Xiaoli Su¹, C.K. Shum², Kenneth C Jezek³, Junyi Guo², Ian Howat⁴, Kuo Chung-Yen⁵ and Zhicai Luo⁶, (1)Huazhong University of Science and Technology, Wuhan, China, (2)The Ohio State University, Division of Geodetic Science, School of Earth Sciences, Columbus, OH, United States, (3)Ohio State University Main Campus, Columbus, OH, United States, (4)The Ohio State University, Columbus, United States, (5)NCKU National Cheng Kung University, Geomatics, Tainan, Taiwan, (6)MOE Key Laboratory of Fundamental Physical Quantities Measurement, School of Physics, Huazhong University of Science and Technology, Wuhan, China