1. Institute of Geodesy, Faculty of Geodesy, Geospatial and Civil Engineering, University of Warmia and Mazury in Olsztyn, Oczapowski St. 1, 10–719 Olsztyn, Poland
2. Institute of Mining, Faculty of Mining and Geology, Silesian University of Technology, Akademicka St. 2, Gliwice, Poland
3. Department of Geodesy, Gdansk University of Technology, Narutowicza St. 11/12, Gdansk, Poland
4. Programmer, Herzogstandstr. 142, 85435 Erding, Germany