1. Changjiang River Scientific Research Institute, Changjiang Water Resources Commission, Wuhan 430010, China
2. Research Center on Mountain Torrent and Geologic Disaster Prevention, Ministry of Water Resources, Wuhan 430010, China
3. Changjiang Survey, Planning, Design and Research Co., Ltd., Wuhan 430010, China
4. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China