This choropleth encodes the area of each county using color on a log scale from red to blue.
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Area Choropleth
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .states { | |
| fill: none; | |
| stroke: #fff; | |
| stroke-linejoin: round; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script src="//d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var fill = d3.scale.log() | |
| .domain([10, 500]) | |
| .range(["white", "rgb(38, 93, 171)"]); | |
| var path = d3.geo.path(); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| d3.json("/mbostock/raw/4090846/us.json", function(error, us) { | |
| if (error) throw error; | |
| svg.append("g") | |
| .attr("class", "counties") | |
| .selectAll("path") | |
| .data(topojson.feature(us, us.objects.counties).features) | |
| .enter().append("path") | |
| .attr("d", path) | |
| .style("fill", function(d) { return fill(path.area(d)); }); | |
| svg.append("path") | |
| .datum(topojson.mesh(us, us.objects.states, function(a, b) { return a.id !== b.id; })) | |
| .attr("class", "states") | |
| .attr("d", path); | |
| }); | |
| </script> |
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