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@mbostock
Forked from mbostock/.block
Last active Apr 17, 2021
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U.S. Counties TopoJSON
license: gpl-3.0
height: 600
border: no
redirect: https://observablehq.com/@d3/u-s-map
<!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>
@eflowbeach
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eflowbeach commented Apr 13, 2017

For zooming, var path = d3.geoPath(d3.geoIdentity().translate([-3300, -1100]).scale(5));

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