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The history of the development and utilization of LANDSAT satellites is summarized. Objectives of the LANDSAT D mission are listed and the capabilities of the 4-channel multispectral band scanner and the 7-channel radiometer (thematic mapper) to be carried on the satellite are described. Satellite components are illustrated and diagrams show the ground segment data management system, the data assessment system, and the operations control center. The flight segment of the mission and flight segment specifications are also described. Examples of digitally analyzed and enhanced imagery are included.