1. Sidewalk Gap Analysis
Langdon Sanders
Atlanta Regional GIS User Group
December 8th, 2016

2. Where are the gaps in sidewalk access?
The Sandy Springs City Council requested an analysis of sidewalk connectivity.
All city streets were classified by sidewalk access with an initial focus on
Sidewalk Master Plan streets.

3. Selection Criteria & Process
● On Master Plan
● Public Street Centerline
● Sidewalk Access (one side, both sides, or none)
● By Street Name
● No breaks at intersections
● GIS segments combined

4. Eyes from above
Aerial imagery from
January 2015 was used
to determine current
sidewalk access.
(Thank you Fulton County!)

5. Converting
Centerline to Gaps
How many feet of
sidewalk do we need?
Estimating gap lengths along the
shoulder from centerlines

6. One side Access
118’ centerline segment
x 1 gap
=
118’ sidewalk needed
There is one gap for each
segment and the length
of sidewalk is the same.

7. No Sidewalks
84’ centerline segment
x 2 gaps
=
168’ of sidewalk needed
There are two gaps for
each segment so the
length must be doubled

8. Sidewalk Master Plan Streets

9. Sidewalk Coverage for Master Plan Streets

10. Sidewalk Coverage of All Streets in City

12. Identifying Targets
Gaps of less than 200
feet can typically be filled
for less than $50,000.

13. Projects and Reports

14. Sharing Results and Data

15. Contact
Langdon Sanders, MPA
GIS Analyst
LSanders@sandyspringsga.gov
770-206-2084