1. Geophysical Institute, University of Alaska Fairbanks, Fairbanks, USA
2. Center for Remote Sensing of Land Surfaces, Bonn University, Bonn, Germany
3. Department of Earth Sciences, Air, Water and Landscape Science, Uppsala University, Sweden
4. Department of Geography, RWTH Aachen University, Aachen, Germany
5. Department of Ecology, Technische Universität Berlin, Berlin, Germany