1. Ph.D. Candidate, College of Surveying and GeoInformatics, Tongji Univ., Shanghai, 200092, People’s Republic of China.
2. Professor, College of Surveying and GeoInformatics, Tongji Univ., Shanghai, 200092, People’s Republic of China (corresponding author).
3. Professor, College of Surveying and GeoInformatics, Tongji Univ., Shanghai, 200092, People’s Republic of China.