1. Professor, Faculty of Social and Technical Sciences, Dept. of Geodesy, Univ. of Lower Silesia, Wagonowa 9, Wrocław, 53-609, Poland (corresponding author).
2. Assistant Professor, Faculty of Civil and Environmental Engineering, Dept. of Civil Engineering, Warsaw Univ. of Life Sciences, SGGW, Nowoursynowska 159, Warsaw, 02-776, Poland.
3. Assistant Professor, Faculty of Geography and Regional Studies, Dept. of Geoinformatics, Cartography and Remote Sensing, Univ. of Warsaw, Krakowskie Przedmiescie 30, Warsaw, 00-927, Poland.