1. Guangxi Key Laboratory of Spatial Information and Geomatics, the College of Earth Sciences, the College of Geomatics and Geoinformation, and the College of Information Science and Engineering, Guilin University of Technology, Guilin, China
2. College of Earth Sciences and the Guangxi Key Laboratory of Spatial Information and Geomatics, Guilin University of Technology, Guilin, China
3. Hebei Polytechnic Institute, Shijiazhuang, China
4. College of Geomatics and Geoinformation, Guilin University of Technology, Guilin, China
5. College of Earth Sciences, Guilin University of Technology, Guilin, China