1. Hubei Key Laboratory of Intelligent Geo-Information Processing, School of Computer Science, China University of Geosciences, Wuhan, China
2. Third Surveying and Mapping Institute of Hunan Province, Changsha, China
3. Jiangxi Province Key Laboratory of Water Information Cooperative Sensing and Intelligent Processing, School of Information Engineering, Nanchang Institute of Technology, Nanchang, China
4. College of Computer Sciences, Guangdong Polytechnic Normal University, Guangzhou, China
5. Guangzhou Institute of Building Science Group Company Ltd., Guangzhou, China