ABSTRACT
Very often the reconstructionist will not be called upon until elapsed time from the accident is measured not in days, weeks, or even months, but years. By that time, most if not all of the volatile evidence will have disappeared. However, photographs may well have been taken soon after the accident (or even before!). Why all the interest in photographs? Because there is objective information stored therein, waiting to be mined. Usually the breadth and depth of detailed information in good photographs extend far beyond any measurements or notes that could have been taken contemporaneously, and the information stays permanently recorded, as opposed to being ephemeral or changeable or transitory, like memories. The subject of Chapter 9 is how to extract photographic information that can be used to reestablish the pertinent evidence, so that it can be used in the reconstruction. Topics discussed include photographic analysis, the mathematical basis of photogrammetry, two-dimensional photogrammetry, camera reverse projection methods, two-photograph camera reverse projection, analytical reverse projection, and three-dimensional multiple-image photogrammetry.
