1. Department of Forest Resource Management; University of British Columbia; 2424 Main Mall Vancouver British Columbia V6T 1Z4 Canada
2. Remote Sensing Laboratories RSL; Department of Geography; University of Zurich - Irchel; Winterthurerstr. 190 Zurich CH-8057 Switzerland
3. Swiss Federal Institute for Forest; Snow and Landscape Research WSL; Zürcherstrasse 111 Birmensdorf CH-8903 Switzerland