indian remote sensing satellites (irs) series of earth observation satellites, built, launched , maintained isro. irs series provides remote sensing services country. indian remote sensing satellite system largest constellation of remote sensing satellites civilian use in operation today in world. satellites placed in polar sun-synchronous orbit , provide data in variety of spatial, spectral , temporal resolutions enable several programmes undertaken relevant national development. initial versions composed of 1 (a, b, c, d) nomenclature. later versions named based on area of application including oceansat, cartosat, resourcesat.
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