1. 1 Faculty of Geoengineering , University of Warmia and Mazury in Olsztyn , Michała Oczapowskiego 2, 10-719 Olsztyn , Poland
2. 2 Institute of Geodesy and Construction, Faculty of Geoengineering , University of Warmia and Mazury in Olsztyn , ul. Michała Oczapowskiego 2, 10-719 Olsztyn , Poland