Pingjing Nie, State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, China; Zhu Haitao, Ministry of Ecology and Environment Center for Satellite Application on Ecology and Environment, Beijing, China; Xu Honggen, Wuhan Center of China Geological Survey (Central South China Innovation Center for Geosciences), China; Yaohuan Huang, University of Chinese Academy of Sciences, China; Hua Wu, State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, China