This map demonstrates the TopoJSON us-atlas. The same TopoJSON file can also be used to show states.
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U.S. Counties TopoJSON
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| license: gpl-3.0 | |
| height: 600 | |
| border: no | |
| redirect: https://observablehq.com/@d3/u-s-map |
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| <!DOCTYPE html> | |
| <style> | |
| .counties :hover { | |
| fill: red; | |
| } | |
| .county-borders { | |
| fill: none; | |
| stroke: #fff; | |
| stroke-width: 0.5px; | |
| stroke-linejoin: round; | |
| stroke-linecap: round; | |
| pointer-events: none; | |
| } | |
| </style> | |
| <svg width="960" height="600"></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 path = d3.geoPath(); | |
| d3.json("https://d3js.org/us-10m.v1.json", function(error, us) { | |
| if (error) throw error; | |
| svg.append("g") | |
| .attr("class", "counties") | |
| .selectAll("path") | |
| .data(topojson.feature(us, us.objects.counties).features) | |
| .enter().append("path") | |
| .attr("d", path); | |
| svg.append("path") | |
| .attr("class", "county-borders") | |
| .attr("d", path(topojson.mesh(us, us.objects.counties, function(a, b) { return a !== b; }))); | |
| }); | |
| </script> |
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For zooming, var path = d3.geoPath(d3.geoIdentity().translate([-3300, -1100]).scale(5));