NASA LogoNTRSNTRS - NASA Technical Reports ServerSearchmore_vertCollectionsAboutNewsHelpLogin Back to ResultsTechnical Report Series on Global Modeling and Data AssimilationDuring the post-launch SMAP calibration and validation (Cal/Val) phase there are two objectives for each science data product team: 1) calibrate, verify, and improve the performance of the science algorithm, and 2) validate the accuracy of the science data product as specified in the science requirements and according to the Cal/Val schedule. This report provides an assessment of the SMAP Level 4 Surface and Root Zone Soil Moisture Passive (L4_SM) product specifically for the product's public beta release scheduled for 30 October 2015. The primary objective of the beta release is to allow users to familiarize themselves with the data product before the validated product becomes available. The beta release also allows users to conduct their own assessment of the data and to provide feedback to the L4_SM science data product team. The assessment of the L4_SM data product includes comparisons of SMAP L4_SM soil moisture estimates with in situ soil moisture observations from core validation sites and sparse networks. The assessment further includes a global evaluation of the internal diagnostics from the ensemble-based data assimilation system that is used to generate the L4_SM product. This evaluation focuses on the statistics of the observation-minus-forecast (O-F) residuals and the analysis increments. Together, the core validation site comparisons and the statistics of the assimilation diagnostics are considered primary validation methodologies for the L4_SM product. Comparisons against in situ measurements from regional-scale sparse networks are considered a secondary validation methodology because such in situ measurements are subject to upscaling errors from the point-scale to the grid cell scale of the data product. Based on the limited set of core validation sites, the assessment presented here meets the criteria established by the Committee on Earth Observing Satellites for Stage 1 validation and supports the beta release of the data. The validation against sparse network measurements and the evaluation of the assimilation diagnostics address Stage 2 validation criteria by expanding the assessment to regional and global scales.Document ID20160003392Acquisition SourceGoddard Space Flight CenterDocument TypeTechnical Memorandum (TM)AuthorsKoster, Randal D.*(NASA Goddard Space Flight Center Greenbelt, MD United States)*Reichle, Rolf H.*(NASA Goddard Space Flight Center Greenbelt, MD United States)*De Lannoy, Gabrielle J. M.*(Universities Space Research Association Columbia, MD, United States)*Liu, Qing*(Science Systems and Applications, Inc. Lanham, MD, United States)*Colliander, Andreas*(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)*Conaty, Austin*(Science Systems and Applications, Inc. Lanham, MD, United States)*Jackson, Thomas*(Agricultural Research Service Beltsville, MD, United States)*Kimball, John*(Montana Univ. Missoula, MT, United States)*Date AcquiredMarch 15, 2016Publication DateOctober 1, 2015Subject CategoryGeosciences (General)Report/Patent NumberGSFC-E-DAA-TN29650NASA/TM-2015-104606 /Vol. 40Funding Number(s)CONTRACT_GRANT: NNG12HP06CDistribution LimitsPublicCopyrightPublic Use Permitted.KeywordsubRMSEL4_SMSMAPAvailable DownloadsNameType20160003392.pdfSTIcloud_downloadcontent_copyvisibilityRelated RecordsThere are no records associated with this record.visibility_offNo Preview Available
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