1. Geocomputing Laboratory, University of Calgary, Calgary, Alberta T2N 1N4, Canada
2. Planning and Development Research Center (CRAD), Laval University, Quebec G1K 7P4, Canada
3. Geocomputing Laboratory, Department of Geomatics Engineering, Schulich School of Engineering, University of Calgary, 2500 University Drive NW Calgary, Alberta T2N 1N4, Canada