These county, state and country boundaries are extracted from a single TopoJSON file. Counties are stroked in thin gray, states in thin black, and the country in thick black.
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U.S. TopoJSON
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
path { | |
fill: none; | |
stroke: #000; | |
stroke-width: .5px; | |
} | |
.land-boundary { | |
stroke-width: 1px; | |
} | |
.county-boundary { | |
stroke: #aaa; | |
} | |
</style> | |
<body> | |
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
<script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.19/topojson.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, topology) { | |
if (error) throw error; | |
svg.append("path") | |
.datum(topojson.feature(topology, topology.objects.land)) | |
.attr("d", path) | |
.attr("class", "land-boundary"); | |
svg.append("path") | |
.datum(topojson.mesh(topology, topology.objects.counties, function(a, b) { return a !== b && (a.id / 1000 | 0) === (b.id / 1000 | 0); })) | |
.attr("d", path) | |
.attr("class", "county-boundary"); | |
svg.append("path") | |
.datum(topojson.mesh(topology, topology.objects.states, function(a, b) { return a !== b; })) | |
.attr("d", path) | |
.attr("class", "state-boundary"); | |
}); | |
</script> |
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