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Preliminary Level-2 and Level-3 SMAP Radiometer Data Now Available

Preliminary Level-2 and Level-3 SMAP Radiometer Data Now Available

The beta version of Level-2 (L2) and Level-3 (L3) radiometer data from NASA’s Soil Moisture Active Passive (SMAP) mission is now available at the NASA National Snow and Ice Data Center (NSIDC) Distributed Active Archive Center (DAAC). These data use L-band brightness temperature measurements retrieved from the SMAP radiometer to produce global soil moisture estimates.

As of September 9, 2015, the SMAP Science Data System (SDS) began forward processing of the beta (Version 1) L2 and L3 radiometer data, which will be made available at the NSIDC within 24 hours of satellite observation for the L2 data, and within 50 hours for the L3 data. Note that reprocessing of the data from March 31, 2015, to September 9, 2015, to Version 1 will begin at the end of October 2015.

The beta (Version 1) SMAP L2 and L3 datasets now available at the NSIDC include:

• SMAP L2 Radiometer Half-Orbit 36 km EASE-Grid Soil Moisture; Digital Object Identifier (DOI):
• SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture; DOI:

Users should be aware that these beta data use preliminary algorithms that are still being validated and are thus subject to uncertainties. The calibrated and validated release (Version 2) of these L2 and L3 datasets is expected to take place at the end of April 2016.

To access data, documentation, and tools, visit

Note also that the Level-1 SMAP radar data are accessible through the Alaska Satellite Facility Center DAAC at

Additional questions can be directed to NSIDC User Services at