*Michael R Pearlman¹, Carey E Noll², Dirk Behrend³, Allison Craddock⁴, Erricos Pavlis⁵, Jérôme Saunier⁶, Elizabeth Bradshaw⁷, Riccardo Barzaghi⁸, Daniela Thaller⁹, Benjamin Maennel¹⁰, Ryan Hippenstiel Hippenstiel¹¹, Roland Pail¹², Nicholas Brown¹³ (1.Center for Astrophysics, Cambridge MA, United States, 2.NASA Goddard Space Flight Center, Code 61A, Greenbelt MD, United States, 3.NVI, Inc./NASA Goddard Space Flight Center, Greenbelt MD, United States, 4.Jet Propulsion Laboratory/California Institute of Technology, Pasadena, CA, United States, 5.University of Maryland, Baltimore MD, United States, 6.Institut Géographique National, St. Mande, France , 7.National Oceanography Centre, Liverpool, United Kingdom, 8.Politecnico di Milano, Milan, Italy, 9.Bundesamt fuer Kartographie und Geodaesie, Frankfurt, Germany, 10.GeoForschungsZentrum, Potsdam, Germany, 11.National Geodetic Survey, Silver Spring, MD, United States, 12.Technische Universitaet Muenchen, Munich, Germany, 13.Geoscience Australia, Canberra, Australia)