1. School of Information and Communication Engineering, Center for Information Geoscience, University of Electronic Science and Technology of China, Chengdu, China
2. School of Cyberspace Security, Beijing University of Posts and Telecommunications, Beijing, China
3. School of Geoscience and Technology, Southwest Petroleum University, Chengdu, China
4. School of Resource and Environment, Center for Information Geoscience, University of Electronic Science and Technology of China, Chengdu, China