Impact of India's New Map Policy on Accuracy of GIS Theme

摘要

With the declaration of India's new map policy (NMP), user community is looking towards its impact on spatial accuracy of GIS theme maps arising out of transformation from existing system (Polyconic Projection on Everest 1830 spheroid datum) to Open series maps (OSM in UTM projection on WGS 84 ellipsoid) and vice versa. This results in registration error of existing maps with new maps. This study aims at finding out the impact of transformation on the spatial location and to determine the extent to which the existing theme layers can be used along with the new series maps without losing accuracy. Results show that there are some geographic regions in India whose GIS database can be used as it is available, depending on the scale and within the acceptable positional accuracy. For other region, depending on the scale of theme layers, a detail analysis of the situation will be required depending on project requirements.