1. School of Earth Sciences and Spatial Information Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
2. Institute of International Rivers and Eco-Security, Yunnan University, Kunming 650091, China
3. School of Resource Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
4. School of Spatial Information and Mapping Engineering, Anhui University of Science and Technology, Huainan 232001, China