1. School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo 454003, China
2. Collaborative Innovation Center of Geo-Information Technology for Smart C Entral Plains, Zhengzhou 450045, China
3. Key Laboratory of Spatiotemporal Perception and Intelligent Processing, Ministry of Natural Resources, Zhengzhou 450045, China
4. Institute of Surveying and Mapping, Information Engineering University, Zhengzhou 450001, China