CREATION OF A DIGITAL TOPOGRAPHIC MODEL IN EXTREME AREAS ON THE TERRITORY OF SOUTH-WESTERN BULGARIARILA MOUNTAIN

Abstract

The subject of the research is to create a digital topographic model (DTM) on the territory of Rila Mountain in order to further local modeling of the geoid. The data obtained from this model, in the form of planar and altitude coordinates, are used to determine the terrain correction and calculate the complete Bougue anomalies. The information from the DTM in terms of altitude can serve as an initial value of the normal altitude in the interpolation calculations and determination of the transformation parameters when filling in the data for modelling the geoid (quasi-geoid).