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mbostock/.block

Last active August 11, 2022 21:42
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U.S. States TopoJSON
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.block
license: gpl-3.0
height: 600
border: no
redirect: https://observablehq.com/@d3/u-s-map
Raw
README.md
Raw
index.html
<!DOCTYPE html>
<style>
.states :hover {
fill: red;
}
.state-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", "states")
.selectAll("path")
.data(topojson.feature(us, us.objects.states).features)
.enter().append("path")
.attr("d", path);
svg.append("path")
.attr("class", "state-borders")
.attr("d", path(topojson.mesh(us, us.objects.states, function(a, b) { return a !== b; })));
});
</script>
@TheDuelist
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for what stands this?:
.attr("class", "states")

and
.attr("class", "state-borders")

@nro-bot
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nro-bot commented Aug 11, 2022

@Ognami: not sure if you found the solution, but I had the same problem. The IDs weren't ordered alphabetically or statehood, but by their ANSI standardized code. You can find the codes here: https://www2.census.gov/geo/docs/reference/state.txt

And if you want to match county polygons to their names: https://www2.census.gov/geo/docs/reference/codes/files/national_county.txt

THANKS!! Searched for an hour for this... I was looking at altair vega's us by income plot (https://altair-viz.github.io/gallery/us_incomebrackets_by_state_facet.html) and could not figure out what the key='id' meant, I definitely thought it was alphabetical but then wasn't confident what happens to e.g. District of Columbia. Not sure how I found this but much appreciated

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