2026-09-24T18:35:49Zhttp://nsidc.org/api/dataset/metadata/oai

oai:nsidc.org/ATL12.0032026-04-06T19:16:38Zcumulusretirednasa_nsidc_daac

ATL12.003ATLAS/ICESat-2 L3A Ocean Surface HeightMorison, J. H., Hancock, D., Dickinson, S., Robbins, J., Roberts, L., Kwok, R., Palm, S. P., Smith, B., Jasinski, M. F. & the ICESat-2 Science TeamATLAS/ICESat-2 L3A Ocean Surface Height2020-05-05Boulder, Colorado USANASA NSIDC DAAC: NASA National Snow and Ice Data Center Distributed Active Archive Center3false10.5067/ATLAS/ATL12.003https://nsidc.org/sites/default/files/atl12-v003-userguide_1.pdfATL12Technical ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-61991-303-492-2468

CIRES, 449 UCB

University of Colorado

BoulderCO80309-0449USAEARTH SCIENCEOCEANSSEA SURFACE TOPOGRAPHYSEA SURFACE HEIGHT Climatology/Meteorology/Atmosphereicesat2-projectATLASAdvanced Topographic Laser Altimeter SystemICESat-2Ice, Cloud, and land Elevation Satellite-22018-10-132020-11-11deprecated-9090-180180GEOGRAPHIC REGIONGLOBAL OCEANVaries91 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 ESDIS Data Use Guidance, see https://www.earthdata.nasa.gov/engage/open-data-services-software-policies/data-use-guidance.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

This data set (ATL12) contains along-track sea surface heights at variable length scales over cloud-free regions. Estimates of height distributions, surface roughness, surface slope, 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/atl12-v003-userguide_1.pdfATLAS/ICESat-2 L3A Ocean Surface Height, Version 3 User GuideCEOS IDN DIFVERSION 9.92020-05-052026-04-06NSIDCVersion SummaryThe parameters gt[x]/ssh_segments/heights/xbind, gt[x]/ssh_segments/heights/htybin, gt[x]/ssh_segments/heights/xrbin, and ds_xbin were added to the product to report 10 m bin average heights and averaged photon rate information output by the sea state bias calculation; The ocean histograms were updated to have a center bin with a zero height; New scatter plots were added to the browse images to better visualize the data. Previous browse images for heights and ground tracks are now separated by orbit; The width of the received histogram as determined in fine_sel is now used to create the y histogram in rm_uncertainty, which is then used in char_rss to create simulated photons that are used in fit2g to determine a two Gaussian fit; The moments of Y are now calculated as described in the ATBD for ATL12; The h_kurtosis calculation has been corrected to match the description in the ATBD for ATL12; The length_seg parameter is now calculated as the difference of the along-track x of the first and last signal photons in the ocean segment; A new formula for calculating the 10-m bin average photon rate was implemented.NSIDCMinor VersionNSIDCSpatial Reference SystemsEPSG:4326WGS 84NSIDCLevel of ServiceNo Data AccessNSIDCFull Dataset CitationMorison, J. H., Hancock, D., Dickinson, S., Robbins, J., Roberts, L., Kwok, R., Palm, S. P., Smith, B., Jasinski, M. F. & the ICESat-2 Science Team. (2020). <i>ATLAS/ICESat-2 L3A Ocean Surface Height</i>. (ATL12, Version 3). [Data Set]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. <a href="https://doi.org/10.5067/ATLAS/ATL12.003">https://doi.org/10.5067/ATLAS/ATL12.003</a>. [<i><describe subset used if applicable></i>].NSIDCRetiredtrue