2026-08-25T17:48:59Zhttp://nsidc.org/api/dataset/metadata/oaioai:nsidc.org/SPL3SMP.0082026-08-19T22:16:45Zcumulusecsretirednasa_nsidc_daac
SPL3SMP.008SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil MoistureO'Neill, P. E., Chan, S., Njoku, E. G., Jackson, T., Bindlish, R. & Chaubell, J.SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture2021-11-02Boulder, Colorado USANASA NSIDC DAAC: NASA National Snow and Ice Data Center Distributed Active Archive Center8false10.5067/OMHVSRGFX38Ohttps://nsidc.org/sites/default/files/spl3smp-v008-userguide.pdfSPL3SMPTechnical 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 Climatology/Meteorology/AtmosphereGeoscientific InformationEASE-Grid SM-projectSMAP-projectSMAP-project-L3SMAP L-BAND RADIOMETERSMAP L-Band RadiometerSMAPSoil Moisture Active and Passive Observatory2015-03-312023-12-02deprecated-85.04485.044-180180GEOGRAPHIC REGIONGLOBAL LAND36 km36 km1 daySMAP products provide multiple means to assess quality. Each product contains bit flags, uncertainty measures, and file-level metadata that provide quality information. For information regarding the specific bit flags, uncertainty measures, and file-level metadata contained in this product, refer to the Data Fields and Metadata Fields documents.
Each HDF5 file contains metadata with Quality Assessment (QA) metadata flags that are set by the Science Data Processing System (SDS) at the JPL prior to delivery to NSIDC. A separate metadata file with an .xml file extension is also delivered to NSIDC with the HDF5 file; it contains the same information as the file-level metadata.
A separate QA file with a .qa file extension is also associated with each data file. QA files are ASCII text files that contain statistical information in order to help users better assess the quality of the associated data file.
If a product does not fail QA, it is ready to be used for higher-level processing, browse generation, active science QA, archive, and distribution. If a product fails QA, it is never delivered to NSIDC DAAC.These data have been retired and are no longer accessible. However, a more recent version may be available.These data have been retired and are no longer accessible. However, a more recent version of 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/JPL/SMAPNASA 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 ColoradoBoulderCO80309-0449USAHTTPSHDF5This Level-3 (L3) soil moisture product provides a composite of daily estimates of global land surface conditions retrieved by the Soil Moisture Active Passive (SMAP) passive microwave radiometer. SMAP L-band soil moisture data are resampled to a global, cylindrical 36 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0).VIEW RELATED INFORMATIONhttps://nsidc.org/sites/default/files/spl3smp-v008-userguide.pdfSMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture, Version 8 User GuideCEOS IDN DIFVERSION 9.92021-11-022026-08-19NSIDCVersion SummaryChanges to this version include:
- Dual Channel Algorithm (DCA) replaces Single Channel Algorithm – Vertical (SCA-V) as baseline algorithm
- Bulk_density maximum value changed from 1 to 2.65NSIDCMinor VersionNSIDCSpatial Reference SystemsEPSG:6933WGS 84 / NSIDC EASE-Grid 2.0 GlobalNSIDCLevel of ServiceNo Data AccessNSIDCFull Dataset CitationO'Neill, P. E., Chan, S., Njoku, E. G., Jackson, T., Bindlish, R. & Chaubell, J. (2021). <i>SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture</i>. (SPL3SMP, Version 8). [Data Set]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. <a href="https://doi.org/10.5067/OMHVSRGFX38O">https://doi.org/10.5067/OMHVSRGFX38O</a>. [<i><describe subset used if applicable></i>].NSIDCRetiredtrue