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The Soil Moisture Active Passive (SMAP) mission is one of the first Earth observation satellites being developed by NASA in response to the National Research Council's Decadal Survey  . Its mission design consists of L-band radiometer and radar instruments sharing a rotating 6-m mesh reflector antenna to provide high-resolution and highaccuracy global maps of soil moisture and freeze/thaw state every 2-3 days. The combined active/passive microwave soil moisture product will have a spatialdoi:10.1109/igarss.2010.5652291 dblp:conf/igarss/ONeillENK10 fatcat:azquozvhubezba5vboglmekuci