Determination of the quasigeoid by solving the Neumann boundary value problem

Abstract

GPS data, gravimetric data and digital elevation models have been used for the determination of quasigeoid by solving the second (Neumann) geodetic boundary value problem (GBVP). Measured point gravity values and mean Bouguer gravity anomalies have been transformed into gravity disturbances using the ellipsoidal heights obtained from digital elevation models DMR50 (local digital elevation model for Slovakia, 100 m x 100 m grid), GTOPO30 and SRTM3 (global digital elevation models) combined with EGG97 quasigeoidal heights. In this paper we present our computation process starting from input data compilation and transformation, then describing the numerical solution to the second GBVP and finally testing and discussing the obtained results.