1 College of Geography and Remote Sensing, Jiangsu Province Engineering Research Center of Water Resources and Environment Assessment Using Remote Sensing, and Key Laboratory of Hydrologic-Cycle and Hydrodynamic-System of Ministry of Water Resources, Hohai University, Nanjing 210098, China.
2 Department of Earth System Science, Institute of Global Change Studies, Tsinghua University, Beijing 100084, China; State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China; Tsinghua University (Department of Earth System Science)-Xi'an Institute of Surveying and Mapping Joint Research Center for Next-Generation Smart Mapping, Beijing 100084, China. Electronic address: luhui@tsinghua.edu.cn.
3 Department of Geography and Planning, University of Toronto, Toronto ON M5S 3G3, Canada.
4 Department of Geography, Department of Earth Science, University of Hong Kong, Hong Kong 999077, China. Electronic address: penggong@hku.hk.