1. Doctoral Student, Geospatial Information College, Information Engineering Univ., Zhengzhou 450001, China.
2. Lecturer, Geospatial Information College, Information Engineering Univ., Zhengzhou 450001, China; Postdoctoral, Dept. of Geodesy, State Key Laboratory of Geo-information Engineering, Xi’an 710054, China; Postdoctoral, Dept. of Geodesy, Xi’an Research Institute of Surveying and Mapping, Xi’an 710054, China (corresponding author).
3. Professor, Geospatial Information College, Information Engineering Univ., Zhengzhou 450001, China.
4. Lecturer, Geospatial Information College, Information Engineering Univ., Zhengzhou 450001, China.