2026-04-17T08:31:21Zhttp://nsidc.org/api/dataset/metadata/oaioai:nsidc.org/SPL1CTB.0052026-03-03T21:04:47Zcumulusecsretirednasa_nsidc_daac
SPL1CTB.005SMAP L1C Radiometer Half-Orbit 36 km EASE-Grid Brightness TemperaturesChan, S., Njoku, E. G. & Colliander, A.SMAP L1C Radiometer Half-Orbit 36 km EASE-Grid Brightness Temperatures2020-09-01Boulder, Colorado USANASA NSIDC DAAC: NASA National Snow and Ice Data Center Distributed Active Archive Center5false10.5067/JJ5FL7FRLKJIhttps://nsidc.org/sites/default/files/spl1ctb-v005-userguide_0.pdfSPL1CTBTechnical ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-61991-303-492-2468CIRES, 449 UCBUniversity of ColoradoBoulderCO80309-0449USAEARTH SCIENCESPECTRAL/ENGINEERINGMICROWAVEBRIGHTNESS TEMPERATURE Climatology/Meteorology/AtmosphereGeoscientific InformationEASE-Grid SM-projectL1SMAP-projectSMAP-project-L1SMAP L-BAND RADIOMETERSMAP L-Band RadiometerSMAPSoil Moisture Active and Passive Observatory2015-03-312023-12-04deprecated-85.04485.044-180180GEOGRAPHIC REGIONGLOBAL36 km36 km49 minuteEach HDF5 file contains metadata with Quality Assessment (QA) metadata flags that are set by the SDS at the JPL prior to delivery to the National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). A separate metadata file with an .xml file extension is also delivered to NSIDC DAAC with the HDF5 file; it contains the same information as the HDF5 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.
Various levels of QA are conducted with Level-1C data. 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.
In addition, during the post-launch Calibration/Validation period, the performance of the Level-1C brightness temperature product relative to the Level-1B brightness temperature product are evaluated in a number of ways. These include:
Comparing images and examining differences between the two products over coastlines and other discrete boundaries, and heterogeneous terrain (lakes, mountains, rivers).
Comparing TB and TB-gradient histograms of the two products over regions of varying heterogeneity.
Refer to the Data Fields document for details on all data flags.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 ColoradoBoulderCO80309-0449USAHTTPS174 MBHDF5Chan, S., Njoku, E., Colliander, A. 2014. SMAP Algorithm Theoretical Basis Document (ATBD) Level-1C Radiometer Data Product (L1C_TB). SMAP Project, Jet Propulsion Laboratory, Pasadena, CA. (PDF, 3 MB; see Technical References)
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)This Level-1C (L1C) product contains calibrated and geolocated brightness temperatures acquired by the Soil Moisture Active Passive (SMAP) radiometer during 6:00 a.m. descending and 6:00 p.m. ascending half-orbit passes. This product is derived from SMAP L-band Level-1B time-ordered brightness temperatures resampled to an Earth-fixed, 36 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0) in three projections: global cylindrical, Northern Hemisphere azimuthal, and Southern Hemisphere azimuthal. This L1C product is a gridded version of the SMAP time-ordered Level-1B radiometer brightness temperature product.VIEW RELATED INFORMATIONhttps://nsidc.org/sites/default/files/spl1ctb-v005-userguide_0.pdfSMAP L1C Radiometer Half-Orbit 36 km EASE-Grid Brightness Temperatures, Version 5 User GuideCEOS IDN DIFVERSION 9.92020-09-012026-03-03NSIDCVersion SummaryChanges to this version include:
- An improved calibration methodology was applied to the input Level-1B radiometer brightness temperatures.
- The data algorithms, structure, content, or processor code are otherwise unchanged from the previous version.
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 VersionR17000Changed with update to version 5. See Major Version Summary.2015-03-312021-03-291R17030No science change. CRID incremented to coincide with ASA correction for SPL1BTB2021-04-292023-12-0417NSIDCSpatial Reference SystemsEPSG:6931WGS 84 / NSIDC EASE-Grid 2.0 NorthEPSG:6932WGS 84 / NSIDC EASE-Grid 2.0 SouthEPSG:6933WGS 84 / NSIDC EASE-Grid 2.0 GlobalNSIDCLevel of ServiceNo Data AccessNSIDCFull Dataset CitationChan, S., Njoku, E. G. & Colliander, A. (2020). <i>SMAP L1C Radiometer Half-Orbit 36 km EASE-Grid Brightness Temperatures</i>. (SPL1CTB, Version 5). [Data Set]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. <a href="https://doi.org/10.5067/JJ5FL7FRLKJI">https://doi.org/10.5067/JJ5FL7FRLKJI</a>. [<i><describe subset used if applicable></i>].NSIDCRetiredtrueNSIDCRelated Servicesapplication/vnd.nasa.cmr.umm+jsonfalseamy.steikermmt_service_25004S2472217299-NSIDC_CPRDNSIDC_CPRD1service2022-09-20T22:05:06.185Zs3://nsidc-cumulus-prod-protected/NSIDC_CPRD_S3NOT PROVIDED1.0NASA Earthdata Cloud (AWS S3)Access data directly from the NASA Earthdata Cloud via Amazon Web Services Simple Storage Service (AWS S3). This access option is only available when working within the us-west-2 region and requires additional AWS S3 credentials.https://nsidc.org/data/user-resources/help-center/nasa-earthdata-cloud-data-access-guideVIEW RELATED INFORMATIONNASA Earthdata Cloud Data Access GuidePublicationURLhttps://data.nsidc.earthdatacloud.nasa.gov/s3credentialsVIEW RELATED INFORMATIONAWS S3 CredentialsPublicationURLUSER SERVICESNSIDC DAAC User ServicesEmailnsidc@nsidc.orgDATA ACCESS/RETRIEVALDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESThis is the most current release of this service. Last updated date is unknown.SERVICE PROVIDERNASA National Snow and Ice Data Center Distributed Active Archive CenterNASA NSIDC DAAChttps://cdn.earthdata.nasa.gov/umm/service/v1.4UMM-S1.4https://nsidc.org/data/user-resources/help-center/nasa-earthdata-cloud-data-access-guideNSIDCRelated Toolsapplication/vnd.nasa.cmr.umm+jsonfalsembeigmmt_tool_50907TL3010466318-NSIDC_CPRDNSIDC_CPRD4tool2024-05-28T17:29:12.271Zhttps://zenodo.org/badge/latestdoi/399867529DOWNLOAD SOFTWAREhttps://earthaccess.readthedocs.io/en/latest/DistributionURLNSIDC_CPRD_EARTHACCESSDownloadable Tool0.9.0earthaccessearthaccess is a python library to search and access NASA Earth science data with just a few lines of code.https://github.com/nsidc/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
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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The above copyright notice and this permission notice shall be included in all
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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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.2024-02-29T00:00:00.000ZAs 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/latest/application/vnd.nasa.cmr.umm+jsonfalsecrumlydmmt_tool_14311TL3914225088-NSIDC_CPRDNSIDC_CPRD1tool2025-12-15T19:28:44.840ZDOWNLOAD SOFTWAREhttps://www.hdfgroup.org/downloads/hdfview/DistributionURLNSIDC_CPRD_HDFViewDownloadable Tool1HDFViewExplore contents of HDF4 and HDF5 files, including file structure, metadata, and parameter values.https://portal.hdfgroup.org/display/HDFVIEW/HDFView+3.x+User%27s+GuideVIEW RELATED INFORMATIONHDFView 3.X User's GuidePublicationURLDATA VISUALIZATIONDATA ANALYSIS AND VISUALIZATIONEARTH SCIENCE SERVICESSERVICE PROVIDERNSIDC DAAC User ServicesEmailnsidc@nsidc.orgDEVELOPERPUBLISHERHierarchical Data Format, The National Center for Supercomputing Applications, University of Illinois at Urbana-Champaignhttps://www.hdfgroup.org/UI-UC/NCSA/HDFThis is the most current release of this tool. Last updated date is unknown.https://cdn.earthdata.nasa.gov/umm/tool/v1.0UMM-T1.0HDF-EOS2HDF-EOS5HDF4HDF5NETCDF-3NETCDF-4ASCIIHDF4HDF5WindowsmacOSLinuxhttps://www.hdfgroup.org/downloads/hdfview/application/vnd.nasa.cmr.umm+jsonfalsecrumlydease_toolsTL3915895804-NSIDC_CPRDNSIDC_CPRD1tool2025-12-16T18:38:49.912ZDOWNLOAD SOFTWAREhttps://github.com/nsidc/easegrids-easeconvDistributionURLNSIDC_CPRD_EASE_ToolsDownloadable Tool0.3 EASE-Grid Data Geolocation ToolsGeolocate and display EASE-Grid and EASE-Grid 2.0 data sets with IDL software.https://nsidc.org/support/faq/does-nsidc-have-tools-geolocating-and-displaying-ease-grid-data-setsVIEW RELATED INFORMATIONDoes NSIDC have tools for geolocating and displaying EASE-Grid data sets?PublicationURLDATA ANALYSISDATA ANALYSIS AND VISUALIZATIONEARTH SCIENCE SERVICESSERVICE PROVIDERNSIDC DAAC User ServicesEmailnsidc@nsidc.orgDEVELOPERNASA National Snow and Ice Data Center Distributed Active Archive Centerhttps://nsidc.org/daac/NASA NSIDC DAAC2013-12-18T00:00:00.000ZThis is the most current release of this tool.https://cdn.earthdata.nasa.gov/umm/tool/v1.0UMM-T1.0IDLhttps://github.com/nsidc/easegrids-easeconvapplication/vnd.nasa.cmr.umm+jsonfalsecrumlydmmt_tool_13636TL3915896594-NSIDC_CPRDNSIDC_CPRD1tool2025-12-16T18:39:31.244ZDOWNLOAD SOFTWAREhttp://hdfeos.org/zoo/index.phpDistributionURLNSIDC_CPRD_HDF-EOS_Tools_Info_CenterDownloadable Tool1HDF-EOS Code ExamplesUse example Python, MATLAB, IDL, or NCL code to import, read, and/or visualize select NSIDC DAAC data products.DATA VISUALIZATIONDATA ANALYSIS AND VISUALIZATIONEARTH SCIENCE SERVICESDATA ACCESS/RETRIEVALDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESSERVICE PROVIDERNSIDC DAAC User ServicesEmailnsidc@nsidc.orgAUTHORDEVELOPERPUBLISHERSERVICE PROVIDERHDF-EOS Tools and Information CenterEmaileoshelp@hdfgroup.orgAUTHORDEVELOPERPUBLISHERSERVICE PROVIDERHierarchical Data Format, The National Center for Supercomputing Applications, University of Illinois at Urbana-Champaignhttps://www.hdfgroup.org/UI-UC/NCSA/HDFThis is the most current release of this tool. Last updated date is unknown.https://cdn.earthdata.nasa.gov/umm/tool/v1.0UMM-T1.0MATLABPythonIDLhttp://hdfeos.org/zoo/index.phpapplication/vnd.nasa.cmr.umm+jsonfalsecrumlydmmt_tool_14328TL3914219125-NSIDC_CPRDNSIDC_CPRD6tool2025-12-15T23:27:51.929ZDOWNLOAD SOFTWAREhttps://www.giss.nasa.gov/tools/panoply/DistributionURLNSIDC_CPRD_PanoplyDownloadable Tool1Panoply Data ViewerVisualize georeferenced arrays in NetCDF, HDF and GRIB formats. Plot data on global or regional maps, choosing from multiple map projections. Overlay continent outlines or masks.
DATA VISUALIZATIONDATA ANALYSIS AND VISUALIZATIONEARTH SCIENCE SERVICESSTATISTICAL APPLICATIONSDATA ANALYSIS AND VISUALIZATIONEARTH SCIENCE SERVICESDATA ANALYSISDATA ANALYSIS AND VISUALIZATIONEARTH SCIENCE SERVICESSERVICE PROVIDERNSIDC DAAC User ServicesEmailnsidc@nsidc.orgAUTHORDEVELOPERPUBLISHERGoddard Institute for Space Studies, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASAhttps://www.giss.nasa.gov/NASA/GSFC/SED/ESD/GISSAUTHORDEVELOPERSchmunkDr. RobertEmailrobert.b.schmunk@nasa.govPlease send bug reports, feature requests, etc., to Dr. Robert Schmunk. Please note that requests for assistance opening a dataset or interpreting the gridding of the data within will probably require that you provide a copy of the dataset or instructions on where it might be downloaded.This is the most current release of this tool. Last updated date is unknown.https://cdn.earthdata.nasa.gov/umm/tool/v1.0UMM-T1.0HDF-EOS2HDF-EOS5HDF4HDF5NETCDF-3NETCDF-4ASCIICSVGIFHDF-EOS2HDF-EOS5HDF4HDF5JPEGKMLNETCDF-3NETCDF-4PNGTIFFWindowsmacOSLinuxhttps://www.giss.nasa.gov/tools/panoply/application/vnd.nasa.cmr.umm+jsonfalsecrumlydmmt_tool_13889TL4016626483-NSIDC_CPRDNSIDC_CPRD1tool2026-02-10T21:43:13.884ZGOTO WEB TOOLhttps://cloudsgate2.larc.nasa.gov/cgi-bin/predict/predict.cgiDistributionURLNSIDC_CPRD_NASA_LaRCWeb User Interface1NASA LaRC Satellite Overpass PredictorCalculate past and future satellite overpasses, based on latitude/longitude or map location.DATA VISUALIZATIONDATA ANALYSIS AND VISUALIZATIONEARTH SCIENCE SERVICESSERVICE PROVIDERNSIDC DAAC User ServicesEmailnsidc@nsidc.orgAUTHORDEVELOPERORIGINATORPUBLISHERSERVICE PROVIDERLangley Research Center Distributed Active Archive Center, Science Directorate, Langley Research Center, NASAOtherhttps://asdc.larc.nasa.gov/AUTHORDEVELOPERORIGINATORPUBLISHERSERVICE PROVIDERLangley Research Center Distributed Active Archive Center, Science Directorate, Langley Research Center, NASAhttps://asdc.larc.nasa.gov/NASA/LARC/SD/LARC_DAACSERVICE PROVIDERMinnisPatrick Emailp.minnis@larc.nasa.govSERVICE PROVIDERNguyenLouisEmaill.nguyen@nasa.govSee https://cloudsgate2.larc.nasa.gov/cgi-bin/predict/predict.cgi for more information on the latest version.https://cdn.earthdata.nasa.gov/umm/tool/v1.0UMM-T1.0https://cloudsgate2.larc.nasa.gov/cgi-bin/predict/predict.cgiapplication/vnd.nasa.cmr.umm+jsonfalsecrumlydmmt_tool_12314TL4019511337-NSIDC_CPRDNSIDC_CPRD1tool2026-02-11T17:42:34.275ZGOTO WEB TOOLhttps://nsidc.org/data/data-access-tool/DistributionURLNSIDC_CPRD_Data_Access_ToolWeb User Interface3.1.0Data Access ToolFilter files before downloading based on date, spatial area, or file name. Choose from various download options, such as Python script. Export bounding boxes as a GeoJSON.https://nsidc.org/support/how/search-filter-and-order-nsidc-dataVIEW RELATED INFORMATIONHow to filter and order from a data set web pagePublicationURLhttps://nsidc.org/data/user-resources/help-center/how-to-use-earthdata-downloadVIEW RELATED INFORMATIONHow to use Earthdata DownloadPublicationURLDATA SEARCHDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESDATA ACCESS/RETRIEVALDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESSERVICE PROVIDERNSIDC User ServicesEmailnsidc@nsidc.orgDEVELOPERPUBLISHERSERVICE PROVIDERNASA National Snow and Ice Data Center Distributed Active Archive Centerhttps://nsidc.org/daac/NASA NSIDC DAAC2025-04-16T00:00:00.000ZChromeFirefoxSafariSee https://github.com/nsidc/data-access-tool-ui/blob/main/CHANGELOG.md for more information on the latest version.https://cdn.earthdata.nasa.gov/umm/tool/v1.0UMM-T1.0https://nsidc.org/data/data-access-tool/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/searchapplication/vnd.nasa.cmr.umm+jsonfalsecrumlydmmt_tool_12447TL4019526230-NSIDC_CPRDNSIDC_CPRD1tool2026-02-11T17:47:57.097ZGOTO WEB TOOLhttps://worldview.earthdata.nasa.gov/DistributionURLNSIDC_CPRD_WORLDVIEWWeb User Interface1NASA WorldviewBrowse and display global satellite imagery layers from NASA GIBS. Download raw data, share screenshots, and create animations from the imagery.https://nsidc.org/support/how/visualize-and-download-nsidc-data-nasa-worldviewVIEW RELATED INFORMATIONHow to visualize and download data with NASA WorldviewPublicationURLDATA VISUALIZATIONDATA ANALYSIS AND VISUALIZATIONEARTH SCIENCE SERVICESDATA SEARCHDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESDATA ACCESS/RETRIEVALDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESDATA INTEROPERABILITYDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESDATA REFORMATTINGDATA CUSTOMIZATIONDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESGEOGRAPHIC INFORMATION SYSTEMSDATA ANALYSIS AND VISUALIZATIONEARTH SCIENCE SERVICESSERVICE PROVIDERNSIDC User Services OfficeEmailnsidc@nsidc.orgSERVICE PROVIDERWorldviewEmailsupport@earthdata.nasa.govDEVELOPERPUBLISHERSERVICE PROVIDERMaintenance 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/EMDSee https://github.com/nasa-gibs/worldview/releases for more information on the latest version.https://cdn.earthdata.nasa.gov/umm/tool/v1.0UMM-T1.0GEOTIFFGIFJPEGKMLPNGhttps://worldview.earthdata.nasa.gov/