Choropleth

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Last edited Mar 27, 2017

Created on Mar 23, 2017

This choropleth map visualizes reported Lyme disease cases across U.S. counties from 2000 to 2015, using a threshold color scale to encode incidence rates from light to dark orange. A slider animates through each year, updating the map's fill colors, while hovering over a county displays a tooltip with the reported case counts for 2000 and 2015, plus the change between them. The visualization is built with D3.js (v3), using the `d3.geo.albersUsa` projection, `topojson` for geographic data, and `d3.scale.threshold` for color mapping, with data sourced from the CDC.

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forked from <a href='http://bl.ocks.org/dougdowson/'>dougdowson</a>'s block: <a href='http://bl.ocks.org/dougdowson/9832019'>Choropleth</a>

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