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Centerline Update Project. Reporting Local Centerline Mileage Atlanta Regional Commission Regional GIS User Group September 7, 2011. Georgia Department of Transportation Office of Transportation Data. Statewide Centerline Update Project Local Centerline Mileage. - PowerPoint PPT Presentation
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Georgia Department of Transportation Georgia Department of Transportation Office of Transportation DataOffice of Transportation Data
Reporting Local Centerline MileageReporting Local Centerline MileageAtlanta Regional CommissionAtlanta Regional Commission
Regional GIS User GroupRegional GIS User GroupSeptember 7, 2011 September 7, 2011
Statewide Centerline Update Project Local Centerline Mileage
In January 2011 GDOT Commissioner Vance Smith sent a letter to every one of Georgia’s
159 Counties531 Cities
Statewide Centerline Update Project Local Centerline Mileage
GDOT asked for… The total number of miles of
Local Public Roads owned by each local government; as measured by Centerline Miles
Statewide Centerline Update Project Local Centerline Mileage
Georgia Code 32-4-41(4) and 32-4-91(b)says that all Local Governments must Inform GDOT when they:
Acquire/Accept a road
or Abandon a road
Statewide Centerline Update Project Local Centerline Mileage
153 Counties (96%)and
328 Municipalities (61%)have reported
Statewide Centerline Update Project Local Centerline Mileage
GDOT is required by state law to keep this information for calculating funding levels of…
Transportation Investment Act of 2010 (TIA)
Local Maintenance Improvement Grants (LMIG)
Statewide Centerline Update Project Local Centerline Mileage
Other uses include…
Creating County maps
Certified Mileage for Federal Reporting
Updating Centerline Mileage DataUpdating Centerline Mileage Data
Statewide Centerline Update Project Project Scope
Implement New Centerline Data Model Bring Data Completely Up-to-Date By
Adding, Modifying & Removing Roads Cleanse Data - Resolve Various Issues Ensure Clean Topology Validate Local Mileage Totals Provide Data Back To Local Agencies
GDOT’s most current road centerline, bridge and railroad crossing data
Local GIS street and city/county boundary data
2010 Census TIGER street/boundary data
Orthophotography (various sources)
Statewide Centerline Update Project Source Data
Statewide Centerline Update Project Data Issues
Roads that Extend Beyond/Stop Short of County Boundary
Statewide Centerline Update Project Data Issues
Out-of-Date
The Georgia
Aquarium--
Opened 2005
The World of
Coca-Cola
Statewide Centerline Update Project Data Issues
After Updates
The Georgia
Aquarium--
Opened 2005
The World of
Coca-Cola
Statewide Centerline Update Project Data Issues
Bad Centerline Geometry
Statewide Centerline Update Project Data Issues
BEFORE
Inaccurate Geometry
Statewide Centerline Update Project Data Issues
AFTER
After Updates
Statewide Centerline Update Project Data Issues
“Unknown Roads” (Route Type = U)
Statewide Centerline Update Project Data Issues
Topological Errors (Overlapping & Intersecting Road Segments, Dangles, Pseudo-nodes)
Statewide Centerline Update Project Data Issues
Erroneous/Incomplete Ownership Assignment (County Roads, City Streets, Private Roads, Etc.)
Roads Traversing City/County Boundaries
Various RC Coding Errors
Fulton County Mileage – GDOT Data
2009 2010 GIS Difference
State Routes 415 377 -31
County Roads 1,249 592 -622
City Streets 1,796 3,213 +1,412
Statewide Centerline Update Project Fulton County Data Update
Mileage in some Fulton Cities
Statewide Centerline Update Project Data Update
AtlantaCollege Park FairburnJohns CreekMiltonRoswellSandy Springs
2009 Reported
1,6436697
251180348316
2010 GIS
1,5076599
227189354305
Difference
- 136-1+2
-24+9+6
-11
Statewide Centerline Update Project Current Project Status
5 Counties Complete 38 Counties In Progress
Statewide Centerline Update Project Primary Project Goals
Establish & Maintain Complete and Accurate Statewide Road Centerline Data Ensure Appropriate Mileages For All Local Agencies Reduce the need for field data collection Perform event-driven updates Foster A Cooperative Environment Build Working Relationships With Local Governments
Statewide Centerline Update Project How Can You Help?
Provide Digital (GIS) Street & Boundary Data; Imagery Share Street Attribute Data Assist With Identifying Road Ownership (City, County, Private, Other) Assist With Resolving Boundary Road Issues Be Available To GDOT for Consultations Via Phone, E-Mail or Face-to-Face Meetings Work With GDOT & Neighboring Agencies To Resolve
Conflicts
Statewide Centerline Update Project Q&A
Statewide Centerline Update Project Contacts
Douglas Alexander
dalexander@dot.ga.gov
770-986-1436
Michael D. Morris
mimorris@dot.ga.gov
770-986-1366
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