1. College of Earth Sciences and Engineering and the College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao, China
2. College of Earth Sciences and Engineering, Shandong University of Science and Technology, Qingdao, China
3. Transportation Institute, Inner Mongolia University, Hohhot, China
4. Nuclear Industry Huzhou Engineering Survey Institute Company, Ltd., Huzhou, China