1. State Key Laboratory of Information Engineering in Survey, Mapping, and Remote Sensing, Wuhan University, Wuhan, China; Department of Land Surveying and Geoinformatics, Hong Kong Polytechnic University, Kowloon, Hong Kong, China.
2. Department of Land Surveying and Geoinformatics, Hong Kong Polytechnic University, Kowloon, Hong Kong, China.
3. Department of Civil and Structural Engineering, Hong Kong Polytechnic University, Kowloon, Hong Kong, China.