10 
After orientation procedures are completed, location data for 
all image points of interest may be punched on tape or typed for subse 
quent use. When all such points on a pair of photographs have been lo 
cated, the relative locations in ground coordinates may be punched, to 
gether with orientation data for each photograph. After a strip or block 
of photographs has been completed, the control point data may be used 
for strip or block adjustment computations. Finally, after the 
adjustment is determined, the data for all points may be adjusted. The 
orientation data for each photograph could also be adjusted and 
recorded for subsequent use by the AP-C system as a stereoplotter, 
thus avoiding the normal relative and absolute orientation procedures. 
A large class of civil engineering and surveying problems have 
in the past been performed by means of desk calculators and small 
desk-type computers. These problems also should be suitable for 
solution by means of the AP-C computer. Examples are cut-and-fill 
calculations, structural design problems, the reduction and checking 
of ground-survey data, either for use in mapping or for other purposes, 
and the conversion of coordinate measurements from one type of coordi 
nate system to another. 
In many fields of civil engineering, the AP-C system and the AP-C 
computer could be used in several different areas within a typical 
problem. Figure 5 shows a sequence of operations involved in a simpli 
fied highway design procedure. The first steps in the procedure, of 
course, are to obtain photographs of the proposed highway route and, by 
ground survey or other means, to locate an adequate number of control 
points along the route. The AP-C computer can be used to reduce the 
survey data, which may be in terms of distances and angles, to points in 
a common coordinate system. The next step in the sequence consists of 
aerial triangulation. This step can use AP-C computer programs to 
precisely orient each stereo model to the surveyed control points, as 
discussed previously. After aerial triangulation has been performed, 
profile data can be obtained from the individual stereo models for 
subsequent use in cut-and-fill calculations. As described previously, 
the profiling could require the operator simply to follow the proposed 
highway route, maintaining contact between the floating mark and the 
surface of the terrain. The computer would automatically select points 
at the proper distances along the highway to provide the required data 
for the cut-and-fill program which follows. The process continues then, 
to step four in Figure 5, which is the cut-and-fill program. This