Set 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 basemap to the map using map.setBasemap(basemap).
  4. Pass the map to a MapView object using MapView.setMap(map).

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
  • BasemapStyle
  • MapView
  • SpatialReference

Additional information

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

Tags

project, SpatialReference, WKID

Sample Code

MainActivity.java
                                                                         
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/* 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.arcgisruntime.sample.mapspatialreference;

import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;

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 MainActivity extends AppCompatActivity {

  private MapView mMapView;

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

    // get a reference to the map view
    mMapView = findViewById(R.id.mapView);

    // create a map with World_Bonne projection
    ArcGISMap map = new ArcGISMap(SpatialReference.create(54024));

    //Adding a map image layer which can re-project itself to the map's spatial reference
    ArcGISMapImageLayer mapImageLayer = new ArcGISMapImageLayer(getString(R.string.world_cities_service));

    // set the map image layer as basemap
    Basemap basemap = new Basemap(mapImageLayer);

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

    // set the map to be displayed in this view
    mMapView.setMap(map);
  }

  @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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