Transportation Special Interest Group February 19 th, 2008 Chester County Planning Commission Chester County PA Presenters: Randy Waltermyer Cathy Sbarbaro
Planning is a heavy user of third party transportation data from different agencies: • • • Penn. DOT SEPTA TANA DVRPC Counties Municipalities (signals)
Pre. LRS – Completely separate centerline files and no efficient way to exchange data between them. – No cohesive data management standards between agencies – No efficient way to do analysis on data.
Why is data management important?
Why is data management important?
Why is data management important? Respond to Questions
Why is data management important? Respond to Questions • Programming
Why is data management important? Respond to Questions • Programming • Legislative
Why is data management important? Respond to Questions • Programming • Legislative • Public
Why is data management important? Respond to Questions • Programming • Legislative • Public • DOTs
Why is data management important? Respond to Questions • Programming • Legislative • Public • DOTs • Funders
Why is data management important? Respond to Questions • Programming • Legislative • Public • DOTs • Funders • Counties
Why is data management important? Respond to Questions • Programming • Legislative • Public • DOTs • Funders • Counties • Municipalities
Why is data management important? Respond to Questions • Programming • Legislative • Public • DOTs • Funders • Counties • Municipalities • MPOs
Multiple agencies don’t have identical geometry
Multiple agencies don’t have identical geometry
Multiple agencies currently don’t have identical geometry
Multiple agencies currently don’t have identical geometry
Penn. DOT segment
Chester County centerline segment
TANA segment
Goals: • Integrate multiple databases from multiple agencies and/or data stewards • Update on regular cycles • Prevent duplication of data maintenance and reduce error • Multiple agencies can exchange data • Multiple agencies can do analysis with third party data on their own geometry
Why use Linear Referencing Standardization for collecting and reporting data – Set standards for multiple jurisdictions (MPO, state, county and municipality) Simplify data transfer and storage – Preserves original centerline segmentation – Efficiently transfer attributes to new road layer – Reduce redundancy and error No geographic editing If segment ID changes, the data structure stays intact. LRS serve as the conduit of data exchange between agencies.
Data sets maintained by Planning • Highway Functional Class
Data sets maintained by Planning • Highway Functional Class • Traffic Volumes – Penn. DOT
Data sets maintained by Planning • Highway Functional Class • Traffic Volumes – Penn. DOT – Chester County
Data sets maintained by Planning • Highway Functional Class • Traffic Volumes – Penn. DOT – Chester County • Bus Routes
Chester County Centerline
Septa Route 104
Ramps from GIS-T LRS
GIS-T Local LRS
Bus Route 104 LRSd
Event Layer tool
Route Event Generation Tool
Future Capabilities: Service area analysis Maintain a data that is compatible with state, MPO, other counties and municipalities. Value added from individual agencies can be share back to the County and vice verse. Quality control on data
Transportation Improvement Inventory • Inventory of transportation needs/projects • 503 projects = $5. 7 Billion • “Under-utilized” due to report format
2007 Inventory
CCPC ID # NF 79 SR # 113 MPMS # n/a Primary Municipality: East Pikeland Project Name: Pa 113 @ Coldstream Rd Improvement Type: Channelization Length (Miles): 0. 1 Design Cost: $80, 000 Land Cost: $20, 000 Construction Cost: $800, 000 Total Estimated Cost: $900, 000 State Senate District: 19 State House District: 167 AADT: 17, 000 Total Score: 30
Proposed Development Activity 1999 to Present
Building the TII in GIS • Used Penn. DOT’s MPMS and BMS layers as starting points • Linear-referenced other projects using customized referencing tool • Created series of point and line events
Challenges and Lessons • Linear referencing “new alignments” • Editing practices between: – events (maintenance) – feature classes (production/distribution)
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