The SMAP Level-2 and Level-3 standard and enhanced radiometer soil moisture data sets, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), have been updated. The optional Dual Channel Algorithm (DCA) in the Level-2 products has been replaced by the Modified Dual Channel Algorithm (MCDA). The baseline algorithm (SCA-V) remains unchanged for both Level-2 and Level-3 products. Other primary changes include:
- Level-2: the following data fields were removed: soil_moisture_option4, vegetation_opacity_option4, retrieval_qual_flag_option4, soil_moisture_option5, vegetation_opacity_option5, retrieval_qual_flag_option5.
- Level-2: the following data fields were added: albedo_option3, roughness_coefficient_option3, bulk_density, clay_fraction.
- Level-3: the following data fields were added: bulk_density, clay_fraction, bulk_density_pm, clay_fraction_pm.
The NSIDC DAAC provides access to documentation and these data sets from the following locations:
SMAP L2 Radiometer Half-Orbit 36 km EASE-Grid Soil Moisture, Version 6 Data set DOI: https://doi.org/10.5067/R50VUC07OM4W SMAP Enhanced L2 Radiometer Half-Orbit 9 km EASE-Grid Soil Moisture, Version 3 Data set DOI: https://doi.org/10.5067/017XZSKMLTT2 SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture, Version 6 Data set DOI: https://doi.org/10.5067/EVYDQ32FNWTH SMAP Enhanced L3 Radiometer Global Daily 9 km EASE-Grid Soil Moisture, Version 3 Data set DOI: https://doi.org/10.5067/T90W6VRLCBHI