2026-04-11T22:11:43Zhttp://nsidc.org/api/dataset/metadata/oaioai:nsidc.org/SPL1BTB.0022026-03-31T22:11:21Zcumulusretirednasa_nsidc_daac
SPL1BTB.002SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness TemperaturesPiepmeier, J. R., Mohammed, P., Peng, J., Kim, E. J., De Amici, G. & Ruf, C.SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures2015-10-30Boulder, Colorado USANASA NSIDC DAAC: NASA National Snow and Ice Data Center Distributed Active Archive Center2false10.5067/VIQYQV0AJATIhttps://doi.org/10.5067/VIQYQV0AJATISPL1BTBTechnical ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-61991-303-492-2468CIRES, 449 UCBUniversity of ColoradoBoulderCO80309-0449USAEARTH SCIENCESPECTRAL/ENGINEERINGMICROWAVEANTENNA TEMPERATURE EARTH SCIENCESPECTRAL/ENGINEERINGMICROWAVEBRIGHTNESS TEMPERATURE Climatology/Meteorology/AtmosphereGeoscientific InformationRaw Observation CountsRAW TELEMETRY DATASMAP-projectSoil Moisture Active PassiveSMAP L-BAND RADARSMAP L-Band RadarSMAPSoil Moisture Active and Passive Observatory2015-03-312016-04-21deprecated-86.486.4-180180GEOGRAPHIC REGIONGLOBAL LAND47 km36 km49 minute<h4>Quality Overview </h4>
<p>SMAP products provide multiple means to assess quality. Each product contains bit flags, uncertainty measures, and file-level metadata that provide quality information. The <a href="/data/docs/daac/smap/sp_l1b_tb/data-fields.html">Data Fields</a> document describes the specific bit flags, uncertainty measures, and file-level metadata contained in this product. </p>
<p>A Quality Assessment
(QA) file is also associated with each SMAP data product. Each HDF5 file contains metadata with QA metadata flags that are set by the Science Data Processing
System (SDS) at JPL prior to delivery
to 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 file-level metadata. Various levels of QA are conducted with Level-1A 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 granule fails QA, the SDS does not send the
granule to NSIDC DAAC until it is reprocessed.</p>
<p>Refer to the <a href="http://.nsidc.org/data/docs/daac/smap/sp_l1b_tb/data-fields.html">Data Fields</a> document for details on all data flags.</p>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 ColoradoBoulderCO80309-0449USAFTP1.4 GBHDF5HTTPS1.4 GBHDF5Entekhabi, 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)
Mohammed-Tano, P. 2015. Soil Moisture Active Passive (SMAP) Project Level 1B-TB Product Specification Document. Pasadena, CA USA: SMAP Project, JPL D-92339, Jet Propulsion Laboratory. Pasadena, CA. (http://nsidc.org/data/docs/daac/smap/sp_l1b_tb/pdfs/D-92339-A_SMAP_Radiometer_Level_1B_TB_PDS_150720_with sigs.pdf, 1 MB)
Piepmeier, J. R., D. G. Long, and E. G. Njoku. 2008. Stokes Antenna Temperatures. IEEE Trans. Geosci. Remote Sens. 46(2):516-527.
Piepmeier, J. R. , J. T. Johnson, P. N. Mohammed, D. Bradley, C. Ruf, M. Aksoy, R. Garcia, D. Hudson, L. Miles, and M. Wong. 2014. Radio-Frequency Interference Mitigation for the Soil Moisture Active Passive Microwave Radiometer. IEEE Transactions on Geoscience and Remote Sensing. 52(1):761-775. doi: http://dx.doi.org/10.1109/TGRS.2013.2281266.
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. (http://nsidc.org/data/docs/daac/smap/sp_l1b_tb/pdfs/278_L1B_TB_RevA_web.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. (http://nsidc.org/data/docs/daac/smap/sp_l1b_tb/pdfs/SMAP L1B_TB Validated Release Assessment Report FINAL.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. (http://nsidc.org/data/docs/daac/smap/sp_l1b_tb/pdfs/L1B-L1C-Beta-Report.pdf, 3.15 MB)This Level-1B (L1B) product provides calibrated estimates of time-ordered geolocated brightness temperatures measured by the Soil Moisture Active Passive (SMAP) passive microwave radiometer. Brightness temperatures are referenced to the Earth's surface with undesired and erroneous radiometric sources removed. Sources of contamination include Faraday rotation, energy detected from antenna sidelobes and spillover, atmospheric effects, solar radiation, lunar radiation, cosmic microwave background, and galactic emission.VIEW RELATED INFORMATIONhttps://doi.org/10.5067/VIQYQV0AJATIUser'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 INFORMATIONhttp://nsidc.org/data/docs/daac/smap/sp_l1b_tb/pdfs/278_L1B_TB_RevA_web.pdfAlgorithm Theoretical Basis Document (ATBD)CEOS IDN DIFVERSION 9.92015-10-302026-03-31NSIDCVersion SummaryChanges to this version include: (1) Transitioned to Validated-Stage 1. (2) Using SPL1BTB V2 data as input, inherited all changes and improvements of the new version.NSIDCMinor VersionR12160No science change. CRID incremented to coincide with DOI correction for SPL2SMP and SPL3SMP. 2015-10-262015-10-271R12170Changed with Version 2 update.2015-03-312R12240No science change. CRID incremented to coincide with changes made for radar and SPL2SMP processing.2015-12-172015-12-313R12241Updated the radiometer reflector table to include the expected temperatures for the radome and reflector for 2016.2015-12-312016-04-214NSIDCLevel of ServiceNo Data AccessNSIDCFull Dataset CitationPiepmeier, J. R., Mohammed, P., Peng, J., Kim, E. J., De Amici, G. & Ruf, C. (2015). <i>SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures</i>. (SPL1BTB, Version 2). [Data Set]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. <a href="https://doi.org/10.5067/VIQYQV0AJATI">https://doi.org/10.5067/VIQYQV0AJATI</a>. [<i><describe subset used if applicable></i>].NSIDCRetiredtrue