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NASA's Soil Moisture Active Passive (SMAP) mission launched on January 31, 2015 into a sun-synchronous 6 am/6 pm orbit with an objective to produce global mapping of high-resolution soil moisture and freeze-thaw state every 2–3 days using an L-band (active) radar and an L-band (passive) radiometer. The SMAP radiometer began acquiring routine science data on March 31, 2015 and continues to operate...
In this paper, we describe our approach to simulate realistic L-band brightness temperatures to be measured by the Soil Moisture Active Passive (SMAP) mission. These realistic simulated measurements are crucial because they provide a quantitative basis by which we develop and improve our pre-launch retrieval algorithms for soil moisture at 9-km and 36-km spatial scales.
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