1. Faculty of Geography, Yunnan Normal University, Kunming 650500, China
2. Key Laboratory of Resources and Environmental Remote Sensing for Universities in Yunnan, Kunming 650500, China
3. Center for Geospatial Information Engineering and Technology of Yunnan Province, Kunming 650500, China
4. Southwest United Graduate School, Kunming 650092, China
5. School of Geographical Science, Fujian Normal University, Fuzhou 350007, China