> For the complete documentation index, see [llms.txt](https://docs.mapbox.com/mapbox-gl-js/llms.txt)
# Add a georeferenced image
This example overlays a georeferenced historical image on top of a Mapbox map.
**Georeferencing** is the process of assigning geographic coordinates to a raster image to define its location in the world based on a map coordinate system.
The georeferenced image used in this example is from a [historical map of Portland, Oregon](https://www.loc.gov/resource/g4293m.la000694/) provided by the [Library of Congress](https://www.loc.gov/). You can georeference using a free, open-source tool like QGIS. To learn more, see the [QGIS georeferencing tutorial](http://www.qgistutorials.com/en/docs/3/georeferencing_basics.html). To use a georeferenced image in a Mapbox map, [upload it as a tileset](https://docs.mapbox.com/studio-manual/reference/tilesets/) to Mapbox, then add it to your map using [`addSource`](https://docs.mapbox.com/mapbox-gl-js/api/map/#map#addsource).
> Example code:
**JavaScript**
```html
Add a georeferenced image
```
**React**
```jsx
import React, { useEffect, useRef } from 'react';
import * as mapboxgl from 'mapbox-gl/esm';
import 'mapbox-gl/dist/mapbox-gl.css';
const MapboxExample = () => {
const mapContainerRef = useRef();
const mapRef = useRef();
useEffect(() => {
mapRef.current = new mapboxgl.Map({
// TO MAKE THE MAP APPEAR YOU MUST
// ADD YOUR ACCESS TOKEN FROM
// https://account.mapbox.com
accessToken: 'YOUR_MAPBOX_ACCESS_TOKEN',
container: mapContainerRef.current,
style: 'mapbox://styles/mapbox/standard',
center: [-122.619991, 45.536023],
zoom: 10.5
});
mapRef.current.on('load', () => {
mapRef.current.addSource('portland', {
type: 'raster',
url: 'mapbox://examples.32xkp0wd'
});
mapRef.current.addLayer({
id: 'portland',
source: 'portland',
type: 'raster'
});
});
return () => mapRef.current.remove();
}, []);
return ;
};
export default MapboxExample;
```