Feature layers, like all layers, are visual representations of data and are used on a map or scene. In the case of feature layers, the underlying data is held in a feature table or feature service.
Feature services are useful for sharing vector GIS data with clients so that individual features can be queried, displayed, and edited. There are various online and offline methods to load feature services.
How to use the sample
Use the drop down to display different feature layers on the map. Pan and zoom the map to view the feature layers.
How it works
Set the basemap with a BasemapStyle enum
Create a feature layer with a Geodatabase
Instantiate a Geodatabase using the file name
Get a GeodatabaseFeatureTable by name from the geodatabase
Create a new FeatureLayer from the feature table
Create a feature layer with a GeoPackage
Instantiate a GeoPackage using the file name and load it
Get the first GeoPackageFeatureTable from the geopackage's feature tables list
Create a new FeatureLayer from the feature table
Create a feature layer with a PortalItem
Instantiate a PortalItem with a Portal and an item ID
Create a FeatureLayer with the portal item and layer ID
Create a feature layer with a ServiceFeatureTable
Create a ServiceFeatureTable with a URL
Create a FeatureLayer with the feature table
Create a feature layer with a shapefile
Create a ShapefileFeatureTable using the shapefile name
Create a feature layer from the feature table and load it
Add the created feature layer to the Map's operationalLayers
Relevant API
FeatureLayer
Geodatabase
GeoPackage
PortalItem
ServiceFeatureTable
ShapefileFeatureTable
Offline data
Read more about how to set up the sample's offline data here.
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// [WriteFile Name=DisplayFeatureLayers, Category=Layers]// [Legal]// Copyright 2022 Esri.// Licensed under the Apache License, Version 2.0 (the "License");// you may not use this file except in compliance with the License.// You may obtain a copy of the License at// http://www.apache.org/licenses/LICENSE-2.0// Unless required by applicable law or agreed to in writing, software// distributed under the License is distributed on an "AS IS" BASIS,// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.// See the License for the specific language governing permissions and// limitations under the License.// [Legal]#ifdef PCH_BUILD#include"pch.hpp"#endif// PCH_BUILD#include"DisplayFeatureLayers.h"#include"Envelope.h"#include"Error.h"#include"FeatureLayer.h"#include"Geodatabase.h"#include"GeodatabaseFeatureTable.h"#include"GeoPackage.h"#include"GeoPackageFeatureTable.h"#include"LayerListModel.h"#include"Map.h"#include"MapQuickView.h"#include"MapTypes.h"#include"Point.h"#include"Portal.h"#include"PortalItem.h"#include"TaskWatcher.h"#include"ServiceFeatureTable.h"#include"ShapefileFeatureTable.h"#include"SpatialReference.h"#include"Viewpoint.h"#include<QStandardPaths>usingnamespace Esri::ArcGISRuntime;
// helper method to get cross platform data pathnamespace{
QString defaultDataPath(){
QString dataPath;
#ifdef Q_OS_IOS dataPath = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);
#else dataPath = QStandardPaths::writableLocation(QStandardPaths::HomeLocation);
#endifreturn dataPath + "/ArcGIS/Runtime/Data/";
}
} // namespaceDisplayFeatureLayers::DisplayFeatureLayers(QObject* parent /* = nullptr */):
QObject(parent),
m_map(newMap(BasemapStyle::ArcGISTopographic, this))
{
// Each of these methods creates and adds a feature layer of the specified type to the map's operationalLayers LayerListModeladdGeodatabaseLayer();
addGeopackageLayer();
addPortalItemLayer();
addServiceFeatureTableLayer();
addShapefileLayer();
}
DisplayFeatureLayers::~DisplayFeatureLayers() = default;
voidDisplayFeatureLayers::init(){
// Register the map view for QML qmlRegisterType<MapQuickView>("Esri.Samples", 1, 0, "MapView");
qmlRegisterType<DisplayFeatureLayers>("Esri.Samples", 1, 0, "DisplayFeatureLayersSample");
}
MapQuickView* DisplayFeatureLayers::mapView()const{
return m_mapView;
}
// Set the view (created in QML)voidDisplayFeatureLayers::setMapView(MapQuickView* mapView){
if (!mapView || mapView == m_mapView)
return;
m_mapView = mapView;
m_mapView->setMap(m_map);
emit mapViewChanged();
}
voidDisplayFeatureLayers::setLayerVisibility(FeatureLayerType featureLayerType){
if (!m_map || !m_mapView)
return;
// Hide all other layersfor (Layer* layer : *m_map->operationalLayers())
{
layer->setVisible(false);
}
// Make the selected feature layer visible and set the viewpoint to show the layerswitch (featureLayerType) {
case FeatureLayerType::Geodatabase:
m_gdbFeatureLayer->setVisible(true);
m_mapView->setViewpointGeometry(m_gdbFeatureLayer->fullExtent());
break;
case FeatureLayerType::Geopackage:
m_gpkgFeatureLayer->setVisible(true);
m_mapView->setViewpointGeometry(m_gpkgFeatureLayer->fullExtent());
break;
case FeatureLayerType::PortalItem:
m_portalItemFeatureLayer->setVisible(true);
// We can set padding on the viewpoint geometry. A negative value will zoom in. m_mapView->setViewpointGeometry(m_portalItemFeatureLayer->fullExtent(), -10'000);
break;
case FeatureLayerType::ServiceFeatureTable:
m_serviceFeatureTableFeatureLayer->setVisible(true);
// The extent of this layer is very large so we can set the viewpoint to a specific point m_mapView->setViewpointAndWait(Viewpoint(Point(-13176752, 4090404, SpatialReference(102100)), 300'000));
break;
case FeatureLayerType::Shapefile:
m_shpFeatureLayer->setVisible(true);
m_mapView->setViewpointGeometry(m_shpFeatureLayer->fullExtent());
break;
default:
break;
}
}
voidDisplayFeatureLayers::addGeodatabaseLayer(){
Geodatabase* gdb = newGeodatabase(defaultDataPath() + "geodatabase/LA_Trails.geodatabase", this);
connect(gdb, &Geodatabase::doneLoading, this, [gdb, this](const Error& e)
{
if (!e.isEmpty())
{
qDebug() << e.message() << e.additionalMessage();
return;
}
GeodatabaseFeatureTable* gdbFeatureTable = gdb->geodatabaseFeatureTable("Trailheads");
m_gdbFeatureLayer = newFeatureLayer(gdbFeatureTable, this);
m_map->operationalLayers()->append(m_gdbFeatureLayer);
// Because this feature layer is added asynchronously, we may need to set its visibility even after the initial setLayerVisibility() method is called m_gdbFeatureLayer->setVisible(false);
});
gdb->load();
}
voidDisplayFeatureLayers::addGeopackageLayer(){
GeoPackage* gpkg = newGeoPackage(defaultDataPath() + "gpkg/AuroraCO.gpkg", this);
connect(gpkg, &GeoPackage::doneLoading, this, [this, gpkg](const Error& e)
{
if (!e.isEmpty())
{
qDebug() << e.message() << e.additionalMessage();
return;
}
if (!(gpkg->geoPackageFeatureTables().size() > 0))
return;
GeoPackageFeatureTable* gpkgFeatureTable = gpkg->geoPackageFeatureTables().at(0);
m_gpkgFeatureLayer = newFeatureLayer(gpkgFeatureTable, this);
m_map->operationalLayers()->append(m_gpkgFeatureLayer);
// Because this feature layer is added asynchronously, we may need to set its visibility even after the initial setLayerVisibility() method is called m_gpkgFeatureLayer->setVisible(false);
});
gpkg->load();
// Note that you must call close() on GeoPackage to allow other processes to access it}
voidDisplayFeatureLayers::addPortalItemLayer(){
Portal* portal = newPortal(this);
PortalItem* portalItem = newPortalItem(portal, "1759fd3e8a324358a0c58d9a687a8578", this);
// A portal item can be many things from files to web maps.// We can check its type to ensure we're instantiating a feature layer with the// correct portal item type, but the portal item must first be loaded explicitly.// Here, the portal item is automatically loaded when it is used to instantiate a feature layer. m_portalItemFeatureLayer = newFeatureLayer(portalItem, 0, this);
m_map->operationalLayers()->append(m_portalItemFeatureLayer);
}
voidDisplayFeatureLayers::addServiceFeatureTableLayer(){
ServiceFeatureTable* serviceFeatureTable = newServiceFeatureTable(QUrl("https://sampleserver6.arcgisonline.com/arcgis/rest/services/Energy/Geology/FeatureServer/9"), this);
m_serviceFeatureTableFeatureLayer = newFeatureLayer(serviceFeatureTable, this);
m_map->operationalLayers()->append(m_serviceFeatureTableFeatureLayer);
}
voidDisplayFeatureLayers::addShapefileLayer(){
ShapefileFeatureTable* shpFeatureTable = newShapefileFeatureTable(defaultDataPath() + "shp/ScottishWildlifeTrust_ReserveBoundaries_20201102.shp", this);
m_shpFeatureLayer = newFeatureLayer(shpFeatureTable, this);
m_map->operationalLayers()->append(m_shpFeatureLayer);
}