2026-10-13T06:52:34Zhttp://nsidc.org/api/dataset/metadata/oaioai:nsidc.org/NSIDC-0799.0012026-08-27T17:16:35Zcumulusretirednasa_nsidc_daac
NSIDC-0799.001SMOS-Based SMAP L2 Radiometer Half-Orbit 9 km EASE-Grid Soil MoistureChaubell, J., Bindlish, R., Hayashi, A., Colliander, A., Yueh, S., Dunbar, S. & Entekhabi, D.SMOS-Based SMAP L2 Radiometer Half-Orbit 9 km EASE-Grid Soil Moisture2025-02-17Boulder, Colorado USANSIDC: National Snow and Ice Data Center1false10.5067/GXBB46ZD0CLEhttps://nsidc.org/sites/default/files/documents/user-guide/multi_nsidc-0800-v001-userguide_0.pdfNSIDC-0799Technical ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-61991-303-492-2468CIRES, 449 UCBUniversity of ColoradoBoulderCO80309-0449USAEARTH SCIENCESPECTRAL/ENGINEERINGMICROWAVEBRIGHTNESS TEMPERATURE EARTH SCIENCELAND SURFACESOILSSOIL MOISTURE/WATER CONTENTSURFACE SOIL MOISTURE EARTH SCIENCEBIOSPHEREVEGETATIONVEGETATION OPTICAL DEPTH Climatology/Meteorology/AtmosphereSMAP-related projectSMAP L-BAND RADIOMETERSMAP L-Band RadiometerSMOS L-BAND RADIOMETERSMOS L-Band RadiometerSMAPSoil Moisture Active and Passive ObservatorySMOSSoil Moisture and Ocean Salinity (Earth Explorer Opportunity Mission)2015-05-012022-01-01deprecated-9090-180180GEOGRAPHIC REGIONGLOBAL9 km9 km45 minuteThese 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/JPLNASA NSIDC DAACNASA National Snow and Ice Data Center Distributed Active Archive Centerhttps://nsidc.org/daacData Center ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-6199National Snow and Ice Data CenterCIRES, 449 UCBUniversity of ColoradoBoulderCO80309-0449USAHTTPSHDF5The Soil Moisture Active Passive (SMAP, launched in 2015) and the Soil Moisture and Ocean Salinity (SMOS, launched in 2009) missions are each L-band satellites that provide brightness temperature and soil moisture estimates and vegetation optical depth approximately every 2-3 days with a spatial resolution of ~40 km. By integrating brightness temperature observations from both satellites, these data products reduce the revisit time to about one day, improving the ability to monitor fast-response processes such as groundwater drainage and recharge, early dry-down after storms, and pre-storm soil moisture conditions for runoff determination. The Integrated SMAP and SMOS Soil Moisture Data is available in two products.
The SMOS-Based SMAP L2 Radiometer Half-Orbit 9 km EASE-Grid Soil Moisture (NSIDC-0799) product is generated by processing half-orbit granules (either 6 AM ascending or 6 PM descending) from the pre-processed SMOS product. The L2 product consists solely of SMOS-based data, incorporating information after SMOS brightness temperatures (TBs) at a 40° incidence angle were inter-calibrated and the soil moisture (SM) and vegetation optical depth (VOD) were retrieved using the SMAP Dual Channel Algorithm (DCA).
The SMAP/SMOS L3 Radiometer 9 km EASE-Grid Soil Moisture (NSIDC-0800) product is generated by the processing software ingesting one day’s worth of granules from both the SMAP SPL2SMP_E product and the SMOS-derived L2 data. The L3 product contains both SMAP and SMOS descending (6:00 AM/PM) and ascending (6:00 PM/AM) data stored in separate arrays.VIEW RELATED INFORMATIONhttps://nsidc.org/sites/default/files/documents/user-guide/multi_nsidc-0800-v001-userguide_0.pdfSMOS-Based SMAP L2 Radiometer Half-Orbit 9 km EASE-Grid Soil Moisture, Version 1 User GuideCEOS IDN DIFVERSION 9.92025-02-172026-08-27NSIDCVersion SummaryInitial releaseNSIDCMinor VersionNSIDCSpatial Reference SystemsEPSG:6933WGS 84 / NSIDC EASE-Grid 2.0 GlobalNSIDCLevel of ServiceNo Data AccessNSIDCFull Dataset CitationChaubell, J., Bindlish, R., Hayashi, A., Colliander, A., Yueh, S., Dunbar, S. & Entekhabi, D. (2025). <i>SMOS-Based SMAP L2 Radiometer Half-Orbit 9 km EASE-Grid Soil Moisture</i>. (NSIDC-0799, Version 1). [Data Set]. Boulder, Colorado USA. National Snow and Ice Data Center. <a href="https://doi.org/10.5067/GXBB46ZD0CLE">https://doi.org/10.5067/GXBB46ZD0CLE</a>. [<i><describe subset used if applicable></i>].NSIDCRetiredtrue