1. College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao 266590, China
2. Shandong Province Research Center of Engineering and Technology for “3S”—GPS, RS and GIS, Shandong University of Science and Technology, Qingdao 266590, China
3. Star-Rising Technologies Co., Ltd., Qingdao 266590, China
4. Chinese Academy of Surveying and Mapping, Beijing 100036, China