2026-04-17T10:23:44Zhttp://nsidc.org/api/dataset/metadata/oaioai:nsidc.org/SPL3SMP.0012026-03-30T20:16:37Zcumulusretirednasa_nsidc_daac
SPL3SMP.001SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil MoistureO'Neill, P. E., Chan, S., Njoku, E. G., Jackson, T. & Bindlish, R.SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture2015-09-14Boulder, Colorado USANASA NSIDC DAAC: NASA National Snow and Ice Data Center Distributed Active Archive Center1false10.5067/HF1KOE0Q85V7https://doi.org/10.5067/HF1KOE0Q85V7SPL3SMPTechnical ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-61991-303-492-2468CIRES, 449 UCBUniversity of ColoradoBoulderCO80309-0449USAEARTH SCIENCETERRESTRIAL HYDROSPHERESNOW/ICEALBEDO EARTH SCIENCESPECTRAL/ENGINEERINGMICROWAVEBRIGHTNESS TEMPERATURE EARTH SCIENCELAND SURFACETOPOGRAPHYSURFACE ROUGHNESS EARTH SCIENCELAND SURFACESOILSSOIL MOISTURE/WATER CONTENTSURFACE SOIL MOISTURE EARTH SCIENCEBIOSPHEREVEGETATIONPLANT CHARACTERISTICSVEGETATION WATER CONTENT Climatology/Meteorology/AtmosphereGeoscientific InformationSMAP-projectSoil MoistureSoil Moisture Active PassiveSMAP L-BAND RADARSMAP L-Band RadarSMAPSoil Moisture Active and Passive Observatory2015-09-102015-10-24deprecated-85.04485.044-180180GEOGRAPHIC REGIONGLOBAL LAND36 km36 km1 dayVersion 1 Beta data employ preliminary algorithms that are still being validated and are thus subject to uncertainties.These 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/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 ColoradoBoulderCO80309-0449USAFTP10.24 per granule MBHDF5Brodzik, M. J., B. Billingsley, T. Haran, B. Raup, and M. H. Savoie. 2014. Correction: Brodzik, M. J. et al. EASE-Grid 2.0: Incremental but Significant Improvements for Earth-Gridded Data Sets. ISPRS Int. J. Geo-Inf 2012. 1(1):32-45 ISPRS Int. J. Geo-Inf. 3(3):1154-1156. http://dx.doi.org/10.3390/ijgi3031154.
Brodzik, M. J., B. Billingsley, T. Haran, B. Raup, and M. H. Savoie. 2012. EASE-Grid 2.0: Incremental but Significant Improvements for Earth-Gridded Data Sets. ISPRS Int. J. Geo-Inf. 1(1):32-45. http://dx.doi.org/10.3390/ijgi1010032.
Chan, Steven, and R. Scott Dunbar. 2015. Soil Moisture Active Passive (SMAP) Level 3 Passive Soil Moisture Product Specification Document, Beta Release. Pasadena, CA USA: SMAP Project, JPL D-72551, Jet Propulsion Laboratory. (http://nsidc.org/data/docs/daac/smap/sp_l3_smp/pdfs/SMAP L3_SM_P Beta-Level PSD (PRIMARY).pdf, 464 KB)
Entekhabi, Dara et al. 2014. SMAP Handbook–Soil Moisture Active Passive: Mapping Soil Moisture and Freeze/Thaw from Space. SMAP Project, JPL CL#14-2285, Jet Propulsion Laboratory, Pasadena, CA.(https://smap.jpl.nasa.gov/files/smap2/SMAP_Handbook_FINAL_1_JULY_2014_Web.pdf, 4.1 MB)
Jackson, T., P. O'Neill, E. Njoku, S., Chan, R. Bindlish, A. Colliander, F. Chen, M. Burgin, S. Dunbar, J. Piepmeier, M. Cosh, T. Caldwell, J. Walker, X. Wu, A. Berg, T. Rowlandson, A. Pacheco, H. McNairn, M. Thibeault, J. Martínez-Fernández, Á. González-Zamora, M. Seyfried, D. Bosch, P. Starks, D. Goodrich, J. Prueger, M. Palecki, E. Small, M. Zreda, J. Calvet, W. Crow, Y. Kerr, S. Yueh, and D. Entekhabi. 2015. Calibration and Validation for the L2/3_SM_P Beta-Release Data Products, Version 2. SMAP Project, JPL D - 93981. Jet Propulsion Laboratory, Pasadena, CA. (http://nsidc.org/data/docs/daac/smap/sp_l2_smp/pdfs/SMAP L2_SM_P Beta-Level Assessment Report FINAL.pdf, 3 MB)
Jet Propulsion Laboratory (JPL). "SMAP Instrument." JPL SMAP Soil Moisture Active Passive. http://smap.jpl.nasa.gov/observatory/instrument/ [20 August 2015].
NASA EOSDIS Land Processes DAAC. 2015. Land Water Mask Derived from MODIS and SRTM L3 Global 250m SIN Grid. Version 005. NASA EOSDIS Land Processes DAAC, USGS Earth Resources Observation and Science (EROS) Center, Sioux Falls, SD. (https://lpdaac.usgs.gov/dataset_discovery/modis/modis_products_table/mod44w), [20 August 2015].
O'Neill, P. E., E. G. Njoku, T. J. Jackson, S. Chan, and R. Bindlish. 2015. SMAP Algorithm Theoretical Basis Document: Level 2 & 3 Soil Moisture (Passive) Data Products. SMAP Project, JPL D-66480, Jet Propulsion Laboratory, Pasadena, CA. (https://nsidc.org/data/docs/daac/smap/sp_l2_smp/pdfs/L2_SM_P_ATBD_v7_Sep2015-po-en.pdf. 3.3 MB)
Owe, M., De Jeu, R. A. M., and Walker, J. P. A Methodology for Surface Soil Moisture and Vegetation Optical Depth Retrieval Using the Microwave Polarization Difference Index. IEEE Transactions on Geoscience and Remote Sensing, 39(8): 1643–1654, 2001.
Piepmeier, J.R., D.G. Long, and E.G. Njoku. 2008. Stokes Antenna Temperatures. IEEE Trans. Geosci. Remote Sens. 46(2):516-527.This 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. Ancillary data include soil temperature, vegetation water content, and vegetation opacity and albedo. Input SMAP L-band brightness temperatures are resampled to a global, cylindrical 36 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0). Note: These data are beta release quality, meaning that they have not undergone full validation and may still contain significant errors. In addition, the data field that indicates retrieval quality, called retrieval qual flag, was found to contain incorrect information. Users are advised to ignore this data field in Version 1 of this product.VIEW RELATED INFORMATIONhttps://doi.org/10.5067/HF1KOE0Q85V7User's GuideVIEW RELATED INFORMATIONhttp://nsidc.org/data/smap/index.htmlSMAP Data at NASA NSIDC DAACVIEW RELATED INFORMATIONhttp://nsidc.org/data/smap/validation/val-data.htmlSMAP Validation Data at NASA NSIDC DAACPROJECT HOME PAGEhttp://smap.jpl.nasa.gov/SMAP Web Site at the Jet Propulsion LaboratoryVIEW RELATED INFORMATIONhttps://www.asf.alaska.edu/smap/SMAP Data at NASA ASF DAACVIEW RELATED INFORMATIONhttps://nsidc.org/data/docs/daac/smap/sp_l2_smp/pdfs/L2_SM_P_ATBD_v7_Sep2015-po-en.pdfAlgorithm Theoretical Basis Document (ATBD)CEOS IDN DIFVERSION 9.92015-09-142026-03-30NSIDCVersion SummaryFirst public data releaseNSIDCMinor VersionR11920First public data release2015-09-102015-10-241NSIDCLevel of ServiceNo Data AccessNSIDCFull Dataset CitationO'Neill, P. E., Chan, S., Njoku, E. G., Jackson, T. & Bindlish, R. (2015). <i>SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture</i>. (SPL3SMP, Version 1). [Data Set]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. <a href="https://doi.org/10.5067/HF1KOE0Q85V7">https://doi.org/10.5067/HF1KOE0Q85V7</a>. [<i><describe subset used if applicable></i>].NSIDCRetiredtrue