1. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, China
2. Key Laboratory of Virtual Geographic Environment of Ministry of Education, Nanjing Normal University, Nanjing, China
3. School of Geography, Nanjing Normal University, Nanjing, China
4. State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
5. Department of Geography, University of Wisconsin‐Madison, Madison, WI USA
6. Earth Science Department, Santa Monica College, Santa Monica, CA, USA