Dr. Roy is an Earth Observation and Spatial Ecology expert who has pioneered generation of information on natural resources and services using Earth Observation Systems for both India and global programs, inspiring many young scientists of this era. One of his finest contributions that added a new paradigm in disaster risk assessment and reduction was establishing the National Database for Emergency Management (NDEM). This severed the Prime Minister’s Office, Ministry of Home Affairs, different states and relevant institutions. He went on to establish a first-of-its-kind 24X7 Decision Support Centre (DSC) at National Remote Sensing Centre, Hyderabad. At the behest of the erstwhile Planning Commission, Government of India, Dr. Roy developed a unique project titled, “Space based Information Support for Decentralised Planning” intended toward inclusion of people from the grass root in planning and information collection and dissemination using geo-informatics and IT tools. He was a member of High Level Working Group on Western Ghats that facilitated geospatial analysis to determine Eco sensitive Zones.