1. Department of Photogrammetry and Geoinformatics, Lviv Polytechnic National University, 12 S. Bandery Str., 79013 Lviv, Ukraine
2. Institute of Geophysics Polish Academy of Sciences, 64 Księcia Janusza Str., 01-452 Warszawa, Poland
3. Faculty of Geodesy and Cartography, Warsaw University of Technology, 1 Sq. Politechniki, 00-661 Warsaw, Poland