1. Ph.D. Student, Geospatial Information Institute, Information Engineering Univ., Zhengzhou 450001, China; Lecturer, Dept. of Civil Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, China.
2. Lecturer, Geospatial Information Institute, Information Engineering Univ., Zhengzhou 450001, China; Postdoctoral Researcher, State Key Laboratory of Geo-information Engineering, Xi’an 710054, China (corresponding author).
3. Professor, Geospatial Information Institute, Information Engineering Univ., Zhengzhou 450001, China.