examples/gallery/src/contour-layer.html

<html>
  <head>
    <title>deck.gl ContourLayer Example</title>

    <script src="https://unpkg.com/deck.gl@^9.0.0/dist.min.js"></script>
    <script src='https://unpkg.com/maplibre-gl@3.6.0/dist/maplibre-gl.js'></script>

    <link href='https://unpkg.com/maplibre-gl@3.6.0/dist/maplibre-gl.css' rel='stylesheet' />
    <style type="text/css">
      body {
        width: 100vw;
        height: 100vh;
        margin: 0;
      }
    </style>
  </head>

  <body></body>

  <script type="text/javascript">
    const {DeckGL, ContourLayer} = deck;

    new DeckGL({
      mapStyle: 'https://basemaps.cartocdn.com/gl/dark-matter-nolabels-gl-style/style.json',
      initialViewState: {
        longitude: -119.3,
        latitude: 35.6,
        zoom: 6,
        maxZoom: 20
      },
      controller: true,
      layers: [
        new ContourLayer({
          id: 'contourLayer',
          data:
            'https://raw.githubusercontent.com/visgl/deck.gl-data/master/examples/screen-grid/ca-transit-stops.json',
          getPosition: d => d,
          contours: [
            {threshold: 1, color: [255, 0, 0], strokeWidth: 4},
            {threshold: 5, color: [0, 255, 0], strokeWidth: 2},
            {threshold: [6, 10], color: [0, 0, 255, 128]}
          ]
        })
      ]
    });
  </script>
</html>