Add a feature layer

Before starting this tutorial:

1. You need an ArcGIS Location Platform or ArcGIS Online account.

2. Your system meets the system requirements.

3. The ArcGIS Maps SDK for Qt, version 200.8.0 or later is installed.

4. The Qt 6.8.2 software development framework or later is installed.

Option 1: Develop the code

To start the tutorial, complete the Display a map tutorial. This creates a map to display the Santa Monica Mountains in California using the topographic basemap from the ArcGIS Basemap Styles service.

Open a Qt Creator project

1. Open the project you created by completing the Display a map tutorial.
2. Continue with the following instructions to use a URL to access and display a feature layer in a map.

Include header files

1. In the project Headers folder of Qt Creator, double-click the Display_a_map.cpp file to open it. Include these header files to be able to create ServiceFeatureTable and FeatureLayer instances.

   Display-a-map.cpp

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   #include "Display_a_map.h"
   #include "Map.h"
   
   #include "MapTypes.h"
   
   #include "MapQuickView.h"
   
   #include "Point.h"
   #include "Viewpoint.h"
   #include "SpatialReference.h"
   #include <QFuture>
   
   #include "LayerListModel.h"
   #include "ServiceFeatureTable.h"
   #include "FeatureLayer.h"
   

Add a polygon feature layer

This tutorial will draw the map in following order:

1. ArcGISTopographic basemap style layer
2. Parks and Open Spaces (polygons)
3. Trails (lines)
4. Trailheads (points)

It is important to add feature layers in the correct order so features are displayed correctly. Polygon feature layers are typically created before lines or points, so that those features are not obscured by the polygons.

Use the FeatureLayer class to reference the Parks and Open Spaces URL and add features to the map.

1. Go to the Parks and Open Spaces URL and browse the properties of the layer. You may want to explore the Name, Type, Drawing Info, and Fields properties.

2. Within the setupViewpoint() method, add the following code. Create a QUrl instance named polygonFeatureUrl using an ArcGIS feature server as the feature data source. Then create a ServiceFeatureTable named polygon_feature_table from that QUrl.

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   void Display_a_map::setupViewpoint()
   {
   
     const Point center(-118.80543, 34.02700, SpatialReference::wgs84());
     const Viewpoint viewpoint(center, 100000.0);
     m_mapView->setViewpointAsync(viewpoint);
   
     const QUrl polygonFeatureUrl("https://services3.arcgis.com/GVgbJbqm8hXASVYi/ArcGIS/rest/services/Parks_and_Open_Space/FeatureServer/0");
     ServiceFeatureTable* polygon_feature_table = new ServiceFeatureTable(polygonFeatureUrl, this);
   
   }
   

3. Continuing within the setupViewpoint() method, you will create a FeatureLayer instance named polygon_feature_layer, passing in polygon_feature_table as the argument. Then append your new polygon_feature_layer to the Map instance named m_map.

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   void Display_a_map::setupViewpoint()
   {
   
     const Point center(-118.80543, 34.02700, SpatialReference::wgs84());
     const Viewpoint viewpoint(center, 100000.0);
     m_mapView->setViewpointAsync(viewpoint);
   
     const QUrl polygonFeatureUrl("https://services3.arcgis.com/GVgbJbqm8hXASVYi/ArcGIS/rest/services/Parks_and_Open_Space/FeatureServer/0");
     ServiceFeatureTable* polygon_feature_table = new ServiceFeatureTable(polygonFeatureUrl, this);
   
     FeatureLayer* polygon_feature_layer = new FeatureLayer(polygon_feature_table, this);
     m_map->operationalLayers()->append(polygon_feature_layer);
   
   }
   

Add a line feature layer

Line features are typically displayed in a feature layer before points. Use the FeatureLayer class to reference the Trails URL and add features to the map, as described next.

1. Staying within the setupViewpoint() method, add the following code to create a QUrl instance named lineFeatureUrl using the ArcGIS feature server as the feature data source, in this case, Trails_Styled. Then create a ServiceFeatureTable named line_feature_table from that QUrl.

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   void Display_a_map::setupViewpoint()
   {
   
     const Point center(-118.80543, 34.02700, SpatialReference::wgs84());
     const Viewpoint viewpoint(center, 100000.0);
     m_mapView->setViewpointAsync(viewpoint);
   
     const QUrl polygonFeatureUrl("https://services3.arcgis.com/GVgbJbqm8hXASVYi/ArcGIS/rest/services/Parks_and_Open_Space/FeatureServer/0");
     ServiceFeatureTable* polygon_feature_table = new ServiceFeatureTable(polygonFeatureUrl, this);
   
     FeatureLayer* polygon_feature_layer = new FeatureLayer(polygon_feature_table, this);
     m_map->operationalLayers()->append(polygon_feature_layer);
   
     const QUrl lineFeatureUrl("https://services3.arcgis.com/GVgbJbqm8hXASVYi/ArcGIS/rest/services/Trails/FeatureServer/0");
     ServiceFeatureTable* line_feature_table = new ServiceFeatureTable(lineFeatureUrl, this);
   
   }
   

2. Continuing within the setupViewpoint() method, create a FeatureLayer instance named line_feature_layer, passing in line_feature_table as the argument. Then append your new line_feature_layer to the Map instance named m_map.

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   void Display_a_map::setupViewpoint()
   {
   
     const Point center(-118.80543, 34.02700, SpatialReference::wgs84());
     const Viewpoint viewpoint(center, 100000.0);
     m_mapView->setViewpointAsync(viewpoint);
   
     const QUrl polygonFeatureUrl("https://services3.arcgis.com/GVgbJbqm8hXASVYi/ArcGIS/rest/services/Parks_and_Open_Space/FeatureServer/0");
     ServiceFeatureTable* polygon_feature_table = new ServiceFeatureTable(polygonFeatureUrl, this);
   
     FeatureLayer* polygon_feature_layer = new FeatureLayer(polygon_feature_table, this);
     m_map->operationalLayers()->append(polygon_feature_layer);
   
     const QUrl lineFeatureUrl("https://services3.arcgis.com/GVgbJbqm8hXASVYi/ArcGIS/rest/services/Trails/FeatureServer/0");
     ServiceFeatureTable* line_feature_table = new ServiceFeatureTable(lineFeatureUrl, this);
   
     FeatureLayer* line_feature_layer = new FeatureLayer(line_feature_table, this);
     m_map->operationalLayers()->append(line_feature_layer);
   
   }
   

Add a point feature layer

1. Staying within the setupViewpoint() method, add the following code to create a QUrl instance named pointFeatureUrl using the ArcGIS feature server as the feature data source, in this case, Trailheads. Then create a ServiceFeatureTable named point_feature_table from that QUrl.

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   void Display_a_map::setupViewpoint()
   {
   
     const Point center(-118.80543, 34.02700, SpatialReference::wgs84());
     const Viewpoint viewpoint(center, 100000.0);
     m_mapView->setViewpointAsync(viewpoint);
   
     const QUrl polygonFeatureUrl("https://services3.arcgis.com/GVgbJbqm8hXASVYi/ArcGIS/rest/services/Parks_and_Open_Space/FeatureServer/0");
     ServiceFeatureTable* polygon_feature_table = new ServiceFeatureTable(polygonFeatureUrl, this);
   
     FeatureLayer* polygon_feature_layer = new FeatureLayer(polygon_feature_table, this);
     m_map->operationalLayers()->append(polygon_feature_layer);
   
     const QUrl lineFeatureUrl("https://services3.arcgis.com/GVgbJbqm8hXASVYi/ArcGIS/rest/services/Trails/FeatureServer/0");
     ServiceFeatureTable* line_feature_table = new ServiceFeatureTable(lineFeatureUrl, this);
   
     FeatureLayer* line_feature_layer = new FeatureLayer(line_feature_table, this);
     m_map->operationalLayers()->append(line_feature_layer);
   
     const QUrl pointFeatureUrl("https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads/FeatureServer/0");
     ServiceFeatureTable* point_feature_table= new ServiceFeatureTable(pointFeatureUrl, this);
   
   }
   

2. Continuing within the setupViewpoint() method, add the following two lines of code to create a FeatureLayer, passing in point_feature_table as the argument. Then append your FeatureLayer to the Map instance named m_map.

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   void Display_a_map::setupViewpoint()
   {
   
     const Point center(-118.80543, 34.02700, SpatialReference::wgs84());
     const Viewpoint viewpoint(center, 100000.0);
     m_mapView->setViewpointAsync(viewpoint);
   
     const QUrl polygonFeatureUrl("https://services3.arcgis.com/GVgbJbqm8hXASVYi/ArcGIS/rest/services/Parks_and_Open_Space/FeatureServer/0");
     ServiceFeatureTable* polygon_feature_table = new ServiceFeatureTable(polygonFeatureUrl, this);
   
     FeatureLayer* polygon_feature_layer = new FeatureLayer(polygon_feature_table, this);
     m_map->operationalLayers()->append(polygon_feature_layer);
   
     const QUrl lineFeatureUrl("https://services3.arcgis.com/GVgbJbqm8hXASVYi/ArcGIS/rest/services/Trails/FeatureServer/0");
     ServiceFeatureTable* line_feature_table = new ServiceFeatureTable(lineFeatureUrl, this);
   
     FeatureLayer* line_feature_layer = new FeatureLayer(line_feature_table, this);
     m_map->operationalLayers()->append(line_feature_layer);
   
     const QUrl pointFeatureUrl("https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads/FeatureServer/0");
     ServiceFeatureTable* point_feature_table= new ServiceFeatureTable(pointFeatureUrl, this);
   
     FeatureLayer* point_feature_layer = new FeatureLayer(point_feature_table, this);
     m_map->operationalLayers()->append(point_feature_layer);
   
   }
   

Set developer credentials

Now to complete this tutorial, click on the switcher for either API key authentication or User authentication options to use the correct authentication pattern to run the application.

You will need to supply the correct information for the authentication pattern you choose, this information was obtained when completing the Display a map tutorial.

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ARCGIS_RUNTIME_VERSION = 200.8.0
include($$PWD/arcgisruntime.pri)

# TODO: You need to replace the <path_to_toolkit_repo> with a valid location where the Qt Toolkit
# resides on your system, example: C:/arcgis-maps-sdk-toolkit-qt/uitools/toolkitcpp/toolkitcpp.pri
# This block determines whether you've cloned your toolkit
PATH_TO_TOOLKIT = "<path_to_toolkit_repo>/uitools/toolkitcpp/toolkitcpp.pri"

exists($${PATH_TO_TOOLKIT}) {
  message("Toolkit found")
  DEFINES += TOOLKIT_FOUND

  # include the toolkitcpp.pri, which contains all the toolkit resources
  include($${PATH_TO_TOOLKIT})

  qtHaveModule(webenginequick) {
    QT += webenginequick
  }
} else {
  message("Toolkit not found in provided path. Either set PATH_TO_TOOLKIT or use an API Key")
}

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{

#ifdef TOOLKIT_FOUND

    // Define the Redirect URL string obtained when creating the OAuth credentials.
    // TODO: You need to replace the "REDIRECT_URL" with your own valid string,
    // ex: "urn:ietf:wg:oauth:2.0:oob"
    const auto qStringRedirectUrl = QString{"REDIRECT_URL"};

    // Define the URL of the portal to authenticate with.
    const QUrl qUrlPortal = QUrl{"https://www.arcgis.com/"};

    // Define a unique identifier associated with an application registered with the
    // portal that assists with client/server OAuth authentication.
    // TODO: You need to replace the "CLIENT_ID" with your own valid string.
    const QString qStringClientId = QString{"CLIENT_ID"};

    // Create a new OAuth user configuration using: the Url to mapping web service, the Client ID
    // string, and the Redirect Url string.
    auto* oAuthUserConfiguration = new OAuthUserConfiguration(qUrlPortal, qStringClientId,
                                                              qStringRedirectUrl, this);

    // Call the Toolkit's OAuthUserConfigurationManager static `addConfiguration`
    // method to use the OAuth dialog. This will tell the Authenticator to use OAuth for the provided configuration.
    Toolkit::OAuthUserConfigurationManager::addConfiguration(oAuthUserConfiguration);
#endif // TOOLKIT_FOUND

Press Ctrl + R to run the app.

The map view should display all three feature layers in the map. Double-click, drag, and scroll the mouse wheel over the map view to explore the map.

Option 2: Download the solution

1. Click the Download solution link under Solution and unzip the file to a location on your machine.

2. Open the .pro project file in Qt Creator.

Since the downloaded solution does not contain authentication credentials, you must set up authentication to create the developer credentials and add them to the project.

Now to complete this tutorial, click on the switcher for either API key authentication or User authentication options to use the correct authentication pattern to run the application.

You will need to supply the correct information for the authentication pattern you choose, this information was obtained when completing the Display a map tutorial.

Set developer credentials in the solution

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ARCGIS_RUNTIME_VERSION = 200.8.0
include($$PWD/arcgisruntime.pri)

# TODO: You need to replace the <path_to_toolkit_repo> with a valid location where the Qt Toolkit
# resides on your system, example: C:/arcgis-maps-sdk-toolkit-qt/uitools/toolkitcpp/toolkitcpp.pri
# This block determines whether you've cloned your toolkit
PATH_TO_TOOLKIT = "<path_to_toolkit_repo>/uitools/toolkitcpp/toolkitcpp.pri"

exists($${PATH_TO_TOOLKIT}) {
  message("Toolkit found")
  DEFINES += TOOLKIT_FOUND

  # include the toolkitcpp.pri, which contains all the toolkit resources
  include($${PATH_TO_TOOLKIT})

  qtHaveModule(webenginequick) {
    QT += webenginequick
  }
} else {
  message("Toolkit not found in provided path. Either set PATH_TO_TOOLKIT or use an API Key")
}

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{

#ifdef TOOLKIT_FOUND

    // Define the Redirect URL string obtained when creating the OAuth credentials.
    // TODO: You need to replace the "REDIRECT_URL" with your own valid string,
    // ex: "urn:ietf:wg:oauth:2.0:oob"
    const auto qStringRedirectUrl = QString{"REDIRECT_URL"};

    // Define the URL of the portal to authenticate with.
    const QUrl qUrlPortal = QUrl{"https://www.arcgis.com/"};

    // Define a unique identifier associated with an application registered with the
    // portal that assists with client/server OAuth authentication.
    // TODO: You need to replace the "CLIENT_ID" with your own valid string.
    const QString qStringClientId = QString{"CLIENT_ID"};

    // Create a new OAuth user configuration using: the Url to mapping web service, the Client ID
    // string, and the Redirect Url string.
    auto* oAuthUserConfiguration = new OAuthUserConfiguration(qUrlPortal, qStringClientId,
                                                              qStringRedirectUrl, this);

    // Call the Toolkit's OAuthUserConfigurationManager static `addConfiguration`
    // method to use the OAuth dialog. This will tell the Authenticator to use OAuth for the provided configuration.
    Toolkit::OAuthUserConfigurationManager::addConfiguration(oAuthUserConfiguration);
#endif // TOOLKIT_FOUND

Run the solution

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The map view should display all three feature layers in the map. Double-click, drag, and scroll the mouse wheel over the map view to explore the map.