/* * 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;}
<html>
<head>
<title>Overlaying an Image Map Type</title>
<link rel="stylesheet" type="text/css" href="./style.css" />
<script type="module" src="./index.js"></script>
</head>
<body>
<div id="map"></div>
<!--
The `defer` attribute causes the script to execute after the full HTML
document has been parsed. For non-blocking uses, avoiding race conditions,
and consistent behavior across browsers, consider loading using Promises. See
https://developers.google.com/maps/documentation/javascript/load-maps-js-api
for more information.
-->
<script
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&v=weekly"
defer
></script>
</body>
</html>
Git and Node.js are required to run this sample locally. Follow these instructions to install Node.js and NPM. The following commands clone, install dependencies and start the sample application.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-28 UTC."],[[["\u003cp\u003eThis example demonstrates how to overlay an image representing a building's interior onto a Google Map using image tiles.\u003c/p\u003e\n"],["\u003cp\u003eIt utilizes the \u003ccode\u003egoogle.maps.ImageMapType\u003c/code\u003e class to define the image overlay and its tile coordinates.\u003c/p\u003e\n"],["\u003cp\u003eThe code provides functionality to fetch and display image tiles within specified zoom levels and bounds.\u003c/p\u003e\n"],["\u003cp\u003eA predefined set of image tiles is used, and the example showcases how to integrate them with the map.\u003c/p\u003e\n"],["\u003cp\u003eUsers can explore the interactive example via provided links to JSFiddle and Google Cloud Shell, or clone the sample code for local execution.\u003c/p\u003e\n"]]],[],null,["This example uses image tiles to overlay an image that represents the interior\nof a building onto the map.\n\nRead the\n[documentation](/maps/documentation/javascript/maptypes#CustomMapTypes). \n\nTypeScript \n\n```typescript\nfunction initMap(): void {\n const map = new google.maps.Map(\n document.getElementById(\"map\") as HTMLElement,\n {\n zoom: 18,\n center: { lat: 37.783, lng: -122.403 },\n }\n );\n\n const bounds: Record\u003cnumber, [[number, number], [number, number]]\u003e = {\n 17: [\n [20969, 20970],\n [50657, 50658],\n ],\n 18: [\n [41939, 41940],\n [101315, 101317],\n ],\n 19: [\n [83878, 83881],\n [202631, 202634],\n ],\n 20: [\n [167757, 167763],\n [405263, 405269],\n ],\n };\n\n const imageMapType = new google.maps.ImageMapType({\n getTileUrl: function (coord, zoom) {\n if (\n zoom \u003c 17 ||\n zoom \u003e 20 ||\n bounds[zoom][0][0] \u003e coord.x ||\n coord.x \u003e bounds[zoom][0][1] ||\n bounds[zoom][1][0] \u003e coord.y ||\n coord.y \u003e bounds[zoom][1][1]\n ) {\n return \"\";\n }\n\n return [\n \"https://www.gstatic.com/io2010maps/tiles/5/L2_\",\n zoom,\n \"_\",\n coord.x,\n \"_\",\n coord.y,\n \".png\",\n ].join(\"\");\n },\n tileSize: new google.maps.Size(256, 256),\n });\n\n map.overlayMapTypes.push(imageMapType);\n}\n\ndeclare global {\n interface Window {\n initMap: () =\u003e void;\n }\n}\nwindow.initMap = initMap;https://github.com/googlemaps/js-samples/blob/2683f7366fb27829401945d2a7e27d77ed2df8e5/samples/maptype-image-overlay/index.ts#L8-L70\n```\n| **Note:** Read the [guide](/maps/documentation/javascript/using-typescript) on using TypeScript and Google Maps.\n\nJavaScript \n\n```javascript\nfunction initMap() {\n const map = new google.maps.Map(document.getElementById(\"map\"), {\n zoom: 18,\n center: { lat: 37.783, lng: -122.403 },\n });\n const bounds = {\n 17: [\n [20969, 20970],\n [50657, 50658],\n ],\n 18: [\n [41939, 41940],\n [101315, 101317],\n ],\n 19: [\n [83878, 83881],\n [202631, 202634],\n ],\n 20: [\n [167757, 167763],\n [405263, 405269],\n ],\n };\n const imageMapType = new google.maps.ImageMapType({\n getTileUrl: function (coord, zoom) {\n if (\n zoom \u003c 17 ||\n zoom \u003e 20 ||\n bounds[zoom][0][0] \u003e coord.x ||\n coord.x \u003e bounds[zoom][0][1] ||\n bounds[zoom][1][0] \u003e coord.y ||\n coord.y \u003e bounds[zoom][1][1]\n ) {\n return \"\";\n }\n return [\n \"https://www.gstatic.com/io2010maps/tiles/5/L2_\",\n zoom,\n \"_\",\n coord.x,\n \"_\",\n coord.y,\n \".png\",\n ].join(\"\");\n },\n tileSize: new google.maps.Size(256, 256),\n });\n\n map.overlayMapTypes.push(imageMapType);\n}\n\nwindow.initMap = initMap;https://github.com/googlemaps/js-samples/blob/2683f7366fb27829401945d2a7e27d77ed2df8e5/dist/samples/maptype-image-overlay/docs/index.js#L7-L58\n```\n| **Note:** The JavaScript is compiled from the TypeScript snippet.\n\nCSS \n\n```css\n/* \n * Always set the map height explicitly to define the size of the div element\n * that contains the map. \n */\n#map {\n height: 100%;\n}\n\n/* \n * Optional: Makes the sample page fill the window. \n */\nhtml,\nbody {\n height: 100%;\n margin: 0;\n padding: 0;\n}\nhttps://github.com/googlemaps/js-samples/blob/2683f7366fb27829401945d2a7e27d77ed2df8e5/dist/samples/maptype-image-overlay/docs/style.css#L7-L24\n```\n\nHTML \n\n```html\n\u003chtml\u003e\n \u003chead\u003e\n \u003ctitle\u003eOverlaying an Image Map Type\u003c/title\u003e\n\n \u003clink rel=\"stylesheet\" type=\"text/css\" href=\"./style.css\" /\u003e\n \u003cscript type=\"module\" src=\"./index.js\"\u003e\u003c/script\u003e\n \u003c/head\u003e\n \u003cbody\u003e\n \u003cdiv id=\"map\"\u003e\u003c/div\u003e\n\n \u003c!-- \n The `defer` attribute causes the script to execute after the full HTML\n document has been parsed. For non-blocking uses, avoiding race conditions,\n and consistent behavior across browsers, consider loading using Promises. See\n https://developers.google.com/maps/documentation/javascript/load-maps-js-api\n for more information.\n --\u003e\n \u003cscript\n src=\"https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&v=weekly\"\n defer\n \u003e\u003c/script\u003e\n \u003c/body\u003e\n\u003c/html\u003ehttps://github.com/googlemaps/js-samples/blob/2683f7366fb27829401945d2a7e27d77ed2df8e5/dist/samples/maptype-image-overlay/docs/index.html#L8-L30\n```\n\nTry Sample \n[JSFiddle.net](https://jsfiddle.net/gh/get/library/pure/googlemaps/js-samples/tree/master/dist/samples/maptype-image-overlay/jsfiddle) [Google Cloud Shell](https://ssh.cloud.google.com/cloudshell/editor?cloudshell_git_repo=https%3A%2F%2Fgithub.com%2Fgooglemaps%2Fjs-samples&cloudshell_git_branch=sample-maptype-image-overlay&cloudshell_tutorial=cloud_shell_instructions.md&cloudshell_workspace=.)\n\nClone Sample\n\n\nGit and Node.js are required to run this sample locally. Follow these [instructions](https://docs.npmjs.com/downloading-and-installing-node-js-and-npm) to install Node.js and NPM. The following commands clone, install dependencies and start the sample application. \n\n git clone -b sample-maptype-image-overlay https://github.com/googlemaps/js-samples.git\n cd js-samples\n npm i\n npm start\n\n\nOther samples can be tried by switching to any branch beginning with `sample-`\u003cvar translate=\"no\"\u003eSAMPLE_NAME\u003c/var\u003e. \n\n git checkout sample-\u003cvar translate=\"no\"\u003e\u003cspan class=\"devsite-syntax-nx\"\u003eSAMPLE_NAME\u003c/span\u003e\u003c/var\u003e\n npm i\n npm start"]]