All radiometer data products from NASA’s Soil Moisture Active Passive (SMAP) mission are now available at the National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). SMAP combines coincident L-band radar and radiometer measurements to produce global, high-resolution soil moisture and freeze/thaw estimates.

The SMAP Science Data System (SDS) has generated the Validated version of Level-1 radiometer data and the Beta version of Level-2, -3, and -4 radiometer data. Users should be aware that the Level-2, -3, and -4 Beta data use preliminary algorithms that are still being validated and are thus subject to uncertainties.

The SMAP radiometer data products in this release include the following:
- Level-1 telemetry and brightness temperatures
- Level-2 and -3 soil moisture (passive only)
- Level-4 model-derived surface and root zone soil moisture and carbon net ecosystem exchange

The SMAP radar and combined radar/radiometer data products will be released in the near future.

To access data, documentation, and tools, please see the SMAP Web site at the NSIDC DAAC:

Data Acknowledgements
Data center: NSIDC DAAC (
Sponsor: NASA EOSDIS (

If you have questions, please contact the User Services Office at

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