[1] Swiss Fed Inst Technol, Lab Hydraul Hydrol & Glaciol VAW, Zurich, Switzerland
[2] Swiss Fed Inst Technol, Inst Geophys, Zurich, Switzerland
[3] Terra Vermessungen AG, Othmarsingen, Switzerland
[4] Geol Survey Finland GTK, Espoo, Finland
[5] Swiss Fed Inst Forest Snow & Landscape Res WSL, Birmensdorf, Switzerland