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Presented to GIS Committee presented by Eric Songer, URS Corporation 11/20/2008 Turnpike Enterprise Use of TeleAtlas GIS Data for Transportation Modeling.

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Presentation on theme: "Presented to GIS Committee presented by Eric Songer, URS Corporation 11/20/2008 Turnpike Enterprise Use of TeleAtlas GIS Data for Transportation Modeling."— Presentation transcript:

1 presented to GIS Committee presented by Eric Songer, URS Corporation 11/20/2008 Turnpike Enterprise Use of TeleAtlas GIS Data for Transportation Modeling

2 1 Agenda Context What we did What we are doing Where we believe we should go Discussion

3 2 Context “Data Driven” Approach GIS database is key Start with best available data Refine and constantly correct data Modelers and GIS Analysts work closely Hand off point is fluid Modelers use ArcGIS to edit database

4 3 TeleAtlas Data for Transportation Modeling What We Did Turnpike State Model TeleAtlas “features” Spatial/Geometry Issues Attribute Issues

5 4 Turnpike State Model Statewide County Building Blocks Used shapefiles from TeleAtlas Duplicate arcs removed Chaining of arcs done in Fennessy’s software

6 5 TeleAtlas “Features” Duplicate arcs to represent multiple names County basis has duplicate arcs between counties Attribute fields not needed for modeling Attributes needed for modeling Unique ID field Dynamap_ID

7 6

8 7 Spatial Geometry Issues Duplicate arcs cause headaches Geometry links up in 3 dimensions Does not contain every road Does not contain future roads

9 8 Attribute Issues Occasional errors (don’t assume they’re correct) FZLEV or TZLEV = -9 are duplicate arcs Does not have capacity, counts, and network identification Has address and labeling information

10 9 Lessons Learned Separate county files are logistic problem Never missed duplicate arcs or discarded fields Need to have capability to “Check in” numerous editors versions Maintenance, Maintenance, Maintenance… Can’t rely on anybody’s data “as is” or you will be wrong Modelers can edit in ArcGIS with little training

11 10 TeleAtlas Data for Transportation Modeling What We Are Currently Doing Context Versioned ESRI geodatabase Model runs are snapshots of database

12 11 Context Regional Models (Lee-Collier, Central Florida) Continual refinement of all processes Lee-Collier complete Central Florida being built

13 12 Versioned ESRI Geodatabase Personal ArcSDE (SQL Server Express) Editors get Personal GDB (Access based) Checked in by data administrator No longer separate county files

14 13 Model Run Snapshots Shapefile is exported for input to model Separate shapefiles for Existing and Future conditions Shapefile and associated model files can be archived

15 14 Lessons Learned Tradeoff between speed and duplication The Devil is in the details You are never done It can always be better

16 15 TeleAtlas Data for Transportation Modeling Where we are going Routine Maintenance of Data Regular Updates of TeleAtlas Transaction File Many small updates True Geodatabase or Route System Basis Finished Models are Archived as Snapshots/Versions

17 16 Regular Maintenance Get quarterly updates as Transaction Files Automate update where appropriate Expect we will always need to manually fix some areas

18 17 True Geodatabase Believe a cascading update structure can be built Better way to store data Spatial views Versioning

19 18 Archiving Multiple dimensions to problem of archiving Not only documentation Need to be able to resurrect that model for future work

20 19 Food for Thought Arcs must be “Chained” Doesn’t need to be done in model software Data Driven and Model Centric approaches both have tradeoffs Data side is constantly being updated by third party

21 20 Questions ? Eric Songer


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