1. School of Resource and Environmental Sciences, Wuhan University, Wuhan, China
2. School of Geodesy and Geomatics, Wuhan University, Wuhan, China
3. Administrative Commission of Zhongguancun Changping Science Park, Beijing, China
4. School of Resource and Environmental Sciences, the Collaborative Innovation Center of Geospatial Technology, and the Hubei Luojia Laboratory, Wuhan University, Wuhan, China