Evolution of Network Orientation Procedures

This paper discusses the evolution of algorithms and procedures for network orientation that have accompanied the transition of close-range photogrammetry from a film-based to a digital image-based measurement process suited to partial or full automation. A brief mathematical background to orientation models derived via perspective projection and projective geometry is first presented, and the issue of generating initial values for image orientation parameters is discussed. The potential for employing linear models from projective geometry in the orientation process is also considered. Developments over the past few decades in multi-image network orientation processes are then reviewed, with the current state of the art being indicated by way of the discussion.