1. College of Geological Engineering and Geomatics, Chang’an University, Xi’an, China
2. College of Geological Engineering and Geomatics, Key Laboratory of Loess, Xi’an, China
3. Big Data Center for Geosciences and Satellites, Chang’an University, Xi’an, China
4. Key Laboratory of Western China’s Mineral Resources and Geological Engineering, Ministry of Education, Xi’an, China
5. School of Geodesy and Geomatics, Wuhan University, Wuhan, China