D3 Choropleth Starter

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D3 Choropleth Starter

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Last edited Apr 16, 2025

Created on Apr 16, 2025

A choropleth map of United States county unemployment rates, colored with a blue threshold scale. The map displays each county as a path, with hover tooltips showing the exact rate. The visualization loads county boundaries and unemployment data via Promises, then renders them using D3's `geoPath` and TopoJSON feature extraction. A legend with an axis shows the color scale, while state borders are drawn as a white mesh overlay.

AI-generated description

Modified version of Bostock's Choropleth example. Upgraded from d3v4 to d3v7.

MIT Licensed

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