Map spatial reference

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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 a Map 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 it's default spatial reference.

Relevant API

  • ArcGISMapImageLayer
  • Basemap
  • Map
  • MapView
  • SpatialReference

Additional information

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

Tags

project, WKID

Sample Code

SetMapSpatialReference.cs
                                                                         
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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.

using Android.App;
using Android.OS;
using Android.Widget;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI.Controls;
using System;

namespace ArcGISRuntime.Samples.SetMapSpatialReference
{
    [Activity (ConfigurationChanges=Android.Content.PM.ConfigChanges.Orientation | Android.Content.PM.ConfigChanges.ScreenSize)]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Map spatial reference",
        category: "Map",
        description: "Specify a map's spatial reference.",
        instructions: "Pan and zoom around the map. Observe how the map is displayed using the World Bonne spatial reference.",
        tags: new[] { "WKID", "project" })]
    public class SetMapSpatialReference : Activity
    {
        // Hold a reference to the map view
        private MapView _myMapView;

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            Title = "Set map spatial reference";
            // Create the UI, setup the control references and execute initialization
            CreateLayout();
            Initialize();
        }

        private void Initialize()
        {
            // Create new Map using spatial reference as World Bonne (54024)
            Map myMap = new Map(SpatialReference.Create(54024));

            // Adding a map image layer which can re-project itself to the map's spatial reference
            // Note: Some layer such as tiled layer cannot re-project and will fail to draw if their spatial
            // reference is not the same as the map's spatial reference
            ArcGISMapImageLayer operationalLayer = new ArcGISMapImageLayer(new Uri(
                "https://sampleserver6.arcgisonline.com/arcgis/rest/services/SampleWorldCities/MapServer"));

            // Add operational layer to the Map
            myMap.OperationalLayers.Add(operationalLayer);

            // Assign the map to the MapView
            _myMapView.Map = myMap;
        }

        private void CreateLayout()
        {
            // Create a new vertical layout for the app
            LinearLayout layout = new LinearLayout(this) { Orientation = Orientation.Vertical };

            // Add the map view to the layout
            _myMapView = new MapView(this);
            layout.AddView(_myMapView);

            // Show the layout in the app
            SetContentView(layout);
        }
    }
}

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