Validation of Soil Moisture Data Products From the NASA SMAP Mission
نویسندگان
چکیده
The National Aeronautics and Space Administration Soil Moisture Active Passive (SMAP) mission has been validating its soil moisture (SM) products since the start of data production on March 31, 2015. Prior to launch, defined a set criteria for core validation sites (CVS) that enable testing key SM accuracy requirement (unbiased root-mean-square error <0.04 m3/m3). approach also includes other (“sparse network”) in situ measurements, satellite products, model-based field experiments. Over past six years, SMAP have analyzed with respect these reference data, analysis approaches themselves scrutinized in an effort best understand products’ performance. Validation most recent Level 2 3 retrieval (R17000) shows L-band (1.4 GHz) radiometer-based record continues meet requirements. are generally consistent retrievals from European Agency Ocean Salinity mission, although there differences some regions. high-resolution (3-km) product, generated by combining Copernicus Sentinel-1 observations, performs within expectations. Currently, however, is limited availability 3-km CVS support extensive at this spatial scale. (version 5) 4 assimilation product providing surface root-zone complete spatio–temporal coverage 9-km resolution meets performance program will continue throughout life; future plans include expanding it forested high-latitude
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ژورنال
عنوان ژورنال: IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
سال: 2022
ISSN: ['2151-1535', '1939-1404']
DOI: https://doi.org/10.1109/jstars.2021.3124743