HEIGHT REFERENCE OF TERRAIN RELIEFS

The accuracy and resolution of real topographic heights in the terrain reliefs has a special importance in meteorology, hydrology and other Earth’s disciplines dealing with dynamical processes on regional scale. The accuracy of topographic height referencing of a region composed from several areas with independent national geodetic networks depends on the homogeneity of the applied measuring processes and geodetic datum on these areas. The territories falling out of homogeneity can be revealed by comparing their leveled height data to topographic heights produced from GPS measurements. The difference indicate either local gravity anomalies or height datum problem. Two territories were selected (one in Hungary and one in Greece) to demonstrate this method what revealed a height datum problem on the Greek area.