1. NTIS—New Technologies for the Information Society, Faculty of Applied Sciences, University of West Bohemia, Technická 8, 306 14Plzeň, Czech Republic
2. Department of Engineering Science, University West, 461 32 Trollhättan, Sweden
3. School of Engineering, Faculty of Engineering and Built Environment, University of Newcastle, Callaghan, NSW 2308, Australia
4. Department of Land Surveying and Geo-informatics, The Hong Kong Polytechnic University, 181Chatham Road South, Hung Hom, 999077 Kowloon, Hong Kong