1. a Professor of Surveying and Land Information, Department of Geomatics , The University of Melbourne , Victoria , 3010 , Australia E-mail:
2. b PhD Candidate, Department of Geomatics , The University of Melbourne , Victoria , 3010 , Australia E-mail:
3. c Surveyor-General of New South Wales Professorial Associate, Department of Geomatics , The University of Melbourne, PO Box 143 , Bathurst , NSW , 2795 , Australia E-mail: