1. Geospatial Sciences Center of Excellence, South Dakota State University, Brookings, SD, USA
2. Institute of Space and Earth Information Science, The Chinese University of Hong Kong, Shatin, Hong Kong
3. Department of Geography, National University of Singapore, Singapore, Singapore
4. Ministry of Education Key Laboratory for Earth System Modelling, Centre for Earth System Science, Institute for Global Change Studies, Tsinghua University, Beijing, China