THE CEOS DATABASE : Missions, Instruments and Measurements
Full Name L-band Synthetic Aperture Radar (SMAP) Status No longer operational
Instrument Agencies NASA Maturity
Instrument Type Imaging microwave radars Geometry Conical scanning
Instrument Technology Imaging radar (SAR) Sampling Other
Data Access Open Access Data Format HDF-5
Measurements and Applications High-resolution measurements of radar backscatter for global estimates of surface soil moisture and freeze/thaw states for climate modeling and weather prediction. The radar instrument stopped transmitting on 7 July 2015.
Resolution Summary <3 km spatial resolution over 70% of swath; 3 days temporal resolution. Soil moisture will be estimated at a resolution of 10 km and freeze-thaw state at a resolution of 1-3 km.
Swath Summary 40-deg constant incidence angle across the 1000 km swath
[Max Swath: 1000 km]
Accuracy Summary <1dB Co-polarization; <1.5 dB cross-polarization at 3 km resolution
Waveband Summary L-Band (1.2 GHz)
MW (~1.0 cm - ~100 cm)
L-Band (2 - 1 GHz)
Instrument Measurements
Soil moistureSoil moisture at the surface 
Instrument Missions
SMAP - Soil Moisture Active Passive (2015 - 2018)
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