lbmap/simple_org.html at main · yoichigmf/lbmap · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta content="text/html; charset=utf-8" http-equiv="Content-Type"/>
    <link href="https://unpkg.com/maplibre-gl@2.1.9/dist/maplibre-gl.css" rel="stylesheet" />
    <script src="https://unpkg.com/maplibre-gl@2.1.9/dist/maplibre-gl.js"></script>
    <script src="https://unpkg.com/flatgeobuf@3.22.0/dist/flatgeobuf-geojson.min.js"></script>
    <style>
        #map { height: 480px; }
    </style>
</head>
<body>
    <div id="map"></div>
    <script type="module">
        const map = new maplibregl.Map({
            container: "map",
            style: "https://demotiles.maplibre.org/style.json",
            center: [-80.09, 41.505],
            zoom: 3,
            maxZoom: 8,
        });

        const response = await fetch("https://flatgeobuf.org/test/data/UScounties.fgb")
        map.on("load", async () => {
            const fc = {type: "FeatureCollection", features: []};
            for await (const f of flatgeobuf.deserialize(response.body))
                fc.features.push(f);

            map.addSource("counties", {
               type: "geojson",
               data: fc,
            });
            map.addLayer({
                id: "counties-fill",
                type: "fill",
                source: "counties",
                paint: {
                  "fill-color": "#0000FF",
                  "fill-opacity": 0.2,
                },
            });
            map.addLayer({
                id: "counties-line",
                type: "line",
                source: "counties",
                paint: {
                  "line-color": "#0000FF",
                  "line-opacity": 0.9,
                  "line-width": 2,
                },
            });
        });
    </script>
</body>
</html>