These county, state and country boundaries are extracted from a single TopoJSON file from us-atlas. See also the non-fancy variant.
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U.S. TopoJSON
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| license: gpl-3.0 | |
| height: 600 | |
| border: no |
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| <!DOCTYPE html> | |
| <svg width="960" height="600" stroke-linejoin="round" stroke-linecap="round"> | |
| <defs> | |
| <filter id="blur"> | |
| <feGaussianBlur stdDeviation="5"></feGaussianBlur> | |
| </filter> | |
| </defs> | |
| </svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://d3js.org/topojson.v2.min.js"></script> | |
| <script> | |
| var svg = d3.select("svg"); | |
| var defs = svg.select("defs"); | |
| var path = d3.geoPath(); | |
| d3.json("https://d3js.org/us-10m.v1.json", function(error, us) { | |
| if (error) throw error; | |
| defs.append("path") | |
| .attr("id", "nation") | |
| .attr("d", path(topojson.feature(us, us.objects.nation))); | |
| svg.append("use") | |
| .attr("xlink:href", "#nation") | |
| .attr("fill-opacity", 0.2) | |
| .attr("filter", "url(#blur)"); | |
| svg.append("use") | |
| .attr("xlink:href", "#nation") | |
| .attr("fill", "#fff"); | |
| svg.append("path") | |
| .attr("fill", "none") | |
| .attr("stroke", "#777") | |
| .attr("stroke-width", 0.35) | |
| .attr("d", path(topojson.mesh(us, us.objects.counties, function(a, b) { return (a.id / 1000 | 0) === (b.id / 1000 | 0); }))); | |
| svg.append("path") | |
| .attr("fill", "none") | |
| .attr("stroke", "#777") | |
| .attr("stroke-width", 0.70) | |
| .attr("d", path(topojson.mesh(us, us.objects.states, function(a, b) { return a !== b; }))); | |
| }); | |
| </script> |
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