Linus Shihora¹, Marius Schlaak², Rory J Bingham³, Henryk Dobslaw¹ and Roland Pail⁴, (1)Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany, (2)Technical University of Munich, Chair of Astronomical and Physical Geodesy, Munich, Germany, (3)University of Bristol, School of Geographical sciences, Bristol, United Kingdom, (4)TU München, MüNchen, Germany