1. College of Civil Engineering, Southwest Forestry University, Kunming, People’s Republic of China
2. National Geomatics Center of China, Beijing, People’s Republic of China
3. College of Civil and Architectural Engineering, North China University of Science and Technology, Tangshan, People’s Republic of China
4. College of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing, People’s Republic of China