Institution: | 1. Key Laboratory of Virtual Geographic Environment, Nanjing Normal University, Nanjing 210023, P.R.China;2. State Key Laboratory Cultivation Base of Geographical Environment Evolution (Jiangsu Province), Nanjing 210023, P.R.China;3. Jiangsu Center for Collaborative Innovation in Geographic Information Resource Development and Application, Nanjing 210023, P.R.China;4. State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, P.R.China;5. Department of Geography, University of Wisconsin-Madison, Madison, WI 53706, USA |