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Leveraging Web-Based GIS for Managing Transportation Model
Network Information
Leveraging Web-Based GIS for Managing Transportation Model
Network InformationTRB Planning Applications ConferenceTRB Planning Applications Conference
May 10May 10thth, 2011, 2011Reno, NevadaReno, Nevada
Steve HossackSteve HossackSenior GIS AnalystSenior GIS Analyst
Joaquin OrtegaJoaquin OrtegaAssociate Transportation ModelerAssociate Transportation Modeler
Medium Sized MPOMedium Sized MPO– San Diego CountySan Diego County– 19 Jurisdictions19 Jurisdictions– Over 3 million residentsOver 3 million residents– International BorderInternational Border
About SANDAGAbout SANDAG
SpatialSpatial– 4,682 traffic analysis zones (TAZ)4,682 traffic analysis zones (TAZ)– 2,000 traffic distribution zones (TDZ)2,000 traffic distribution zones (TDZ)– 2,500 transit access points2,500 transit access points– 12 external cordon zones12 external cordon zones
NetworkNetwork– 34,000 roadway network links34,000 roadway network links– 21,000 roadway network nodes21,000 roadway network nodes– 10 roadway facility types10 roadway facility types
SANDAG Transportation Model Dimensions
SANDAG Transportation Model Dimensions
Transportation Model NetworkTransportation Model Network
Transportation Network Data Review & Model Calibration
Transportation Network Data Review & Model Calibration
AttributesAttributes– Number of LanesNumber of Lanes– Facility TypeFacility Type– Posted SpeedPosted Speed– Intersection ControlsIntersection Controls
Calibration SourcesCalibration Sources– 2008 Base Year2008 Base Year– Aerial PhotosAerial Photos– EIRs and site plansEIRs and site plans– Local general plans / Local general plans /
circulation elementscirculation elements– Regional Transportation Regional Transportation
Improvement Program Improvement Program (RTIP)(RTIP)
ChallengesChallenges
Ongoing regional growthOngoing regional growth Land use & demographic forecast Land use & demographic forecast
frequencyfrequency Increased emphasis on model precisionIncreased emphasis on model precision Volume of links & nodesVolume of links & nodes Staff timeStaff time
Transportation Model Review WebsiteTransportation Model Review Website
Allows local Allows local agencies to agencies to review model review model network using a network using a web-browserweb-browser
Simple Simple NavigationNavigation
Controlled Controlled AccessAccess
Transportation Model Review WebsiteTransportation Model Review Website
Transportation Model EditingTransportation Model Editing
Transportation Model Review WebsiteTransportation Model Review Website
Total ScopeTotal Scope
System DesignSystem Design
ResultsResults
16 of 19 jurisdictions participated16 of 19 jurisdictions participated
Over 2,000 comments submittedOver 2,000 comments submitted
Over 4,000 edits madeOver 4,000 edits made
Project Timeline: 6 monthsProject Timeline: 6 months
ResultsResults
Speed Limit Edits Speed Limit Edits - 1,591 link changes of ± 5 mph- 1,591 link changes of ± 5 mph-580 link changes of ± 10 mph580 link changes of ± 10 mph-160 link changes of ± 15 mph160 link changes of ± 15 mph
Intersection EditsIntersection Edits- 218 traffic signals added- 218 traffic signals added-381 all way stops added381 all way stops added-86 directional stops removed86 directional stops removed
Lanes Added or RemovedLanes Added or Removed- 195 freeway ramps- 195 freeway ramps- 155 prime arterial links- 155 prime arterial links-308 major arterial links308 major arterial links-504 collector links504 collector links-132 local street links132 local street links
BenefitsBenefits
Streamlined calibration processStreamlined calibration process
Low cost of web tool developmentLow cost of web tool development
Increased rapport with jurisdictional Increased rapport with jurisdictional staffstaff
Increased model mapping accuracyIncreased model mapping accuracy
Future ApplicationsFuture Applications Intersection attribute reviewIntersection attribute review
Median type reviewMedian type review
Regional traffic count databaseRegional traffic count database
Circulation element updatesCirculation element updates
Parcel based land use reviewParcel based land use review
Thank You!
Questions?
Thank You!
Questions?
System ArchitectureSystem Architecture Local JurisdictionsLocal Jurisdictions
- Web browserWeb browser
SANDAG GIS staffSANDAG GIS staff- ArcGIS JavascriptArcGIS Javascript- ArcGIS Server EnterpriseArcGIS Server Enterprise- ASP.NET (Active Server Pages)ASP.NET (Active Server Pages)- ArcGIS Geodatabase with SQL ServerArcGIS Geodatabase with SQL Server
SANDAG Modeling staffSANDAG Modeling staff- ArcMapArcMap- ArcGIS WorkstationArcGIS Workstation
2008 Modeled Roadway Results2008 Modeled Roadway Results
Lane Miles % of VMT Lane Miles % of VMT
Freeway 3,126 59.5% 3,121 56.7%
Prime Arterial 1,065 8.1% 1,059 8.8%
Major Arterial 3,080 17.8% 3,036 18.7%
Collector 4,617 13.1% 4,557 14.1%
Local Street 738 1.5% 834 1.7%
TOTAL 12,626 12,607
Before After
Speed Limit EditsSpeed Limit Edits- 1591 link changes of 5 mph- 1591 link changes of 5 mph-580 link changes of 10 mph580 link changes of 10 mph-160 link changes of 15+ mph160 link changes of 15+ mph
Intersection EditsIntersection Edits- 218 Traffic Signals Added- 218 Traffic Signals Added-381 All Way Stops Added381 All Way Stops Added-86 Directional Stops Removed86 Directional Stops Removed