Overlaying an Image Map Type

This example uses image tiles to overlay an image that represents the interior of a building onto the map.

TypeScript

function initMap(): void {
  const map = new google.maps.Map(
    document.getElementById("map") as HTMLElement,
    {
      zoom: 18,
      center: { lat: 37.783, lng: -122.403 },
    }
  );

  const bounds: Record<number, [[number, number], [number, number]]> = {
    17: [
      [20969, 20970],
      [50657, 50658],
    ],
    18: [
      [41939, 41940],
      [101315, 101317],
    ],
    19: [
      [83878, 83881],
      [202631, 202634],
    ],
    20: [
      [167757, 167763],
      [405263, 405269],
    ],
  };

  const imageMapType = new google.maps.ImageMapType({
    getTileUrl: function (coord, zoom) {
      if (
        zoom < 17 ||
        zoom > 20 ||
        bounds[zoom][0][0] > coord.x ||
        coord.x > bounds[zoom][0][1] ||
        bounds[zoom][1][0] > coord.y ||
        coord.y > bounds[zoom][1][1]
      ) {
        return "";
      }

      return [
        "https://www.gstatic.com/io2010maps/tiles/5/L2_",
        zoom,
        "_",
        coord.x,
        "_",
        coord.y,
        ".png",
      ].join("");
    },
    tileSize: new google.maps.Size(256, 256),
  });

  map.overlayMapTypes.push(imageMapType);
}index.ts

JavaScript

function initMap() {
  const map = new google.maps.Map(document.getElementById("map"), {
    zoom: 18,
    center: { lat: 37.783, lng: -122.403 },
  });
  const bounds = {
    17: [
      [20969, 20970],
      [50657, 50658],
    ],
    18: [
      [41939, 41940],
      [101315, 101317],
    ],
    19: [
      [83878, 83881],
      [202631, 202634],
    ],
    20: [
      [167757, 167763],
      [405263, 405269],
    ],
  };
  const imageMapType = new google.maps.ImageMapType({
    getTileUrl: function (coord, zoom) {
      if (
        zoom < 17 ||
        zoom > 20 ||
        bounds[zoom][0][0] > coord.x ||
        coord.x > bounds[zoom][0][1] ||
        bounds[zoom][1][0] > coord.y ||
        coord.y > bounds[zoom][1][1]
      ) {
        return "";
      }
      return [
        "https://www.gstatic.com/io2010maps/tiles/5/L2_",
        zoom,
        "_",
        coord.x,
        "_",
        coord.y,
        ".png",
      ].join("");
    },
    tileSize: new google.maps.Size(256, 256),
  });
  map.overlayMapTypes.push(imageMapType);
}
index.js

CSS

/* Always set the map height explicitly to define the size of the div
       * element that contains the map. */
#map {
  height: 100%;
}

/* Optional: Makes the sample page fill the window. */
html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}
style.css

HTML

<!DOCTYPE html>
<html>
  <head>
    <title>Overlaying an Image Map Type</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script src="./index.js"></script>
  </head>
  <body>
    <div id="map"></div>

    <!-- Async script executes immediately and must be after any DOM elements used in callback. -->
    <script
      src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly"
      async
    ></script>
  </body>
</html>sample.html

All

<!DOCTYPE html>
<html>
  <head>
    <title>Overlaying an Image Map Type</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <style type="text/css">
      /* Always set the map height explicitly to define the size of the div
       * element that contains the map. */
      #map {
        height: 100%;
      }

      /* Optional: Makes the sample page fill the window. */
      html,
      body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
    </style>
    <script>
      function initMap() {
        const map = new google.maps.Map(document.getElementById("map"), {
          zoom: 18,
          center: { lat: 37.783, lng: -122.403 },
        });
        const bounds = {
          17: [
            [20969, 20970],
            [50657, 50658],
          ],
          18: [
            [41939, 41940],
            [101315, 101317],
          ],
          19: [
            [83878, 83881],
            [202631, 202634],
          ],
          20: [
            [167757, 167763],
            [405263, 405269],
          ],
        };
        const imageMapType = new google.maps.ImageMapType({
          getTileUrl: function (coord, zoom) {
            if (
              zoom < 17 ||
              zoom > 20 ||
              bounds[zoom][0][0] > coord.x ||
              coord.x > bounds[zoom][0][1] ||
              bounds[zoom][1][0] > coord.y ||
              coord.y > bounds[zoom][1][1]
            ) {
              return "";
            }
            return [
              "https://www.gstatic.com/io2010maps/tiles/5/L2_",
              zoom,
              "_",
              coord.x,
              "_",
              coord.y,
              ".png",
            ].join("");
          },
          tileSize: new google.maps.Size(256, 256),
        });
        map.overlayMapTypes.push(imageMapType);
      }
    </script>
  </head>
  <body>
    <div id="map"></div>

    <!-- Async script executes immediately and must be after any DOM elements used in callback. -->
    <script
      src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly"
      async
    ></script>
  </body>
</html>
inline.html

/* Always set the map height explicitly to define the size of the div * element that contains the map. */ #map { height: 100%; } /* Optional: Makes the sample page fill the window. */ html, body { height: 100%; margin: 0; padding: 0; }

<!DOCTYPE html> <html> <head> <title>Overlaying an Image Map Type</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>  </head> <body> <div id="map"></div>  <script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBIwzALxUPNbatRBj3Xi1Uhp0fFzwWNBkE&callback=initMap&libraries=&v=weekly" async ></script> </body> </html>

Create a starter application from sample

A skeleton starter application using TypeScript, Webpack, and Babel can be generated from this sample using one of the methods below.

Run Locally

Node.js is required to run this sample locally. Follow these instructions to install Node.js and NPM.

npx @googlemaps/js-samples init maptype-image-overlay DESTINATION_FOLDER

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