^○Georgios S. Vergos, Ilias N. Tziavos (GravLab, Department of Geodesy and Surveying, Aristotle University of Thessaloniki, Thessaloniki, GR-54124, Greece)

^○Jaakko Makinen (Finnish Geospatial Research Institute (FGI), National Land Survey, Masala, Finland)

^○Thomas Grombein, Lucas Porz, Kurt Seitz, Bernhard Heck (Karlsruhe Institute of Technology, Geodetic Institute, Karlsruhe, Germany)

Mirko Reguzzoni¹, Georgios S. Vergos², Giovanna Sona¹, ^○Riccardo Barzaghi¹, Ilias N. Tziavos², Alberta Albertella¹, Daniela Carrion¹, Carlo I. De Gaetani¹, Lorenzo Rossi¹ (1.Department of Civil and Environmental Engineering, Politecnico di Milano, Milan, Italy, 2.GravLab, Department of Geodesy and Surveying, Aristotle University of Thessaloniki, Thessaloniki, Greece)

^○Vicki Childers, Monica Youngman, Theresa Damiani (NOAA/National Geodetic Survey, Silver Spring, MD, USA)

Ourania Altiparmaki¹, ^○Georgios S. Vergos¹, Ole Andersen² (1.GravLab, Department of Geodesy and Surveying, Aristotle University of Thessaloniki, Greece, 2.DTU SPACE, National Space Institute, Technical University of Denmark, Denmark)