1. Department of Land Surveying and Geo-Informatics; The Hong Kong Polytechnic University; Kowloon; Hong Kong
2. Geodetic Survey Section; Lands Department, ; Hong Kong SAR; Hong Kong
3. Department of Land Management; Feng-Chia University; Taichung; Taiwan
4. Department of Civil and Structural Engineering; The Hong Kong Polytechnic University; Kowloon; Hong Kong