THE CEOS DATABASE : Missions, Instruments and Measurements
Full Name Microwave Imaging Radiometer using Aperture Synthesis (MIRAS) Status Operational
Instrument Agencies ESA Maturity
Instrument Type Imaging multi-spectral radiometers (passive microwave) and Multiple direction/polarisation radiometers Geometry
Instrument Technology Multi-purpose imaging MW radiometer Sampling Imaging
Data Access Open Access Data Format
Measurements and Applications Objective is to demonstrate observations of sea surface salinity and soil moisture in support of climate, meteorology, hydrology, and oceanography applications.
Resolution Summary 33 - 50 km depending on the position in the swath - resampled to 15 km grid
Swath Summary Hexagon shape, nominal width 1050 km allowing a 3 day revisit time at the equator
Accuracy Summary 2.6 K absolute accuracy, RMS 1.6-4 K depending on the scene and the position within the swath
Waveband Summary L-Band 1.41 GHz
MW (~1.0 cm - ~100 cm)
L-Band (2 - 1 GHz)
Instrument Measurements
Ocean SalinityOcean salinity 
Soil moistureSoil moisture at the surface 
Instrument Missions
SMOS - Soil Moisture and Ocean Salinity (Earth Explorer Opportunity Mission) (2009 - 2017)
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