1. University of Calgary, 2129, Geomatics Engineering, Calgary, Alberta, Canada;
2. York University, Earth and Space and Engineering, Room 149, Petrie Science & Engineering Building, 4700 Keele Street, Toronto, Ontario, Canada, M3J 1P3,
3. Room 149, Department of Earth and Space Science and EngineeringCanada;
4. CARTEL et Université de Sherbrooke, Géomatique appliquée, Sherbrooke, Quebec, Canada, ;
5. Centre de Géomatique du Québec, 534 Jacques-Cartier Est, g7h1z6, Chicoutimi, Quebec, Canada, G7H1Z6, ;