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. University of Chinese Academy of Sciences, Beijing, China
3. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, China
4. School of Geography and Ocean Science, Nanjing University, Nanjing, China
5. College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, China