Affiliation: | 1. Applied Geomatics Research Group, Centre of Geographic Sciences, 50 Elliot Rd. Lawrencetown, Nova Scotia, B0S 1M0;2. Department of Geoscience, University of Calgary, Calgary Alberta T2N 1N4;3. Department of Geography, University of Lethbridge, 4401 University Drive West, Lethbridge, Alberta T1K 3M4 |