1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, China
2. College of Earth Science, Chengdu University of Technology, Chengdu, China
3. Huffington Department of Earth Sciences, Southern Methodist University, Dallas, TX, USA
4. Technology Service Center of Surveying and Mapping, Sichuan Bureau of Surveying, Mapping and Geoinformation, Chengdu, China