auxiliaryInformation description: GPS seconds-of-week of the last data point in the granule. origname: end_gpssow fullnamepath: /ancillary_data/end_gpssow |
| ancillary_data_qa_at_interval: | Array of 64 bit Reals [FakeDim0 = 0..0] long_name: QA Along-Track Interval units: seconds/cell source: control contentType: auxiliaryInformation description: Statistics time interval for along-track QA data. origname: qa_at_interval fullnamepath: /ancillary_data/qa_at_interval |
| ancillary_data_start_region: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Starting Region units: 1 source: Derived contentType: auxiliaryInformation description: The starting product-specific region number associated with the data contained within this granule. ICESat-2 data products are separated by geographic regions. The data contained within a specific region are the same for ATL01 and ATL02. ATL03 regions differ slightly because of different geolocation segment locations caused by the irregular shape of the Earth. The region indices for other products are completely independent. origname: start_region fullnamepath: /ancillary_data/start_region |
| ancillary_data_start_gpsweek: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Start GPSWeek of Granule (Actual) units: weeks from 1980-01-06 source: Derived contentType: auxiliaryInformation description: GPS week number of the first data point in the granule. origname: start_gpsweek fullnamepath: /ancillary_data/start_gpsweek |
| orbit_info_bounding_polygon_lat1: | Array of 32 bit Reals [orbit_info_bounding_polygon_dim1 = 0..26] description: Polygon extent vertex latitude units: degrees North long_name: Polygon vertex latitude source: model origname: bounding_polygon_lat1 fullnamepath: /orbit_info/bounding_polygon_lat1 coordinates: orbit_info_bounding_polygon_dim1 |
| orbit_info_bounding_polygon_lon1: | Array of 32 bit Reals [orbit_info_bounding_polygon_dim1 = 0..26] description: Polygon extent vertex longitude units: degrees East long_name: Polygon vertex longitude source: model origname: bounding_polygon_lon1 fullnamepath: /orbit_info/bounding_polygon_lon1 coordinates: orbit_info_bounding_polygon_dim1 |
| pt1_cycle_stats_atl06_summary_zero_count: | Array of 16 bit Integers [pt1_ref_pt = 0..40569][pt1_cycle_number = 0..25] description: Number of segments with ATL06_quality_summary==0 (0 indicates the best-quality data) long_name: ATL06 best quality count source: ATL06 DIMENSION_LABELS: ref_pt, cycle_number units: counts valid_min: 0 origname: atl06_summary_zero_count fullnamepath: /pt1/cycle_stats/atl06_summary_zero_count coordinates: pt1_delta_time pt1_latitude pt1_longitude pt1_cycle_number |
| pt1_cycle_stats_bsnow_conf: | Array of 16 bit Integers [pt1_ref_pt = 0..40569][pt1_cycle_number = 0..25] description: Maximum bsnow_conf flag from ATL06: indicates the greatest (among segments) confidence flag for presence of blowing snow for each cycle long_name: maxmimum blowing snow confidence flag source: ATL06 valid_min: -5 DIMENSION_LABELS: ref_pt, cycle_number units: 1 valid_max: 6 origname: bsnow_conf fullnamepath: /pt1/cycle_stats/bsnow_conf coordinates: pt1_delta_time pt1_latitude pt1_longitude pt1_cycle_number |
| pt1_cycle_stats_bsnow_h: | Array of 32 bit Reals [pt1_ref_pt = 0..40569][pt1_cycle_number = 0..25] units: meters description: Weighted-average blowing snow layer height for each cycle DIMENSION_LABELS: ref_pt, cycle_number long_name: weighted average blowing snow height source: ATL06 _FillValue: 3.402823466e+38 origname: bsnow_h fullnamepath: /pt1/cycle_stats/bsnow_h coordinates: pt1_delta_time pt1_latitude pt1_longitude pt1_cycle_number |
| pt1_cycle_stats_cloud_flg_asr: | Array of 16 bit Integers [pt1_ref_pt = 0..40569][pt1_cycle_number = 0..25] description: Minimum apparent-surface-reflectance -based cloud flag from ATL06: Flag indicates confidence that clouds with OT > 0.2 are present in the lower 3 km of the atmosphere based on ATL09 long_name: Minimum apparent surface reflectance flag source: ATL06 DIMENSION_LABELS: ref_pt, cycle_number units: 1 valid_min: 0 valid_max: 5 origname: cloud_flg_asr fullnamepath: /pt1/cycle_stats/cloud_flg_asr coordinates: pt1_delta_time pt1_latitude pt1_longitude pt1_cycle_number |
| pt1_cycle_stats_cloud_flg_atm: | Array of 16 bit Integers [pt1_ref_pt = 0..40569][pt1_cycle_number = 0..25] description: Minimum cloud flag from ATL06: Flag indicates confidence that clouds with OT > 0.2 are present in the lower 3 km of the atmosphere based on ATL09 long_name: minimum cloud flag source: ATL06 DIMENSION_LABELS: ref_pt, cycle_number units: 1 valid_min: 0 valid_max: 10 origname: cloud_flg_atm fullnamepath: /pt1/cycle_stats/cloud_flg_atm coordinates: pt1_delta_time pt1_latitude pt1_longitude pt1_cycle_number |
| pt1_cycle_stats_dac: | Array of 32 bit Reals [pt1_ref_pt = 0..40569][pt1_cycle_number = 0..25] units: meters description: Weighted-average dynamic atmosphere correction for each pass DIMENSION_LABELS: ref_pt, cycle_number long_name: weighted average dynamic atmosphere correction source: ATL06 valid_min: -50.00000000 valid_max: 50.00000000 _FillValue: 3.402823466e+38 origname: dac fullnamepath: /pt1/cycle_stats/dac coordinates: pt1_delta_time pt1_latitude pt1_longitude pt1_cycle_number |
| pt1_cycle_stats_dh_geoloc: | Array of 32 bit Reals [pt1_ref_pt = 0..40569][pt1_cycle_number = 0..25] units: meters description: Height correction to correct for Antarctic geolocation bias DIMENSION_LABELS: ref_pt, cycle_number long_name: geolocation height bias source: derived, ATL11 algorithm _FillValue: 3.402823466e+38 origname: dh_geoloc fullnamepath: /pt1/cycle_stats/dh_geoloc coordinates: pt1_delta_time pt1_latitude pt1_longitude pt1_cycle_number |
| pt1_cycle_stats_h_mean: | Array of 32 bit Reals [pt1_ref_pt = 0..40569][pt1_cycle_number = 0..25] description: Weighted-average of surface heights, not including the correction for the reference surface units: meters DIMENSION_LABELS: ref_pt, cycle_number long_name: weighted average uncorrected surface heights source: ATL06 valid_min: -460.0000000 valid_max: 8400.000000 _FillValue: 3.402823466e+38 origname: h_mean fullnamepath: /pt1/cycle_stats/h_mean coordinates: pt1_delta_time pt1_latitude pt1_longitude pt1_cycle_number |
| pt1_cycle_stats_h_rms_misfit: | Array of 32 bit Reals [pt1_ref_pt = 0..40569][pt1_cycle_number = 0..25] units: meters long_name: weighted average RMS fit error DIMENSION_LABELS: ref_pt, cycle_number description: Weighted-average RMS misfit between PE heights and along-track land-ice segment fit source: derived, ATL11 algorithm valid_min: 0.000000000 _FillValue: 3.402823466e+38 origname: h_rms_misfit fullnamepath: /pt1/cycle_stats/h_rms_misfit coordinates: pt1_delta_time pt1_latitude pt1_longitude pt1_cycle_number |
| pt1_cycle_stats_min_signal_selection_source: | Array of 16 bit Integers [pt1_ref_pt = 0..40569][pt1_cycle_number = 0..25] long_name: minimum signal selection source valid_min: 0 valid_max: 4 units: 1 DIMENSION_LABELS: ref_pt, cycle_number description: Minimum of the ATL06 signal_selection_source value (indicates the highest-quality segment in the cycle) source: ATL06 origname: min_signal_selection_source fullnamepath: /pt1/cycle_stats/min_signal_selection_source coordinates: pt1_delta_time pt1_latitude pt1_longitude pt1_cycle_number |
| pt1_cycle_stats_min_snr_significance: | Array of 32 bit Reals [pt1_ref_pt = 0..40569][pt1_cycle_number = 0..25] units: 1 long_name: minumum signal-noise ration significance DIMENSION_LABELS: ref_pt, cycle_number description: Minimum of SNR_significance (indicates the quality of the best segment in the cycle) source: ATL06 valid_min: 0.000000000 valid_max: 1.000000000 _FillValue: 3.402823466e+38 origname: min_snr_significance fullnamepath: /pt1/cycle_stats/min_snr_significance coordinates: pt1_delta_time pt1_latitude pt1_longitude pt1_cycle_number |
| pt1_cycle_stats_r_eff: | Array of 32 bit Reals [pt1_ref_pt = 0..40569][pt1_cycle_number = 0..25] units: 1 description: Weighted-average effective, uncorrected reflectance for each pass. DIMENSION_LABELS: ref_pt, cycle_number long_name: weighted average reflectance source: derived, ATL11 algorithm valid_min: 0.000000000 valid_max: 10.00000000 _FillValue: 3.402823466e+38 origname: r_eff fullnamepath: /pt1/cycle_stats/r_eff coordinates: pt1_delta_time pt1_latitude pt1_longitude pt1_cycle_number |
| pt1_cycle_stats_seg_count: | Array of 32 bit Integers [pt1_ref_pt = 0..40569][pt1_cycle_number = 0..25] description: Number of segments marked as valid for each cycle. Equal to 0 for those cycles not included in the reference-surface shape fit. long_name: number valid segments source: ATL06 valid_min: 0 valid_max: 14 DIMENSION_LABELS: ref_pt, cycle_number units: counts origname: seg_count fullnamepath: /pt1/cycle_stats/seg_count coordinates: pt1_delta_time pt1_latitude pt1_longitude pt1_cycle_number |
| pt1_cycle_stats_sigma_geo_at: | Array of 32 bit Reals [pt1_ref_pt = 0..40569][pt1_cycle_number = 0..25] DIMENSION_LABELS: ref_pt, cycle_number units: meters description: Root-mean-weighted-square-average local-coordinate x horizontal geolocation error for each cycle due to PPD and POD source: ATL06 long_name: average horizontal x-coordinate geolocation error valid_min: 0.000000000 _FillValue: 3.402823466e+38 origname: sigma_geo_at fullnamepath: /pt1/cycle_stats/sigma_geo_at coordinates: pt1_delta_time pt1_latitude pt1_longitude pt1_cycle_number |
| pt1_cycle_stats_sigma_geo_h: | Array of 32 bit Reals [pt1_ref_pt = 0..40569][pt1_cycle_number = 0..25] DIMENSION_LABELS: ref_pt, cycle_number units: meters description: Root-mean-weighted-square-average total vertical geolocation error due to PPD and POD long_name: average vertical geolocation error source: ATL06 valid_min: 0.000000000 _FillValue: 3.402823466e+38 origname: sigma_geo_h fullnamepath: /pt1/cycle_stats/sigma_geo_h coordinates: pt1_delta_time pt1_latitude pt1_longitude pt1_cycle_number |
| pt1_cycle_stats_sigma_geo_xt: | Array of 32 bit Reals [pt1_ref_pt = 0..40569][pt1_cycle_number = 0..25] units: meters DIMENSION_LABELS: ref_pt, cycle_number description: Root-mean-weighted-square-average local-coordinate y horizontal geolocation error for each cycle due to PPD and POD long_name: average horizontal y-coordinate geolocation error source: ATL06 valid_min: 0.000000000 _FillValue: 3.402823466e+38 origname: sigma_geo_xt fullnamepath: /pt1/cycle_stats/sigma_geo_xt coordinates: pt1_delta_time pt1_latitude pt1_longitude pt1_cycle_number |
| pt1_cycle_stats_tide_ocean: | Array of 32 bit Reals [pt1_ref_pt = 0..40569][pt1_cycle_number = 0..25] units: meters DIMENSION_LABELS: ref_pt, cycle_number description: Weighted-average ocean tide for each pass long_name: weighted average ocean tide source: ATL06 valid_min: -50.00000000 valid_max: 50.00000000 _FillValue: 3.402823466e+38 origname: tide_ocean fullnamepath: /pt1/cycle_stats/tide_ocean coordinates: pt1_delta_time pt1_latitude pt1_longitude pt1_cycle_number |
| pt1_cycle_stats_x_atc: | Array of 64 bit Reals [pt1_ref_pt = 0..40569][pt1_cycle_number = 0..25] units: meters description: weighted average of pair-center RGT x coordinates for each cycle long_name: weighted average rgt x-coordinates source: ATL06 valid_min: 0.0000000000000000 DIMENSION_LABELS: ref_pt, cycle_number valid_max: 40200000.000000000 _FillValue: 1.7976931348623157e+308 origname: x_atc fullnamepath: /pt1/cycle_stats/x_atc coordinates: pt1_delta_time pt1_latitude pt1_longitude pt1_cycle_number |
| pt1_cycle_stats_y_atc: | Array of 64 bit Reals [pt1_ref_pt = 0..40569][pt1_cycle_number = 0..25] units: meters description: weighted mean of pair-center RGT y coordinates for each cycle long_name: weighted average rgt y-coordinates source: ATL06 valid_min: -30000.000000000000 valid_max: 30000.000000000000 DIMENSION_LABELS: ref_pt, cycle_number _FillValue: 1.7976931348623157e+308 origname: y_atc fullnamepath: /pt1/cycle_stats/y_atc coordinates: pt1_delta_time pt1_latitude pt1_longitude pt1_cycle_number |
| pt1_delta_time: | Array of 64 bit Reals [pt1_ref_pt = 0..40569][pt1_cycle_number = 0..25] description: Mean number of GPS seconds since the ATLAS SDP epoch long_name: Elapsed GPS seconds source: ATL06 valid_min: 0.0000000000000000 _FillValue: 1.7976931348623157e+308 DIMENSION_LABELS: ref_pt, cycle_number units: seconds since 2018-01-01 origname: delta_time fullnamepath: /pt1/delta_time coordinates: pt1_latitude pt1_longitude |
| pt1_h_corr: | Array of 32 bit Reals [pt1_ref_pt = 0..40569][pt1_cycle_number = 0..25] DIMENSION_LABELS: ref_pt, cycle_number units: meters description: the mean corrected height long_name: mean corrected height source: derived, ATL11 algorithm valid_min: -460.0000000 valid_max: 8400.000000 _FillValue: 3.402823466e+38 origname: h_corr fullnamepath: /pt1/h_corr coordinates: pt1_delta_time pt1_latitude pt1_longitude |
| pt1_h_corr_sigma: | Array of 32 bit Reals [pt1_ref_pt = 0..40569][pt1_cycle_number = 0..25] source: derived, ATL11 algorithm valid_min: 0.000000000 valid_max: 15.00000000 _FillValue: 3.402823466e+38 DIMENSION_LABELS: ref_pt, cycle_number units: meters description: the formal error in the corrected height long_name: mean corrected height error origname: h_corr_sigma fullnamepath: /pt1/h_corr_sigma coordinates: pt1_delta_time pt1_latitude pt1_longitude pt1_cycle_number |
| pt1_h_corr_sigma_systematic: | Array of 32 bit Reals [pt1_ref_pt = 0..40569][pt1_cycle_number = 0..25] description: the magnitude of all errors that might be correlated at scales larger than a single fit center (e.g. pointing errors, GPS errors, etc) valid_min: 0.000000000 _FillValue: 3.402823466e+38 DIMENSION_LABELS: ref_pt, cycle_number units: meters long_name: corrected height error source: derived, ATL11 algorithm origname: h_corr_sigma_systematic fullnamepath: /pt1/h_corr_sigma_systematic coordinates: pt1_delta_time pt1_latitude pt1_longitude pt1_cycle_number |
| pt1_latitude: | Array of 64 bit Reals [pt1_ref_pt = 0..40569] DIMENSION_LABELS: ref_pt units: degrees North description: center latitude based on selected segments long_name: latitude source: ATL06 segments valid_min: -90.000000000000000 valid_max: 90.000000000000000 _FillValue: 1.7976931348623157e+308 origname: latitude fullnamepath: /pt1/latitude coordinates: pt1_delta_time pt1_longitude |
| pt1_longitude: | Array of 64 bit Reals [pt1_ref_pt = 0..40569] DIMENSION_LABELS: ref_pt units: degrees East description: center longitude based on selected segments long_name: longitude source: ATL06 segments valid_min: -180.00000000000000 valid_max: 180.00000000000000 _FillValue: 1.7976931348623157e+308 origname: longitude fullnamepath: /pt1/longitude coordinates: pt1_delta_time pt1_latitude |
| pt1_quality_summary: | Array of 16 bit Integers [pt1_ref_pt = 0..40569][pt1_cycle_number = 0..25] units: 1 description: Summary flag: zero indicates high-quality cycles: where min_signal_selection_source <=1 and min_SNR_significance < 0.02, and ATL06_summary_zero_count >0. long_name: quality summary source: derived, ATL11 algorithm valid_min: 0 valid_max: 1 DIMENSION_LABELS: ref_pt, cycle_number origname: quality_summary fullnamepath: /pt1/quality_summary coordinates: pt1_delta_time pt1_latitude pt1_longitude pt1_cycle_number |
| pt1_ref_surf_at_slope: | Array of 32 bit Reals [pt1_ref_pt = 0..40569] DIMENSION_LABELS: ref_pt units: 1 description: Mean along-track component of the slope of the reference surface within 50 m of the fit center long_name: along-track slope source: derived, ATL11 algorithm _FillValue: 3.402823466e+38 origname: at_slope fullnamepath: /pt1/ref_surf/at_slope coordinates: pt1_delta_time pt1_latitude pt1_longitude |
| pt1_ref_surf_complex_surface_flag: | Array of 16 bit Integers [pt1_ref_pt = 0..40569] DIMENSION_LABELS: ref_pt units: 1 long_name: complex surface flag description: 0 indicates that normal fitting was attempted, 1 indicates that the signal selection algorithm rejected too many repeats, and only a linear fit was attempted source: derived, ATL11 algorithm valid_min: 0 valid_max: 1 origname: complex_surface_flag fullnamepath: /pt1/ref_surf/complex_surface_flag coordinates: pt1_delta_time pt1_latitude pt1_longitude |
| pt1_ref_surf_curvature: | Array of 32 bit Reals [pt1_ref_pt = 0..40569] DIMENSION_LABELS: ref_pt units: 1 description: the RMS of the slope of the fit polynomial within 50 m of the fit center long_name: curvature source: derived, ATL11 algorithm valid_min: 0.000000000 _FillValue: 3.402823466e+38 origname: curvature fullnamepath: /pt1/ref_surf/curvature coordinates: pt1_delta_time pt1_latitude pt1_longitude |
| pt1_ref_surf_deg_x: | Array of 16 bit Integers [pt1_ref_pt = 0..40569] DIMENSION_LABELS: ref_pt units: counts description: Maximum degree of non-zero polynomial components in x long_name: max-degree x polynomial source: derived, ATL11 algorithm valid_min: 0 valid_max: 3 origname: deg_x fullnamepath: /pt1/ref_surf/deg_x coordinates: pt1_delta_time pt1_latitude pt1_longitude |
| pt1_ref_surf_deg_y: | Array of 16 bit Integers [pt1_ref_pt = 0..40569] DIMENSION_LABELS: ref_pt units: counts description: Maximum degree of non-zero polynomial components in y long_name: max-degree y polynomial source: derived, ATL11 algorithm valid_min: 0 valid_max: 3 origname: deg_y fullnamepath: /pt1/ref_surf/deg_y coordinates: pt1_delta_time pt1_latitude pt1_longitude |
| pt1_ref_surf_dem_h: | Array of 32 bit Reals [pt1_ref_pt = 0..40569] DIMENSION_LABELS: ref_pt units: meters description: DEM elevation, derived from ATL06 /gtxx/atl06_segments/dem/dem_h long_name: DEM elevation source: ATL06 valid_min: -400.0000000 valid_max: 8400.000000 _FillValue: 3.402823466e+38 origname: dem_h fullnamepath: /pt1/ref_surf/dem_h coordinates: pt1_delta_time pt1_latitude pt1_longitude |
| pt1_ref_surf_e_slope: | Array of 32 bit Reals [pt1_ref_pt = 0..40569] DIMENSION_LABELS: ref_pt units: 1 description: the mean East-component slope for the reference surface within 50 m of the fit center long_name: east-component slope source: derived, ATL11 algorithm _FillValue: 3.402823466e+38 origname: e_slope fullnamepath: /pt1/ref_surf/e_slope coordinates: pt1_delta_time pt1_latitude pt1_longitude |
| pt1_ref_surf_fit_quality: | Array of 16 bit Integers [pt1_ref_pt = 0..40569] DIMENSION_LABELS: ref_pt units: 1 description: Indicates quality of the fit: 0: no problem identified, 1: One or more polynomial coefficients has an error of 10 or larger, 2: One or more surface slope components is greater than 0.02, 3: both 1 and 2 long_name: fit quality summary source: derived, ATL11 algorithm valid_min: 0 valid_max: 3 origname: fit_quality fullnamepath: /pt1/ref_surf/fit_quality coordinates: pt1_delta_time pt1_latitude pt1_longitude |
| pt1_ref_surf_geoid_free2mean: | Array of 32 bit Reals [pt1_ref_pt = 0..40569] DIMENSION_LABELS: ref_pt units: meters description: Additive value to convert geoid heights from the tide-free system to the mean-tide system, derived from ATL06 /gtxx/atl06_segments/dem/geoid_free2mean long_name: Geoid Free-to-Mean conversion source: ATL06 valid_min: -10.00000000 valid_max: 10.00000000 _FillValue: 3.402823466e+38 origname: geoid_free2mean fullnamepath: /pt1/ref_surf/geoid_free2mean coordinates: pt1_delta_time pt1_latitude pt1_longitude |
| pt1_ref_surf_geoid_h: | Array of 32 bit Reals [pt1_ref_pt = 0..40569] DIMENSION_LABELS: ref_pt units: meters description: Geoid height above WGS-84 reference ellipsoid in the tide-free system, derived from ATL06 /gtxx/atl06_segments/dem/geoid_h long_name: Geoid Height source: ATL06 valid_min: -110.0000000 valid_max: 500.0000000 _FillValue: 3.402823466e+38 origname: geoid_h fullnamepath: /pt1/ref_surf/geoid_h coordinates: pt1_delta_time pt1_latitude pt1_longitude |
| pt1_ref_surf_misfit_chi2r: | Array of 32 bit Reals [pt1_ref_pt = 0..40569] units: meters DIMENSION_LABELS: ref_pt description: misfit chi square, divided by the number of degrees in the solution long_name: misfit chi square source: derived, ATL11 algorithm valid_min: 0.000000000 _FillValue: 3.402823466e+38 origname: misfit_chi2r fullnamepath: /pt1/ref_surf/misfit_chi2r coordinates: pt1_delta_time pt1_latitude pt1_longitude |
| pt1_ref_surf_misfit_rms: | Array of 32 bit Reals [pt1_ref_pt = 0..40569] DIMENSION_LABELS: ref_pt units: meters description: RMS misfit for the surface-polynomial fit long_name: misfit RMS source: derived, ATL11 algorithm valid_min: 0.000000000 _FillValue: 3.402823466e+38 origname: misfit_rms fullnamepath: /pt1/ref_surf/misfit_rms coordinates: pt1_delta_time pt1_latitude pt1_longitude |
| pt1_ref_surf_n_slope: | Array of 32 bit Reals [pt1_ref_pt = 0..40569] DIMENSION_LABELS: ref_pt units: 1 description: the mean North-component slope for the reference surface within 50 m of the fit center long_name: north-component slope source: derived, ATL11 algorithm _FillValue: 3.402823466e+38 origname: n_slope fullnamepath: /pt1/ref_surf/n_slope coordinates: pt1_delta_time pt1_latitude pt1_longitude |
| pt1_ref_surf_poly_coeffs: | Array of 32 bit Reals [pt1_ref_pt = 0..40569][pt1_ref_surf_poly_exponent_x = 0..7] units: 1 long_name: polynomial coefficients DIMENSION_LABELS: ref_pt, (poly_exponent_x, poly_exponent_y) description: polynomial coefficients (up to degree 3), for polynomial components scaled by 100 m source: derived, ATL11 algorithm _FillValue: 3.402823466e+38 origname: poly_coeffs fullnamepath: /pt1/ref_surf/poly_coeffs coordinates: pt1_delta_time pt1_latitude pt1_longitude pt1_ref_surf_poly_exponent_x pt1_ref_surf_poly_exponent_y |
| pt1_ref_surf_poly_coeffs_sigma: | Array of 32 bit Reals [pt1_ref_pt = 0..40569][pt1_ref_surf_poly_exponent_x = 0..7] units: 1 description: formal errors for the polynomial coefficients long_name: polynomial coefficients error source: derived, ATL11 algorithm _FillValue: 3.402823466e+38 DIMENSION_LABELS: ref_pt, (poly_exponent_x, poly_exponent_y) origname: poly_coeffs_sigma fullnamepath: /pt1/ref_surf/poly_coeffs_sigma coordinates: pt1_delta_time pt1_latitude pt1_longitude pt1_ref_surf_poly_exponent_x pt1_ref_surf_poly_exponent_y |
| pt1_ref_surf_rgt_azimuth: | Array of 32 bit Reals [pt1_ref_pt = 0..40569] DIMENSION_LABELS: ref_pt units: degrees description: Reference track azimuth, in degrees east of local north long_name: RGT azimuth source: ATL06 valid_min: -180.0000000 valid_max: 180.0000000 _FillValue: 3.402823466e+38 origname: rgt_azimuth fullnamepath: /pt1/ref_surf/rgt_azimuth coordinates: pt1_delta_time pt1_latitude pt1_longitude |
| pt1_ref_surf_x_atc: | Array of 64 bit Reals [pt1_ref_pt = 0..40569] valid_min: 0.0000000000000000 valid_max: 40200000.000000000 _FillValue: 1.7976931348623157e+308 DIMENSION_LABELS: ref_pt units: meters description: Along-track coordinate of the reference point, measured along the RGT from its first equator crossing. long_name: Along track distance source: ATL06 origname: x_atc fullnamepath: /pt1/ref_surf/x_atc coordinates: pt1_delta_time pt1_latitude pt1_longitude |
| pt1_ref_surf_xt_slope: | Array of 32 bit Reals [pt1_ref_pt = 0..40569] DIMENSION_LABELS: ref_pt units: 1 description: Mean cross-track component of the slope of the reference surface within 50 m of the fit center long_name: across-track slope source: derived, ATL11 algorithm _FillValue: 3.402823466e+38 origname: xt_slope fullnamepath: /pt1/ref_surf/xt_slope coordinates: pt1_delta_time pt1_latitude pt1_longitude |
| pt1_ref_surf_y_atc: | Array of 64 bit Reals [pt1_ref_pt = 0..40569] DIMENSION_LABELS: ref_pt units: meters description: Across-track coordinate of the reference point, measured along the RGT from its first equator crossing. long_name: Across track distance source: ATL06 valid_min: -20000.000000000000 valid_max: 20000.000000000000 _FillValue: 1.7976931348623157e+308 origname: y_atc fullnamepath: /pt1/ref_surf/y_atc coordinates: pt1_delta_time pt1_latitude pt1_longitude |
| pt2_cycle_stats_atl06_summary_zero_count: | Array of 16 bit Integers [pt2_ref_pt = 0..40557][pt2_cycle_number = 0..25] description: Number of segments with ATL06_quality_summary==0 (0 indicates the best-quality data) long_name: ATL06 best quality count source: ATL06 DIMENSION_LABELS: ref_pt, cycle_number units: counts valid_min: 0 origname: atl06_summary_zero_count fullnamepath: /pt2/cycle_stats/atl06_summary_zero_count coordinates: pt2_delta_time pt2_latitude pt2_longitude pt2_cycle_number |
| pt2_cycle_stats_bsnow_conf: | Array of 16 bit Integers [pt2_ref_pt = 0..40557][pt2_cycle_number = 0..25] description: Maximum bsnow_conf flag from ATL06: indicates the greatest (among segments) confidence flag for presence of blowing snow for each cycle long_name: maxmimum blowing snow confidence flag source: ATL06 valid_min: -5 DIMENSION_LABELS: ref_pt, cycle_number units: 1 valid_max: 6 origname: bsnow_conf fullnamepath: /pt2/cycle_stats/bsnow_conf coordinates: pt2_delta_time pt2_latitude pt2_longitude pt2_cycle_number |
| pt2_cycle_stats_bsnow_h: | Array of 32 bit Reals [pt2_ref_pt = 0..40557][pt2_cycle_number = 0..25] units: meters description: Weighted-average blowing snow layer height for each cycle DIMENSION_LABELS: ref_pt, cycle_number long_name: weighted average blowing snow height source: ATL06 _FillValue: 3.402823466e+38 origname: bsnow_h fullnamepath: /pt2/cycle_stats/bsnow_h coordinates: pt2_delta_time pt2_latitude pt2_longitude pt2_cycle_number |
| pt2_cycle_stats_cloud_flg_asr: | Array of 16 bit Integers [pt2_ref_pt = 0..40557][pt2_cycle_number = 0..25] description: Minimum apparent-surface-reflectance -based cloud flag from ATL06: Flag indicates confidence that clouds with OT > 0.2 are present in the lower 3 km of the atmosphere based on ATL09 long_name: Minimum apparent surface reflectance flag source: ATL06 DIMENSION_LABELS: ref_pt, cycle_number units: 1 valid_min: 0 valid_max: 5 origname: cloud_flg_asr fullnamepath: /pt2/cycle_stats/cloud_flg_asr coordinates: pt2_delta_time pt2_latitude pt2_longitude pt2_cycle_number |
| pt2_cycle_stats_cloud_flg_atm: | Array of 16 bit Integers [pt2_ref_pt = 0..40557][pt2_cycle_number = 0..25] description: Minimum cloud flag from ATL06: Flag indicates confidence that clouds with OT > 0.2 are present in the lower 3 km of the atmosphere based on ATL09 long_name: minimum cloud flag source: ATL06 DIMENSION_LABELS: ref_pt, cycle_number units: 1 valid_min: 0 valid_max: 10 origname: cloud_flg_atm fullnamepath: /pt2/cycle_stats/cloud_flg_atm coordinates: pt2_delta_time pt2_latitude pt2_longitude pt2_cycle_number |
| pt2_cycle_stats_dac: | Array of 32 bit Reals [pt2_ref_pt = 0..40557][pt2_cycle_number = 0..25] units: meters description: Weighted-average dynamic atmosphere correction for each pass DIMENSION_LABELS: ref_pt, cycle_number long_name: weighted average dynamic atmosphere correction source: ATL06 valid_min: -50.00000000 valid_max: 50.00000000 _FillValue: 3.402823466e+38 origname: dac fullnamepath: /pt2/cycle_stats/dac coordinates: pt2_delta_time pt2_latitude pt2_longitude pt2_cycle_number |
| pt2_cycle_stats_dh_geoloc: | Array of 32 bit Reals [pt2_ref_pt = 0..40557][pt2_cycle_number = 0..25] units: meters description: Height correction to correct for Antarctic geolocation bias DIMENSION_LABELS: ref_pt, cycle_number long_name: geolocation height bias source: derived, ATL11 algorithm _FillValue: 3.402823466e+38 origname: dh_geoloc fullnamepath: /pt2/cycle_stats/dh_geoloc coordinates: pt2_delta_time pt2_latitude pt2_longitude pt2_cycle_number |
| pt2_cycle_stats_h_mean: | Array of 32 bit Reals [pt2_ref_pt = 0..40557][pt2_cycle_number = 0..25] description: Weighted-average of surface heights, not including the correction for the reference surface units: meters DIMENSION_LABELS: ref_pt, cycle_number long_name: weighted average uncorrected surface heights source: ATL06 valid_min: -460.0000000 valid_max: 8400.000000 _FillValue: 3.402823466e+38 origname: h_mean fullnamepath: /pt2/cycle_stats/h_mean coordinates: pt2_delta_time pt2_latitude pt2_longitude pt2_cycle_number |
| pt2_cycle_stats_h_rms_misfit: | Array of 32 bit Reals [pt2_ref_pt = 0..40557][pt2_cycle_number = 0..25] units: meters long_name: weighted average RMS fit error DIMENSION_LABELS: ref_pt, cycle_number description: Weighted-average RMS misfit between PE heights and along-track land-ice segment fit source: derived, ATL11 algorithm valid_min: 0.000000000 _FillValue: 3.402823466e+38 origname: h_rms_misfit fullnamepath: /pt2/cycle_stats/h_rms_misfit coordinates: pt2_delta_time pt2_latitude pt2_longitude pt2_cycle_number |
| pt2_cycle_stats_min_signal_selection_source: | Array of 16 bit Integers [pt2_ref_pt = 0..40557][pt2_cycle_number = 0..25] long_name: minimum signal selection source valid_min: 0 valid_max: 4 units: 1 DIMENSION_LABELS: ref_pt, cycle_number description: Minimum of the ATL06 signal_selection_source value (indicates the highest-quality segment in the cycle) source: ATL06 origname: min_signal_selection_source fullnamepath: /pt2/cycle_stats/min_signal_selection_source coordinates: pt2_delta_time pt2_latitude pt2_longitude pt2_cycle_number |
| pt2_cycle_stats_min_snr_significance: | Array of 32 bit Reals [pt2_ref_pt = 0..40557][pt2_cycle_number = 0..25] units: 1 long_name: minumum signal-noise ration significance DIMENSION_LABELS: ref_pt, cycle_number description: Minimum of SNR_significance (indicates the quality of the best segment in the cycle) source: ATL06 valid_min: 0.000000000 valid_max: 1.000000000 _FillValue: 3.402823466e+38 origname: min_snr_significance fullnamepath: /pt2/cycle_stats/min_snr_significance coordinates: pt2_delta_time pt2_latitude pt2_longitude pt2_cycle_number |
| pt2_cycle_stats_r_eff: | Array of 32 bit Reals [pt2_ref_pt = 0..40557][pt2_cycle_number = 0..25] units: 1 description: Weighted-average effective, uncorrected reflectance for each pass. DIMENSION_LABELS: ref_pt, cycle_number long_name: weighted average reflectance source: derived, ATL11 algorithm valid_min: 0.000000000 valid_max: 10.00000000 _FillValue: 3.402823466e+38 origname: r_eff fullnamepath: /pt2/cycle_stats/r_eff coordinates: pt2_delta_time pt2_latitude pt2_longitude pt2_cycle_number |
| pt2_cycle_stats_seg_count: | Array of 32 bit Integers [pt2_ref_pt = 0..40557][pt2_cycle_number = 0..25] description: Number of segments marked as valid for each cycle. Equal to 0 for those cycles not included in the reference-surface shape fit. long_name: number valid segments source: ATL06 valid_min: 0 valid_max: 14 DIMENSION_LABELS: ref_pt, cycle_number units: counts origname: seg_count fullnamepath: /pt2/cycle_stats/seg_count coordinates: pt2_delta_time pt2_latitude pt2_longitude pt2_cycle_number |
| pt2_cycle_stats_sigma_geo_at: | Array of 32 bit Reals [pt2_ref_pt = 0..40557][pt2_cycle_number = 0..25] DIMENSION_LABELS: ref_pt, cycle_number units: meters description: Root-mean-weighted-square-average local-coordinate x horizontal geolocation error for each cycle due to PPD and POD source: ATL06 long_name: average horizontal x-coordinate geolocation error valid_min: 0.000000000 _FillValue: 3.402823466e+38 origname: sigma_geo_at fullnamepath: /pt2/cycle_stats/sigma_geo_at coordinates: pt2_delta_time pt2_latitude pt2_longitude pt2_cycle_number |
| pt2_cycle_stats_sigma_geo_h: | Array of 32 bit Reals [pt2_ref_pt = 0..40557][pt2_cycle_number = 0..25] DIMENSION_LABELS: ref_pt, cycle_number units: meters description: Root-mean-weighted-square-average total vertical geolocation error due to PPD and POD long_name: average vertical geolocation error source: ATL06 valid_min: 0.000000000 _FillValue: 3.402823466e+38 origname: sigma_geo_h fullnamepath: /pt2/cycle_stats/sigma_geo_h coordinates: pt2_delta_time pt2_latitude pt2_longitude pt2_cycle_number |
| pt2_cycle_stats_sigma_geo_xt: | Array of 32 bit Reals [pt2_ref_pt = 0..40557][pt2_cycle_number = 0..25] units: meters DIMENSION_LABELS: ref_pt, cycle_number description: Root-mean-weighted-square-average local-coordinate y horizontal geolocation error for each cycle due to PPD and POD long_name: average horizontal y-coordinate geolocation error source: ATL06 valid_min: 0.000000000 _FillValue: 3.402823466e+38 origname: sigma_geo_xt fullnamepath: /pt2/cycle_stats/sigma_geo_xt coordinates: pt2_delta_time pt2_latitude pt2_longitude pt2_cycle_number |
| pt2_cycle_stats_tide_ocean: | Array of 32 bit Reals [pt2_ref_pt = 0..40557][pt2_cycle_number = 0..25] units: meters DIMENSION_LABELS: ref_pt, cycle_number description: Weighted-average ocean tide for each pass long_name: weighted average ocean tide source: ATL06 valid_min: -50.00000000 valid_max: 50.00000000 _FillValue: 3.402823466e+38 origname: tide_ocean fullnamepath: /pt2/cycle_stats/tide_ocean coordinates: pt2_delta_time pt2_latitude pt2_longitude pt2_cycle_number |
| pt2_cycle_stats_x_atc: | Array of 64 bit Reals [pt2_ref_pt = 0..40557][pt2_cycle_number = 0..25] units: meters description: weighted average of pair-center RGT x coordinates for each cycle long_name: weighted average rgt x-coordinates source: ATL06 valid_min: 0.0000000000000000 DIMENSION_LABELS: ref_pt, cycle_number valid_max: 40200000.000000000 _FillValue: 1.7976931348623157e+308 origname: x_atc fullnamepath: /pt2/cycle_stats/x_atc coordinates: pt2_delta_time pt2_latitude pt2_longitude pt2_cycle_number |
| pt2_cycle_stats_y_atc: | Array of 64 bit Reals [pt2_ref_pt = 0..40557][pt2_cycle_number = 0..25] units: meters description: weighted mean of pair-center RGT y coordinates for each cycle long_name: weighted average rgt y-coordinates source: ATL06 valid_min: -30000.000000000000 valid_max: 30000.000000000000 DIMENSION_LABELS: ref_pt, cycle_number _FillValue: 1.7976931348623157e+308 origname: y_atc fullnamepath: /pt2/cycle_stats/y_atc coordinates: pt2_delta_time pt2_latitude pt2_longitude pt2_cycle_number |
| pt2_delta_time: | Array of 64 bit Reals [pt2_ref_pt = 0..40557][pt2_cycle_number = 0..25] description: Mean number of GPS seconds since the ATLAS SDP epoch long_name: Elapsed GPS seconds source: ATL06 valid_min: 0.0000000000000000 _FillValue: 1.7976931348623157e+308 DIMENSION_LABELS: ref_pt, cycle_number units: seconds since 2018-01-01 origname: delta_time fullnamepath: /pt2/delta_time coordinates: pt2_latitude pt2_longitude |
| pt2_h_corr: | Array of 32 bit Reals [pt2_ref_pt = 0..40557][pt2_cycle_number = 0..25] DIMENSION_LABELS: ref_pt, cycle_number units: meters description: the mean corrected height long_name: mean corrected height source: derived, ATL11 algorithm valid_min: -460.0000000 valid_max: 8400.000000 _FillValue: 3.402823466e+38 origname: h_corr fullnamepath: /pt2/h_corr coordinates: pt2_delta_time pt2_latitude pt2_longitude |
| pt2_h_corr_sigma: | Array of 32 bit Reals [pt2_ref_pt = 0..40557][pt2_cycle_number = 0..25] source: derived, ATL11 algorithm valid_min: 0.000000000 valid_max: 15.00000000 _FillValue: 3.402823466e+38 DIMENSION_LABELS: ref_pt, cycle_number units: meters description: the formal error in the corrected height long_name: mean corrected height error origname: h_corr_sigma fullnamepath: /pt2/h_corr_sigma coordinates: pt2_delta_time pt2_latitude pt2_longitude pt2_cycle_number |
| pt2_h_corr_sigma_systematic: | Array of 32 bit Reals [pt2_ref_pt = 0..40557][pt2_cycle_number = 0..25] description: the magnitude of all errors that might be correlated at scales larger than a single fit center (e.g. pointing errors, GPS errors, etc) valid_min: 0.000000000 _FillValue: 3.402823466e+38 DIMENSION_LABELS: ref_pt, cycle_number units: meters long_name: corrected height error source: derived, ATL11 algorithm origname: h_corr_sigma_systematic fullnamepath: /pt2/h_corr_sigma_systematic coordinates: pt2_delta_time pt2_latitude pt2_longitude pt2_cycle_number |
| pt2_latitude: | Array of 64 bit Reals [pt2_ref_pt = 0..40557] DIMENSION_LABELS: ref_pt units: degrees North description: center latitude based on selected segments long_name: latitude source: ATL06 segments valid_min: -90.000000000000000 valid_max: 90.000000000000000 _FillValue: 1.7976931348623157e+308 origname: latitude fullnamepath: /pt2/latitude coordinates: pt2_delta_time pt2_longitude |
| pt2_longitude: | Array of 64 bit Reals [pt2_ref_pt = 0..40557] DIMENSION_LABELS: ref_pt units: degrees East description: center longitude based on selected segments long_name: longitude source: ATL06 segments valid_min: -180.00000000000000 valid_max: 180.00000000000000 _FillValue: 1.7976931348623157e+308 origname: longitude fullnamepath: /pt2/longitude coordinates: pt2_delta_time pt2_latitude |
| pt2_quality_summary: | Array of 16 bit Integers [pt2_ref_pt = 0..40557][pt2_cycle_number = 0..25] units: 1 description: Summary flag: zero indicates high-quality cycles: where min_signal_selection_source <=1 and min_SNR_significance < 0.02, and ATL06_summary_zero_count >0. long_name: quality summary source: derived, ATL11 algorithm valid_min: 0 valid_max: 1 DIMENSION_LABELS: ref_pt, cycle_number origname: quality_summary fullnamepath: /pt2/quality_summary coordinates: pt2_delta_time pt2_latitude pt2_longitude pt2_cycle_number |
| pt2_ref_surf_at_slope: | Array of 32 bit Reals [pt2_ref_pt = 0..40557] DIMENSION_LABELS: ref_pt units: 1 description: Mean along-track component of the slope of the reference surface within 50 m of the fit center long_name: along-track slope source: derived, ATL11 algorithm _FillValue: 3.402823466e+38 origname: at_slope fullnamepath: /pt2/ref_surf/at_slope coordinates: pt2_delta_time pt2_latitude pt2_longitude |
| pt2_ref_surf_complex_surface_flag: | Array of 16 bit Integers [pt2_ref_pt = 0..40557] DIMENSION_LABELS: ref_pt units: 1 long_name: complex surface flag description: 0 indicates that normal fitting was attempted, 1 indicates that the signal selection algorithm rejected too many repeats, and only a linear fit was attempted source: derived, ATL11 algorithm valid_min: 0 valid_max: 1 origname: complex_surface_flag fullnamepath: /pt2/ref_surf/complex_surface_flag coordinates: pt2_delta_time pt2_latitude pt2_longitude |
| pt2_ref_surf_curvature: | Array of 32 bit Reals [pt2_ref_pt = 0..40557] DIMENSION_LABELS: ref_pt units: 1 description: the RMS of the slope of the fit polynomial within 50 m of the fit center long_name: curvature source: derived, ATL11 algorithm valid_min: 0.000000000 _FillValue: 3.402823466e+38 origname: curvature fullnamepath: /pt2/ref_surf/curvature coordinates: pt2_delta_time pt2_latitude pt2_longitude |
| pt2_ref_surf_deg_x: | Array of 16 bit Integers [pt2_ref_pt = 0..40557] DIMENSION_LABELS: ref_pt units: counts description: Maximum degree of non-zero polynomial components in x long_name: max-degree x polynomial source: derived, ATL11 algorithm valid_min: 0 valid_max: 3 origname: deg_x fullnamepath: /pt2/ref_surf/deg_x coordinates: pt2_delta_time pt2_latitude pt2_longitude |
| pt2_ref_surf_deg_y: | Array of 16 bit Integers [pt2_ref_pt = 0..40557] DIMENSION_LABELS: ref_pt units: counts description: Maximum degree of non-zero polynomial components in y long_name: max-degree y polynomial source: derived, ATL11 algorithm valid_min: 0 valid_max: 3 origname: deg_y fullnamepath: /pt2/ref_surf/deg_y coordinates: pt2_delta_time pt2_latitude pt2_longitude |
| pt2_ref_surf_dem_h: | Array of 32 bit Reals [pt2_ref_pt = 0..40557] DIMENSION_LABELS: ref_pt units: meters description: DEM elevation, derived from ATL06 /gtxx/atl06_segments/dem/dem_h long_name: DEM elevation source: ATL06 valid_min: -400.0000000 valid_max: 8400.000000 _FillValue: 3.402823466e+38 origname: dem_h fullnamepath: /pt2/ref_surf/dem_h coordinates: pt2_delta_time pt2_latitude pt2_longitude |
| pt2_ref_surf_e_slope: | Array of 32 bit Reals [pt2_ref_pt = 0..40557] DIMENSION_LABELS: ref_pt units: 1 description: the mean East-component slope for the reference surface within 50 m of the fit center long_name: east-component slope source: derived, ATL11 algorithm _FillValue: 3.402823466e+38 origname: e_slope fullnamepath: /pt2/ref_surf/e_slope coordinates: pt2_delta_time pt2_latitude pt2_longitude |
| pt2_ref_surf_fit_quality: | Array of 16 bit Integers [pt2_ref_pt = 0..40557] DIMENSION_LABELS: ref_pt units: 1 description: Indicates quality of the fit: 0: no problem identified, 1: One or more polynomial coefficients has an error of 10 or larger, 2: One or more surface slope components is greater than 0.02, 3: both 1 and 2 long_name: fit quality summary source: derived, ATL11 algorithm valid_min: 0 valid_max: 3 origname: fit_quality fullnamepath: /pt2/ref_surf/fit_quality coordinates: pt2_delta_time pt2_latitude pt2_longitude |
| pt2_ref_surf_geoid_free2mean: | Array of 32 bit Reals [pt2_ref_pt = 0..40557] DIMENSION_LABELS: ref_pt units: meters description: Additive value to convert geoid heights from the tide-free system to the mean-tide system, derived from ATL06 /gtxx/atl06_segments/dem/geoid_free2mean long_name: Geoid Free-to-Mean conversion source: ATL06 valid_min: -10.00000000 valid_max: 10.00000000 _FillValue: 3.402823466e+38 origname: geoid_free2mean fullnamepath: /pt2/ref_surf/geoid_free2mean coordinates: pt2_delta_time pt2_latitude pt2_longitude |
| pt2_ref_surf_geoid_h: | Array of 32 bit Reals [pt2_ref_pt = 0..40557] DIMENSION_LABELS: ref_pt units: meters description: Geoid height above WGS-84 reference ellipsoid in the tide-free system, derived from ATL06 /gtxx/atl06_segments/dem/geoid_h long_name: Geoid Height source: ATL06 valid_min: -110.0000000 valid_max: 500.0000000 _FillValue: 3.402823466e+38 origname: geoid_h fullnamepath: /pt2/ref_surf/geoid_h coordinates: pt2_delta_time pt2_latitude pt2_longitude |
| pt2_ref_surf_misfit_chi2r: | Array of 32 bit Reals [pt2_ref_pt = 0..40557] units: meters DIMENSION_LABELS: ref_pt description: misfit chi square, divided by the number of degrees in the solution long_name: misfit chi square source: derived, ATL11 algorithm valid_min: 0.000000000 _FillValue: 3.402823466e+38 origname: misfit_chi2r fullnamepath: /pt2/ref_surf/misfit_chi2r coordinates: pt2_delta_time pt2_latitude pt2_longitude |
| pt2_ref_surf_misfit_rms: | Array of 32 bit Reals [pt2_ref_pt = 0..40557] DIMENSION_LABELS: ref_pt units: meters description: RMS misfit for the surface-polynomial fit long_name: misfit RMS source: derived, ATL11 algorithm valid_min: 0.000000000 _FillValue: 3.402823466e+38 origname: misfit_rms fullnamepath: /pt2/ref_surf/misfit_rms coordinates: pt2_delta_time pt2_latitude pt2_longitude |
| pt2_ref_surf_n_slope: | Array of 32 bit Reals [pt2_ref_pt = 0..40557] DIMENSION_LABELS: ref_pt units: 1 description: the mean North-component slope for the reference surface within 50 m of the fit center long_name: north-component slope source: derived, ATL11 algorithm _FillValue: 3.402823466e+38 origname: n_slope fullnamepath: /pt2/ref_surf/n_slope coordinates: pt2_delta_time pt2_latitude pt2_longitude |
| pt2_ref_surf_poly_coeffs: | Array of 32 bit Reals [pt2_ref_pt = 0..40557][pt2_ref_surf_poly_exponent_x = 0..7] units: 1 long_name: polynomial coefficients DIMENSION_LABELS: ref_pt, (poly_exponent_x, poly_exponent_y) description: polynomial coefficients (up to degree 3), for polynomial components scaled by 100 m source: derived, ATL11 algorithm _FillValue: 3.402823466e+38 origname: poly_coeffs fullnamepath: /pt2/ref_surf/poly_coeffs coordinates: pt2_delta_time pt2_latitude pt2_longitude pt2_ref_surf_poly_exponent_x pt2_ref_surf_poly_exponent_y |
| pt2_ref_surf_poly_coeffs_sigma: | Array of 32 bit Reals [pt2_ref_pt = 0..40557][pt2_ref_surf_poly_exponent_x = 0..7] units: 1 description: formal errors for the polynomial coefficients long_name: polynomial coefficients error source: derived, ATL11 algorithm _FillValue: 3.402823466e+38 DIMENSION_LABELS: ref_pt, (poly_exponent_x, poly_exponent_y) origname: poly_coeffs_sigma fullnamepath: /pt2/ref_surf/poly_coeffs_sigma coordinates: pt2_delta_time pt2_latitude pt2_longitude pt2_ref_surf_poly_exponent_x pt2_ref_surf_poly_exponent_y |
| pt2_ref_surf_rgt_azimuth: | Array of 32 bit Reals [pt2_ref_pt = 0..40557] DIMENSION_LABELS: ref_pt units: degrees description: Reference track azimuth, in degrees east of local north long_name: RGT azimuth source: ATL06 valid_min: -180.0000000 valid_max: 180.0000000 _FillValue: 3.402823466e+38 origname: rgt_azimuth fullnamepath: /pt2/ref_surf/rgt_azimuth coordinates: pt2_delta_time pt2_latitude pt2_longitude |
| pt2_ref_surf_x_atc: | Array of 64 bit Reals [pt2_ref_pt = 0..40557] valid_min: 0.0000000000000000 valid_max: 40200000.000000000 _FillValue: 1.7976931348623157e+308 DIMENSION_LABELS: ref_pt units: meters description: Along-track coordinate of the reference point, measured along the RGT from its first equator crossing. long_name: Along track distance source: ATL06 origname: x_atc fullnamepath: /pt2/ref_surf/x_atc coordinates: pt2_delta_time pt2_latitude pt2_longitude |
| pt2_ref_surf_xt_slope: | Array of 32 bit Reals [pt2_ref_pt = 0..40557] DIMENSION_LABELS: ref_pt units: 1 description: Mean cross-track component of the slope of the reference surface within 50 m of the fit center long_name: across-track slope source: derived, ATL11 algorithm _FillValue: 3.402823466e+38 origname: xt_slope fullnamepath: /pt2/ref_surf/xt_slope coordinates: pt2_delta_time pt2_latitude pt2_longitude |
| pt2_ref_surf_y_atc: | Array of 64 bit Reals [pt2_ref_pt = 0..40557] DIMENSION_LABELS: ref_pt units: meters description: Across-track coordinate of the reference point, measured along the RGT from its first equator crossing. long_name: Across track distance source: ATL06 valid_min: -20000.000000000000 valid_max: 20000.000000000000 _FillValue: 1.7976931348623157e+308 origname: y_atc fullnamepath: /pt2/ref_surf/y_atc coordinates: pt2_delta_time pt2_latitude pt2_longitude |
| pt3_cycle_stats_atl06_summary_zero_count: | Array of 16 bit Integers [pt3_ref_pt = 0..40534][pt3_cycle_number = 0..25] description: Number of segments with ATL06_quality_summary==0 (0 indicates the best-quality data) long_name: ATL06 best quality count source: ATL06 DIMENSION_LABELS: ref_pt, cycle_number units: counts valid_min: 0 origname: atl06_summary_zero_count fullnamepath: /pt3/cycle_stats/atl06_summary_zero_count coordinates: pt3_delta_time pt3_latitude pt3_longitude pt3_cycle_number |
| pt3_cycle_stats_bsnow_conf: | Array of 16 bit Integers [pt3_ref_pt = 0..40534][pt3_cycle_number = 0..25] description: Maximum bsnow_conf flag from ATL06: indicates the greatest (among segments) confidence flag for presence of blowing snow for each cycle long_name: maxmimum blowing snow confidence flag source: ATL06 valid_min: -5 DIMENSION_LABELS: ref_pt, cycle_number units: 1 valid_max: 6 origname: bsnow_conf fullnamepath: /pt3/cycle_stats/bsnow_conf coordinates: pt3_delta_time pt3_latitude pt3_longitude pt3_cycle_number |
| pt3_cycle_stats_bsnow_h: | Array of 32 bit Reals [pt3_ref_pt = 0..40534][pt3_cycle_number = 0..25] units: meters description: Weighted-average blowing snow layer height for each cycle DIMENSION_LABELS: ref_pt, cycle_number long_name: weighted average blowing snow height source: ATL06 _FillValue: 3.402823466e+38 origname: bsnow_h fullnamepath: /pt3/cycle_stats/bsnow_h coordinates: pt3_delta_time pt3_latitude pt3_longitude pt3_cycle_number |
| pt3_cycle_stats_cloud_flg_asr: | Array of 16 bit Integers [pt3_ref_pt = 0..40534][pt3_cycle_number = 0..25] description: Minimum apparent-surface-reflectance -based cloud flag from ATL06: Flag indicates confidence that clouds with OT > 0.2 are present in the lower 3 km of the atmosphere based on ATL09 long_name: Minimum apparent surface reflectance flag source: ATL06 DIMENSION_LABELS: ref_pt, cycle_number units: 1 valid_min: 0 valid_max: 5 origname: cloud_flg_asr fullnamepath: /pt3/cycle_stats/cloud_flg_asr coordinates: pt3_delta_time pt3_latitude pt3_longitude pt3_cycle_number |
| pt3_cycle_stats_cloud_flg_atm: | Array of 16 bit Integers [pt3_ref_pt = 0..40534][pt3_cycle_number = 0..25] description: Minimum cloud flag from ATL06: Flag indicates confidence that clouds with OT > 0.2 are present in the lower 3 km of the atmosphere based on ATL09 long_name: minimum cloud flag source: ATL06 DIMENSION_LABELS: ref_pt, cycle_number units: 1 valid_min: 0 valid_max: 10 origname: cloud_flg_atm fullnamepath: /pt3/cycle_stats/cloud_flg_atm coordinates: pt3_delta_time pt3_latitude pt3_longitude pt3_cycle_number |
| pt3_cycle_stats_dac: | Array of 32 bit Reals [pt3_ref_pt = 0..40534][pt3_cycle_number = 0..25] units: meters description: Weighted-average dynamic atmosphere correction for each pass DIMENSION_LABELS: ref_pt, cycle_number long_name: weighted average dynamic atmosphere correction source: ATL06 valid_min: -50.00000000 valid_max: 50.00000000 _FillValue: 3.402823466e+38 origname: dac fullnamepath: /pt3/cycle_stats/dac coordinates: pt3_delta_time pt3_latitude pt3_longitude pt3_cycle_number |
| pt3_cycle_stats_dh_geoloc: | Array of 32 bit Reals [pt3_ref_pt = 0..40534][pt3_cycle_number = 0..25] units: meters description: Height correction to correct for Antarctic geolocation bias DIMENSION_LABELS: ref_pt, cycle_number long_name: geolocation height bias source: derived, ATL11 algorithm _FillValue: 3.402823466e+38 origname: dh_geoloc fullnamepath: /pt3/cycle_stats/dh_geoloc coordinates: pt3_delta_time pt3_latitude pt3_longitude pt3_cycle_number |
| pt3_cycle_stats_h_mean: | Array of 32 bit Reals [pt3_ref_pt = 0..40534][pt3_cycle_number = 0..25] description: Weighted-average of surface heights, not including the correction for the reference surface units: meters DIMENSION_LABELS: ref_pt, cycle_number long_name: weighted average uncorrected surface heights source: ATL06 valid_min: -460.0000000 valid_max: 8400.000000 _FillValue: 3.402823466e+38 origname: h_mean fullnamepath: /pt3/cycle_stats/h_mean coordinates: pt3_delta_time pt3_latitude pt3_longitude pt3_cycle_number |
| pt3_cycle_stats_h_rms_misfit: | Array of 32 bit Reals [pt3_ref_pt = 0..40534][pt3_cycle_number = 0..25] units: meters long_name: weighted average RMS fit error DIMENSION_LABELS: ref_pt, cycle_number description: Weighted-average RMS misfit between PE heights and along-track land-ice segment fit source: derived, ATL11 algorithm valid_min: 0.000000000 _FillValue: 3.402823466e+38 origname: h_rms_misfit fullnamepath: /pt3/cycle_stats/h_rms_misfit coordinates: pt3_delta_time pt3_latitude pt3_longitude pt3_cycle_number |
| pt3_cycle_stats_min_signal_selection_source: | Array of 16 bit Integers [pt3_ref_pt = 0..40534][pt3_cycle_number = 0..25] long_name: minimum signal selection source valid_min: 0 valid_max: 4 units: 1 DIMENSION_LABELS: ref_pt, cycle_number description: Minimum of the ATL06 signal_selection_source value (indicates the highest-quality segment in the cycle) source: ATL06 origname: min_signal_selection_source fullnamepath: /pt3/cycle_stats/min_signal_selection_source coordinates: pt3_delta_time pt3_latitude pt3_longitude pt3_cycle_number |
| pt3_cycle_stats_min_snr_significance: | Array of 32 bit Reals [pt3_ref_pt = 0..40534][pt3_cycle_number = 0..25] units: 1 long_name: minumum signal-noise ration significance DIMENSION_LABELS: ref_pt, cycle_number description: Minimum of SNR_significance (indicates the quality of the best segment in the cycle) source: ATL06 valid_min: 0.000000000 valid_max: 1.000000000 _FillValue: 3.402823466e+38 origname: min_snr_significance fullnamepath: /pt3/cycle_stats/min_snr_significance coordinates: pt3_delta_time pt3_latitude pt3_longitude pt3_cycle_number |
| pt3_cycle_stats_r_eff: | Array of 32 bit Reals [pt3_ref_pt = 0..40534][pt3_cycle_number = 0..25] units: 1 description: Weighted-average effective, uncorrected reflectance for each pass. DIMENSION_LABELS: ref_pt, cycle_number long_name: weighted average reflectance source: derived, ATL11 algorithm valid_min: 0.000000000 valid_max: 10.00000000 _FillValue: 3.402823466e+38 origname: r_eff fullnamepath: /pt3/cycle_stats/r_eff coordinates: pt3_delta_time pt3_latitude pt3_longitude pt3_cycle_number |
| pt3_cycle_stats_seg_count: | Array of 32 bit Integers [pt3_ref_pt = 0..40534][pt3_cycle_number = 0..25] description: Number of segments marked as valid for each cycle. Equal to 0 for those cycles not included in the reference-surface shape fit. long_name: number valid segments source: ATL06 valid_min: 0 valid_max: 14 DIMENSION_LABELS: ref_pt, cycle_number units: counts origname: seg_count fullnamepath: /pt3/cycle_stats/seg_count coordinates: pt3_delta_time pt3_latitude pt3_longitude pt3_cycle_number |
| pt3_cycle_stats_sigma_geo_at: | Array of 32 bit Reals [pt3_ref_pt = 0..40534][pt3_cycle_number = 0..25] DIMENSION_LABELS: ref_pt, cycle_number units: meters description: Root-mean-weighted-square-average local-coordinate x horizontal geolocation error for each cycle due to PPD and POD source: ATL06 long_name: average horizontal x-coordinate geolocation error valid_min: 0.000000000 _FillValue: 3.402823466e+38 origname: sigma_geo_at fullnamepath: /pt3/cycle_stats/sigma_geo_at coordinates: pt3_delta_time pt3_latitude pt3_longitude pt3_cycle_number |
| pt3_cycle_stats_sigma_geo_h: | Array of 32 bit Reals [pt3_ref_pt = 0..40534][pt3_cycle_number = 0..25] DIMENSION_LABELS: ref_pt, cycle_number units: meters description: Root-mean-weighted-square-average total vertical geolocation error due to PPD and POD long_name: average vertical geolocation error source: ATL06 valid_min: 0.000000000 _FillValue: 3.402823466e+38 origname: sigma_geo_h fullnamepath: /pt3/cycle_stats/sigma_geo_h coordinates: pt3_delta_time pt3_latitude pt3_longitude pt3_cycle_number |
| pt3_cycle_stats_sigma_geo_xt: | Array of 32 bit Reals [pt3_ref_pt = 0..40534][pt3_cycle_number = 0..25] units: meters DIMENSION_LABELS: ref_pt, cycle_number description: Root-mean-weighted-square-average local-coordinate y horizontal geolocation error for each cycle due to PPD and POD long_name: average horizontal y-coordinate geolocation error source: ATL06 valid_min: 0.000000000 _FillValue: 3.402823466e+38 origname: sigma_geo_xt fullnamepath: /pt3/cycle_stats/sigma_geo_xt coordinates: pt3_delta_time pt3_latitude pt3_longitude pt3_cycle_number |
| pt3_cycle_stats_tide_ocean: | Array of 32 bit Reals [pt3_ref_pt = 0..40534][pt3_cycle_number = 0..25] units: meters DIMENSION_LABELS: ref_pt, cycle_number description: Weighted-average ocean tide for each pass long_name: weighted average ocean tide source: ATL06 valid_min: -50.00000000 valid_max: 50.00000000 _FillValue: 3.402823466e+38 origname: tide_ocean fullnamepath: /pt3/cycle_stats/tide_ocean coordinates: pt3_delta_time pt3_latitude pt3_longitude pt3_cycle_number |
| pt3_cycle_stats_x_atc: | Array of 64 bit Reals [pt3_ref_pt = 0..40534][pt3_cycle_number = 0..25] units: meters description: weighted average of pair-center RGT x coordinates for each cycle long_name: weighted average rgt x-coordinates source: ATL06 valid_min: 0.0000000000000000 DIMENSION_LABELS: ref_pt, cycle_number valid_max: 40200000.000000000 _FillValue: 1.7976931348623157e+308 origname: x_atc fullnamepath: /pt3/cycle_stats/x_atc coordinates: pt3_delta_time pt3_latitude pt3_longitude pt3_cycle_number |
| pt3_cycle_stats_y_atc: | Array of 64 bit Reals [pt3_ref_pt = 0..40534][pt3_cycle_number = 0..25] units: meters description: weighted mean of pair-center RGT y coordinates for each cycle long_name: weighted average rgt y-coordinates source: ATL06 valid_min: -30000.000000000000 valid_max: 30000.000000000000 DIMENSION_LABELS: ref_pt, cycle_number _FillValue: 1.7976931348623157e+308 origname: y_atc fullnamepath: /pt3/cycle_stats/y_atc coordinates: pt3_delta_time pt3_latitude pt3_longitude pt3_cycle_number |
| pt3_delta_time: | Array of 64 bit Reals [pt3_ref_pt = 0..40534][pt3_cycle_number = 0..25] description: Mean number of GPS seconds since the ATLAS SDP epoch long_name: Elapsed GPS seconds source: ATL06 valid_min: 0.0000000000000000 _FillValue: 1.7976931348623157e+308 DIMENSION_LABELS: ref_pt, cycle_number units: seconds since 2018-01-01 origname: delta_time fullnamepath: /pt3/delta_time coordinates: pt3_latitude pt3_longitude |
| pt3_h_corr: | Array of 32 bit Reals [pt3_ref_pt = 0..40534][pt3_cycle_number = 0..25] DIMENSION_LABELS: ref_pt, cycle_number units: meters description: the mean corrected height long_name: mean corrected height source: derived, ATL11 algorithm valid_min: -460.0000000 valid_max: 8400.000000 _FillValue: 3.402823466e+38 origname: h_corr fullnamepath: /pt3/h_corr coordinates: pt3_delta_time pt3_latitude pt3_longitude |
| pt3_h_corr_sigma: | Array of 32 bit Reals [pt3_ref_pt = 0..40534][pt3_cycle_number = 0..25] source: derived, ATL11 algorithm valid_min: 0.000000000 valid_max: 15.00000000 _FillValue: 3.402823466e+38 DIMENSION_LABELS: ref_pt, cycle_number units: meters description: the formal error in the corrected height long_name: mean corrected height error origname: h_corr_sigma fullnamepath: /pt3/h_corr_sigma coordinates: pt3_delta_time pt3_latitude pt3_longitude pt3_cycle_number |
| pt3_h_corr_sigma_systematic: | Array of 32 bit Reals [pt3_ref_pt = 0..40534][pt3_cycle_number = 0..25] description: the magnitude of all errors that might be correlated at scales larger than a single fit center (e.g. pointing errors, GPS errors, etc) valid_min: 0.000000000 _FillValue: 3.402823466e+38 DIMENSION_LABELS: ref_pt, cycle_number units: meters long_name: corrected height error source: derived, ATL11 algorithm origname: h_corr_sigma_systematic fullnamepath: /pt3/h_corr_sigma_systematic coordinates: pt3_delta_time pt3_latitude pt3_longitude pt3_cycle_number |
| pt3_latitude: | Array of 64 bit Reals [pt3_ref_pt = 0..40534] DIMENSION_LABELS: ref_pt units: degrees North description: center latitude based on selected segments long_name: latitude source: ATL06 segments valid_min: -90.000000000000000 valid_max: 90.000000000000000 _FillValue: 1.7976931348623157e+308 origname: latitude fullnamepath: /pt3/latitude coordinates: pt3_delta_time pt3_longitude |
| pt3_longitude: | Array of 64 bit Reals [pt3_ref_pt = 0..40534] DIMENSION_LABELS: ref_pt units: degrees East description: center longitude based on selected segments long_name: longitude source: ATL06 segments valid_min: -180.00000000000000 valid_max: 180.00000000000000 _FillValue: 1.7976931348623157e+308 origname: longitude fullnamepath: /pt3/longitude coordinates: pt3_delta_time pt3_latitude |
| pt3_quality_summary: | Array of 16 bit Integers [pt3_ref_pt = 0..40534][pt3_cycle_number = 0..25] units: 1 description: Summary flag: zero indicates high-quality cycles: where min_signal_selection_source <=1 and min_SNR_significance < 0.02, and ATL06_summary_zero_count >0. long_name: quality summary source: derived, ATL11 algorithm valid_min: 0 valid_max: 1 DIMENSION_LABELS: ref_pt, cycle_number origname: quality_summary fullnamepath: /pt3/quality_summary coordinates: pt3_delta_time pt3_latitude pt3_longitude pt3_cycle_number |
| pt3_ref_surf_at_slope: | Array of 32 bit Reals [pt3_ref_pt = 0..40534] DIMENSION_LABELS: ref_pt units: 1 description: Mean along-track component of the slope of the reference surface within 50 m of the fit center long_name: along-track slope source: derived, ATL11 algorithm _FillValue: 3.402823466e+38 origname: at_slope fullnamepath: /pt3/ref_surf/at_slope coordinates: pt3_delta_time pt3_latitude pt3_longitude |
| pt3_ref_surf_complex_surface_flag: | Array of 16 bit Integers [pt3_ref_pt = 0..40534] DIMENSION_LABELS: ref_pt units: 1 long_name: complex surface flag description: 0 indicates that normal fitting was attempted, 1 indicates that the signal selection algorithm rejected too many repeats, and only a linear fit was attempted source: derived, ATL11 algorithm valid_min: 0 valid_max: 1 origname: complex_surface_flag fullnamepath: /pt3/ref_surf/complex_surface_flag coordinates: pt3_delta_time pt3_latitude pt3_longitude |
| pt3_ref_surf_curvature: | Array of 32 bit Reals [pt3_ref_pt = 0..40534] DIMENSION_LABELS: ref_pt units: 1 description: the RMS of the slope of the fit polynomial within 50 m of the fit center long_name: curvature source: derived, ATL11 algorithm valid_min: 0.000000000 _FillValue: 3.402823466e+38 origname: curvature fullnamepath: /pt3/ref_surf/curvature coordinates: pt3_delta_time pt3_latitude pt3_longitude |
| pt3_ref_surf_deg_x: | Array of 16 bit Integers [pt3_ref_pt = 0..40534] DIMENSION_LABELS: ref_pt units: counts description: Maximum degree of non-zero polynomial components in x long_name: max-degree x polynomial source: derived, ATL11 algorithm valid_min: 0 valid_max: 3 origname: deg_x fullnamepath: /pt3/ref_surf/deg_x coordinates: pt3_delta_time pt3_latitude pt3_longitude |
| pt3_ref_surf_deg_y: | Array of 16 bit Integers [pt3_ref_pt = 0..40534] DIMENSION_LABELS: ref_pt units: counts description: Maximum degree of non-zero polynomial components in y long_name: max-degree y polynomial source: derived, ATL11 algorithm valid_min: 0 valid_max: 3 origname: deg_y fullnamepath: /pt3/ref_surf/deg_y coordinates: pt3_delta_time pt3_latitude pt3_longitude |
| pt3_ref_surf_dem_h: | Array of 32 bit Reals [pt3_ref_pt = 0..40534] DIMENSION_LABELS: ref_pt units: meters description: DEM elevation, derived from ATL06 /gtxx/atl06_segments/dem/dem_h long_name: DEM elevation source: ATL06 valid_min: -400.0000000 valid_max: 8400.000000 _FillValue: 3.402823466e+38 origname: dem_h fullnamepath: /pt3/ref_surf/dem_h coordinates: pt3_delta_time pt3_latitude pt3_longitude |
| pt3_ref_surf_e_slope: | Array of 32 bit Reals [pt3_ref_pt = 0..40534] DIMENSION_LABELS: ref_pt units: 1 description: the mean East-component slope for the reference surface within 50 m of the fit center long_name: east-component slope source: derived, ATL11 algorithm _FillValue: 3.402823466e+38 origname: e_slope fullnamepath: /pt3/ref_surf/e_slope coordinates: pt3_delta_time pt3_latitude pt3_longitude |
| pt3_ref_surf_fit_quality: | Array of 16 bit Integers [pt3_ref_pt = 0..40534] DIMENSION_LABELS: ref_pt units: 1 description: Indicates quality of the fit: 0: no problem identified, 1: One or more polynomial coefficients has an error of 10 or larger, 2: One or more surface slope components is greater than 0.02, 3: both 1 and 2 long_name: fit quality summary source: derived, ATL11 algorithm valid_min: 0 valid_max: 3 origname: fit_quality fullnamepath: /pt3/ref_surf/fit_quality coordinates: pt3_delta_time pt3_latitude pt3_longitude |
| pt3_ref_surf_geoid_free2mean: | Array of 32 bit Reals [pt3_ref_pt = 0..40534] DIMENSION_LABELS: ref_pt units: meters description: Additive value to convert geoid heights from the tide-free system to the mean-tide system, derived from ATL06 /gtxx/atl06_segments/dem/geoid_free2mean long_name: Geoid Free-to-Mean conversion source: ATL06 valid_min: -10.00000000 valid_max: 10.00000000 _FillValue: 3.402823466e+38 origname: geoid_free2mean fullnamepath: /pt3/ref_surf/geoid_free2mean coordinates: pt3_delta_time pt3_latitude pt3_longitude |
| pt3_ref_surf_geoid_h: | Array of 32 bit Reals [pt3_ref_pt = 0..40534] DIMENSION_LABELS: ref_pt units: meters description: Geoid height above WGS-84 reference ellipsoid in the tide-free system, derived from ATL06 /gtxx/atl06_segments/dem/geoid_h long_name: Geoid Height source: ATL06 valid_min: -110.0000000 valid_max: 500.0000000 _FillValue: 3.402823466e+38 origname: geoid_h fullnamepath: /pt3/ref_surf/geoid_h coordinates: pt3_delta_time pt3_latitude pt3_longitude |
| pt3_ref_surf_misfit_chi2r: | Array of 32 bit Reals [pt3_ref_pt = 0..40534] units: meters DIMENSION_LABELS: ref_pt description: misfit chi square, divided by the number of degrees in the solution long_name: misfit chi square source: derived, ATL11 algorithm valid_min: 0.000000000 _FillValue: 3.402823466e+38 origname: misfit_chi2r fullnamepath: /pt3/ref_surf/misfit_chi2r coordinates: pt3_delta_time pt3_latitude pt3_longitude |
| pt3_ref_surf_misfit_rms: | Array of 32 bit Reals [pt3_ref_pt = 0..40534] DIMENSION_LABELS: ref_pt units: meters description: RMS misfit for the surface-polynomial fit long_name: misfit RMS source: derived, ATL11 algorithm valid_min: 0.000000000 _FillValue: 3.402823466e+38 origname: misfit_rms fullnamepath: /pt3/ref_surf/misfit_rms coordinates: pt3_delta_time pt3_latitude pt3_longitude |
| pt3_ref_surf_n_slope: | Array of 32 bit Reals [pt3_ref_pt = 0..40534] DIMENSION_LABELS: ref_pt units: 1 description: the mean North-component slope for the reference surface within 50 m of the fit center long_name: north-component slope source: derived, ATL11 algorithm _FillValue: 3.402823466e+38 origname: n_slope fullnamepath: /pt3/ref_surf/n_slope coordinates: pt3_delta_time pt3_latitude pt3_longitude |
| pt3_ref_surf_poly_coeffs: | Array of 32 bit Reals [pt3_ref_pt = 0..40534][pt3_ref_surf_poly_exponent_x = 0..7] units: 1 long_name: polynomial coefficients DIMENSION_LABELS: ref_pt, (poly_exponent_x, poly_exponent_y) description: polynomial coefficients (up to degree 3), for polynomial components scaled by 100 m source: derived, ATL11 algorithm _FillValue: 3.402823466e+38 origname: poly_coeffs fullnamepath: /pt3/ref_surf/poly_coeffs coordinates: pt3_delta_time pt3_latitude pt3_longitude pt3_ref_surf_poly_exponent_x pt3_ref_surf_poly_exponent_y |
| pt3_ref_surf_poly_coeffs_sigma: | Array of 32 bit Reals [pt3_ref_pt = 0..40534][pt3_ref_surf_poly_exponent_x = 0..7] units: 1 description: formal errors for the polynomial coefficients long_name: polynomial coefficients error source: derived, ATL11 algorithm _FillValue: 3.402823466e+38 DIMENSION_LABELS: ref_pt, (poly_exponent_x, poly_exponent_y) origname: poly_coeffs_sigma fullnamepath: /pt3/ref_surf/poly_coeffs_sigma coordinates: pt3_delta_time pt3_latitude pt3_longitude pt3_ref_surf_poly_exponent_x pt3_ref_surf_poly_exponent_y |
| pt3_ref_surf_rgt_azimuth: | Array of 32 bit Reals [pt3_ref_pt = 0..40534] DIMENSION_LABELS: ref_pt units: degrees description: Reference track azimuth, in degrees east of local north long_name: RGT azimuth source: ATL06 valid_min: -180.0000000 valid_max: 180.0000000 _FillValue: 3.402823466e+38 origname: rgt_azimuth fullnamepath: /pt3/ref_surf/rgt_azimuth coordinates: pt3_delta_time pt3_latitude pt3_longitude |
| pt3_ref_surf_x_atc: | Array of 64 bit Reals [pt3_ref_pt = 0..40534] valid_min: 0.0000000000000000 valid_max: 40200000.000000000 _FillValue: 1.7976931348623157e+308 DIMENSION_LABELS: ref_pt units: meters description: Along-track coordinate of the reference point, measured along the RGT from its first equator crossing. long_name: Along track distance source: ATL06 origname: x_atc fullnamepath: /pt3/ref_surf/x_atc coordinates: pt3_delta_time pt3_latitude pt3_longitude |
| pt3_ref_surf_xt_slope: | Array of 32 bit Reals [pt3_ref_pt = 0..40534] DIMENSION_LABELS: ref_pt units: 1 description: Mean cross-track component of the slope of the reference surface within 50 m of the fit center long_name: across-track slope source: derived, ATL11 algorithm _FillValue: 3.402823466e+38 origname: xt_slope fullnamepath: /pt3/ref_surf/xt_slope coordinates: pt3_delta_time pt3_latitude pt3_longitude |
| pt3_ref_surf_y_atc: | Array of 64 bit Reals [pt3_ref_pt = 0..40534] DIMENSION_LABELS: ref_pt units: meters description: Across-track coordinate of the reference point, measured along the RGT from its first equator crossing. long_name: Across track distance source: ATL06 valid_min: -20000.000000000000 valid_max: 20000.000000000000 _FillValue: 1.7976931348623157e+308 origname: y_atc fullnamepath: /pt3/ref_surf/y_atc coordinates: pt3_delta_time pt3_latitude pt3_longitude |
| quality_assessment_qa_granule_fail_reason: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Granule Failure Reason units: 1 source: Operations valid_min: 0 valid_max: 5 contentType: qualityInformation description: Flag indicating granule failure reason. 0=no failure; 1=processing error; 2=Insufficient output data was generated; 3=TBD Failure; 4=TBD_Failure; 5=other failure. flag_meanings: no_failure PROCESS_ERROR INSUFFICIENT_OUTPUT failure_3 failure_4 OTHER_FAILURE flag_values: 0, 1, 2, 3, 4, 5 origname: qa_granule_fail_reason fullnamepath: /quality_assessment/qa_granule_fail_reason |
| quality_assessment_qa_granule_pass_fail: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Granule Pass Flag units: 1 source: Operations valid_min: 0 valid_max: 1 contentType: qualityInformation description: Flag indicating granule quality. 0=granule passes automatic QA. 1=granule fails automatic QA. flag_meanings: PASS FAIL flag_values: 0, 1 origname: qa_granule_pass_fail fullnamepath: /quality_assessment/qa_granule_pass_fail |
| orbit_info_bounding_polygon_dim1: | Array of 32 bit Integers [orbit_info_bounding_polygon_dim1 = 0..26] description: Polygon extent vertex count units: 1 long_name: Polygon vertex count source: model origname: bounding_polygon_dim1 fullnamepath: /orbit_info/bounding_polygon_dim1 |
| pt1_cycle_number: | Array of 16 bit Integers [pt1_cycle_number = 0..25] DIMENSION_LABELS: cycle_number units: counts description: cycle number long_name: cycle number source: ATL06 valid_min: 1 valid_max: 99 origname: cycle_number fullnamepath: /pt1/cycle_number |
| pt1_ref_pt: | Array of 32 bit Integers [pt1_ref_pt = 0..40569] DIMENSION_LABELS: ref_pt units: counts description: The reference point is the segment_id corresponding to the center of the ATL06 data used for each ATL11 point. Segment_id is counted from the equator crossing of the RGT, with one segment every 20m. long_name: reference point number source: ATL06 coordinates: delta_time latitude longitude valid_min: 0 valid_max: 2000000 origname: ref_pt fullnamepath: /pt1/ref_pt |
| pt1_ref_surf_poly_exponent_x: | Array of 16 bit Integers [pt1_ref_surf_poly_exponent_x = 0..7] DIMENSION_LABELS: poly_exponent_x units: counts description: exponents for the x factors in the surface polynomial long_name: polynomial x exponents source: derived, ATL11 algorithm valid_min: 0 valid_max: 3 origname: poly_exponent_x fullnamepath: /pt1/ref_surf/poly_exponent_x |
| pt1_ref_surf_poly_exponent_y: | Array of 16 bit Integers [pt1_ref_surf_poly_exponent_y = 0..7] DIMENSION_LABELS: poly_exponent_y units: counts description: exponents for the y factors in the surface polynomial long_name: polynomial y exponents source: derived, ATL11 algorithm valid_min: 0 valid_max: 3 origname: poly_exponent_y fullnamepath: /pt1/ref_surf/poly_exponent_y |
| pt2_cycle_number: | Array of 16 bit Integers [pt2_cycle_number = 0..25] DIMENSION_LABELS: cycle_number units: counts description: cycle number long_name: cycle number source: ATL06 valid_min: 1 valid_max: 99 origname: cycle_number fullnamepath: /pt2/cycle_number |
| pt2_ref_pt: | Array of 32 bit Integers [pt2_ref_pt = 0..40557] DIMENSION_LABELS: ref_pt units: counts description: The reference point is the segment_id corresponding to the center of the ATL06 data used for each ATL11 point. Segment_id is counted from the equator crossing of the RGT, with one segment every 20m. long_name: reference point number source: ATL06 coordinates: delta_time latitude longitude valid_min: 0 valid_max: 2000000 origname: ref_pt fullnamepath: /pt2/ref_pt |
| pt2_ref_surf_poly_exponent_x: | Array of 16 bit Integers [pt2_ref_surf_poly_exponent_x = 0..7] DIMENSION_LABELS: poly_exponent_x units: counts description: exponents for the x factors in the surface polynomial long_name: polynomial x exponents source: derived, ATL11 algorithm valid_min: 0 valid_max: 3 origname: poly_exponent_x fullnamepath: /pt2/ref_surf/poly_exponent_x |
| pt2_ref_surf_poly_exponent_y: | Array of 16 bit Integers [pt2_ref_surf_poly_exponent_y = 0..7] DIMENSION_LABELS: poly_exponent_y units: counts description: exponents for the y factors in the surface polynomial long_name: polynomial y exponents source: derived, ATL11 algorithm valid_min: 0 valid_max: 3 origname: poly_exponent_y fullnamepath: /pt2/ref_surf/poly_exponent_y |
| pt3_cycle_number: | Array of 16 bit Integers [pt3_cycle_number = 0..25] DIMENSION_LABELS: cycle_number units: counts description: cycle number long_name: cycle number source: ATL06 valid_min: 1 valid_max: 99 origname: cycle_number fullnamepath: /pt3/cycle_number |
| pt3_ref_pt: | Array of 32 bit Integers [pt3_ref_pt = 0..40534] DIMENSION_LABELS: ref_pt units: counts description: The reference point is the segment_id corresponding to the center of the ATL06 data used for each ATL11 point. Segment_id is counted from the equator crossing of the RGT, with one segment every 20m. long_name: reference point number source: ATL06 coordinates: delta_time latitude longitude valid_min: 0 valid_max: 2000000 origname: ref_pt fullnamepath: /pt3/ref_pt |
| pt3_ref_surf_poly_exponent_x: | Array of 16 bit Integers [pt3_ref_surf_poly_exponent_x = 0..7] DIMENSION_LABELS: poly_exponent_x units: counts description: exponents for the x factors in the surface polynomial long_name: polynomial x exponents source: derived, ATL11 algorithm valid_min: 0 valid_max: 3 origname: poly_exponent_x fullnamepath: /pt3/ref_surf/poly_exponent_x |
| pt3_ref_surf_poly_exponent_y: | Array of 16 bit Integers [pt3_ref_surf_poly_exponent_y = 0..7] DIMENSION_LABELS: poly_exponent_y units: counts description: exponents for the y factors in the surface polynomial long_name: polynomial y exponents source: derived, ATL11 algorithm valid_min: 0 valid_max: 3 origname: poly_exponent_y fullnamepath: /pt3/ref_surf/poly_exponent_y |
| FakeDim0: | Array of 32 bit Integers [FakeDim0 = 0..0] units: level |