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