1. Key Laboratory of Land Environment and Disaster Monitoring, MNR, China University of Mining and Technology (CUMT), Xuzhou, People’s Republic of China
2. School of Environment Science and Spatial Informatics, China University of Mining and Technology (CUMT), Xuzhou, People’s Republic of China
3. CommSensLab, Universitat Politècnica de Catalunya Barcelona, Spain
4. Instituto de Geociencias (IGEO), CSIC-UCM, 7 Madrid, Spain