1. 3D Geospatial Data Processing Group (3DGeo)Institute of Geography, Heidelberg University 69120 Heidelberg Germany
2. Interdisciplinary Centre for Scientific Computing (IWR)Heidelberg University 69120 Heidelberg Germany
3. Alfred Wegener Institute (AWI), Helmholtz Centre for Polar and Marine Research 14473 Potsdam Germany
4. Geography DepartmentHumboldt University 10099 Berlin Germany
5. Cold Regions Research CentreWilfrid Laurier University Waterloo N2L 3C5 Canada
6. Heidelberg Centre for the Environment (HCE)Heidelberg University 69120 Heidelberg Germany