Affiliation: | (1) Department of Engineering Cybernetics, Norwegian University of Science and Technology, N-7491 Trondheim, Norway e-mail: xfhe@itk.ntnu.no, NO;(2) Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, Kowloon, Hong Kong e-mail: lsygchen@polyu.edu.hk, HK |