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Utilization of Computer Plotting in Traffic Assignment Analysis
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1964-11-01
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Abstract:Examination of the numerous pages of data produced by traffic assignment computer programs is a tedious and time-consuming task. As a result, the work incurs a high probability of error. Therefore, some type of summary and visual representation for traffic network analysis is highly justified. The best form of output would be a computer-drawn map of the network being studied. With such a map, on which volumes of traffic or changes to the existing network could be plotted, many preliminary analyses could be made rapidly and with a high degree of accuracy. The development of computer-drawn maps is not a new idea, as such maps have been produced using printed characters to give a resemblance of the network. These, however, are difficult to examine. A new development has been introduced to the computer devices industry. This device, termed a digital incremental plotter, is now being recognized as a powerful tool. An incremental plotter operates in the following manner: an impulse, or signal is sent to the plotter directing the plotter pen to move in a particular direction and to lift or to lower itself. Straight lines may be drawn, then, for representation of data in graphical form. Since the digital incremental plotter appeared to have significant potential as an aid to the analysis of data from traffic assignment programs, a research study was initiated by the Texas Transportation Institute to develop plotting programs. Work on the development of the plotting programs was initiated in September 1963 and completed in October 1964. This report will discuss the plotting capabilities and requirements of the plot programs in order to acquaint those responsible for the analysis of traffic assignment data with their use and to permit an evaluation of the plot programs as an additional tool for data analysis.
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