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Leveraging Web-Based GIS for Managing Transportation Model Network Information

Leveraging Web-Based GIS for Managing Transportation Model Network Information. TRB Planning Applications Conference May 10 th , 2011 Reno, Nevada Steve Hossack Senior GIS Analyst Joaquin Ortega Associate Transportation Modeler. About SANDAG. Medium Sized MPO San Diego County

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Leveraging Web-Based GIS for Managing Transportation Model Network Information

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  1. Leveraging Web-Based GIS for Managing Transportation Model Network Information TRB Planning Applications Conference May 10th, 2011 Reno, Nevada Steve Hossack Senior GIS Analyst Joaquin Ortega Associate Transportation Modeler

  2. About SANDAG • Medium Sized MPO • San Diego County • 19 Jurisdictions • Over 3 million residents • International Border

  3. SANDAG Transportation Model Dimensions • Spatial • 4,682 traffic analysis zones (TAZ) • 2,000 traffic distribution zones (TDZ) • 2,500 transit access points • 12 external cordon zones • Network • 34,000 roadway network links • 21,000 roadway network nodes • 10 roadway facility types

  4. Transportation Model Network

  5. Attributes Number of Lanes Facility Type Posted Speed Intersection Controls Calibration Sources 2008 Base Year Aerial Photos EIRs and site plans Local general plans / circulation elements Regional Transportation Improvement Program (RTIP) Transportation Network Data Review & Model Calibration

  6. Challenges • Ongoing regional growth • Land use & demographic forecast frequency • Increased emphasis on model precision • Volume of links & nodes • Staff time

  7. Transportation Model Review Website • Allows local agencies to review model network using a web-browser • Simple Navigation • Controlled Access

  8. Transportation Model Review Website

  9. Transportation Model Editing

  10. Transportation Model Review Website

  11. Total Scope

  12. System Design

  13. Results • 16 of 19 jurisdictions participated • Over 2,000 comments submitted • Over 4,000 edits made • Project Timeline: 6 months

  14. Results • Lanes Added or Removed - 195 freeway ramps - 155 prime arterial links • 308 major arterial links • 504 collector links • 132 local street links • Intersection Edits - 218 traffic signals added • 381 all way stops added • 86 directional stops removed • Speed Limit Edits - 1,591 link changes of ± 5 mph • 580 link changes of ± 10 mph • 160 link changes of ± 15 mph

  15. Benefits • Streamlined calibration process • Low cost of web tool development • Increased rapport with jurisdictional staff • Increased model mapping accuracy

  16. Future Applications • Intersection attribute review • Median type review • Regional traffic count database • Circulation element updates • Parcel based land use review

  17. Thank You!Questions?

  18. System Architecture • Local Jurisdictions • Web browser • SANDAG GIS staff • ArcGIS Javascript • ArcGIS Server Enterprise • ASP.NET (Active Server Pages) • ArcGIS Geodatabase with SQL Server • SANDAG Modeling staff • ArcMap • ArcGIS Workstation

  19. 2008 Modeled Roadway Results • Speed Limit Edits - 1591 link changes of 5 mph • 580 link changes of 10 mph • 160 link changes of 15+ mph • Intersection Edits - 218 Traffic Signals Added • 381 All Way Stops Added • 86 Directional Stops Removed

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