Environmental data, to ascertain the status of environment at district/state/national levels and to facilitate decision-making at all levels of government, Ministry, for the first time, has embarked on conducting the National Environment Survey at regular intervals. ENVIS Hubs/ ENVIS resource partner will collect/generate data/information/maps from the district level. While data gaps identified in the secondary data will be filled in through primary survey, which will be carried out in the selected representative grids. All the data/information/maps will be generated from the district level to facilitate policy decisions at all levels of government. On a pilot scale, ENVIS HUB carried out GRIDSS in Thiruvallur district and prepared seventeen sectoral GRID based maps.