2026-06-17T03:00:28Zhttp://nsidc.org/api/dataset/metadata/oai

oai:nsidc.org/SPL1CTB.0012026-03-23T21:16:40Zcumulusretirednasa_nsidc_daac

SPL1CTB.001SMAP 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 Temperatures2015-07-23Boulder, Colorado USANASA NSIDC DAAC: NASA National Snow and Ice Data Center Distributed Active Archive Center1false10.5067/RP9DZ1CC6XNPhttps://nsidc.org/sites/default/files/spl1ctb_v1.pdfSPL1CTBTechnical ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-61991-303-492-2468

CIRES, 449 UCB

University of Colorado

BoulderCO80309-0449USAEARTH SCIENCESPECTRAL/ENGINEERINGMICROWAVEBRIGHTNESS TEMPERATURE Climatology/Meteorology/AtmosphereGeoscientific InformationBrightness TemperatureSMAP-projectSoil Moisture Active PassiveSMAP L-BAND RADARSMAP L-Band RadarSMAPSoil Moisture Active and Passive Observatory2015-03-312015-10-26deprecated-85.04485.044-180180GEOGRAPHIC REGIONGLOBAL LAND36 km36 km49 minute<p>Though SMAP Level-1 radiometer data are available from 31 March 2015, these Beta-level data employ preliminary algorithms that are still being validated and are thus subject to uncertainties. Data users who wish to use data with the highest quality possible should use data beginning with half-orbit 1216 A, which includes data acquired on 24 April 2015.</p> <p>For in-depth details regarding the quality of these Beta-level data, refer to the following report: <br> <a href="/data/docs/daac/smap/sp_l1b_tb/pdfs/L1B-L1C-Beta-Report.pdf">Soil Moisture Active Passive (SMAP) Project Radiometer Brightness Temperature Calibration for the L1B_TB and L1C_TB Beta-Level Data Products</a></p> <h4>Quality Overview </h4> <p>Each 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. 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 file/granule fails QA, the SDS does not send the granule to NSIDC DAAC until it is reprocessed. Level-1C products that fail QA are never delivered to NSIDC DAAC. Only a QA file is produced when there are no Level-1C brightness temperature data that qualify for retrieval.</p> <p align="left">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 will be evaluated in a number of ways. These include:</p> <ul> <li>Comparing images and examining differences between the two products over coastlines and other discrete boundaries, and heterogeneous terrain (lakes, mountains, rivers).</li> <li>Comparing TB and TB-gradient histograms of the two products over regions of varying heterogeneity.</li> </ul> <p>Refer to the <a href="/data/docs/daac/smap/sp_l1c_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.org1-303-492-6199

National Snow and Ice Data Center

CIRES, 449 UCB

University of Colorado

BoulderCO80309-0449USAFTP5 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, 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. (http://nsidc.org/data/docs/daac/smap/sp_l1c_tb/pdfs/279_L1C_TB_ATBD_RevA_web.pdf, 3 MB) Chan, Steven, and R. Scott Dunbar. 2015. SMAP Level 1C Radiometer (L1C_TB) Product Specification Document. Pasadena, CA: SMAP Project, JPL D-72545, Jet Propulsion Laboratory. (http://nsidc.org/data/docs/daac/smap/sp_l1c_tb/pdfs/D-72545, SMAP L1C_TB Product Specification Document with sigs.pdf, 1 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, 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-1C (L1C) product contains calibrated, geolocated, time-ordered 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. Input SMAP L-band Level-1B brightness temperature data were resampled to an Earth-fixed, 36 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0) in three projections: global cylindrical, north polar, and south polar. This L1C product is a gridded version of the SMAP Level-1B radiometer brightness temperature product.

VIEW RELATED INFORMATIONhttps://nsidc.org/sites/default/files/spl1ctb_v1.pdfSMAP L1C Radiometer Half-Orbit 36 km EASE-Grid Brightness Temperatures, Version 1 User 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_l1c_tb/pdfs/279_L1C_TB_ATBD_RevA_web.pdfAlgorithm Theoretical Basis Document (ATBD)CEOS IDN DIFVERSION 9.92015-07-232026-03-23NSIDCVersion SummaryFirst public data releaseNSIDCMinor VersionR11850

First public data release

2015-03-312015-09-091R11920

No science change. CRID incremented to coincide with release of SPL2SMP V1 Beta and SPL3SMP V1 Beta data.

2015-08-022015-10-262NSIDCLevel of ServiceNo Data AccessNSIDCFull Dataset CitationChan, S., Njoku, E. G. & Colliander, A. (2015). <i>SMAP L1C Radiometer Half-Orbit 36 km EASE-Grid Brightness Temperatures</i>. (SPL1CTB, 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/RP9DZ1CC6XNP">https://doi.org/10.5067/RP9DZ1CC6XNP</a>. [<i><describe subset used if applicable></i>].NSIDCRetiredtrue