The design of the Global Imager (GLI) on board the ADEOS-Il satellite is discussed to realize an efficient radiometer for monitoring the earth's surface and lower atmosphere. The GLI has 36 channels allocated over a wide spectral range between 0.38 Jim and 12 tm for retrieving various geophysical parameters important for climate system studies, such as cloud and aerosol microphysical parameters, ocean color pigments, vegetation indices, snow/ice microphysical parameters, and so on. Land surface and cloud detections are further enhanced by its six 250 m channels spectrally similar to LANDSAT/TM channels. The science issues relevant for the GLI mission are also briefly discussed.

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