Typical photogrammetric mapping systems could well be called 2-1/2-dimensional since they collect data for presentation on two dimensional maps by treating elevation as an attribute. However, in close-range photogrammetric applications, there is often the need to collect and utilize truly three dimensional data. Because of this, a new system, FoTo-G has been developed for three dimensional photogrammetric mapping applications. It is a production oriented software system designed to work with the highly unconventional photogrammetric image configurations which- result when photographing 3D objects. This paper describes several innovative and novel concepts which have been utilized to overcome traditional limitations and avoid common pitfalls.
Dave E. Knopp,
"Interactive photogrammetric system for mapping 3D objects", Proc. SPIE 1395, Close-Range Photogrammetry Meets Machine Vision, 13952L (1 August 1990); doi: 10.1117/12.2294336; https://doi.org/10.1117/12.2294336