1. Faculty of Geoengineering, University of Warmia and Mazury in Olsztyn, 2 Oczapowskiego St., Olsztyn, 10-719, Poland
2. Institute of Geodesy and Cartography (IGiK), Centre of Geodesy and Geodynamics, 27 Modzelewskiego St., Warsaw, 02-679, Poland
3. Department of Geological Sciences and Geological Engineering, Queen's University, Kingston, Ontario, K7L 3N6, Canada