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Last edited Nov 17, 2019

Created on Nov 17, 2019

This visualization displays population density per square mile across U.S. census block groups using a choropleth map. A threshold color scale with d3.schemeOrRd maps density values to sequential red tones, while a legend with a sqrt scale and axis shows the breakpoints. The code loads TopoJSON data via d3.json, renders block group polygons with d3.geoPath, and overlays county boundaries as black outlines. An interactive legend is constructed with rect elements and d3.axisBottom.

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From https://bl.ocks.org/almccon/113e1d690bfe61ab10c1612fdf063c85

MIT Licensed

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