Learn how to find an address near a location with the geocoding service.
Reverse geocode coordinates to addresses with the geocoding service.
Reverse geocoding is the process of converting a location to an address or place. To reverse geocode, you use the Geocoding service and the reverse operation. This operation requires an initial location and returns an address with attributes such as place name and location.
In this tutorial, you use the reverse method of ArcGIS REST JS to reverse geocode and find the closest address to your clicked location on the map.
Prerequisites
You need an ArcGIS Location Platform or ArcGIS Online account.
Steps
Create a new pen
- To get started, either complete the Display a map tutorial or .
Get an access token
You need an access token with the correct privileges to access the resources used in this tutorial.
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Go to the Create an API key tutorial and create an API key with the following privilege(s):
- Privileges
- Location services > Basemaps
- Location services > Geocoding
- Privileges
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Copy the API key access token to your clipboard when prompted.
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In CodePen, update the
accessvariable to use your access token.Token Use dark colors for code blocks const accessToken = "YOUR_ACCESS_TOKEN"; const basemapEnum = "arcgis/streets"; const map = new maplibregl.Map({ container: "map", // the id of the div element style: `https://basemapstyles-api.arcgis.com/arcgis/rest/services/styles/v2/styles/${basemapEnum}?token=${accessToken}`, zoom: 12, // starting zoom center: [-118.805, 34.027] // starting location [longitude, latitude] });
To learn about the other types of authentication available, go to Types of authentication.
Add references to ArcGIS REST JS
This tutorial uses ArcGIS REST JS for reverse geocoding.
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In the
<headelement, add references to the ArcGIS REST JS library.> Use dark colors for code blocks <head> <meta charset="utf-8" /> <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" /> <script src=https://unpkg.com/maplibre-gl@4/dist/maplibre-gl.js></script> <link href=https://unpkg.com/maplibre-gl@4/dist/maplibre-gl.css rel="stylesheet" /> <script src="https://unpkg.com/@esri/arcgis-rest-request@4/dist/bundled/request.umd.js"></script> <script src="https://unpkg.com/@esri/arcgis-rest-geocoding@4/dist/bundled/geocoding.umd.js"></script>
Update the map
A navigation basemap layer is typically used in geocoding and routing applications. Update the basemap layer to use arcgis/navigation.
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Update the basemap and the map initialization to center on location
[2.3522,48.8566], Paris.Use dark colors for code blocks <script> const accessToken = "YOUR_ACCESS_TOKEN"; const basemapEnum = "arcgis/navigation"; const map = new maplibregl.Map({ container: "map", style: `https://basemapstyles-api.arcgis.com/arcgis/rest/services/styles/v2/styles/${basemapEnum}?token=${accessToken}`, zoom: 12, center: [2.3522, 48.8566] // Paris }); </script>
Add a click event handler
Before you call the Geocoding service, you need to get a location from the user. You can add a handler to the Map's click event. The click handler will be called with an object containing parameters such as lng.
The lng property is a Lng. It has lng and lat properties and a to method which returns an array in [longitude, latitude] order.
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After the map initialization code, add a handler for the
clickevent. Create a coordinates array from thelngproperty of the event parameter.Lat Use dark colors for code blocks <script> const accessToken = "YOUR_ACCESS_TOKEN"; const basemapEnum = "arcgis/navigation"; const map = new maplibregl.Map({ container: "map", style: `https://basemapstyles-api.arcgis.com/arcgis/rest/services/styles/v2/styles/${basemapEnum}?token=${accessToken}`, zoom: 12, center: [2.3522, 48.8566] // Paris }); map.on("click", (e) => { const coords = e.lngLat.toArray(); }); </script>
Call the service
Use the ArcGIS REST JS reverse method to find an address closest to a point.
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Inside the click handler, create a new
arcgisto access the geocoding service. Call theRest. Api Key Manager arcgismethod with the coordinates array.Rest.reverse Geocode Use dark colors for code blocks map.on("click", (e) => { const coords = e.lngLat.toArray(); const authentication = arcgisRest.ApiKeyManager.fromKey(accessToken); arcgisRest .reverseGeocode(coords, { authentication }) .then((result) => { });
Display the result
The response from the reverse operation contains two properties. address is a structured object with fields such as street name and business name. location contains the location of the returned address, which may differ from the coordinates you provided.
Use the results to display a pop-up with the address and location values.
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Convert the
result.locationobject into an array of[longitude, latitude].Use dark colors for code blocks arcgisRest .reverseGeocode(coords, { authentication }) .then((result) => { const lngLat = [result.location.x, result.location.y]; -
Set a variable containing the text you want to display, using the address and coordinates.
Use dark colors for code blocks const lngLat = [result.location.x, result.location.y]; const label = `${result.address.LongLabel}<br>${lngLat[0].toLocaleString()}, ${lngLat[1].toLocaleString()}`; }) -
Add a pop-up to display the label at the returned coordinates.
To add a pop-up to the map, you use the
Popupclass in MapLibre GL JS. See the Display a pop-up tutorial for more information.Use dark colors for code blocks const lngLat = [result.location.x, result.location.y]; const label = `${result.address.LongLabel}<br>${lngLat[0].toLocaleString()}, ${lngLat[1].toLocaleString()}`; new maplibregl.Popup().setLngLat(lngLat).setHTML(label).addTo(map); })
Handle errors
To handle errors that occur when accessing the Geocoding service, such as networking or API key issues, use an error handler to show a message to the user.
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Add a handler to catch any exception and display a message to the user.
Use dark colors for code blocks const authentication = arcgisRest.ApiKeyManager.fromKey(accessToken); arcgisRest .reverseGeocode(coords, { authentication }) .then((result) => { const lngLat = [result.location.x, result.location.y]; const label = `${result.address.LongLabel}<br>${lngLat[0].toLocaleString()}, ${lngLat[1].toLocaleString()}`; new maplibregl.Popup().setLngLat(lngLat).setHTML(label).addTo(map); }) .catch((error) => { alert("There was a problem using the reverse geocode service. See the console for details."); console.error(error); });
Run the app
In CodePen, run your code to display the map.
Click on the map to reverse geocode the clicked point and display a pop-up with the closest address and coordinates.
What's next?
Learn how to use additional ArcGIS location services in these tutorials:
