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Choropleth with Histogram Brushing

✓ Published9🌍 Public
CCurran Kelleher
Last edited Oct 9, 2025
Created on Aug 14, 2024

This interactive data visualization displays the unemployment rate by U.S. county for August 2016. A choropleth map uses a quantile color scale with four bins, rendered via `d3.geoPath` and the `geo-albers-usa-territories` projection. A linked histogram below the map, built with `d3.bin` and `d3.brushX`, allows users to brush a range of values, which highlights matching counties on the map while dimming others. The visualization also supports zooming through the `d3.zoom` utility, with map rendering optimized using memoization.

AI-generated description

An adaptation of the D3 Choropleth Example that uses vanilla JavaScript and adds a brushable histogram. Shows Unemployment rate by U.S. county, August 2016. Modified to add zooming, leveraging utilities from d3-rosetta.

MIT Licensed

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