Reverse geocode

Learn how to convert coordinates to addresses with the .

Reverse geocode coordinates to addresses with the geocoding service using API key authentication

Reverse geocoding is the process of converting a to an address or . To reverse geocode, you use the and the reverseGeocode operation. This operation requires an initial location and returns an address with attributes such as place name and location.

Esri Leaflet provides a geocoder to access the geocoding service. In this tutorial, you use the reverseGeocode operation to reverse geocode and find the closest address to your clicked location on the map.

Prerequisites

Steps

Get the starter app

Select a type of authentication below and follow the steps to create a new application.

You can choose one of the following to create a new CodePen:

  • Option 1: Complete the Display a map tutorial; or,
  • Option 2: Start from the Display a map tutorial .

Set up authentication

Create in your for the type of authentication you selected.

Create a new with to access the resources used in this tutorial.

  1. Go to the Create an API key tutorial and create an with the following :
    • Privileges
      • Location services > Basemaps
      • Location services > Geocoding
  2. When prompted, copy and paste the API key to a safe location. It will be used in the next step.

Set developer credentials

Use the API key or OAuth so your application can access .

  1. Update the accessToken variable to use your API key.

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      <script>
    
        /* Use for API key authentication */
        const accessToken = "YOUR_ACCESS_TOKEN";
    
        const map = L.map("map", {
          minZoom: 2
        })
    
        map.setView([34.02, -118.805], 13);
    
        const basemapEnum = "arcgis/streets";
    
        L.esri.Vector.vectorBasemapLayer(basemapEnum, {
          token: accessToken
        }).addTo(map);
    
      </script>
    

Reference the geocoder

  1. Reference the Esri Leaflet Geocoder plugin.

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      <!-- Load Leaflet from CDN -->
      <link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css" crossorigin="" />
      <script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js" crossorigin=""></script>
      <!-- Load Esri Leaflet from CDN -->
      <script src="https://unpkg.com/esri-leaflet@3.0.14/dist/esri-leaflet.js"></script>
      <script src="https://unpkg.com/esri-leaflet-vector@4.2.7/dist/esri-leaflet-vector.js"></script>
    
      <!-- Load Esri Leaflet Geocoder from CDN -->
      <script src="https://unpkg.com/esri-leaflet-geocoder@3.1.4/dist/esri-leaflet-geocoder.js"></script>
    
    Expand

Update the map

A navigation is typically used in geocoding and routing applications. Update the basemap layer to use arcgis/navigation.

  1. Update the basemap style and change the map view to center on location [2.3522,48.8566], Paris.

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        /* Use for API key authentication */
        const accessToken = "YOUR_ACCESS_TOKEN";
    
        // or
    
        /* Use for user authentication */
        // const session = await arcgisRest.ArcGISIdentityManager.beginOAuth2({
        //   clientId: "YOUR_CLIENT_ID", // Your client ID from OAuth credentials
        //   redirectUri: "YOUR_REDIRECT_URI", // The redirect URL registered in your OAuth credentials
        //   portal: "YOUR_PORTAL_URL" // Your portal URL
        // })
    
        // const accessToken = session.token;
    
        const basemapEnum = "arcgis/navigation";
    
        const map = L.map("map", {
          minZoom: 2
        })
    
        map.setView([48.8566, 2.3522], 13); // Paris
    
        L.esri.Vector.vectorBasemapLayer(basemapEnum, {
          token: accessToken
        }).addTo(map);
    
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Call the geocoding service

  1. Create a click handler that will call the geocoding service when a user clicks on the map.

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        L.esri.Vector.vectorBasemapLayer(basemapEnum, {
          token: accessToken
        }).addTo(map);
    
        map.on("click", function (e) {
    
        });
    
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  2. Call the reverseGeocode operation and set your accessToken. Set the latlng to the LatLng of the location where the user clicks.

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        map.on("click", function (e) {
    
          L.esri.Geocoding
            .reverseGeocode({
              apikey: accessToken
            })
            .latlng(e.latlng)
    
        });
    
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  3. Execute the request using run and handle any errors within the callback function.

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        map.on("click", function (e) {
    
          L.esri.Geocoding
            .reverseGeocode({
              apikey: accessToken
            })
            .latlng(e.latlng)
    
            .run(function (error, result) {
              if (error) {
                return;
              }
    
            });
    
        });
    
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Display the result

The response from the operation contains the of an address or . Use the results to display them in a Popup.

  1. Add a LayerGroup to the map to contain reverse geocoding results. Call the clearLayers method to remove previous results.

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        const layerGroup = L.layerGroup().addTo(map);
    
        map.on("click", function (e) {
    
          L.esri.Geocoding
            .reverseGeocode({
              apikey: accessToken
            })
            .latlng(e.latlng)
    
            .run(function (error, result) {
              if (error) {
                return;
              }
    
              layerGroup.clearLayers();
    
            });
    
        });
    
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  2. Create a Marker at the result coordinates and add it to the layerGroup.

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        const layerGroup = L.layerGroup().addTo(map);
    
        map.on("click", function (e) {
    
          L.esri.Geocoding
            .reverseGeocode({
              apikey: accessToken
            })
            .latlng(e.latlng)
    
            .run(function (error, result) {
              if (error) {
                return;
              }
    
              layerGroup.clearLayers();
    
              const marker = L.marker(result.latlng).addTo(layerGroup);
    
            });
    
        });
    
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  3. Add a lngLatString variable that stores the rounded search result coordinates. Append the bindPopup method to the marker to display the coordinates and address of the result.

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        const layerGroup = L.layerGroup().addTo(map);
    
        map.on("click", function (e) {
    
          L.esri.Geocoding
            .reverseGeocode({
              apikey: accessToken
            })
            .latlng(e.latlng)
    
            .run(function (error, result) {
              if (error) {
                return;
              }
    
              layerGroup.clearLayers();
    
              const marker = L.marker(result.latlng).addTo(layerGroup);
    
              const lngLatString = `${Math.round(result.latlng.lng * 100000) / 100000}, ${Math.round(result.latlng.lat * 100000) / 100000}`;
    
              marker.bindPopup(`<b>${lngLatString}</b><p>${result.address.Match_addr}</p>`);
              marker.openPopup();
    
            });
    
        });
    
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Run the app

Run the app.

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:

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