MICHIGAN STATEWIDE TRANSPORTATION MODELING SYSTEMS. VOLUME III-B. AUTOMATIC NETWORK GENERATOR USING INTERACTIVE GRAPHICS. STATEWIDE TRANSPORTATION PLANNING PROCEDURES

Creating a modeling network typically involves coding each node and each link by hand, keypunching the resulting cards, and submitting a batch run to build the net. Then another batch plot run is needed to verify that the coding was done correctly, followed by another day's wait until the plot is delivered. If errors are discovered, corrections are coded and the cycle begins again. This tremendous time lag partially explains the resistance of many agencies in developing a modeling system; moreover, using an off-line digitizer in place of hand coding only partially solves the problem. It relieves some of the tedium involved, but does little to shorten the elapsed time. Statewide has developed a process in which a network is digitized on-line on a Tektronix graphic tablet connected to a Tektronix full-graphic CRT computer terminal. The advantages of this system are obvious: 1) no boring coding is necessary, 2) a picture of each link appears on the screen as it is entered into the data base enabling instant error correction, and 3) since no keypunching, plotting, or other off-line processes are involved, turnaround is reduced by as much as 80%. This type of system becomes very important in going from statewide or regional planning to project-level planning. Often, it is necessary to create several very detailed alternative networks. In a situation where quick answers are needed, these tablet routines can make the difference between getting answers and having to say, "We can't do that." /Author/

  • Corporate Authors:

    Michigan Department of Transportation

    State Transportation Building, 425 West Ottawa Street, P.O. Box 30050
    Lansing, MI  USA  48909
  • Authors:
    • Newell, J A
  • Publication Date: 1977-8

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00307620
  • Record Type: Publication
  • Report/Paper Numbers: Vol III-B Monog Ser
  • Files: TRIS, STATEDOT
  • Created Date: Jun 9 1980 12:00AM