1. School of Surveying and Geo-Informatics, Shandong Jianzhu University, Jinan, China
2. State Key Laboratory of Geodesy and Earth’s Dynamics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, China
3. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China
4. Department of Surveying and Geoinformatics, Nanjing University of Posts and Telecommunications, Nanjing, China