1. PhD Candidate, School of Surveying and Spatial Information Systems, Univ. of New South Wales, Sydney, NSW 2052, Australia.
2. Lecturer, School of Surveying and Spatial Information Systems, Univ. of New South Wales, Sydney, NSW 2052, Australia.
3. Professor, School of Surveying and Spatial Information Systems, Univ. of New South Wales, Sydney, NSW 2052, Australia.
4. Assistant Professor, Dept. of Civil and Environmental Engineering and Geodetic Science, The Ohio State Univ., 470 Hitchcock Hall, 2070 Neil Ave., Columbus, OH.