1. Department of Physical Geography, Institute of Geography and Geology, University of Wurzburg, D-97074 Wurzburg, Germany
2. Department of Remote Sensing, Institute of Geography and Geology, University of Wurzburg, D-97074 Wurzburg, Germany
3. Institute of Environmental Social Sciences and Geography, University of Freiburg, D-79085 Freiburg im Breisgau, Germany
4. German Remote Sensing Data Center (DFD), German Aerospace Center (DLR), Muenchener Strasse 20, D-82234 Wessling, Germany
5. Geoinformatics Department, Munich University of Applied Sciences, Karlstraße 6, D-80333 Munich, Germany