Jaakko Mäkinen (1), Ivars Liepiņš
(2), Viesturs Sprogis
(2), Jānis Sakne
(2), Kalvis Salmiņš
(3), Jānis Kaminskis
(4), Reinhard Falk
(5), David Stizza
(6)(1) Finnish Geospatial Research Institute FGI, Masala, Finland, (2) Department of Geodesy and Cartography, Latvian Geospatial Information Agency (LGIA), Riga, Latvia, (3) Institute of Astronomy, University of Latvia, Riga, Latvia, (4) Institute of Geodesy and Geoinformation, Riga Technical University, Riga, Latvia, (5) Division of Geodesy, Federal Agency for Cartography and Geodesy (BKG), Frankfurt am Main, Germany, (6) National Geospatial-Intelligence Agency (NGA), St. Louis, USA (at the time of the measurements)