THE CEOS DATABASE : Missions, Instruments and Measurements
CEOS EO HANDBOOK – INSTRUMENT SUMMARY - TMI -
Full Name TRMM Microwave Imager Status No longer operational
Instrument Agencies NASA Maturity
Instrument Type Imaging multi-spectral radiometers (passive microwave) Geometry
Instrument Technology Multi-purpose imaging MW radiometer Sampling Imaging
Data Access Open Access Data Format HDF
Measurements and Applications Measures rainfall rates over oceans (less reliable over land), combined rainfall structure and surface rainfall rates with associated latent heating. Used to produce monthly total rainfall maps over oceans.
Resolution Summary Vertical: 2.5 km approx; Horizontal: 18 km
Swath Summary 790 km
Accuracy Summary Liquid water: 3 mg/cm3, Humidity: 3 mg/cm3, Ocean wind speed: 1.5 m/s
Waveband Summary Microwave: 10.7 GHz, 19.4 GHz, 21.3 GHz, 37 GHz, and 85.5 GHz
MW (~1.0 cm - ~100 cm)
Instrument Measurements
CategoryParameterAccuracy
Atmospheric Humidity FieldsAtmospheric specific humidity (TC) 
Cloud particle properties and profileCloud liquid water (TC) 
Precipitation Profile (liquid or solid) 
Cloud ice (column/profile) 
Liquid water and precipitation ratePrecipitation rate (liquid) at the surface 
Ocean surface windsWind speed over sea surface (horizontal) 
Soil moistureSoil moisture at the surface 
Surface temperature (ocean)Sea surface temperature 
Instrument Missions
TRMM - Tropical Rainfall Measuring Mission (1997 - 2015)
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