1. Key Laboratory of Earth Exploration and Information Technology, Ministry of Education, Chengdu University of Technology, Chengdu, China
2. Key Laboratory of Earth Exploration and Information Technology, Ministry of Education, State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, China
3. School of Automation and Information Engineering, Sichuan University of Science and Engineering, Zigong, China