Note: the counties aren’t clipped to water boundaries, so they look a bit weird and the corresponding density calculation is inaccurate. So don’t copy this example without fixing those problems first, ok? See the us-atlas project for a more comprehensive Makefile of examples, and the projected choropleth example for a better style. Also, you’ll want to add a legend for the color scale.
To build this example, git clone
this repo, npm install
, and then make
.
https://d3js.org/d3.v3.min.js
https://d3js.org/topojson.v1.min.js