29:null 2a:["$","title",null,{"children":"Vector tiles | D3 | Observable"}] 2f:[] 2d:{"id":"27823d7d147e66d4","slug":"vector-tiles","title":"Vector tiles","thumbnail":"f2dcbb1b5015af98b2a9265d9e05f49547765866ae4c27310007b74384f34824","access_level":"public","create_time":"$D2018-04-23T15:31:57.301Z","update_time":"$D2023-10-26T10:44:53.235Z","view_time":null,"first_public_time":"$D2018-04-23T15:57:24.475Z","fork":false,"stars":43,"starred":false,"owner":{"type":"team","id":"863951e3ebe4c0ae","login":"d3","name":"D3","avatar_url":"https://avatars-next.observableusercontent.com/5af16e327a90b2873351dda8a596c0d2d3bf954f64523deefe80177c9764d0f7","tier":"pro_2024"},"version":135,"publish_version":null,"role":null,"authored":false,"authors":[{"type":"individual","id":"074c414ad1d825f5","login":"mbostock","name":"Mike Bostock","avatar_url":"https://avatars-next.observableusercontent.com/7dbba99ced40bd5ab8013c99b1a11da61231bce321ba1148a9d16ad0f121550a","tier":null}],"members":[{"type":"team","id":"863951e3ebe4c0ae","login":"d3","name":"D3","avatar_url":"https://avatars-next.observableusercontent.com/5af16e327a90b2873351dda8a596c0d2d3bf954f64523deefe80177c9764d0f7","tier":"pro_2024","role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"subscribed":null,"forks":86,"collection":{"id":"271c421a5537aab2","slug":"d3-tile","title":"d3-tile","owner":{"id":"863951e3ebe4c0ae","login":"d3","name":"D3"}},"type":"notebook","body":{"title":"Vector tiles","cells":[{"id":0,"value":"

Vector tiles

D3 › Gallery

\n\n# Vector tiles\n\nThis notebook demonstrates using [d3-tile](https://github.com/d3/d3-tile) to display [Mercator-projected](https://d3js.org/d3-geo/cylindrical#geoMercator) [GeoJSON](https://d3js.org/d3-geo/path#geoPath) vector tiles. The vector tiles are provided by [Nextzen](https://www.nextzen.org/) and require an API key.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined"},{"id":3,"value":"map = svg``","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":28,"value":"tiles = Promise.all(tile().map(async d => {\n d.data = await fetch(`https://tile.nextzen.org/tilezen/vector/v1/256/all/${d[2]}/${d[0]}/${d[1]}.json?api_key=SAI-dMzMQ866u3VyVAntDg`).then(response => response.json()); // Sign up for an API key: https://www.nextzen.org\n return d;\n}))","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":10,"value":"tile = d3.tile()\n .size([width, height])\n .scale(projection.scale() * 2 * Math.PI)\n .translate(projection([0, 0]))","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":16,"value":"projection = d3.geoMercator()\n .center([-122.4183, 37.7750])\n .scale(Math.pow(2, 21) / (2 * Math.PI))\n .translate([width / 2, height / 2])","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":84,"value":"function filter({features}, test) {\n return {type: \"FeatureCollection\", features: features.filter(test)};\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":20,"value":"path = d3.geoPath(projection)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":14,"value":"height = 600","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":5,"value":"d3 = require(\"d3-geo@3\", \"d3-tile@1\")","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"}],"files":"$W2f","stdlib":"1","titling":"auto"}} 2e:"$2d:body"