Published
Edited
Mar 1, 2022
2 stars
Insert cell
Insert cell
Insert cell
Insert cell
Insert cell
Insert cell
saveableData = source
Insert cell
height = 600
Insert cell
mesh = d3
.geoVoronoi(data.map(({ longitude, latitude }) => [longitude, latitude]))
.cellMesh()
Insert cell
polygons = {
const polygons = voronoi.polygons(),
{ features } = polygons;
for (const [i, feature] of features.entries()) {
feature.properties.color =
(d3.max(neighbors[i], j => features[j].properties.color) + 1) | 0;
}
return polygons;
}
Insert cell
neighbors = voronoi.delaunay.neighbors
Insert cell
voronoi = d3.geoVoronoi(
shuffle(data.map(({ longitude, latitude }) => [longitude, latitude]))
)
Insert cell
shuffle = {
data;
return d3.shuffler(d3.randomLcg(0.9051667019185816));
}
Insert cell
colors = d3.schemeTableau10
Insert cell
data = d3.csvParseRows(source, ([name, longitude, latitude]) => ({
name,
longitude: +longitude,
latitude: +latitude
}))
Insert cell
cityData = {
const cityData = await d3.csv(
"https://data.cdc.gov/api/views/dxpw-cm5u/rows.csv",
({ PlaceName: city, Geolocation: loc, Population2010: pop }) => [
city,
+loc.replace(")", "").split(",")[1],
+loc.replace("(", "").split(",")[0],
+pop
]
);
return cityData.filter(d => d[3] > 500000).map(d => d.slice(0, 3));
}
Insert cell
projection = d3
.geoAlbers()
.scale(1280)
.translate([480, 300])
Insert cell
states = ({
type: "GeometryCollection",
geometries: us.objects.states.geometries.filter(
d => d.id !== "02" && d.id !== "15"
)
})
Insert cell
us = d3.json("https://cdn.jsdelivr.net/npm/us-atlas@1/us/10m.json")
Insert cell
topojson = require("topojson-client@3")
Insert cell
d3 = require("d3", "d3-geo-voronoi@1")
Insert cell
Insert cell
Insert cell

One platform to build and deploy the best data apps

Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
Seamlessly deploy to Observable. Test before you ship, use automatic deploy-on-commit, and ensure your projects are always up-to-date.
Learn more