Page 60 - Green - Maritime Archaeology: A Technical Handbook. 2nd ed

a
Figure 3.11 Photo resectioning using an overlay (a). This can be used to plot positions from photo triangulation or from any other angle-measuring system. Note that the angles that are used in (a) are obtained from figures (b) and (c). The angles are calculated from knowing the focal length of the camera lens and the frame format as shown in Figure 3.3. The calculated angles are drawn on a sheet of clear film and adjusted over the chart to obtain the position.
b
c