1. Assistant Professor, Faculty of Geodesy and Cartography, Warsaw Univ. of Technology, Pl. Politechniki 1, 00-661, Warsaw, Poland (corresponding author).
2. Assistant Professor, Faculty of Geodesy and Cartography, Warsaw Univ. of Technology, Pl. Politechniki 1, 00-661, Warsaw, Poland.
3. Full Professor, Space Research Centre, Polish Academy of Sciences, Bartycka 18A, 00-716, Warsaw, Poland.