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Choropleth Maps

✓ Published2🌍 Public
PPranay Matalia
Last edited Apr 12, 2022
Created on Apr 12, 2022
Forked from HTML Starter

This choropleth map displays the percentage of adults with a bachelor’s degree or higher across U.S. counties for 2015–19, using a purple sequential color scale (d3.schemePurples) with a threshold legend. County boundaries are drawn via d3.geoPath, while state outlines are rendered as white meshes using topojson.mesh. Hovering a county highlights it with a black stroke via mouseover/mouseleave transitions. The data merges TopoJSON geographic shapes with CSV values keyed by FIPS codes, and the visualization is built with React and SVG inside a D3 v5 environment.

AI-generated description

A bare minimum HTML page demonstrating use of CSS and JavaScript.

See also React Starter.

MIT Licensed

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