![]() Further, the values have been compared with those obtained from the recent GOCE–GRACE–LAGEOS geoid model EIGEN6C3stat. Orthometric height of stations from developed model have been found to be near to those from field levelling which is considered most accurate. GPS observations were taken using dual frequency geodetic GPS receivers and leveling done using digital levels with 0.1 mm accuracy. Observations were taken in a network of sixteen stations spread over 600 km 2 around Dehra Dun, India. In this study, an attempt has been made to develop a geoid model using the geometric method. Thus, to make use of GNSS in engineering surveying, the relationship between ellipsoidal height and orthometric height as a function of position needs to be established through geoid modeling. ![]() Engineering projects require orthometric heights of points where as Global Navigation Satellite System (GNSS) provide height above ellipsoid. ![]()
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