1. Institute of Applied Remote Sensing and Information Technology, College of Environmental and Resource Sciences, Zhejiang University; 866 Yuhangtang Road Hangzhou 310058 China
2. Department of Bioresource Engineering; McGill University; 21,111 Lakeshore Road Montreal H9X 3V9 Canada
3. CSIRO Land and Water, Bruce E. Butler Laboratory; GPO Box 1666 Canberra Australian Capital Territory 2601 Australia