1. College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao, China
2. Qingdao Key Laboratory of Beidou Navigation and Intelligent Spatial Information Technology Application, Shandong University of Science and Technology, Qingdao, China
3. College of Surveying and Geo-Informatics, Tongji University, Shanghai, China
4. Operations Management Department, Xilingol Mengshan Gold Alhada Mining Co. Ltd, Inner Mongolia, China