1. University of Electronic Science and Technology of China, School of Information and Communication Engineering, Chengdu 611731, China..
2. Chongqing University of Technology, School of Computer Science and Engineering, Chongqing 400054, China..
3. University of Electronic Science and Technology of China, School of Resources and Environment, Chengdu 611731, China..
4. University of Electronic Science and Technology of China, School of Resources and Environment, Chengdu 611731, China and University of Electronic Science and Technology of China, Center for Information Geoscience, Chengdu 611731, China..
5. University of Electronic Science and Technology of China, School of Information and Communication Engineering, Chengdu 611731, China, University of Electronic Science and Technology of China, School of Resources and Environment, Chengdu 611731, China, and University of Electronic Science and Technology of China, Center for Information Geoscience, Chengdu 611731, China..