Rolf Dach¹, Inga Selmke², Arturo Villiger¹, Lars Prange¹, Stefan Schaer³, Dmitry Sidorov¹, Pascal Stebler¹, Daniel Arnold¹ and Adrian Jaeggi¹, (1)University of Bern, Astronomical Institute, Bern, Switzerland, (2)Technical University of Munich, Munich, Germany, (3)swisstopo, Wabern, Switzerland