Geographical data and its acquisition / Yuk-Cheung Lee -- Coordinate systems and datum / Esmond Mok, Jason Chao -- Transformation of coordinates between Cartesian systems / Xiao-Li Ding -- Map projections / Yuk-Cheung Lee -- Geographical data from analogue maps / Yuk- Cheung Lee and Lilian Pun -- Ground-based positioning techniques / Steve Y. W. Lam and Yong Qi Chen -- Satellite-based positioning / Esmond Mok, Gunther Retscher -- Techniques for underwater data acquisition / Gunther Retscher -- Image acquisition / Bruce King and Kent Lam -- Orthoimage generation and measurement from single images / Zhilin Li -- Geometric data from images / Bruce King -- Thematic information from digital images / Qiming Zhou -- Current trends in geographical data acquisition: an epilogue / Zhilin Li and Yon-Qi Chen.