A programme by the Indian Space Research Organization (ISRO) that began with the launch of satellite IRS-1A from Baikonur, Kazakhstan, on 17 March 1988, into a Sun-synchronous polar orbit. The IRS series comprises satellites that help map, monitor, and manage natural resources. There is now a constellation of eleven IRS operational satellites, the largest constellation for civilian use.
https://www.isro.gov.in/saga-of-indian-remote-sensing-satellite-system The Saga of Indian Remote Sensing Satellite System.