Raster layer (file)

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Create and use a raster layer made from a local raster file.

Image of apply raster layer file

Use case

Rasters can be digital aerial photographs, imagery from satellites, digital pictures, or even scanned maps. An end-user will frequently need to import raster files acquired through various data-collection methods into their map to view and analyze the data.

How to use the sample

When the sample starts, a raster will be loaded from a file and displayed in the map view.

How it works

  1. Create a Raster from a raster file.
  2. Create a RasterLayer from the raster.
  3. Add it as an operational layer with map.getOperationalLayers().add(rasterLayer).

Relevant API

  • Raster
  • RasterLayer

Additional information

See the topic What is raster data? in the ArcMap documentation for more information about raster images.

Offline Data

  1. Download the data from ArcGIS Online.
  2. Extract the contents of the downloaded zip file to disk.
  3. Open your command prompt and navigate to the folder where you extracted the contents of the data from step 1.
  4. Push the data into the scoped storage of the sample app: adb push raster-file /Android/data/com.esri.arcgisruntime.sample.rasterlayerfile/files/raster-file

Tags

data, image, import, layer, raster, visualization

Sample Code

MainActivity.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.arcgisruntime.sample.rasterlayerfile;

import android.os.Bundle;

import androidx.appcompat.app.AppCompatActivity;
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.layers.RasterLayer;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.view.MapView;
import com.esri.arcgisruntime.raster.Raster;

/**
 * A sample class which demonstrates loading a Raster from the local device.
 */
public class MainActivity extends AppCompatActivity {

  private MapView mMapView;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // authentication with an API key or named user is required to access basemaps and other
    // location services
    ArcGISRuntimeEnvironment.setApiKey(BuildConfig.API_KEY);

    // retrieve the MapView from layout
    mMapView = findViewById(R.id.mapView);
    // create a raster from a local raster file
    Raster raster = new Raster(getExternalFilesDir(null) + getString(R.string.shasta_tif));
    // create a raster layer
    final RasterLayer rasterLayer = new RasterLayer(raster);
    // create a Map with imagery basemap
    ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_IMAGERY);
    // add the map to a map view
    mMapView.setMap(map);
    // add the raster as an operational layer
    map.getOperationalLayers().add(rasterLayer);
    // set viewpoint on the raster
    rasterLayer.addDoneLoadingListener(() -> mMapView.setViewpointGeometryAsync(rasterLayer.getFullExtent(), 50));
  }

  @Override
  protected void onPause() {
    mMapView.pause();
    super.onPause();
  }

  @Override
  protected void onResume() {
    super.onResume();
    mMapView.resume();
  }

  @Override
  protected void onDestroy() {
    mMapView.dispose();
    super.onDestroy();
  }
}

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