Pavel Novak, University of West Bohemia, Plzen, 306, Czech Republic, Martin Pitonak, University of West Bohemia, NTIS – New Technologies for the Information Society, Pilsen, Czech Republic, Michal Sprlak, University of Newcastle, Callaghan, Australia and Robert Tenzer, The Hong Kong Polytechnic University, Department of Land Surveying and Geo-informatics, Hong Kong, Hong Kong