Transcript GDOT OTD Presentation to ARC RGUG 8-7-11

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
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 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 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
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
 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 Out-of-Date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
 Inaccurate Geometry
BEFORE
Statewide Centerline Update Project
Data Issues
 After Updates
AFTER
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
Statewide Centerline Update Project
Fulton County Data Update
Fulton County Mileage – GDOT Data
2009
State Routes
2010 GIS
Difference
415
377
-31
County Roads 1,249
592
-622
3,213
+1,412
City Streets
1,796
Statewide Centerline Update Project
Data Update
Mileage in some Fulton Cities
Atlanta
College Park
Fairburn
Johns Creek
Milton
Roswell
Sandy Springs
2009 Reported
2010 GIS
Difference
1,643
66
97
251
180
348
316
1,507
65
99
227
189
354
305
- 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
Michael D. Morris
[email protected]
[email protected]
770-986-1436
770-986-1366