1. School of Earth Sciences, Yunnan Univ, Kunming, China
2. School of Continuing Education, West Yunnan University of Applied Sciences, Dali, China
3. Institute of International Rivers and Eco-Security, Yunnan Univ, Kunming, China
4. School of Land and Resources Engineering, Kunming University of Science and Technology, Kunming, China
5. Surveying and Mapping Management Office, Kunming Surveying and Mapping Management Center, Kunming, China