1. Key Laboratory for Land Environment and Disaster Monitoring, Ministry of Natural Resources, China University of Mining and Technology, Xuzhou, China
2. School of Mines, China University of Mining and Technology, Xuzhou, China
3. School of Geosciences and Info-Physics, Central South University, Changsha, China
4. Key Laboratory of Geographic Information Science (Ministry of Education), East China Normal University, Shanghai, China
5. School of Geography and Ocean Science, Nanjing University, Nanjing, China