These are experimental products that are still being evaluated and improved. We encourage your specific, constructive feedback as this phase of development proceeds.
SMAP Level 3 soil moisture passive (L3_SM_P) data are products derived from NASA’s Soil Moisture Active Passive (SMAP) mission. L3_SM_P products are daily composites of Level 2 surface soil moisture passive (L2_SM_P) products that are based on satellite-based radiometer brightness temperature measurements sensitive to soil moisture. These measurements provide remote sensing of soil moisture in the top 5 cm of the soil column with an accuracy of ~0.04 m³/m³ over region <= to 5 kg/m2 vegetation-water-content. The L3_SM_P data have a resolution of 36 km and typically a 3-days revisit time. The NDMC will be producing composited maps of the difference between weekly mean soil moisture in one week, one month, and three months. The NDMC will also be posting GeoTiffs of these derived maps.
Entekhabi, D., S. Yueh, P. O¹Neill, K. Kellogg et al., SMAP Handbook, JPL Publication JPL 400-1567, Jet Propulsion Laboratory, Pasadena, California, 182 pages, 2014.
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