1. Department of Computer Science, Computergraphics, Technical University of Dortmund 1 , Otto-Hahn-Straße 16, 44227 Dortmund, Germany
2. Institute for Urban Public Health, University Hospital Essen, University Duisburg-Essen 2 , Hufelandstraße 55, 45147 Essen, Germany
3. Department of Landscape Ecology and Landscape Planning, School of Spatial Planning, Technical University of Dortmund 3 , August-Schmidt-Straße 10, 44227 Dortmund, Germany