1. Department of Geography; University of Zurich; Winterthurer Str. 190 8057 Zürich Switzerland
2. Institute for Cartography; Technische Universität Dresden; 01069 Dresden Germany
3. Geodynamics Department; DTU Space; Elektrovej, Building 328, 2800 Kgs. Lyngby Denmark
4. Centre for Ice and Climate, NBI; University of Copenhagen; Juliane Maries Vej 30 2100 Copenhagen Denmark
5. Danish Climate Centre; DMI; Lyngbyvej 100 2100 Copenhagen Denmark
6. Geological Survey of Denmark and Greenland (GEUS); Voldgade 10 1350 Copenhagen Denmark