1. Faculty of Physics, Ludwig-Maximilians-Universität München, Schellingstraße 4, 80799 Munich, Germany
2. Department of Civil and Environmental Engineering Sciences, Technische Universität Darmstadt, Karolinenplatz 5, 64283 Darmstadt, Germany
3. Laboratory of Geo-information Science and Remote Sensing, Wageningen University and Research, Droevendaalsesteeg 3, 6708PB Wageningen, The Netherlands
4. Potsdam Institute for Climate Impact Research, PO Box 60 12 03, Potsdam 14412, Germany
5. Department of Physics, Humboldt University of Berlin, Newtonstrasse 15, Berlin 12489, Germany