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Feature collection layer

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Create a feature collection layer from a feature collection table, and add it to a map.

Image of feature collection layer

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

  1. Create a FeatureCollectionLayer using a new feature collection, FeatureCollectionLayer(featureCollection)
  2. Add the feature collection layer to the map, ArcGISMap.getOperationalLayers().add(featureCollectionLayer).
  3. 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.
  4. Assign a SimpleRenderer to each table to render any Features from that table using the Symbol that was set.
  5. Add the feature collection table to the feature collection, FeatureCollection.getTables().add(featureCollectionTable).
  6. 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).
  7. Add new features to the table, FeatureCollectionTable.addFeatureAsync(feature).

Relevant API

  • ArcGISFeature
  • FeatureCollection
  • FeatureCollectionLayer
  • FeatureCollectionTable
  • Field
  • SimpleRenderer

Tags

collection, feature, layers, table

Sample Code

FeatureCollectionLayerSample.java
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 /*  * 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.  */  package com.esri.samples.feature_collection_layer;  import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map;  import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.layout.StackPane; import javafx.scene.paint.Color; import javafx.stage.Stage;  import com.esri.arcgisruntime.ArcGISRuntimeEnvironment; import com.esri.arcgisruntime.data.Feature; import com.esri.arcgisruntime.data.FeatureCollection; import com.esri.arcgisruntime.data.FeatureCollectionTable; import com.esri.arcgisruntime.data.Field; import com.esri.arcgisruntime.geometry.GeometryType; import com.esri.arcgisruntime.geometry.Point; import com.esri.arcgisruntime.geometry.PolygonBuilder; import com.esri.arcgisruntime.geometry.PolylineBuilder; import com.esri.arcgisruntime.geometry.SpatialReference; import com.esri.arcgisruntime.geometry.SpatialReferences; import com.esri.arcgisruntime.layers.FeatureCollectionLayer; import com.esri.arcgisruntime.mapping.ArcGISMap; import com.esri.arcgisruntime.mapping.BasemapStyle; import com.esri.arcgisruntime.mapping.view.MapView; import com.esri.arcgisruntime.symbology.SimpleFillSymbol; import com.esri.arcgisruntime.symbology.SimpleLineSymbol; import com.esri.arcgisruntime.symbology.SimpleMarkerSymbol; import com.esri.arcgisruntime.symbology.SimpleMarkerSymbol.Style; import com.esri.arcgisruntime.symbology.SimpleRenderer;  public class FeatureCollectionLayerSample extends Application {   private MapView mapView;   private static final SpatialReference WGS84 = SpatialReferences.getWgs84();   @Override  public void start(Stage stage) {   try {  // create stack pane and application scene  StackPane stackPane = new StackPane();  Scene scene = new Scene(stackPane);   // set title, size, and add scene to stage  stage.setTitle("Feature Collection Layer Sample");  stage.setWidth(800);  stage.setHeight(700);  stage.setScene(scene);  stage.show();   // authentication with an API key or named user is required to access basemaps and other location services  String yourAPIKey = System.getProperty("apiKey");  ArcGISRuntimeEnvironment.setApiKey(yourAPIKey);   // create a map with the oceans basemap style  ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_OCEANS);   // create a map view and set the map to it  mapView = new MapView();  mapView.setMap(map);   // set initial location for view  mapView.setViewpointCenterAsync(new Point(-79.497238, 8.849289, WGS84), 1000000);   // create feature collection and add to the map as a layer  FeatureCollection featureCollection = new FeatureCollection();  FeatureCollectionLayer featureCollectionLayer = new FeatureCollectionLayer(featureCollection);  map.getOperationalLayers().add(featureCollectionLayer);   // add point, line, and polygon geometry to feature collection  createPointTable(featureCollection);  createPolylineTable(featureCollection);  createPolygonTables(featureCollection);   // add the map view to stack pane  stackPane.getChildren().addAll(mapView);  } catch (Exception e) {  // on any error, display the stack trace.  e.printStackTrace();  }  }   /**  * Creates a Point Feature Collection Table with one Point and adds it to the Feature collection that was passed.  *  * @param featureCollection that the point Feature Collection Table will be added to  */  private void createPointTable(FeatureCollection featureCollection) {   // defines the schema for the geometry's attribute  List<Field> pointFields = new ArrayList<>();  pointFields.add(Field.createString("Place", "Place Name", 50));   // a feature collection table that creates point geometry  FeatureCollectionTable pointsTable = new FeatureCollectionTable(pointFields, GeometryType.POINT, WGS84);   // set a default symbol for features in the collection table  SimpleMarkerSymbol markerSymbol = new SimpleMarkerSymbol(Style.TRIANGLE, Color.RED, 18);  SimpleRenderer renderer = new SimpleRenderer(markerSymbol);  pointsTable.setRenderer(renderer);   // add feature collection table to feature collection  featureCollection.getTables().add(pointsTable);   // create feature using the collection table by passing an attribute and geometry  Map<String, Object> attributes = new HashMap<>();  attributes.put(pointFields.get(0).getName(), "Current Location");  Point point = new Point(-79.497238, 8.849289, WGS84);  Feature addedFeature = pointsTable.createFeature(attributes, point);   // add feature to collection table  pointsTable.addFeatureAsync(addedFeature);  }   /**  * Creates a PolyLine Feature Collection Table with one PolyLine and adds it to the Feature collection that was passed.  *  * @param featureCollection that the polyline Feature Collection Table will be added to  */  private void createPolylineTable(FeatureCollection featureCollection) {   // defines the schema for the geometry's attribute  List<Field> polylineFields = new ArrayList<>();  polylineFields.add(Field.createString("Boundary", "Boundary Name", 50));   // a feature collection table that creates polyline geometry  FeatureCollectionTable polylineTable = new FeatureCollectionTable(polylineFields, GeometryType.POLYLINE, WGS84);   // set a default symbol for features in the collection table  SimpleLineSymbol lineSymbol = new SimpleLineSymbol(SimpleLineSymbol.Style.DASH, Color.GREEN, 3);  SimpleRenderer renderer = new SimpleRenderer(lineSymbol);  polylineTable.setRenderer(renderer);   // add feature collection table to feature collection  featureCollection.getTables().add(polylineTable);   // create feature using the collection table by passing an attribute and geometry  Map<String, Object> attributes = new HashMap<>();  attributes.put(polylineFields.get(0).getName(), "AManAPlanACanalPanama");  PolylineBuilder builder = new PolylineBuilder(WGS84);  builder.addPoint(new Point(-79.497238, 8.849289, WGS84));  builder.addPoint(new Point(-80.035568, 9.432302, WGS84));  Feature addedFeature = polylineTable.createFeature(attributes, builder.toGeometry());   // add feature to collection table  polylineTable.addFeatureAsync(addedFeature);  }   /**  * Creates a Polygon Feature Collection Table with one Polygon and adds it to the Feature collection that was passed.  *  * @param featureCollection that the polygon Feature Collection Table will be added to  */  private void createPolygonTables(FeatureCollection featureCollection) {   // defines the schema for the geometry's attribute  List<Field> polygonFields = new ArrayList<>();  polygonFields.add(Field.createString("Area", "Area Name", 50));   // a feature collection table that creates polygon geometry  FeatureCollectionTable polygonTable = new FeatureCollectionTable(polygonFields, GeometryType.POLYGON, WGS84);   // set a default symbol for features in the collection table  SimpleLineSymbol lineSymbol = new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, Color.BLUE, 2);  SimpleFillSymbol fillSymbol = new SimpleFillSymbol(SimpleFillSymbol.Style.DIAGONAL_CROSS, Color.CYAN, lineSymbol);  SimpleRenderer renderer = new SimpleRenderer(fillSymbol);  polygonTable.setRenderer(renderer);   // add feature collection table to feature collection  featureCollection.getTables().add(polygonTable);   // create feature using the collection table by passing an attribute and geometry  Map<String, Object> attributes = new HashMap<>();  attributes.put(polygonFields.get(0).getName(), "Restricted area");  PolygonBuilder builder = new PolygonBuilder(WGS84);  builder.addPoint(new Point(-79.497238, 8.849289, WGS84));  builder.addPoint(new Point(-79.337936, 8.638903, WGS84));  builder.addPoint(new Point(-79.11409, 8.895422, WGS84));  Feature addedFeature = polygonTable.createFeature(attributes, builder.toGeometry());   // add feature to collection table  polygonTable.addFeatureAsync(addedFeature);  }   /**  * Stops and releases all resources used in application.  */  @Override  public void stop() {   if (mapView != null) {  mapView.dispose();  }  }   /**  * Opens and runs application.  *  * @param args arguments passed to this application  */  public static void main(String[] args) {   Application.launch(args);  } }

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