2026-07-28T15:32:32Zhttp://nsidc.org/api/dataset/metadata/oai

oai:nsidc.org/ATL07.0052026-04-07T16:16:38Zcumulusecsretirednasa_nsidc_daac

ATL07.005ATLAS/ICESat-2 L3A Sea Ice HeightKwok, R., Petty, A. A., Cunningham, G., Markus, T., Hancock, D., Ivanoff, A., Wimert, J., Bagnardi, M., Kurtz, N. & the ICESat-2 Science TeamATLAS/ICESat-2 L3A Sea Ice Height2021-11-29Boulder, Colorado USANASA NSIDC DAAC: NASA National Snow and Ice Data Center Distributed Active Archive Center5false10.5067/ATLAS/ATL07.005https://nsidc.org/sites/default/files/atl07-v005-userguide_1_0.pdfATL07Technical ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-61991-303-492-2468

CIRES, 449 UCB

University of Colorado

BoulderCO80309-0449USAEARTH SCIENCECRYOSPHERESEA ICESEA ICE ELEVATION Climatology/Meteorology/Atmosphereicesat2-projectATLASAdvanced Topographic Laser Altimeter SystemICESat-2Ice, Cloud, and land Elevation Satellite-22018-10-142022-10-12deprecated-9090-180180GEOGRAPHIC REGIONNORTHERN HEMISPHEREGEOGRAPHIC REGIONSOUTHERN HEMISPHEREVaries91 dayThese data have been retired and are no longer accessible, though a more recent version of these data may be available.These data have been retired and are no longer available for use, though a more recent version of these data may be available. Cite any prior or planned use of these data according to the recommended citation at https://nsidc.org/about/data-use-and-copyright. For more information on the NASA EOSDIS Data Use Policy, see https://earthdata.nasa.gov/earth-observation-data/data-use-policy.EnglishNASA/GSFC/SED/ESD/I2-SIPSNASA NSIDC DAACNASA National Snow and Ice Data Center Distributed Active Archive Centerhttps://nsidc.org/daacData Center ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-6199

National Snow and Ice Data Center

CIRES, 449 UCB

University of Colorado

BoulderCO80309-0449USAHTTPSHDF5

The data set (ATL07) contains along-track heights for sea ice and open water leads (at varying length scales) relative to the WGS84 ellipsoid (ITRF2014 reference frame) after adjustment for geoidal and tidal variations, and inverted barometer effects. Height statistics and apparent reflectance are also provided. The data were acquired by the Advanced Topographic Laser Altimeter System (ATLAS) instrument on board the Ice, Cloud and land Elevation Satellite-2 (ICESat-2) observatory.

VIEW RELATED INFORMATIONhttps://nsidc.org/sites/default/files/atl07-v005-userguide_1_0.pdfATLAS/ICESat-2 L3A Sea Ice Height, Version 5 User GuideCEOS IDN DIFVERSION 9.92021-11-292026-04-07NSIDCVersion SummaryChanges for this version include: <ul> <li>The ATL07 QA check (atl07_qa_mod) for insufficient output failure has been updated to only check for valid sea ice segments. Previously, total number of sea ice segments written (valid and invalid) were counted.</li> <li>The description of height_segment_confidence was updated so that it agrees with the coded procedure.</li> <li>A max_incidence_angle filter was implemented and added as a controllable override. If the beam incidence angle exceeds max_incidence_angle, the surface type will be set to -1.</li> <li>A contrast filter has been implemented, but turned off by default. Two new controllable parameters have been added.</li> <li>The podppd flag has been added to the ATL07 product and is used to filter heights and segment surface type.</li> <li>A new parameter height_segment_n_pulse_seg_used has been added to the ATL07 product. This parameter excludes the number of specular returns filtered out of processing, unlike height_segment_n_pulse_seg.</li> <li>The description of photon_rate has been updated so that it is clear how the parameter is computed.</li> <li>Modified the integration test scripts to generate browse products and check for the presence of default1 and default2 plots.</li> <li>Updated the ANC31 sea ice concentration interface to read either v1 or v2 of the sea ice concentration files.</li> <li>New parameters of mean ocean sea level pressure and dynamic inverted barometer effect are calculated in ATL07. These are not currently applied to the heights but could be in future releases. The new parameters are: /ancillary_data/sea_ice /mean_ocean_slp: Mean ocean sea level pressure computed in ATL07 and /gtx/sea_ice_segments/geophysical/height_segment_dynib: Dynamic inverted barometer.</li> </ul>NSIDCMinor VersionNSIDCSpatial Reference SystemsEPSG:4326WGS 84NSIDCLevel of ServiceNo Data AccessNSIDCFull Dataset CitationKwok, R., Petty, A. A., Cunningham, G., Markus, T., Hancock, D., Ivanoff, A., Wimert, J., Bagnardi, M., Kurtz, N. & the ICESat-2 Science Team. (2021). <i>ATLAS/ICESat-2 L3A Sea Ice Height</i>. (ATL07, Version 5). [Data Set]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. <a href="https://doi.org/10.5067/ATLAS/ATL07.005">https://doi.org/10.5067/ATLAS/ATL07.005</a>. [<i><describe subset used if applicable></i>].NSIDCRetiredtrue