2026-07-12T02:57:07Zhttp://nsidc.org/api/dataset/metadata/oai
oai:nsidc.org/SPL3SMP_E.0032026-06-24T19:16:46Zcumulusecsretirednasa_nsidc_daac
SPL3SMP_E.003SMAP Enhanced L3 Radiometer Global Daily 9 km EASE-Grid Soil MoistureO'Neill, P. E., Chan, S., Njoku, E. G., Jackson, T., Bindlish, R. & Chaubell, J.SMAP Enhanced L3 Radiometer Global Daily 9 km EASE-Grid Soil Moisture2019-08-15Boulder, Colorado USANASA NSIDC DAAC: NASA National Snow and Ice Data Center Distributed Active Archive Center3false10.5067/T90W6VRLCBHIhttps://nsidc.org/sites/default/files/spl3smp_e-v003-userguide.pdfSPL3SMP_ETechnical ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-61991-303-492-2468
CIRES, 449 UCB
University of Colorado
BoulderCO80309-0449USAEARTH 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 Observatory2015-03-312020-08-27deprecated-85.04485.044-180180GEOGRAPHIC REGIONGLOBAL LAND9 km9 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.As a condition of using these data, you must cite the use of this data set using the recommended citation. For more information, see the Use and Copyright page at https://nsidc.org/about/use_copyright.html.These data are offered free of charge. You may use these data freely, provided that you cite NSIDC DAAC as the source, and provide an acknowledgment in any published papers.EnglishNASA/JPL/SMAPNASA NSIDC DAACNASA National Snow and Ice Data Center Distributed Active Archive Centerhttps://nsidc.org/daacData Center ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-6199
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
BoulderCO80309-0449USAHTTPSHDF5This enhanced 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) radiometer. This product is a daily composite of SMAP Level-2 (L2) soil moisture which is derived from SMAP Level-1C (L1C) interpolated brightness temperatures. Backus-Gilbert optimal interpolation techniques are used to extract information from SMAP antenna temperatures and convert them to brightness temperatures, which are posted to the 9 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0) in a global cylindrical projection.VIEW RELATED INFORMATIONhttps://nsidc.org/sites/default/files/spl3smp_e-v003-userguide.pdfSMAP Enhanced L3 Radiometer Global Daily 9 km EASE-Grid Soil Moisture, Version 3 User GuideGET DATAhttps://nsidc.org/data/data-access-tool/SPL3SMP_E/versions/3/Data Access ToolCEOS IDN DIFVERSION 9.92019-08-152026-06-24NSIDCVersion Summary<p>Changes to this version include:</p> <ul> <li>As part of the algorithm changes, the following data fields were added: bulk_density, clay_fraction. </li> <li>The baseline algorithm (SCA-V) remains unchanged. </li> <li>Improved aggregation of values in input ancillary data, e.g. roughness, soil texture, NDVI. The fix has negligible impacts on retrievals estimated to be of recommended quality. </li> </ul> For the full major and minor version history, go to <a href="https://nsidc.org/data/smap/version-history">https://nsidc.org/data/smap/version-history</a>NSIDCMinor VersionR16510<ul>Changed with Version 6 update. Changes include: <li>The following data fields were added: bulk_density, clay_fraction, bulk_density_pm, clay_fraction_pm. </li> <li>The baseline algorithm (SCA-V) remains unchanged. </li> <li>Improved aggregation of values in input ancillary data, e.g. roughness, soil texture, NDVI. The fix has negligible impacts on retrievals estimated to be of recommended quality. </li> </ul>2015-03-312019-12-211R16515No science change. CRID incremented to coincide with an update to the radiometer reflector ancillary file for January through December 2020. End date of 27-Marchy-20202019-12-212020-03-272NSIDCSpatial 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. (2019). <i>SMAP Enhanced L3 Radiometer Global Daily 9 km EASE-Grid Soil Moisture</i>. (SPL3SMP_E, 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/T90W6VRLCBHI">https://doi.org/10.5067/T90W6VRLCBHI</a>. [<i><describe subset used if applicable></i>].NSIDCRetiredtrueNSIDCRelated Toolsapplication/vnd.nasa.cmr.umm+jsonfalsefritzdimmt_tool_50907TL3010466318-NSIDC_CPRDNSIDC_CPRD5tool2026-06-24T18:30:53.034Zhttps://zenodo.org/badge/latestdoi/399867529DOWNLOAD SOFTWAREhttps://earthaccess.readthedocs.io/en/stable/DistributionURLNSIDC_CPRD_EARTHACCESSDownloadable Tool0.18.0earthaccessearthaccess is a python library to search and access NASA Earth science data with just a few lines of code.https://github.com/earthaccess-dev/earthaccessVIEW RELATED INFORMATIONGitHub RepositoryPublicationURLDATA ACCESS/RETRIEVALDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESDATA SEARCHDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESPUBLISHERNSIDC DAAC User ServicesEmailnsidc@nsidc.orgPUBLISHERNASA National Snow and Ice Data Center Distributed Active Archive Centerhttps://nsidc.org/daac/NASA NSIDC DAACPUBLISHERNational Snow and Ice Data Centerhttp://nsidc.orgNSIDCDEVELOPERAlaska Satellite Facilityhttps://www.asf.alaska.edu/ASFDEVELOPERInstitute for the Study of Earth, Oceans, and Space, University of New Hampshirehttp://www.eos.unh.edu/UNH/EOSDEVELOPERAtmospheric Science Data Center, Science Directorate, Langley Research Center, NASAhttps://asdc.larc.nasa.gov/NASA/LARC/SD/ASDCMIT License Copyright (c) 2021 Luis Lopez Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.2026-05-12T00:00:00.000ZAs a condition of use, we request that you properly cite the earthaccess library to acknowledge the creators. Formal citations also make it easier for us to track the use and impact of our data and tools, and helps us report data distribution activity and tool usage metrics to funding agencies. If you have used earthaccess in your research, please cite as: Barrett, A., Battisto, C., Bourbeau, J., Fisher, M., Kaufman, D., Kennedy, J., Lopez, L., Lowndes, J., Scheick, J., & Steiker, A. (2024). earthaccess (Version 0.9.0) [Computer software]. https://doi.org/10.5281/zenodo.8365009 See https://github.com/nsidc/earthaccess/releases for more information on the latest version.https://cdn.earthdata.nasa.gov/umm/tool/v1.0UMM-T1.0Python3.8 or higherhttps://earthaccess.readthedocs.io/en/stable/application/vnd.nasa.cmr.umm+jsonfalsecrumlydmmt_tool_12821TL4019517520-NSIDC_CPRDNSIDC_CPRD1tool2026-02-11T17:45:02.724ZGOTO WEB TOOLhttps://search.earthdata.nasa.gov/searchDistributionURLNSIDC_CPRD_NASA_Earthdata_SearchWeb User Interface1NASA Earthdata SearchSearch and order data from all NASA DAACs using spatial and temporal filters in a map interface. Reformatting, reprojecting, and subsetting options are available for some data sets.https://nsidc.org/support/how/search-order-and-customize-nsidc-daac-data-nasa-earthdata-searchVIEW RELATED INFORMATIONHow to search, order, and customize data with NASA Earthdata SearchPublicationURLDATA VISUALIZATIONDATA ANALYSIS AND VISUALIZATIONEARTH SCIENCE SERVICESDATA SEARCHDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESDATA ACCESS/RETRIEVALDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESSERVICE PROVIDERNSIDC DAAC User ServicesEmailnsidc@nsidc.orgSERVICE PROVIDEREarthdata Service DeskEmailsupport@earthdata.nasa.govAUTHORDEVELOPERORIGINATORPUBLISHERMaintenance and Development, Earth Observing System Data and Information System, Earth Observing System,Goddard Space Flight Center, NASAhttp://newsroom.gsfc.nasa.gov/NASA/GSFC/EOS/EOSDIS/EMDChromeFirefoxSafariThis is the most current release of this tool.https://cdn.earthdata.nasa.gov/umm/tool/v1.0UMM-T1.0https://search.earthdata.nasa.gov/search