1. Earth Science Section, Jet Propulsion Laboratory; California Institute of Technology; Pasadena CA 91109 U.S.A.
2. Radar Science and Engineering Section, Jet Propulsion Laboratory; California Institute of Technology; Pasadena CA 91109 U.S.A.
3. Ecology and Biodiversity; Vrije Universiteit Brussel; Brussels 1050 Belgium
4. Department of Biological Sciences; National University of Singapore; Singapore 117543 Singapore
5. Key Laboratory of Forest Ecology and Conservation, College of Forestry; Guangxi University; Nanning Guangxi 530004 China
6. Department of Geography; National University of Singapore; Singapore 117570 Singapore
7. Systems Ecology and Resource Management; Université Libre de Bruxelles; Brussels 1050 Belgium