This symbol map encodes the area of each county using a circle at the county's centroid.
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County Circles
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| circle { | |
| fill: none; | |
| stroke: steelblue; | |
| } | |
| </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 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.selectAll("circle") | |
| .data(topojson.feature(us, us.objects.counties).features) | |
| .enter().append("circle") | |
| .attr("transform", function(d) { return "translate(" + path.centroid(d) + ")"; }) | |
| .attr("r", function(d) { return Math.sqrt(path.area(d) / Math.PI); }); | |
| }); | |
| </script> |
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