1. State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research; Chinese Academy of Sciences; Beijing China
2. State Key Laboratory of Earth Surface Processes and Resource Ecology, College of Resources Science and Technology; Beijing Normal University; Beijing China
3. Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, International Institute for Earth System Science; Nanjing University; Nanjing Jiangsu China
4. Department of Geography; University of Western Ontario; London Ontario Canada