2026-05-23T13:14:22Zhttp://nsidc.org/api/dataset/metadata/oaioai:nsidc.org/NSIDC-0795.0012026-02-17T20:03:19Zv0_daacv0_allnasa_nsidc_daac
NSIDC-0795.001SMAP L1B Polarimetric GNSS ReflectometryRodriguez-Alvarez, N., Munoz-Martin, J. F., Bosch-Lluis, X. & Oudrhiri, K.SMAP L1B Polarimetric GNSS Reflectometry2024-09-12Boulder, Colorado USANASA NSIDC DAAC: NASA National Snow and Ice Data Center Distributed Active Archive Center1false10.5067/ZF4OXSD2NS7Whttps://doi.org/10.5067/ZF4OXSD2NS7WNSIDC-0795Technical ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-61991-303-492-2468CIRES, 449 UCBUniversity of ColoradoBoulderCO80309-0449USAEARTH SCIENCESPECTRAL/ENGINEERINGRADARRADAR CROSS-SECTION EARTH SCIENCESPECTRAL/ENGINEERINGRADARRADAR REFLECTIVITY EARTH SCIENCESPECTRAL/ENGINEERINGRADARSTOKES PARAMETER Climatology/Meteorology/AtmosphereSMAP-project-L1SMAP-related projectSMAP L-BAND RADARSMAP L-Band RadarSMAPSoil Moisture Active and Passive Observatory2015-10-01active-9090-180180GEOGRAPHIC REGIONGLOBALVariesVariesThese data are freely, openly, and fully accessible, provided that you are logged into your NASA Earthdata profile (https://urs.earthdata.nasa.gov/).These data are freely, openly, and fully available to use without restrictions, provided that you cite the 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 ColoradoBoulderCO80309-0449USAHTTPSnetCDF-4This product represents the first full polarimetric Global Navigation Satellite System Reflectometry (GNSS-R) dataset, derived from the Soil Moisture Active Passive (SMAP) mission radar. The main parameters are the normalized Stokes parameters, total power normalized bistatic radar cross section, and reflectivity. The SMAP radar receiver, in bistatic radar configuration, measures the horizontal and vertical components of the Global Positioning System (GPS) signal as it is reflected and scatters from the Earth’s surface. Stokes parameters are computed with these horizontal and vertical polarization measurements. The dataset comprises a full reconstruction of the Earth' surface polarimetric values, with approximately 3,200 observations per day and about 1,200,000 per year.VIEW RELATED INFORMATIONhttps://doi.org/10.5067/ZF4OXSD2NS7WUser's GuideGET DATAhttps://daacdata.apps.nsidc.org/pub/DATASETS/nsidc0795_SMAP_Reflectometry_v01/HTTPSCEOS IDN DIFVERSION 9.92024-09-122026-02-17NSIDCVersion SummaryInitial releaseNSIDCMinor Version1Changes to this version include:
- Addition of an extra flag for RFI detection to the already existing "quality_flag" variable.
- A calibration correction was applied to the processor as a result of the delta parameter over the ocean being 4 degrees off from the expected -89 degrees. This correction results in a slight change to the Stokes parameters that will be unnoticeable to most users.2025-07-010NSIDCCurrent Version1NSIDCSpatial Reference SystemsEPSG:4326WGS 84NSIDCLevel of ServiceBasicNSIDCFull Dataset CitationRodriguez-Alvarez, N., Munoz-Martin, J. F., Bosch-Lluis, X. & Oudrhiri, K. (2024). <i>SMAP L1B Polarimetric GNSS Reflectometry</i>. (NSIDC-0795, 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/ZF4OXSD2NS7W">https://doi.org/10.5067/ZF4OXSD2NS7W</a>. [<i><describe subset used if applicable></i>].NSIDCRetiredfalseNSIDCRelated Servicesapplication/vnd.nasa.cmr.umm+jsonfalseamyygillilandmmt_service_12717S1977897447-NSIDCV0NSIDCV06service2025-04-01T22:12:52.112Zhttps://daacdata.apps.nsidc.org/NSIDCV0_DAAC_Data_HTTPS_File_SystemNOT PROVIDED1HTTPS File SystemQuickly download a few files using a web browser, or access the data through a command-line utility such as WGET.https://nsidc.org/data/user-resources/help-center/programmatic-access-guide-data-daacdataappsVIEW RELATED INFORMATIONProgrammatic Data Access GuidePublicationURLUSER SERVICESNSIDC DAAC User ServicesEmailnsidc@nsidc.orgDATA ACCESS/RETRIEVALDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESThis is the most current release of this service.DEVELOPERORIGINATORPUBLISHERSERVICE PROVIDERNASA National Snow and Ice Data Center Distributed Active Archive CenterNASA NSIDC DAACNASA Distributed Active Archive Center (DAAC) at NSIDChttps://nsidc.org/daacNSIDC DAAC Home Pagehttps://cdn.earthdata.nasa.gov/umm/service/v1.4UMM-S1.4https://daacdata.apps.nsidc.org/pub/DATASETS/nsidc0795_SMAP_Reflectometry_v01/