SMAP L4 9 km EASE-Grid Surface and Root Zone Soil Moisture Analysis Update, Version 2

SMAP Level-4 (L4) surface and root zone soil moisture data are provided in three products: SMAP L4 9 km EASE-Grid Surface and Root Zone Soil Moisture Geophysical Data (SPL4SMGP) SMAP L4 9 km EASE-Grid Surface and Root Zone Soil Moisture Analysis Update (SPL4SMAU) SMAP L4 9 km EASE-Grid Surface and Root Zone Soil Moisture Land Model Constants (SPL4SMLM) For each product, SMAP L-band brightness temperature data from descending and ascending half-orbit satellite passes (approximately 6:00 a.m. and 6:00 p.m. local solar time, respectively) are assimilated into a land surface model that isgridded using an Earth-fixed, global, cylindrical 9 km Equal-Area ScalableEarth Grid, Version 2.0 (EASE-Grid 2.0) projection.