1. School of Land Science and Technology, China University of Geosciences, 29 Xueyuan Lu, Beijing 100083, China
2. Beijing Institute of Surveying and Mapping, 15 Yangfangdian Lu, Beijing 100080, China
3. National Institute of Natural Hazards, Ministry of Emergency Management of China, Beijing 100085, China
4. Power China Zhongnan Engineering Corporation Limited, 16 Xiangzhang East Road, Changsha 410014, China