1. Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, Hung Hom, Hong Kong
2. School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin, China
3. College of Information and Communication Engineering, Harbin Engineering University, Harbin, China
4. College of Shipbuilding Engineering, Harbin Engineering University, Harbin, China