Quality Assessment ReportsCollectionsSMAPDataset Id and VersionSPL4SMAU2SPL4SMGP2SPL4SMLM2SPL4SMAU3SPL4SMGP3SPL4SMLM3Assessment of the SMAP Level-4 Surface and Root-Zone Soil Moisture Product Using In Situ MeasurementsData Programnasa_nsidc_daac