1. School of Geographical Sciences/Hebei Key Laboratory of Environmental Change and Ecological Construction/Hebei Technology Innovation Center for Remote Sensing Identification of Environmental Change, Hebei Normal University, Shijiazhuang, Hebei 050024, China
2. Institute of Geographical Sciences, Hebei Academy Sciences/Hebei Engineering Research Center for Geographic Information Application, Shijiazhuang, Hebei 050011, China
3. State Key Laboratory of Earth Surface Processes and Resource Ecology, MOE Engineering Center of Desertification and Blown-sand Control, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China