1. Alfred Wegener Institute; Periglacial Research; Telegrafenberg A45 14473 Potsdam Germany
2. Integrated Remote Sensing Studio (IRSS); Faculty of Forestry; University of British Columbia; 2424 Main Mall Vancouver British Columbia V6T1Z4 Canada
3. Helmholtz Centre Potsdam (GFZ); German Research Centre for Geosciences; Telegrafenberg A17 14473 Potsdam Germany