The SMAPVEX19-21 Massachusetts and Millbrook Temporary Soil Moisture Network, Version 1 data sets, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), have been updated from a basic to a standard level of service.
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Massachusetts data set DOI: https://doi.org/10.5067/3LXL78PSKVXQ
Millbrook data set DOI: https://doi.org/10.5067/NXNJWN9933UI