2024-03-29T06:13:49Zhttp://nsidc.org/api/dataset/metadata/oaioai:nsidc.org/SPL2SMA.0032023-11-29T21:17:14Znasa_nsidc_daacecs
SPL2SMA.003SMAP L2 Radar Half-Orbit 3 km EASE-Grid Soil MoistureKim, S., J. Van Zyl, R. S. Dunbar, E. G. Njoku, J. T. Johnson, M. Moghaddam, and L. Tsang.SMAP L2 Radar Half-Orbit 3 km EASE-Grid Soil Moisture2016-04-29Boulder, Colorado USANASA NSIDC DAAC: NASA National Snow and Ice Data Center Distributed Active Archive Center3false10.5067/J8SGO1E0Y9XZhttps://doi.org/10.5067/J8SGO1E0Y9XZSPL2SMATechnical ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-61991-303-492-2468CIRES, 449 UCBUniversity of ColoradoBoulderCO80309-0449USAEARTH SCIENCESPECTRAL/ENGINEERINGRADARSIGMA NAUGHT EARTH SCIENCELAND SURFACESOILSSOIL MOISTURE/WATER CONTENT SOIL MOISTUREClimatology/Meteorology/AtmosphereGeoscientific InformationEASE-Grid SM-projectRadarSMAP-projectSMAP-project-L2Soil MoistureSoil Moisture Active PassiveSMAP L-Band RadarSMAP L-Band RadarSMAP ObservatorySoil Moisture Active and Passive Observatory2015-04-132015-07-07complete-85.04485.044-180180Geographic RegionGlobal Land3 km3 km49 minuteSMAPSoil Moisture Active PassiveSMAP products provide multiple means to assess quality. Each product contains bit flags, uncertainty measures, and file-level metadata that provide quality information. For information regarding the specific bit flags, uncertainty measures, and file-level metadata contained in this product, refer to the Data Fields and Metadata Fields documents.
Each HDF5 file contains metadata with Quality Assessment (QA) metadata flags that are set by the Science Data Processing System (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.
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.These 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/use_copyright.html. 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 ColoradoBoulderCO80309-0449USAHTTPS1.5 GBHDF5FTP1.5 GBHDF5Bolten, J., V. Lakshmi, and E. Njoku. 2003. Soil Moisture Retrieval Using the Passive/Active L- and S-band Radar/Radiometer. IEEE Trans. Geosci. Rem. Sens., 41:2792-2801.
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.
Brodzik, M. J., B. Billingsley, T. Haran, B. Raup, and M. H. Savoie. 2014. Correction: Brodzik, M. J. et al. EASE-Grid 2.0: 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.
Dunbar, R. S., and S. B. Kim. 2016. SMAP Level 2 Active Soil Moisture (SPL2SMA) Product Specification Document. SMAP Project, JPL D-72546. Jet Propulsion Laboratory, Pasadena, CA. (http://nsidc.org/data/docs/daac/smap/sp_l2_sma/pdfs/D-72546_SMAP_ SPL2SMA_PSD_12082015_wo-sigs.pdf, 473 KB)
Dunbar, R. S., and S. B. Kim. 2014. SMAP Level 2 Active Soil Moisture (SPL2SMA) Product Specification Document. SMAP Project, JPL D-72546. Jet Propulsion Laboratory, Pasadena, CA. (http://nsidc.org/data/docs/daac/smap/sp_l2_sma/pdfs/D-72546_SMAP_ SPL2SMA_PSD_12082015_wo-sigs.pdf, 473 KB)
Entekhabi, D. et al. 2014. SMAP Handbook–Soil Moisture Active Passive: Mapping Soil Moisture and Freeze/Thaw from Space. Pasadena, CA USA: SMAP Project, JPL CL#14-2285, Jet Propulsion Laboratory.
Jackson, T. J., H. McNairn, M. A. Weltz, B. Brisco, and R. Brown. 1997. First Order Surface Roughness Correction of Active Microwave Observations for Estimating Soil Moisture. IEEE Trans. Geosci. Remo te Sens. 35:1065-1069.
Kim, S. B., J. van Zul, T. Jackson, and A. Colliander. 2015. Soil Moisture Active Passive (SMAP) Project Calibration and Validation for the L2/3_SM_A Beta-Release Data Products. SMAP Project, JPL D-XXXX. Jet Propulsion Laboratory, Pasadena, CA. (http://nsidc.org/data/docs/daac/smap/sp_l2_sma/pdfs/L2L3SMA_Assessment_Report151024.pdf, 673 KB)
Kim, S. B., J. Oullette, J. J. van Zyl, and J. T. Johnson. 2015 (In revision).Dual-Copolarized Approach to Detect Surface Water Extent Using L-Band Radar. IEEE Trans. Geosci. Remote Sens.
Kim, S. B., M. Moghaddam, L. Tsang, M. Burgin, X. Xu, and E. G. Njoku. 2014. Models of L-band radar backscattering coefficients over the global terrain for soil moisture retrieval. IEEE Trans. Geosci. Remote Sens., vol. 52, pp. 1381-1396, 2014.
Kim, S. B., J. van Zyl, S. Dunbar, E. Njoku, J. Johnson, M. Moghaddam, J. Shi, and L. Tsang. 2014. SMAP Algorithm Theoretical Basis Document: L2 & L3 Radar Soil Moisture (Active) Products. SMAP Project, Jet Propulsion Laboratory, Pasadena, CA. (http://nsidc.org/data/docs/daac/smap/sp_l2_sma/pdfs/276_L2_3_SM_A_RevA_web.pdf, 5.4 MB)
Kim, S. B., L. Tsang, J. T. Johnson, S. Huang, J. J. van Zyl, and E. G. Njoku. 2012. Soil moisture retrieval using time-series radar observations over bare surfaces. IEEE Trans. Geosci. Remote Sens., 50:1853-1863.
Kim, Y., and J. J. van Zyl. 2009. A Time-Series Approach to Estimate Soil Moisture Using Polarimetric Radar Data. IEEE Trans. Geosci. Remote Sens. 47:2519-2527.
Kim, Y., and J. J. van Zyl. 2000. On the Relationship Between Polarimetric Parameters. IEEE Geoscience and Remote Sensing Symposium. Hawaii, USA.TBDThis Level-2 (L2) soil moisture product provides estimates of global land surface conditions retrieved by the Soil Moisture Active Passive (SMAP) active radar during 6:00 a.m. descending half-orbit passes, as well as ancillary data such as surface temperature and vegetation water content. Input backscatter data used to derive soil moisture are resampled to an Earth-fixed, global, cylindrical 3 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0).VIEW RELATED INFORMATIONhttps://doi.org/10.5067/J8SGO1E0Y9XZDocumentationGET DATAhttps://n5eil01u.ecs.nsidc.org/SMAP/SPL2SMA.003/HTTPSGET DATAhttps://search.earthdata.nasa.gov/search?q=SPL2SMA+V003Earthdata SearchGET DATAhttps://nsidc.org/data/data-access-tool/SPL2SMA/versions/3/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_l2_sma/pdfs/L2&3_SM_A_RevB_web151031.pdfAlgorithm Theoretical Basis Document (ATBD)CEOS IDN DIFVERSION 9.92016-04-292023-11-29NSIDCVersion SummaryChanges to this version include:
<ul><li>Transitioned to Validated-Stage 1</li>
<li>Uses updated SPL1CS0 V3 as input</li>
<li>Updates to some of the data cubes</li>
<li>Update of crop database</li>
<li>Modified iterative bias correction</li>
<li>Estimation of VWC</li>
</ul>
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 VersionR13080Changed with Version 3 update. 2015-04-132015-07-070NSIDCCurrent Version1NSIDCSpatial Reference SystemsEPSG:6933WGS 84 / NSIDC EASE-Grid 2.0 GlobalNSIDCLevel of ServiceComprehensiveNSIDCFull Dataset CitationKim, S., J. Van Zyl, R. S. Dunbar, E. G. Njoku, J. T. Johnson, M. Moghaddam, and L. Tsang. 2016. <i>SMAP L2 Radar Half-Orbit 3 km EASE-Grid Soil Moisture.</i> Version 3. [indicate subset used]. Boulder, Colorado USA: NASA National Snow and Ice Data Center Distributed Active Archive Center. <a href="https://doi.org/10.5067/J8SGO1E0Y9XZ">https://doi.org/10.5067/J8SGO1E0Y9XZ</a>. [Date Accessed].NSIDCRetiredfalseNSIDCRelated 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. 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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+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. 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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 INFORMATIONFilter and order from a data set web pagePublicationURLDATA 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 DAAC2020-07-06T00:00:00.000ZChromeFirefoxSafariSee https://bitbucket.org/nsidc/everest-ui/src/master/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/SPL2SMA/versions/3/