Define a rendering rule

This sample defines a rendering rule to dynamically modify and display the raster data from an image service.

Rendering rules are created using a pre-defined set of raster functions. This example shows a raster image generated from raw LIDAR (Light Detection and Ranging) data rendered with a hillshade. To learn more about defining rules, visit L.esri.ImageMapLayer in the API reference.

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<html>
  <head>
    <meta charset="utf-8" />
    <title>Define a rendering rule</title>
    <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no" />
    <link rel="stylesheet" href="https://unpkg.com/leaflet@1.8.0/dist/leaflet.css" crossorigin="" />
    <script src="https://unpkg.com/leaflet@1.8.0/dist/leaflet.js" crossorigin=""></script>
    <!-- Load Esri Leaflet from CDN -->
    <script src="https://unpkg.com/esri-leaflet@^3.0.8/dist/esri-leaflet.js"></script>
    <!-- Load Esri Leaflet Vector from CDN -->
    <script src="https://unpkg.com/esri-leaflet-vector@3.1.3/dist/esri-leaflet-vector.js" crossorigin=""></script>
    <style>
      html,
      body,
      #map {
        padding: 0;
        margin: 0;
        height: 100%;
        width: 100%;
        font-family: Arial, Helvetica, sans-serif;
        font-size: 14px;
        color: #323232;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <script>
      const apiKey = "YOUR_API_KEY";

      const renderingRule = {
        rasterFunction: "TorontoFalseColor",
        variableName: "Raster"
      };

      const map = L.map("map").setView([43.645262, -79.38], 14);

      L.esri.Vector.vectorBasemapLayer("ArcGIS:Imagery", {
        apikey: apiKey
      }).addTo(map);

      L.esri
        .imageMapLayer({
          url: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Toronto/ImageServer",
          renderingRule: renderingRule,
          useCors: false
        })
        .addTo(map);
    </script>
  </body>
</html>

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