BENEFITS OF A MULTI-YEAR TRAVEL MODEL NETWORK CODING ENVIRONMENT

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BENEFITS OF A MULTI-YEAR TRAVEL MODEL NETWORK
CODING ENVIRONMENT

• TRB Planning Applications Conference
• Monday, May 7, 2007

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BENEFITS OF A MULTI-YEAR TRAVEL MODEL NETWORK
CODING ENVIRONMENT

• Prepared by
• Francisco Torres and Ken Cervenka

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Travel Roadway Networks at NCTCOG

• 5,000 square-mile of the metropolitan planning
  area
• 32,000 roadway links
• 14,000 miles
• Roadway networks associated to the several
  planning years.
• Maintained as separate GIS layers in TransCAD

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North Central Texas Region
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Dallas-Fort Worth Metropolitan Planning Area
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Multi-Year Network Tasks
Setting Guidelines
Improving existing data
Merging of current networks
Designing a user interface
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Source of Existing Networks
Base Network 1999
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Current Network Updates Process
Base Network 1999
2005
2007
2012
2025
2030
2015
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Drawbacks of Maintaining Several Versions

• Modifications of alignment and attributes are
  done independently
• Updates should be propagated to future planning
  years
• Amount of maintenance work is proportional to the
  number of versions
• Failure to propagate updates results in
  inconsistency of versions

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Multi-Year Concept
2030
2025
2015
2012
2009
2007
2005
Base Network 1999
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Benefits of Multi-Year Network

• Modifications of alignment and attributes are
  done at once for several years.
• Easier to maintain. Updates are propagated
  automatically to future planning years
• Amount of maintenance work is reduced
  considerably
• The network of a specific year can be defined as
  a subset of the comprehensive line layer
• Improved consistency among years

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Improving Existing Layers

1. Re-Alignment. Reshape based on All-Streets
   network and aerials photos
2. Rectification. Check topology, redesign ramps,
   identify medians and add access roads to transit.
3. Verification of Current Attributes . Number of
   lanes, signalized intersections, horizontal
   signage.

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Re- alignment of network
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Compatibility with detailed All-Streets network
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Intersection of 4 Roads with Medians
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Rectification of Ramps
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Access to Train/Rail stations
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Multi-Year Network Basic Features

• Only one file is used
• Need of additional editing tools to identify
  overlapping links
• Start and ending years must be defined

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Example of Future Interchange
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Example of Railroad Crossing
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Treatment of future alignments
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Storing Attribute Data
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Merging Year Networks
2015
1999
2025
2005
2007
2030
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Merging Existing Networks
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Comparing 2005 2030
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Comparing 2005 2030
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Spatial Similarity of Networks
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Tasks to Merge Year Networks

• Identify common alignments
• Consider future alignments
• Assign a life cycle to every alignment (start and
  end year)
• Fix inconsistencies of attributes for similar
  alignments
• Identify life cycle of attributes

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Master Network Interface
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Improvements to Existing Network Editing Tools

• Multi-User environment for coders
• Automatic error checking of attribute data
• Keeping a log of changes made to master multiyear
  network (who, when what)

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Merging Networks from Coders
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Multi-User Environment
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Future Steps

• Multi-Year and Multi-User network coding
  interface
• Automatic communication of network changes from
  regional agencies
• Integration with Other Datasets (TIP and
  transportation infrastructure geodatabases)
• Display/Update of Year Information on the Web
• Extending coverage of roadway network to the full
  16-county NCTCOG area

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Network Updates
2007
2008
2009
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GIS Database Integration
Multi-Year Transportation Geodatabase
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Questions?
Thank You!