ESA Instrument Types Dictionary inspired from CEOS classification urn:ogc:def:dictionary:CEOS:eop:InstrumentTypes:v01 Instrument measuring radiation intensity in multiple narrow, precisely calibrated spectral channels. Imaging Multispectral Radiometer Instrument measuring radiation intensity from multiple view angles to reconstruct surface topography. Stereo Imaging Radiometer Instrument transmitting at frequencies of around 1 to 10GHz and measuring the backscattered signals to generate microwave images of Earth’s surface at high spatial resolutions (between 10m and 100m). Imaging Microwave Radar Ranging instrument measuring the radiation that is returned either from particles in the atmosphere or from the Earth’s surface when illuminated by a laser source. Lidar Non-imaging instrument which use the ranging capability of radar to measure the surface topographic profile parallel to the platform track. They provide precise measurements of the platform’s altitude by measuring the time interval between the transmission and reception of very short electromagnetic pulses. Radar Altimeters