GIS is a system that captures, stores, manipulates, analyzes, manages, and presents geographical data. It merges cartography, statistical analysis, and database technology, allowing users to store, edit, analyze, share and display geographic information to make decisions. GIS can be used to map where things are located, quantities and densities of items, find what's nearby or inside a location, map changes over time, and analyze data through making maps with multiple layers of information. DeKalb County utilizes GIS for stormwater analysis and management.

1. Geographical Information
Systems
GIS and You

2. What is GIS?
• GIS is a system designed to
capture, store, manipulate, analyze, manage
and present all types of geographical data.
• GIS merges cartography, statistical
analysis, and database technology.
– You can store, edit, analyze, share and display
geographic information.
– You can use the information in a GIS database to
make decisions.

3. But, What Is GIS Really?
• GIS is
– Google Maps
– Google Earth
– MapQuest
– Your map on your phone’s navigation system

4. What Can You Do With GIS?
• Map where things are:
Arabia Mountain HS

5. What Else Can You Do With GIS?
• Map quantities:

6. Is There Anything Else You can Do
With GIS?
• Map Densities:
Customer Density
Hay quantities Woody areas

7. There’s More You Can Do With
GIS?
• Find what’s inside:

8. What Can You Do With GIS?
• Find what’s nearby: You are here

9. That’s A Lot, Is This the Last One?
• Map change:
Hurricane Isaac’s Projected Movement

10. How To Make A Map
• A GIS map is made up of one or more
layers:

11. DeKalb County Uses of GIS for
Analysis

12. Questions??

13. Contact Information
• Angel Jones – Stormwater Program Supervisor
– 404-297-4464; darjones@dekalbcountyga.gov
– 727 Camp Rd. Decatur, GA 30032
• David Chastant – Stormwater Engineering Supervisor
– 404-371-4066; dbchastant@dekalbcountyga.gov
– 330 W. Ponce De Leon Ave 3rd Fl Decatur, GA 30030
• Michael O’Shield – Public Education Specialist
– 770-724-1456; msoshield@dekalbcountyga.gov
– 1580 Roadhaven Drive Stone Mountain, GA 30083
• ESRI - ArcGIS Explorer free download:
http://www.esri.com/software/arcgis/explorer/download