NEW DELHI: In 15 months time, Survey of India, the country’s principal mapping agency, will map the entire stretch of the Ganga using geographic information system (GIS) technology and provide high-resolution maps to the government. It will help river cleaning authorities in getting minute details of sewage and effluent discharge outlets and identify pollution hot-spots up to 10 km on both sides of the river. “The high resolution map will help us in keeping tabs on sources of pollution and taking quick corrective measures. Such scientific map is necessary for effective execution and monitoring of the river cleaning works,” said Rajeev Ranjan Mishra, director general of the National Mission for Clean Ganga (NMCG).