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Reprojecting Vector Tiles
land = ({
type: "FeatureCollection",
features: d3.merge(tiles.map(d => !d.layers.earth ? [] : geojson(d, d.layers.earth).features))
})
import { map } with { land } from "@fil/base-map"
srcprojection = d3.geoMercator()
.scale(1024 / (2 * Math.PI))
.translate([width / 2, height / 2])
tiles = Promise.all(
tile().map(async (d) => {
const [x, y, z] = d;
d.layers = new VectorTile(
new Protobuf(
await d3
.buffer(
`https://tile.nextzen.org/tilezen/vector/v1/256/all/${z}/${x}/${y}.mvt?api_key=${apikey}`
)
.catch((_) => ({}))
)
).layers; // Sign up for an API key: https://www.nextzen.org
return d;
})
)
tile = d3.tile()
.size([width, height])
.scale(srcprojection.scale() * 2 * Math.PI)
.translate(srcprojection([0, 0]))
function geojson([x, y, z], layer) {
if (!layer) return;
const features = new Array(layer.length);
for (let i = 0; i < layer.length; ++i)
features[i] = layer.feature(i).toGeoJSON(x, y, z);
return resample({ type: "FeatureCollection", features });
}
VectorTile = (await require("https://bundle.run/@mapbox/vector-tile@1.3.1"))
.VectorTile
Protobuf = require("pbf@3.1.0/dist/pbf.js")
d3 = require("d3@7", "d3-tile@1")
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