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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| <!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="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://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, topology) { | |
| 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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