SMAP L4 9 km EASE-Grid Surface and Root Zone Soil Moisture Geophysical Data, Version 1
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Thisdocument describes the SMAP Level-4 Surface and Root Zone Soil Moisture (SPL4SM) dataproduct, which consists of:
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, input SMAP L-bandbrightness temperatures 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.
Note: These data are Beta-release quality, meaning that they have not undergone full validation and may stillcontain significant errors.
