1. Department of Geography and Environmental Management, University of Waterloo, 200 University Avenue West, Building EV-1, Waterloo, Ontario N2L 3G1, Canada
2. Department of Geography, Environment and Geomatics, University of Ottawa, 60 University Pvt., Ottawa, Ontario K1N 6N5, Canada
3. Natural Resources Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada