2024-03-29T13:48:32Zhttp://nsidc.org/api/dataset/metadata/oaioai:nsidc.org/SPL1CTB_E.0012024-01-25T13:16:54Zecsretirednasa_nsidc_daac
SPL1CTB_E.001SMAP Enhanced L1C Radiometer Half-Orbit 9 km EASE-Grid Brightness TemperaturesChaubell, J., S. Chan, R. S. Dunbar, J. Peng, and S. Yueh.SMAP Enhanced L1C Radiometer Half-Orbit 9 km EASE-Grid Brightness Temperatures2016-12-15Boulder, Colorado USANASA NSIDC DAAC: NASA National Snow and Ice Data Center Distributed Active Archive Center1false10.5067/2C9O9KT6JAWShttps://doi.org/10.5067/2C9O9KT6JAWSSPL1CTB_ETechnical ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-61991-303-492-2468CIRES, 449 UCBUniversity of ColoradoBoulderCO80309-0449USAEARTH SCIENCESpectral/EngineeringMicrowaveBrightness Temperature BRIGHTNESS TEMPERATUREGeoscientific InformationClimatology/Meteorology/AtmosphereBrightness TemperatureEASE-Grid TB-projectRADIOMETERSMAP-projectSoil Moisture Active PassiveSMAP L-BAND RADIOMETERSMAP L-BAND RADIOMETERSMAP ObservatorySoil Moisture Active and Passive Observatory2015-03-312018-06-04complete-85.04485.044-180180Geographic RegionGlobal Land9 km9 km49 minuteSMAPSoil Moisture Active PassiveEach 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.As a condition of using these data, you must cite the use of this data set using the recommended citation. For more information, see our Use and Copyright Web page at http://nsidc.org/about/use_copyright.html.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 ColoradoBoulderCO80309-0449USAHTTPS50 MBHDF5Brodzik, M. J., B. Billingsley, T. Haran, B. Raup, and M. H. Savoie. 2014. Correction: Brodzik, M. J. et al. 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. 2016. SMAP Level 1C Radiometer (L1C_TB) Product Specification Document. Pasadena, CA: SMAP Project, JPL D-56290, Jet Propulsion Laboratory. (PDF, 1 MB)
Chaubell, J. 2016. SMAP Algorithm Theoretical Basis Document (ATBD) Level-1B Enhancement Radiometer Data Product (L1B_TB_E). SMAP Project, JPL D-56287, Jet Propulsion Laboratory, Pasadena, CA. (PDF, 1.5 MB)
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)
Piepmeier, Jeffrey, Steven Chan, Julian Chaubell, Jinzheng Peng, Rajat Bindlish, Alexandra Bringer, Andreas Colliander, Giovanni De Amici, E. P. Dinnat, Derek Hudson, Tom Jackson, Joel Johnson, David Le Vine, Thomas Meissner, Sidharth Misra, Priscilla Mohammed, Dara Entekhabi, and Simon Yueh. 2016. SMAP Radiometer Brightness Temperature Calibration for the L1B_TB, L1C_TB (Version 3), and L1C_TB_E (Version 1) Data Products, SMAP Project, JPL D-56295, Jet Propulsion Laboratory, Pasadena, CA. (PDF, 1.4 MB)
Piepmeier, J. R. et al. 2015. SMAP Algorithm Theoretical Basis Document: L1B Radiometer Product. SMAP Project, NASA GSFC SMAP-006, NASA Goddard Space Flight Center, Greenbelt, MD. (PDF, 6 MB)
Piepmeier, J. and S. Chan. 2015a. Soil Moisture Active Passive (SMAP) Project Radiometer Brightness Temperature Calibration for the L1B_TB and L1C_TB Validated Version 2 Data Products. SMAP Project, JPL D-93718. Jet Propulsion Laboratory, Pasadena, CA. (PDF, 1 MB)
Piepmeier, J. and S. Chan. 2015b. Soil Moisture Active Passive (SMAP) Project Radiometer Brightness Temperature Calibration for the L1B_TB and L1C_TB Beta-Level Data Products. SMAP Project, JPL D-93978. Jet Propulsion Laboratory, Pasadena, CA. (PDF, 3.15 MB)
Poe, G. A. 1990. Optimum Interpolation of Imaging Microwave Radiometer Data. IEEE Transactions on Geoscience and Remote Sensing 28(5):800-810.
This enhanced Level-1C (L1C) product contains calibrated, 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 Level-1B (L1B) interpolated antenna temperatures. Backus-Gilbert optimal interpolation techniques are used to extract maximum information from SMAP antenna temperatures and convert them to brightness temperatures, which are posted to a 9 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.VIEW RELATED INFORMATIONhttps://doi.org/10.5067/2C9O9KT6JAWSDocumentationGET DATAhttps://nsidc.org/data/data-access-tool/SPL1CTB_E/versions/1/Data Access ToolVIEW 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 INFORMATIONhttp://nsidc.org/data/docs/daac/smap/sp_l1c_tb/pdfs/279_L1C_TB_ATBD_RevA_web.pdfAlgorithm Theoretical Basis Document (ATBD)CEOS IDN DIFVERSION 9.92016-12-152024-01-25NSIDCVersion SummaryFirst public data releaseNSIDCMinor VersionR14010First public data release2015-03-312017-04-241R15060<ul>Changes to this version include:
<li>Processing capabilities for the upcoming SMAP/Sentinel-1 radiometer/radar soil moisture product</li>
<li>SPL1BTB processing change to Atmospheric Correction to ensure proper unit conversion</li>
<li>Changes to resolve bugs that were causing SPL1BTB_E processing to fail</li>
<li>Note: Temporal coverage for CRID R15060 varies slightly; though the majority of R15060 files begin at 2017-04-24 (11:00), some R15060 files appear earlier in the time series.</li></ul>2017-04-242017-09-062R15152 <ul><li>Updated compiler optimization flag in radiometer processor to reduce run time</li>
<li>Compiled optimization flags</li>
<li>Bug fix for initialization error (error surfaced by optimization flags)</li>
<li>Note that the data content/quality has not changed</li>
</ul>2017-09-032017-11-143R15180No science change. CRID incremented to coincide with release of the new SMAP/Sentinel-1 L2 Radiometer/Radar 30-Second Scene 3 km EASE-Grid Soil Moisture (SPL2SMAP_S) product.2017-10-262018-01-084R15181No science change. CRID incremented to coincide with an update to the radiometer reflector ancillary file for January and February 2018.2017-12-102018-03-145R15182No science change. CRID incremented to coincide with an update to the radiometer reflector ancillary file for January through December 2018.2018-03-142018-06-046NSIDCLevel of ServiceNo Data AccessNSIDCFull Dataset CitationChaubell, J., S. Chan, R. S. Dunbar, J. Peng, and S. Yueh. 2016. <i>SMAP Enhanced L1C Radiometer Half-Orbit 9 km EASE-Grid Brightness Temperatures.</i> [indicate subset used]. Boulder, Colorado USA: NASA National Snow and Ice Data Center Distributed Active Archive Center. <a href="https://doi.org/10.5067/2C9O9KT6JAWS">https://doi.org/10.5067/2C9O9KT6JAWS</a>. [Date Accessed].NSIDCRetiredtrueNSIDCRelated Servicesapplication/vnd.nasa.cmr.umm+jsonfalsejroebuckmmt_service_14315S2011082551-NSIDC_ECSNSIDC_ECS8service2023-05-11T22:54:38.255Zhttps://n5eil02u.ecs.nsidc.org/egi/requestNSIDC_ECS_EGI_API_SMAP_L1L2_PSESI23.1Customized Programmatic Data Access ServiceProgrammatically request selected data products through our API. This tool is valuable for selecting just the parameters you need from big data sets. Apply spatial and temporal filters, subsetting, reformatting, and reprojection.https://nsidc.org/support/how/how-do-i-programmatically-request-data-servicesVIEW RELATED INFORMATIONProgrammatic Data Access GuidePublicationURLUSER SERVICESNSIDC DAAC User ServicesEmailnsidc@nsidc.orgESRIGeoJSONKMLfalsetrueHDF5ASCIIGEOTIFFHDF-EOS5HDF5KMLNETCDF-3NETCDF-4WGS 84 / NSIDC EASE-Grid NorthEPSG:6931WGS 84 / NSIDC EASE-Grid GlobalEPSG:6933WGS 84 / NSIDC EASE-Grid SouthEPSG:6932GeographicEPSG:4326Polar StereographicUTM Northern HemisphereUTM Southern Hemisphere2023-04-19T00:00:00.000ZDATA INTEROPERABILITYDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESDATA REFORMATTINGDATA ACCESS/RETRIEVALDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESDATA CUSTOMIZATIONDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESREPROJECTIONSUBSETTING/SUPERSETTINGDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESSPATIAL SUBSETTINGSUBSETTING/SUPERSETTINGDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESVARIABLE SUBSETTINGThis is the most current release of this service.SERVICE 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 page.DEVELOPERORIGINATORPUBLISHERMaintenance and Development, Earth Observing System Data and Information System, Earth Observing System,Goddard Space Flight Center, NASANASA/GSFC/EOS/EOSDIS/EMDEOSDIS Core System Maintenance and Developmenthttps://earthdata.nasa.gov/eosdisEOSDIS home page.https://cdn.earthdata.nasa.gov/umm/service/v1.4UMM-S1.4https://nsidc.org/support/how/how-do-i-programmatically-request-data-servicesapplication/vnd.nasa.cmr.umm+jsonfalsetdwilliaNSIDC_ECS_PROD_ECHO_ORDERS_serviceS1568899363-NSIDC_ECSNSIDC_ECS8service2023-05-31T15:37:55.746Zhttps://n5eil02u.ecs.nsidc.org/ops/cobi/ECHO ORDERS Service for NSIDC_ECS EOSDIS Service ImplementationNSIDC_ECS_ECHO_ORDERSECHO ORDERS1NSIDC_ECS EOSDIS ECHO ORDERS Service ImplementationNSIDC_ECS EOSDIS ECHO ORDERS Service ImplementationAvailableNONEDATA ACCESS/RETRIEVALDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESDATA DELIVERYDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESNONEPUBLISHERNASA National Snow and Ice Data Center Distributed Active Archive CenterNASA/NSIDChttps://cdn.earthdata.nasa.gov/umm/service/v1.4UMM-S1.4https://n5eil02u.ecs.nsidc.org/ops/cobi/application/vnd.nasa.cmr.umm+jsonfalseamy.steikermmt_service_12641S1977894169-NSIDC_ECSNSIDC_ECS9service2022-07-01T18:43:22.565Zhttps://n5eil01u.ecs.nsidc.org/NSIDC_ECS_DAAC_HTTPS_File_SystemNOT PROVIDED20.2HTTPS File SystemQuickly download a few files using a web browser, or access data through a command-line utility such as WGET.https://nsidc.org/support/how/how-do-i-programmatically-request-data-servicesVIEW RELATED INFORMATIONProgrammatic Data Access GuidePublicationURLUSER SERVICESNSIDC DAAC User ServicesEmailnsidc@nsidc.org2020-10-21T00:00:00.000ZDATA ACCESS/RETRIEVALDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESThis is the most current release of this service.ORIGINATORPUBLISHERSERVICE 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 pageDEVELOPERMaintenance and Development, Earth Observing System Data and Information System, Earth Observing System,Goddard Space Flight Center, NASANASA/GSFC/EOS/EOSDIS/EMDhttps://cdn.earthdata.nasa.gov/umm/service/v1.4UMM-S1.4https://nsidc.org/support/how/how-do-i-programmatically-request-data-servicesNSIDCRelated Toolsapplication/vnd.nasa.cmr.umm+jsonfalseamy.steikermmt_tool_12821TL1977971361-NSIDC_ECSNSIDC_ECS6tool2022-07-01T18:41:00.427ZGOTO WEB TOOLhttps://search.earthdata.nasa.gov/searchDistributionURLNSIDC_ECS_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