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program utilizes the profile data which was punched on tape during
the previous operation. It also requires an input tape which defines
the desired elevation and path for the proposed highway. Given this
information, the computer calculates the area of each cross section
along the highway and determines the volume of earth which either
must be removed or added along that section. Operating as an X-Y
plotter, the AP-C system could be used to plot cross-sections and
profiles from highway and terrain data at the same time that the cut-
and-fill calculations are being performed.
CONCLUSION
The AP-C Analytical Stereoplotter consists of a viewing unit, a
coordinatograph, and a computer, which are electrically connected to
gether and programmed to operate as a precision photogrammetric
instrument. In addition to the usual functions of a stereoplotter, the
instrument can be used as an X-Y plotter or as a stereo comparator
with existing computer programs. The computer can also be
programmed to provide auxiliary functions as simple as computing
areas or as complex as analytical aerial triangulation and block
adjustment. The examples cited in the preceding sections are only
typical of many applications which may be found in general mapping
and surveying operations as experience with the AP-C system is
accumulated.