1. Geodetic Research Division, Lantmäteriet, 801 82 Gavle, Sweden
2. Geodetic Institute, Norwegian Mapping Authority, 3507 Hønefoss, Norway
3. Faculty of Science and Technology (RealTek), Norwegian University of Life Sciences (NMBU), 1433 Ås, Norway
4. Finnish Geospatial Research Institute, National Land Survey of Finland, 02430 Masala, Finland
5. National Space Institute, Technical University of Denmark (DTU Space), 2800 Kgs. Lyngby, Copenhagen, Denmark
6. Department of Geodesy, Estonian Land Board, 10621 Tallinn, Estonia
7. Institute of Geodesy, Leibniz Universität Hannover (LUH), 30167 Hannover, Germany