Query a feature layer (spatial)

Learn how to execute a spatial query.

Make a spatial query using API key authentication

A can contain a large number of stored in . To access a subset of these features, you can execute an SQL or spatial query, either together or individually. The results can contain the , , or both for each record. SQL and spatial queries are useful when a feature layer is very large and you want to access only a subset of its data.

In this tutorial, you use GL Draw to sketch a on the map, and then use ArcGIS REST JS to perform a spatial query against the LA County Parcels . The layer contains ±2.4 million features. The spatial query returns all of the parcels that intersect the sketched feature. A pop-up is also used to display feature attributes.

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 the correct privileges 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
    • Item access
      • Note: If you are using your own custom data layer for this tutorial, you need to grant the access to the layer item. Learn more in Item access privileges.
  2. Copy the API key access token to your clipboard when prompted.

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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        /* Use for API key authentication */
        const accessToken = "YOUR_ACCESS_TOKEN"
    
    Expand

Add script references

This tutorial uses three sets of libraries. ArcGIS REST JS is used for querying the feature layer. Mapbox GL Draw provides drawing tools, allowing the user to define a point, line, or polygon of interest. Terraformer is used to convert features generated by Mapbox GL Draw into ArcGIS JSON geometries; a requirement to query the feature layer service.

  1. Add <script> tags to reference the libraries.

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    <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@5.1.0/dist/maplibre-gl.js></script>
      <link href=https://unpkg.com/maplibre-gl@5.1.0/dist/maplibre-gl.css rel="stylesheet" />
    
      <link rel="stylesheet" href="https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-draw/v1.4.2/mapbox-gl-draw.css"
        type="text/css" />
      <script src="https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-draw/v1.4.2/mapbox-gl-draw.js"></script>
    
      <script src="https://unpkg.com/@esri/arcgis-rest-request@4/dist/bundled/request.umd.js"></script>
      <script
        src="https://unpkg.com/@esri/arcgis-rest-feature-service@4/dist/bundled/feature-service.umd.js"></script>
    
      <script src="https://unpkg.com/@terraformer/arcgis@2.1.2/dist/t-arcgis.umd.js"></script>
    
      <style>
        html,
        body,
        #map {
          padding: 0;
          margin: 0;
          height: 100%;
          width: 100%;
          font-family: Arial, Helvetica, sans-serif;
          font-size: 14px;
          color: #323232;
        }
      </style>
    </head>
    
    Expand

Add Mapbox GL Draw

To display the Mapbox GL Draw controls, create a MapboxDraw and call map.addControl. By default, other tools are included, so you need to specify the three required tools: point, line, and polygon.

  1. Create a MapboxDraw and add it to the Map.

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        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: [-118.80543, 34.03] // starting location [longitude, latitude]
    
        });
    
        const draw = new MapboxDraw({
          displayControlsDefault: false, // Don't add any tools other than those below
          controls: {
            point: true,
            line_string: true,
            polygon: true
          }
        });
        map.addControl(draw, "top-left");
    
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  2. Edit the MapboxDraw global constants to allow compatibility with MapLibre GL JS.

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        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: [-118.80543, 34.03] // starting location [longitude, latitude]
    
        });
    
        MapboxDraw.constants.classes.CONTROL_BASE = "maplibregl-ctrl";
        MapboxDraw.constants.classes.CONTROL_PREFIX = "maplibregl-ctrl-";
        MapboxDraw.constants.classes.CONTROL_GROUP = "maplibregl-ctrl-group";
    
        const draw = new MapboxDraw({
          displayControlsDefault: false, // Don't add any tools other than those below
          controls: {
            point: true,
            line_string: true,
            polygon: true
          }
        });
        map.addControl(draw, "top-left");
    
    Expand

Add query layers

Three are required to display the three types of query you can perform: circle, line, and fill. They share a single , which at any time will contain one feature of either Point, LineString or Polygon geometry. Create the source with an empty GeoJSON feature collection.

  1. Create an addQueryLayers function. Inside, add a and circle, line, and fill

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        function addQueryLayers() {
          map.addSource("query", {
            type: "geojson",
            data: {
              type: "FeatureCollection",
              features: []
            }
          });
          map.addLayer({
            id: "query-line",
            type: "line",
            source: "query",
            paint: {
              "line-color": "hsl(140, 0%, 30%)",
              "line-width": 2,
              "line-dasharray": [2, 2]
            }
          });
          map.addLayer({
            id: "query-fill",
            type: "fill",
            source: "query",
            paint: {
              "fill-color": "hsl(140, 0%, 50%)",
              "fill-opacity": 0.2
            },
            filter: ["==", ["geometry-type"], "Polygon"]
          });
    
          map.addLayer({
            id: "query-circle",
            type: "circle",
            source: "query",
            paint: {
              "circle-color": "hsl(140, 0%, 30%)"
            },
            filter: ["==", ["geometry-type"], "Point"]
          });
        }
    
    Expand

Add parcel layers

Parcels returned by the query are simple polygons. You can display them with a source and a fill .

  1. Create an addParcelLayers function. Inside, add a GeoJSON source and a fill layer.

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          map.addLayer({
            id: "query-circle",
            type: "circle",
            source: "query",
            paint: {
              "circle-color": "hsl(140, 0%, 30%)"
            },
            filter: ["==", ["geometry-type"], "Point"]
          });
        }
    
        function addParcelLayers() {
          map.addSource("parcels", {
            type: "geojson",
            data: {
              type: "FeatureCollection",
              features: []
            },
    
          });
          map.addLayer({
            id: "parcels-fill",
            source: "parcels",
            type: "fill",
    
            paint: {
              "fill-color": "hsl(200, 80%, 50%)",
              "fill-opacity": 0.5,
              "fill-outline-color": "white"
            }
          });
        }
    
    Expand
  2. Add the for the feature layer source.

    • Go to the LA County Parcels .
    • Scroll down to the Credits (Attribution) section and copy its value.
    • Create an attribution property and paste the attribution value from the item.
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          function addParcelLayers() {
            map.addSource("parcels", {
              type: "geojson",
              data: {
                type: "FeatureCollection",
                features: []
              },
      
              // Attribution text retrieved from https://arcgis-devlabs.maps.arcgis.com/home/item.html?id=a6fdf2ee0e454393a53ba32b9838b303
              attribution: "LA County Parcels"
      
            });
            map.addLayer({
              id: "parcels-fill",
              source: "parcels",
              type: "fill",
      
              paint: {
                "fill-color": "hsl(200, 80%, 50%)",
                "fill-opacity": 0.5,
                "fill-outline-color": "white"
              }
            });
          }
      
      Expand

Add a load handler

To add layers to the map, use the load event to ensure the map is fully loaded.

  1. Add an event handler for the load event. Inside, call addQueryLayers and addParcelLayers;

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            paint: {
              "fill-color": "hsl(200, 80%, 50%)",
              "fill-opacity": 0.5,
              "fill-outline-color": "white"
            }
          });
        }
    
        map.on("load", () => {
    
          addParcelLayers();
    
          addQueryLayers();
        });
    
    Expand

Get the draw feature

Mapbox GL Draw emits a draw.create event when you have finished drawing a feature. You can listen to this event to respond to the newly created feature.

By default, Mapbox GL Draw keeps all previously drawn features visible in its own . To prevent this, use deleteAll after copying the feature.

  1. Add an event handler for draw.create. Inside, store the feature in the query layer, then delete all features from Mapbox GL Draw.

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        map.on("load", () => {
    
          addParcelLayers();
    
          addQueryLayers();
        });
    
        map.on("draw.create", (e) => {
          const feature = e.features[0];
          map.getSource("query").setData(feature);
          draw.deleteAll();
    
        });
    
    Expand
  2. Click Run at the top right to test your code. You should be able to sketch a point, line or polygon feature, and see it turn into a green feature when complete.

Execute the query

Use the ArcGIS REST JS queryFeatures method to find features in the LA County Parcels that intersect the sketched feature. Use Terraformer.geojsonToArcGIS to convert the from Mapbox GL Draw into the ArcGIS geometry format.

When the matching parcels are returned, you can call setData on the parcels to display them.

  1. Create a function called executeQuery with geometry and geometryType parameters. Inside, create a new arcgisRest.ApiKeyManager to access the feature service. Call arcgisRest.queryFeatures. Pass the geometry and geometryType. Specify as the return type, requesting returnGeometry and specific outFields. All of the within the will be returned with information set by the outFields property.

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        map.on("draw.create", (e) => {
          const feature = e.features[0];
          map.getSource("query").setData(feature);
          draw.deleteAll();
    
        });
    
        function executeQuery(geometry, geometryType) {
    
          arcgisRest
            .queryFeatures({
              url: "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/LA_County_Parcels/FeatureServer/0",
              geometry: geometry,
              geometryType: geometryType,
              spatialRel: "esriSpatialRelIntersects",
              f: "geojson",
              returnGeometry: true,
              outFields: ["APN", "UseType", "TaxRateCity", " Roll_LandValue"]
            })
    
        }
    
    Expand
  2. Add a response handler. Inside, set the returned parcels as the data for the parcels source.

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          arcgisRest
            .queryFeatures({
              url: "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/LA_County_Parcels/FeatureServer/0",
              geometry: geometry,
              geometryType: geometryType,
              spatialRel: "esriSpatialRelIntersects",
              f: "geojson",
              returnGeometry: true,
              outFields: ["APN", "UseType", "TaxRateCity", " Roll_LandValue"]
            })
    
            .then((response) => {
              map.getSource("parcels").setData(response);
            });
    
        }
    
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  3. In your MapboxDraw event handler, call executeQuery. Use Terraformer.geojsonToArcGIS to convert geometry into an ArcGIS JSON format.

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        map.on("draw.create", (e) => {
          const feature = e.features[0];
          map.getSource("query").setData(feature);
          draw.deleteAll();
    
          const geometry = Terraformer.geojsonToArcGIS(feature.geometry);
          let geometryType = "esriGeometry" + feature.geometry.type;
          if (feature.geometry.type === "LineString") {
            geometryType = "esriGeometryPolyline";
          }
          executeQuery(geometry, geometryType);
    
        });
    
    Expand
  4. At the top right, click Run. When you create a feature using the toolbox, a spatial query will run against the and display all land parcels within the boundary of the feature.

Add a pop-up

You can add a pop-up to view attributes of a parcel when you click on it.

  1. Add a click event handler to the parcels-fill layer. Inside, construct the pop-up content from the attributes of the clicked parcel.

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            .then((response) => {
              map.getSource("parcels").setData(response);
            });
    
        }
    
        map.on("click", "parcels-fill", (e) => {
          const p = e.features[0].properties;
          const message =
            `<b>Parcel ${p.APN}</b>` +
            `Type: ${p.UseType} <br>` +
            `Land value: $${p.Roll_LandValue.toLocaleString()} <br>` +
            `Tax Rate City: ${p.TaxRateCity}`;
    
        });
    
    Expand
  2. Create a Popup. Use Popup.setHTML to set the content. Update the position of the pop-up using Popup.setLngLat, and add it to the map using Popup.addTo.

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        map.on("click", "parcels-fill", (e) => {
          const p = e.features[0].properties;
          const message =
            `<b>Parcel ${p.APN}</b>` +
            `Type: ${p.UseType} <br>` +
            `Land value: $${p.Roll_LandValue.toLocaleString()} <br>` +
            `Tax Rate City: ${p.TaxRateCity}`;
    
          new maplibregl.Popup().setHTML(message).setLngLat(e.lngLat).addTo(map);
    
        });
    
    Expand

Run the app

Run the app.

When you click on the map to draw a , a spatial query will run against the and display all land parcels that intersect the boundary of the . You can click on a parcel to see a pop-up with information about the parcel, or click somewhere else to reset the map.

What's next?

Learn how to use additional ArcGIS location services in these tutorials:

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