1. Department of Geoscience and Remote Sensing Delft University of Technology Delft The Netherlands
2. Laboratoire de Glaciologie Université libre de Bruxelles Brussels Belgium
3. Laboratory of Hydraulics, Hydrology and Glaciology (VAW) ETH Zürich Zürich Switzerland
4. Swiss Federal Institute for Forest, Snow and Landscape Research (WSL) Birmensdorf Switzerland
5. Department of Geosciences University of Fribourg Fribourg Switzerland