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Last active August 21, 2023 08:45
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Symbol Map
license: gpl-3.0

The area of each circle in this symbol map is proportional to the population of the associated state.

<!DOCTYPE html>
<meta charset="utf-8">
<style>
.states {
fill: #ccc;
stroke: #fff;
}
.symbol {
fill: steelblue;
fill-opacity: .8;
stroke: #fff;
}
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script src="//d3js.org/queue.v1.min.js"></script>
<script>
var width = 960,
height = 500;
var radius = d3.scale.sqrt()
.domain([0, 1e6])
.range([0, 10]);
var path = d3.geo.path();
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
queue()
.defer(d3.json, "/mbostock/raw/4090846/us.json")
.defer(d3.json, "us-state-centroids.json")
.await(ready);
function ready(error, us, centroid) {
if (error) throw error;
svg.append("path")
.attr("class", "states")
.datum(topojson.feature(us, us.objects.states))
.attr("d", path);
svg.selectAll(".symbol")
.data(centroid.features.sort(function(a, b) { return b.properties.population - a.properties.population; }))
.enter().append("path")
.attr("class", "symbol")
.attr("d", path.pointRadius(function(d) { return radius(d.properties.population); }));
}
</script>
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