Map spatial reference

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Sample viewer app

Specify a map's spatial reference.

Image of map spatial reference

Use case

Choosing the correct spatial reference is important for ensuring accurate projection of data points to a map.

How to use the sample

Pan and zoom around the map. Observe how the map is displayed using the World Bonne spatial reference.

How it works

  1. Instantiate an ArcGISMap object using a spatial reference e.g. ArcGISMap(SpatialReference.create(54024)).
  2. Instantiate a Basemap object using an ArcGISMapImageLayer object.
  3. Set the base map to the map.
  4. Set the map to a MapView object.

The ArcGIS map image layer will now use the spatial reference set to the ArcGIS map (World Bonne (WKID: 54024)) and not its default spatial reference.

Relevant API

  • ArcGISMap
  • ArcGISMapImageLayer
  • Basemap
  • MapView
  • SpatialReference

Additional information

Operational layers will automatically project to this spatial reference when possible.

Tags

project, spatial reference, WKID

Sample Code

MapSpatialReferenceSample.java
                                                                                                  
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/*
 * Copyright 2017 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.map_spatial_reference;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

import com.esri.arcgisruntime.geometry.SpatialReference;
import com.esri.arcgisruntime.layers.ArcGISMapImageLayer;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.Basemap;
import com.esri.arcgisruntime.mapping.view.MapView;

public class MapSpatialReferenceSample extends Application {

  private MapView mapView;

  private static final String IMAGE_LAYER_URL =
      "https://sampleserver6.arcgisonline.com/arcgis/rest/services/SampleWorldCities/MapServer";

  @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("Map Spatial Reference Sample");
      stage.setWidth(800);
      stage.setHeight(700);
      stage.setScene(scene);
      stage.show();

      // create a ArcGISMap with a spatial reference
      final ArcGISMap map = new ArcGISMap(SpatialReference.create(54024));

      // create a ArcGISMap image layer from url
      final ArcGISMapImageLayer mapImageLayer = new ArcGISMapImageLayer(IMAGE_LAYER_URL);

      // create basemap from the ArcGISMap image layer
      Basemap basemap = new Basemap(mapImageLayer);

      // add the basemap to the ArcGISMap
      map.setBasemap(basemap);

      // create a view and set ArcGISMap to it
      mapView = new MapView();
      mapView.setMap(map);

      // add the map view to stack pane
      stackPane.getChildren().add(mapView);

    } catch (Exception e) {
      // on any error, display the stack trace.
      e.printStackTrace();
    }
  }

  /**
   * 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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