About this project
Project overview
Data visualization plays a critical role in transforming raw demographic data into meaningful spatial insights. In this project, Spatial Nexus delivered a comprehensive choropleth mapping solution using population data from the U.S. Census Bureau, focusing on all 159 counties in Georgia.
As a GIS Analyst, the objective was to design a comparative choropleth map series that highlights how different classification methods influence the interpretation of spatial patterns. Using ArcGIS 10.8, four distinct maps were created to ensure analytical depth and visual consistency.
- choropleth map
- GIS data visualization
- ArcGIS classification methods
- natural breaks Jenks
- census population mapping
Project at a glance
- Client
- Research and data visualisation
- Sector
- Demographics
- Location
- Georgia, USA (159 counties)
- Software
- ArcGIS 10.8, Population Data, GIS Classification Techniques
THE CHALLENGE
What needed solving
- The same population data can tell very different stories depending on how it is classified.
- Non-specialists rarely see how classification choices influence a map.
- Four maps needed identical styling so differences came only from the method.
OBJECTIVES
What the project set out to do
- Map population for all 159 counties in Georgia, USA.
- Compare Equal Interval, Quantile, Natural Breaks (Jenks) and Standard Deviation classification.
- Keep consistent cartographic design across the series.
- Deliver a clean, professional PDF map series.
Methodology
Our workflow, step by step
01
Data preparation
Census population figures were joined to county boundaries and checked for completeness.
02
Classification
Four maps were produced using Equal Interval, Quantile, Natural Breaks (Jenks) and Standard Deviation methods.
03
Consistent styling
A shared colour scheme, legend design and layout ensured a fair visual comparison.
04
Layout and export
The four maps were arranged in a single comparative series and exported as a high-quality PDF.
Visual output
The map
Select the image to view it at full size.
Results
What the analysis delivered
- A side-by-side series that shows clearly how classification shapes interpretation.
- Natural Breaks and Quantile maps highlight different patterns from the same data.
- A reusable reference for teaching and reporting on thematic mapping.
Key highlights
Why this project stands out
- Four classification methods compared
- All 159 Georgia counties
- Consistent professional styling
- High-quality PDF deliverable
Data sources
Data used
- U.S. Census Bureau population data
- Georgia county boundaries (159 counties)
Tools and technologies
Software and methods
Deliverables
What the client received
- Comparative choropleth map series (PDF)
- Prepared GIS dataset
- Classification notes
WHY IT MATTERS
Choosing the right classification method prevents misleading maps. This series makes those choices transparent for analysts, students and decision-makers.
FAQ
Questions about this project
What is a choropleth map?
A thematic map that shades areas such as counties according to a data value, for example population.
Which classification method is best?
It depends on the data distribution and purpose. Natural Breaks suits clustered data, Quantile gives equal counts per class, and Equal Interval is easiest to read.
Which software was used?
ArcGIS 10.8 for analysis, classification and map production.
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