# Data Layer: Polygon

This example uses the Data layer to create a polygon with two internal holes. If you don't use the data layer to create an inner hole, you must define a path wound in the opposite direction to the outer path as shown in this alternative.

### TypeScript

```// This example uses the Google Maps JavaScript API's Data layer
// to create a rectangular polygon with 2 holes in it.

function initMap(): void {
const map = new google.maps.Map(
document.getElementById("map") as HTMLElement,
{
zoom: 6,
center: { lat: -33.872, lng: 151.252 },
}
);

// Define the LatLng coordinates for the outer path.
const outerCoords = [
{ lat: -32.364, lng: 153.207 }, // north west
{ lat: -35.364, lng: 153.207 }, // south west
{ lat: -35.364, lng: 158.207 }, // south east
{ lat: -32.364, lng: 158.207 }, // north east
];

// Define the LatLng coordinates for an inner path.
const innerCoords1 = [
{ lat: -33.364, lng: 154.207 },
{ lat: -34.364, lng: 154.207 },
{ lat: -34.364, lng: 155.207 },
{ lat: -33.364, lng: 155.207 },
];

// Define the LatLng coordinates for another inner path.
const innerCoords2 = [
{ lat: -33.364, lng: 156.207 },
{ lat: -34.364, lng: 156.207 },
{ lat: -34.364, lng: 157.207 },
{ lat: -33.364, lng: 157.207 },
];

outerCoords,
innerCoords1,
innerCoords2,
]),
});
}

declare global {
interface Window {
initMap: () => void;
}
}
window.initMap = initMap;index.ts```

### JavaScript

```// This example uses the Google Maps JavaScript API's Data layer
// to create a rectangular polygon with 2 holes in it.
function initMap() {
const map = new google.maps.Map(document.getElementById("map"), {
zoom: 6,
center: { lat: -33.872, lng: 151.252 },
});
// Define the LatLng coordinates for the outer path.
const outerCoords = [
{ lat: -32.364, lng: 153.207 }, // north west
{ lat: -35.364, lng: 153.207 }, // south west
{ lat: -35.364, lng: 158.207 }, // south east
{ lat: -32.364, lng: 158.207 }, // north east
];
// Define the LatLng coordinates for an inner path.
const innerCoords1 = [
{ lat: -33.364, lng: 154.207 },
{ lat: -34.364, lng: 154.207 },
{ lat: -34.364, lng: 155.207 },
{ lat: -33.364, lng: 155.207 },
];
// Define the LatLng coordinates for another inner path.
const innerCoords2 = [
{ lat: -33.364, lng: 156.207 },
{ lat: -34.364, lng: 156.207 },
{ lat: -34.364, lng: 157.207 },
{ lat: -33.364, lng: 157.207 },
];

outerCoords,
innerCoords1,
innerCoords2,
]),
});
}

window.initMap = initMap;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;
}
style.css```

### HTML

```<html>
<title>Data Layer: Polygon</title>

<link rel="stylesheet" type="text/css" href="./style.css" />
<script type="module" src="./index.js"></script>
<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
-->
<script
defer
></script>
</body>
</html>index.html```

### Clone Sample

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.

```  `git clone -b sample-layer-data-polygon https://github.com/googlemaps/js-samples.git`
`cd js-samples`
`npm i`
`npm start`
```

Other samples can be tried by switching to any branch beginning with `sample-SAMPLE_NAME`.

```  `git checkout sample-SAMPLE_NAME`
`npm i`
`npm start`
```
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