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. National Science Library, Chinese Academy of Sciences, Beijing, China
3. University of Chinese Academy of Sciences, Beijing, China
4. The Academy of Digital China, Fuzhou University, Fuzhou, China
5. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, China