IRS-1A was the first remote sensing mission undertaken by the Indian Space Research Organization (ISRO). It was a half-operational, half-experimental mission to develop indigenous expertise in satellite imagery. IRS-1A was the first remote sensing mission undertaken by ISRO to provide imagery for various land-based applications. The mission's long-term objective was to develop indigenous remote sensing capability.
The IRS system is the largest constellation of remote sensing satellites for civilian use in operation today in the world, with 12 operational satellites. All these are placed in polar Sun-synchronous orbit and provide data in a variety of spatial, spectral and temporal resolutions. Indian Remote Sensing Programme completed its 25 years of successful operations on March 17, 2013.
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