India ’ s New Map Policy – Utility of Civil User

With the implementation of India’s new map policy user community is looking towards a transformation in the spatial database (from Everest 1830 ellipsoid, Polyconic projection system to WGS 84 ellipsoid, UTM projection system). To bring them on same platform, problem of existence of different transformation parameters has to be dealt with, since due to unavailability of such data from Survey of India. Secondly due to mismatch in the two datum error in registration of topographic database is obvious. This study aims at finding out the difference between two geodetic datum with different transformation parameters, and to determine the extent to which the existing database can be used without losing accuracy. Results show that there are some geographic locations whose topographic database can be used without the need of transformation and within the acceptable positional accuracy requirements, depending on the scale of toposheet.