This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Radosław Cellmer
Faculty of Geodesy and Land Management University of Warmia and Mazury in Olsztyn
Katarzyna Szczepankowska
of Geodesy and Land Management University of Warmia and Mazury in Olsztyn