1. German Remote Sensing Data Center (DFD), German Aerospace Center (DLR), 82234 Wessling, Germany
2. Fabrikschleichach, Department of Animal Ecology and Tropical Biology, Biocenter, University of Würzburg, Glashüttenstraße 5, 96181 Rauhenebrach, Germany
3. Nationalpark Bavarian Forest, Freyunger Str. 2, 94481 Grafenau, Germany
4. Institute for Geography and Geology, University of Wuerzburg, 97074 Wuerzburg, Germany