Create a Feature Collection Layer from a Feature Collection Table, and add it to a map.
Use case
A Feature Collection allows easily importing external data (such as CSV files), as well as creating custom schema for data that is in non-standardized format. This data can then be used to populate a Feature Collection Table, and displayed in a Feature Collection Layer using the attributes and geometries provided in the external data source. For example, an electricity supplier could use this functionality to visualize existing location data of coverage areas (polygons), power stations (points), transmission lines (polylines), and others.
How to use the sample
When launched, this sample displays a FeatureCollectionLayer with a Point, Polyline and Polygon geometry. Pan and zoom to explore the scene.
How it works
A FeatureCollectionLayer is created from a FeatureCollection and is added to the map's operational layers. Then, a point FeatureCollectionTable, a polyline FeatureCollectionTable, and a polygon FeatureCollectionTable are created, and their schemas and renderers are defined. Next, features are added to each table, and each table is added to the FeatureCollection. In this case, hardcoded features are added to the tables for display on the map. However, a common use case is to read a CSV or some other data source, and to popuplate the table with the attributes and geometry provided in the external data source.
Create a FeatureCollectionLayer using a new feature collection,.
Add the feature collection layer to the Map.
Create a FeatureCollectionTable for the GeometryTypes Point, Polyline, and Polygon, FeatureCollectionTable(fields, geometryType, spatialRefernce)
Additionally, pass in a list of Field objects to represent the table's schema. In this case a field of type String named name is added.
Assign a SimpleRenderer to each table to render any Features from that table using the Symbol that was set.
Add the feature collection table to the feature collection, FeatureCollection.tables.addFeature(featureCollectionTable).
Use the createFeature method to create a feature from the feature collection table, passing an attribute and geometry for that feature, FeatureCollectionTable.createFeature(attributes, geometry).
Add new features to the table, FeatureCollectionTable.addFeature(feature).
Relevant API
Feature
FeatureCollection
FeatureCollectionLayer
FeatureCollectionTable
Field
SimpleRenderer
Tags
collection, feature, layers, table
Sample Code
Feature_Collection_Layer.qml
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// [WriteFile Name=Feature_Collection_Layer, Category=Layers]// [Legal]// Copyright 2016 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]import QtQuick
import Esri.ArcGISRuntime
Rectangle {
id: rootRectangleclip: truewidth: 800height: 600MapView {
id: mapViewanchors.fill: parentComponent.onCompleted: {
// Set the focus on MapView to initially enable keyboard navigation forceActiveFocus();
}
Map {
Basemap {
initStyle: Enums.BasemapStyleArcGISOceans
}
// Declare a FeatureCollectionLayerFeatureCollectionLayer {
// Create a FeatureCollection inside theFeatureCollection {
// Create a Point FeatureCollectionTable inside the FeatureCollectionFeatureCollectionTable {
id: pointsTable// define the schema of the tablegeometryType: Enums.GeometryTypePoint
spatialReference: SpatialReference { wkid: 4326 }
Field {
id: placeFieldalias: "Place Name"name: "Place"length: 50fieldType: Enums.FieldTypeText
}
// define the rendererSimpleRenderer {
SimpleMarkerSymbol {
style: Enums.SimpleMarkerSymbolStyleTriangle
color: "red"size: 18 }
}
Component.onCompleted: {
// Create a new point feature, provide geometry and attribute valuesconst pointFeature = pointsTable.createFeature();
pointFeature.attributes.replaceAttribute("Place", "Current location");
const point1 = ArcGISRuntimeEnvironment.createObject("Point", {x: -79.497238, y: 8.849289, spatialReference: Factory.SpatialReference.createWgs84()});
pointFeature.geometry = point1;
// Add to the table pointsTable.addFeature(pointFeature);
}
}
// Create a Point FeatureCollectionTable inside the FeatureCollectionFeatureCollectionTable {
id: linesTable// define the schema of the tablegeometryType: Enums.GeometryTypePolyline
spatialReference: SpatialReference { wkid: 4326 }
Field {
alias: "Boundary Name"name: "Boundary"length: 50fieldType: Enums.FieldTypeText
}
// define the rendererSimpleRenderer {
SimpleLineSymbol {
style: Enums.SimpleLineSymbolStyleDash
color: "green"width: 3 }
}
Component.onCompleted: {
// Create a new polyline feature, provide geometry and attribute valuesconst lineFeature = linesTable.createFeature();
lineFeature.attributes.replaceAttribute("Boundary", "AManAPlanACanalPanama");
const point1 = ArcGISRuntimeEnvironment.createObject("Point", {x: -79.497238, y: 8.849289, spatialReference: Factory.SpatialReference.createWgs84()});
const point2 = ArcGISRuntimeEnvironment.createObject("Point", {x: -80.035568, y: 9.432302, spatialReference: Factory.SpatialReference.createWgs84()});
const lineBuilder = ArcGISRuntimeEnvironment.createObject("PolylineBuilder", {spatialReference: Factory.SpatialReference.createWgs84()});
lineBuilder.addPoint(point1);
lineBuilder.addPoint(point2);
lineFeature.geometry = lineBuilder.geometry;
// Add to the table linesTable.addFeature(lineFeature);
}
}
// Create a Point FeatureCollectionTable inside the FeatureCollectionFeatureCollectionTable {
id: polygonTable// define the schema of the tablegeometryType: Enums.GeometryTypePolygon
spatialReference: SpatialReference { wkid: 4326 }
Field {
alias: "Area Name"name: "Area"length: 50fieldType: Enums.FieldTypeText
}
// define the rendererSimpleRenderer {
// fillSimpleFillSymbol {
style: Enums.SimpleFillSymbolStyleDiagonalCross
color: "cyan"// outlineSimpleLineSymbol {
style: Enums.SimpleLineSymbolStyleSolid
color: "blue"width: 2 }
}
}
Component.onCompleted: {
// Create a new point feature, provide geometry and attribute valuesconst polygonFeature = linesTable.createFeature();
polygonFeature.attributes.replaceAttribute("Area", "Restricted area");
const point1 = ArcGISRuntimeEnvironment.createObject("Point", {x: -79.497238, y: 8.849289, spatialReference: Factory.SpatialReference.createWgs84()});
const point2 = ArcGISRuntimeEnvironment.createObject("Point", {x: -79.337936, y: 8.638903, spatialReference: Factory.SpatialReference.createWgs84()});
const point3 = ArcGISRuntimeEnvironment.createObject("Point", {x: -79.11409, y: 8.895422, spatialReference: Factory.SpatialReference.createWgs84()});
const polygonBuilder = ArcGISRuntimeEnvironment.createObject("PolygonBuilder", {spatialReference: Factory.SpatialReference.createWgs84()});
polygonBuilder.addPoint(point1);
polygonBuilder.addPoint(point2);
polygonBuilder.addPoint(point3);
polygonFeature.geometry = polygonBuilder.geometry;
// Add to the table polygonTable.addFeature(polygonFeature);
}
}
}
}
// set initial extentViewpointExtent {
Envelope {
xMax: -8800611.655131537xMin: -8917856.590171767yMax: 1100327.8941287803yMin: 903277.583136797spatialReference: SpatialReference { wkid: 3857 }
}
}
}
}
}
