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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.

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Centerline update project

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
Statewide Centerline Update Project Local Centerline Mileage

  • In January 2011 GDOT Commissioner Vance Smith sent a letter to every one of Georgia’s

    • 159 Counties

  • 531 Cities


Statewide centerline update project local centerline mileage1
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 mileage2
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 mileage3
Statewide Centerline Update Project Local Centerline Mileage

153 Counties (96%)

and

328 Municipalities (61%)

have reported


Statewide centerline update project local centerline mileage4
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 mileage5
Statewide Centerline Update Project Local Centerline Mileage

  • Other uses include…

  • Creating County maps

  • Certified Mileage for Federal Reporting


Centerline update project1

Centerline Update Project

Updating Centerline Mileage Data


Statewide centerline update project project scope
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


Statewide centerline update project source data
Statewide Centerline Update Project Source Data

  • 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 data issues
Statewide Centerline Update Project Data Issues

  • Roads that Extend Beyond/Stop Short of County Boundary


Statewide centerline update project data issues1
Statewide Centerline Update Project Data Issues

  • Out-of-Date

The World of Coca-Cola

The Georgia Aquarium

--

Opened 2005


Statewide centerline update project data issues2
Statewide Centerline Update Project Data Issues

  • After Updates

The World of Coca-Cola

The Georgia Aquarium

--

Opened 2005


Statewide centerline update project data issues3
Statewide Centerline Update Project Data Issues

  • Bad Centerline Geometry


Statewide centerline update project data issues4
Statewide Centerline Update Project Data Issues

  • Inaccurate Geometry

BEFORE


Statewide centerline update project data issues5
Statewide Centerline Update Project Data Issues

  • After Updates

AFTER


Statewide centerline update project data issues6
Statewide Centerline Update Project Data Issues

  • “Unknown Roads” (Route Type = U)


Statewide centerline update project data issues7
Statewide Centerline Update Project Data Issues

  • Topological Errors

  • (Overlapping & Intersecting Road Segments, Dangles, Pseudo-nodes)


Statewide centerline update project data issues8
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


Statewide centerline update project fulton county data update
Statewide Centerline Update Project Fulton County Data Update

Fulton County Mileage – GDOT Data

20092010 GISDifference

State Routes 415 377 -31

County Roads 1,249 592 -622

City Streets 1,796 3,213 +1,412


Statewide centerline update project data update
Statewide Centerline Update Project Data Update

2009 Reported

1,643

66

97

251

180

348

316

2010 GIS

1,507

65

99

227

189

354

305

Difference

- 136

-1

+2

-24

+9

+6

-11

Mileage in some Fulton Cities

Atlanta

College Park

Fairburn

Johns Creek

Milton

Roswell

SandySprings


Statewide centerline update project current project status
Statewide Centerline Update Project Current Project Status

  • 5 Counties Complete

  • 38 Counties In Progress


Statewide centerline update project primary project goals
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
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 Contacts

Michael D. Morris

[email protected]

770-986-1366

Douglas Alexander

[email protected]

770-986-1436



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