1. NASG Key Laboratory for Land Environment and Disaster Monitoring, China University of Mining and Technology (CUMT), Xuzhou, Jiangsu, China
2. School of Environment Science and Spatial Informatics, China University of Mining and Technology (CUMT), Xuzhou, China
3. School of Surveying and Geo-Informatics, Shandong Jianzhu University(SJU), Jinan, China
4. School of Computer Science and Technology, China University of Mining and Technology (CUMT), Xuzhou, China