[G02-P] Poster

[G02-P-15] Evaluation of the gravity and altimetry data in the Baltic Sea region and computation of the new quasi-geoid model for the territory of Poland

Adam Lyszkowicz¹, ^○Joanna Kuczynska-Siehien² (1.Polish Air Forces Academy, Department of Air Navigation, Deblin, Poland, 2.University of Warmia and Mazury in Olsztyn, Faculty of Geodesy, Geospatial and Civil Engineering, Olsztyn, Poland)

The gravimetric quasi-geoid models in Poland were computed using FFT, collocation and KTH methods. In all cases the same gravity data from the southern part of the Baltic Sea, geopotential model EGM2008, and the same digital terrain model, were used. The accuracy of the computed models was estimated using GPS/levelling data from the POLREF network.
Marine gravity anomalies used in the quasi-geoid model computations cover the very limited southern part of the Baltic Sea. The currently available gravity data from the satellite altimetry, e.g. the DNSC08GRA global marine gravity field, are covering the whole Baltic Sea. The usage of this data source should improve the quality of existing quasi-geoid models.
The first aim of the work is the comparison and validation of gravity anomalies from the DNSC08GRA model and the shipborne gravity anomalies along the Polish coast and in the Gulf of Bothnia. The next step, is the computation of new gravimetric quasi-geoid model for the territory of Poland, using gravity data from the satellite altimetry, the EIGEN-6C4 and GECO geopotential models, and the chosen DTM. The accuracy of the computed new model is estimated using the high precision ASG-EUPOS network connected to the new vertical datum PL-EVRF2007-NH.