1. Department of Geography, Yunnan Normal University, Kunming, China
2. Key Laboratory of Resources and Environmental Remote Sensing for Universities in Yunnan, Yunnan Normal University, Kunming, Yunnan, China
3. Center for Geospatial Information Engineering and Technology of Yunnan Province, Yunnan Normal University, Kunming, Yunnan, China
4. Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, China