The Virginia department of highways was the first state highway department to use analytical triangulation as a method of control extension as a totally in-house operation. This paper deals mainly with the mechanical operation and the gathering of data rather than the processing of these data in an electronic computer. The process described uses a wild pug-3 to transfer and mark points and a Mann monocomparator to read photo coordinates. The techniques employed in using the instruments and the results obtained are discussed. It concluded that analytical aerial triangulation is a satisfactory method of control extension for highway photogrammetric surveys and that the new skills required can be mastered by the average highway photogrammetrist.
Abstract