Hello h3-js / Fil | Observable

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Hello h3-js

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Geo

h3 = require("h3-js@3")

h3.UNITS

h3Address = h3.geoToH3(37.3615593, -122.0553238, zoom)

hexCenterCoordinates = h3.h3ToGeo(h3Address)

hexBoundary = h3.h3ToGeoBoundary(h3Address)

// Get all neighbors within 1 step of the hexagon

kRing = h3.kRing(h3Address, 1)

// Get the set of hexagons within a polygon

hexagons = {

const hexagons = h3.polyfill(

triangle.coordinates[0]

.slice(0, -1)

.map((d) => [d[1], d[0]])

.reverse(),

zoom

);

// Get the outline of a set of hexagons, as a GeoJSON-style MultiPolygon

return h3

.h3SetToMultiPolygon(hexagons, true)

.map((hex) => [hex[0].reverse()]);

}

d3 = require("d3@7")

// note: This doesn't deal with holes, luckily our geometry doesnt have any.

poly = d3.merge(

california.geometry.coordinates.map((d) =>

h3.polyfill(

d[0].slice(0, -1).map((d) => [d[1], d[0]]),

)

hexworld = level => ({

type: "FeatureCollection",

features: h3

.getRes0Indexes()

.map(i => h3.h3ToChildren(i, level))

.flat()

.map(d => ({

type: "Feature",

properties: { id: d, pentagon: h3.h3IsPentagon(d) },

geometry: {

type: "Polygon",

coordinates: [h3.h3ToGeoBoundary(d, true).reverse()]

}

}))

})

hexworld(2)

h3.numHexagons(4)

projection = d3.geoMercator()

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