Yu Zhang¹, C.K. Shum^1,2, Wei Chen^1,2, Junyi Guo¹, Chaoyang Zhang¹, Ales Bezdek³, Chung-Yen Kuo⁴, Christopher Harig⁵, Xiaoli Su⁶ and Wei Feng², (1)The Ohio State University, Division of Geodetic Science, School of Earth Sciences, Columbus, OH, United States, (2)Institute of Geodesy & Geophysics, Chinese Academy of Sciences, Wuhan, China, (3)Academy of Sciences of the Czech Republic, Astronomical Institute, Prague, Czech Republic, (4)National Cheng Kung University, Tainan, Taiwan, (5)University of Arizona, Department of Geosciences, Tucson, AZ, United States, (6)Huazhong University of Science and Technology, Wuhan, China