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Quick answers
When should I pick Choropleth story maps?
When the story is: regional comparisons, civics assignments, territory KPIs.
When should I avoid Choropleth story maps?
Skip it in cases like: raw counts without normalizing by population or area.
Who invented or popularised it?
Baron Charles Dupin (1826); modern TopoJSON + D3 geo pipelines
What does it encode?
color of administrative regions mapped to a quantitative rate
Is it OK in ads?
Yes if one claim is visible at a glance in Meta, Google and retail print; otherwise link to a full figure.
Will a teacher accept it?
Yes for lab reports and poster boards if axes, units and a source line are present.
Choropleth story maps encodes values as color of administrative regions mapped to a quantitative rate. Baron Charles Dupin (1826); modern TopoJSON + D3 geo pipelines.
In reports, ads and assignments it fits regional comparisons, civics assignments, territory KPIs. Skip it when raw counts without normalizing by population or area.
Principles
- Encoding — The core mark of Choropleth story maps is color of administrative regions mapped to a quantitative rate.
- History — Baron Charles Dupin (1826); modern TopoJSON + D3 geo pipelines
- Fit — regional comparisons, civics assignments, territory KPIs
- Shared baseline — The eye compares length and position more accurately than area.
- Audience — PowerPoint, Excel or Google Sheets and Meta, Google and retail print share the same geometry.
Misconceptions
- Pretty equals true — Decoration rarely persuades; it slows reading.
- 3-D helps — Perspective distortion wrecks comparison. Keep it flat.
- More series is richer — Do not stack stories. One Choropleth story maps, one claim.
- Default palette is fine — Rainbow defaults fail color-blind viewers and grey print. Change Excel or Google Sheets defaults.
Why it matters
- Work — Work: regional comparisons, civics assignments, territory KPIs. Readable in four minutes in PowerPoint.
- Ads — Ads: one number and one shape speak first in Meta, Google and retail print.
- School — School: for lab reports and poster boards, pick the form that answers the rubric.
- Craft — Craft: honour color of administrative regions mapped to a quantitative rate and decoration falls away.
Choropleth story maps: honour color of administrative regions mapped to a quantitative rate, and switch when raw counts without normalizing by population or area.