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+ How do I access Soil Moisture Active Passive (SMAP) mission data?

SMAP data and data products are distributed by two different NASA Distributed Active Archive Centers (DAACs): the Alaska Satellite Facility (ASF) and National Snow and Ice Data Center (NSIDC)

SMAP radar data is only distributed by ASF and can be accessed here (registration is required for download). SMAP radar data can be analyzed using MapReady. Note: there is only 2.5 months of collected radar data. 

All other SMAP datasets (radiometer data) and data products (soil moisture) are distributed by NSIDC.  A number of tools work with SMAP data, including ones included in ARSET trainings: