MODIS - Advanced facility instrument for studies of the earth as a system

Computer Science

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Earth Observing System (Eos), Imaging Spectrometers, Optical Equipment, Polar Orbits, Signal To Noise Ratios, Spectral Resolution, Ice, Mercury Cadmium Tellurides, Noaa Satellites, Snow, Thematic Mapping, Vegetation

Scientific paper

The moderate resolution imaging spectrometer (MODIS) is discussed as an earth-viewing sensor that is planned as a facility instrument for the Earth Observing System (EOS) scheduled to begin functioning in the mid-1990s. The MODIS is composed of two mutually supporting sensors that cover a swath width sufficient to provide nearly complete two-day global coverage from a polar-orbiting, sun-synchronous, serviceable platform. High signal-to-noise ratios are to be provided, e.g., 500 to 1 or greater with 10-12-bit quantization over the dynamic ranges of the spectral bands. MODIS' lifetime is expected to be about ten years. One of the MODIS sensors is termed MODIS-N, where N signifies nadir-viewing. The companion to MODIS-N is MODIS-T, where T signifies a tiltable field-of-view. The development of the MODIS facility from conceptual design studies (Phase-A) into detailed design studies (Phase-B) is discussed.

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