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Validation of Soil Moisture Data Products From the NASA SMAP Mission

Abstract : 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, the mission defined a set of criteria for core validation sites (CVS) that enable the testing of the key mission SM accuracy requirement (unbiased root-meansquare error <0.04 m 3 /m 3). The validation approach also includes other ("sparse network") in situ SM measurements, satellite SM products, model-based SM products, and field experiments. Over the past six years, the SMAP SM products have been analyzed with respect to these reference data, and the analysis approaches themselves have been scrutinized in an effort to best understand the products' performance. Validation of the most recent SMAP Level 2 and 3 SM retrieval products (R17000) shows that the L-band (1.4 GHz) radiometer-based SM record continues to meet mission requirements. The products are generally consistent with SM retrievals from the European Space Agency Soil Moisture Ocean Salinity mission, although there are differences in some regions. The high-resolution (3-km) SM retrieval product, generated by combining Copernicus Sentinel-1 data with SMAP observations, performs within expectations. Currently, however, there is limited availability of 3-km CVS data to support extensive validation at this spatial scale. The most recent (version 5) SMAP Level 4 SM data assimilation product providing surface and root-zone SM with complete spatio-temporal coverage at 9-km resolution also meets performance requirements. The SMAP SM validation program
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https://hal-meteofrance.archives-ouvertes.fr/meteo-03512208
Contributor : Jean-Christophe CALVET Connect in order to contact the contributor
Submitted on : Wednesday, January 5, 2022 - 12:00:14 PM
Last modification on : Monday, May 16, 2022 - 8:20:31 AM
Long-term archiving on: : Wednesday, April 6, 2022 - 7:01:38 PM

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Andreas Colliander, Rolf Reichle, Wade T Crow, Michael H Cosh, Fan Chen, et al.. Validation of Soil Moisture Data Products From the NASA SMAP Mission. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, IEEE, 2022, 15, pp.364-392. ⟨10.1109/JSTARS.2021.3124743⟩. ⟨meteo-03512208⟩

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