Geoid determination in Serbia

Abstract

At the end of 2003, a preliminary geoid of Serbia was determined by fitting the gravimetric geoid into undulations determined by GPS and leveling (GPS/dh) techniques. The gravimetric geoid was determined using data from regional gravimetric survey in Serbia (13,326 points) by applying collocation within the remove-restore method, and undulations GPS/dh (in total, 53 undulations) refer to ETRS89 as well as to the height datum defined by the second leveling network of height of high precision (NVT2). Comparing the gravimetric geoid to the GPS/dh undulations shows that there are differences ranging from -20 cm to -90 cm that are relatively regularly distributed in an east-west direction. Of the total of 53 GPS/dh undulations, 18 were used for fitting the gravimetric geoid and 35 for external checking. This check shows that the remaining discrepancies range from -9 cm to 14 cm, with an average value of 1.3 cm and a standard deviation of 7.7 cm.