A9 Choropleth Map in D3

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A9 Choropleth Map in D3

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Last edited Apr 2, 2024

Created on Feb 18, 2024

This example displays a choropleth map of poverty rates across U.S. counties, using a sequential blue color scale to encode percentages from 0 to 100. It loads county boundaries from the TopoJSON `us-10m.v1.json` dataset and merges them with CSV data containing poverty estimates. The map is rendered as SVG paths via `d3.geoPath` with an AlbersUSA projection fit to the viewport, while `d3.scaleSequential` with `d3.interpolateBlues` determines each county’s fill color.

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MIT Licensed

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