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Enhancing Highway Model Networks with GIS - A New Approach

Explore the integration of true shape GIS networks into highway model forecasting, improving accuracy, efficiency, and integration with Cube Voyager software. Learn how to navigate challenges and solutions in this innovative approach.

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Enhancing Highway Model Networks with GIS - A New Approach

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  1. Using GIS Networks to Represent Model Networks May 19, 2009 Hoyt Davis & Chunyu Lu Gannett Fleming, Inc.

  2. Outline • Background Introduction • Generating True Shape Networks in Travel Forecast Model • Incorporate Into Cube Environment • New Technology • Questions?

  3. Background Introduction • Former Florida highway model networks were generally “stick-figured” networks that show traffic flows from one node point to another using straight lines. • The “stick-figured” networks usually: • Do not have to represent the highway network in a visually pleasing way; • Are commonly modified to allow some roadway curvature by breaking their network links into smaller pieces; • Do not incorporate full functionality from ArcGIS Engine and Geodatabase; • Make the highway network less efficient causing longer model processing times. • The latest versions of Cube Voyager allow users to utilize true shape networks which use GIS detail accuracy in its integrated network environment.

  4. “Stick-figured” Network

  5. Background Introduction • FDOT District 7 and District 5 have requested for Gannett Fleming to develop GIS-based highway networks for initial use in their Regional Planning Models. • The new GIS-based network is expected to: • Improve the accuracy of the model in terms of truer GIS distances of highway facilities; • Decrease the number of highway links in the model networks and therefore decrease the model processing times; • Incorporate full functionality of the ArcGIS Engine and Geodatabase technology; • Provide for better integration with future versions of the Cube Voyager software.

  6. True Shape Network

  7. Outline • Background Introduction • Generating True Shape Networks in Travel Forecast Model • Incorporate Into Cube Environment • New Technology • Q&A

  8. How Did We Get Started… • Available data resources: • State TeleAtlas/GDT roadway data • Aerial photos • Existing model networks • There are two options to get started: • Start with available non-transportation base true shape GIS networks to clean network attributes and merge links; or • Start with existing model networks and realign network links based on true shape curvatures from true shape GIS networks. • It was more efficient to start from the model networks and manually realign the network to true shape curvatures.

  9. Challenges • #1: Consolidate the network from small link pieces; • #2: Manually match every vertex to the true shape curve; • #3: Incorporate the true shape network into the Cube environment and the model flow seamlessly. Solutions: • Link consolidation based on area type, facility type, and number of lane combination; • Link conflation tool developed using Visual Basic for Applications in the ArcGIS Environment; • “Build Network from Shape File” Tool and Cube script.

  10. Other Challenges • Coordinate with the Department and the MPOs to determine all improvements to the highway system between existing network and the new base year network. • More network attributes were required to be added: • Posted Speed • Count Sources and Count Station ID • Local /MPO/ County Screenlines • Highway network support file development included: • Toll link file • Time penalty and turn prohibitor file • Transit station file • Use Cube scripting to develop a process to convert the GIS network shape file to a model network.

  11. Link Consolidation

  12. Geometry Conflation Tool Target: GDT Layer Model Network

  13. Select Nodes for Shortest Path

  14. Run Shortest Path

  15. Geometry Conflation Link Match Node Match

  16. Link Direction vs. Two-way Attribute

  17. New Roadway Attributes • Road Name and Alternative Road Name • Posted Speed • Traffic Count Sources and Station ID • Local/County/MPO Screenlines • Roadway Label and Number • Federal Functional Classification code

  18. Road Names and Number of Lanes

  19. Federal Functional Classification

  20. Network Link Data Dictionary

  21. Renumber Highway Nodes

  22. Highway Links and Nodes by County • The true shape network means new features: • Specify external and dummy centroids • Node renumbering by County • Node number sorted by X and Y coordinates • Highway links and centroid connectors summary by County

  23. Outline • Background Introduction • Generating True Shape Networks in Travel Forecast Model • Incorporate Into Cube Environment • New Technology • Q&A

  24. Build Cube Network from True Shape

  25. Script in Cube Voyager

  26. Geodatabase Manager in Cube

  27. True Shape Highway Network

  28. Edit Highway Links in Cube • Add Highway Links • Copy links attributes • Update node number • Move Links • Node snapping • Update node number • Link direction • Delete Links • Link Split

  29. Transit Network in Cube

  30. Edit Transit Network

  31. Outline • Background Introduction • Generating True Shape Networks in Travel Forecast Model • Incorporate Into Cube Environment • New Technology • Q&A

  32. Outline • Background Introduction • Generating True Shape Networks in Travel Forecast Model • Incorporate Into Cube Environment • New Technology • Q&A

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