1. School of Computer Science, South China Normal University, Guangzhou, China
2. State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
3. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing Normal University, Nanjing, China
4. Technology Innovation Center of Geological Information of Ministry of Natural Resources, China Geological Survey, Beijing, China
5. Geological Information Center, Development and Research Center of China Geological Survey, Beijing, China