Raster layer (URL)

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Sample viewer app

Create a raster layer from a raster image service.

Image of raster layer URL

Use case

Accessing a raster image from an online service can be useful for analysing the most up-to-date data available for an area. For example, retrieving recent results of bathymetry surveys within a shipping channel monitored for its sediment build-up would allow planners to assess dredging needs.

How to use the sample

Simply launch the sample to see a raster from an image service being used on a map.

How it works

To add a RasterLayer as an operational layer from an ImageServiceRaster:

  1. Create an ImageServiceRaster using the service's URL
  2. Create a RasterLayer from the raster
  3. Add it as an operational layer with map.getOperationalLayers().add(rasterLayer)

About the data

This sample uses a NOAA raster image service. The service computes a hillshade image from the depth (in meters) of U.S. coastal waters.

Relevant API

  • ImageServiceRaster
  • RasterLayer

Tags

image service, raster

Sample Code

RasterLayerURLSample.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.raster_layer_url;

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

import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.geometry.SpatialReferences;
import com.esri.arcgisruntime.layers.RasterLayer;
import com.esri.arcgisruntime.loadable.LoadStatus;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.view.MapView;
import com.esri.arcgisruntime.raster.ImageServiceRaster;

public class RasterLayerURLSample extends Application {

  private MapView mapView;
  private RasterLayer rasterLayer; // keep loadable in scope to avoid garbage collection

  @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("Raster Layer URL 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 an image service raster from an online raster service
      ImageServiceRaster imageServiceRaster = new ImageServiceRaster("https://gis.ngdc.noaa.gov/arcgis/rest/services/bag_hillshades/ImageServer");

      // create a raster layer
      rasterLayer = new RasterLayer(imageServiceRaster);

      rasterLayer.addDoneLoadingListener(() -> {
        if (rasterLayer.getLoadStatus() != LoadStatus.LOADED) {
          new Alert(Alert.AlertType.ERROR, "Raster layer failed to load").show();
        }
      });

      // create a map with the dark gray basemap style
      ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_DARK_GRAY);

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

      // zoom in to the San Francisco Bay
      mapView.setViewpointCenterAsync(new Point(-13643095.660131, 4550009.846004, SpatialReferences.getWebMercator()), 100000);

      // add the raster layer as an operational layer
      map.getOperationalLayers().add(rasterLayer);

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