1. Ph.D. Candidate, Dept. of Civil and Structural Engineering, Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong. E-mail: wschan.elsa@polyu.edu.hk
2. Chair Professor, Dept. of Civil and Structural Engineering, Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong. E-mail: ceylxu@polyu.edu.hk
3. Professor, Dept. of Land Surveying and Geo-Informatics, Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong. E-mail: lsxlding@polyu.edu.hk
4. Research Associate, Dept. of Land Surveying and Geo-Informatics, Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong. E-mail: xiongosu@sohu.com
5. Research Assistant, Dept. of Land Surveying and Geo-Informatics, Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong. E-mail: daiwujiao@163.com