Yakun Han, Wuhan University /Southern Methodist University, School of Geodesy and Geomatics/ Huffington Department of Earth Sciences, Dallas, TX, United States, Jingui Zou, Wuhan University, School of Geodesy and Geomatics, Wuhan, China, Zhong Lu, Southern Methodist University, Dallas, TX, United States and Ya Kang, Chang'an University, Xi'an, China