Specify a map's 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
- Instantiate a
Mapobject using a spatial reference e.g.ArcGISMap(SpatialReference.Create(54024)). - Instantiate a
Basemapobject using anArcGISMapImageLayerobject. - Set the base map to the map.
- Set the map to a
MapViewobject.
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
// Copyright 2022 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 Esri.ArcGISRuntime.Geometry; using Esri.ArcGISRuntime.Mapping; namespace ArcGIS.Samples.SetMapSpatialReference { [ArcGIS.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 partial class SetMapSpatialReference : ContentPage { public SetMapSpatialReference() { InitializeComponent(); // Create the UI, setup the control references and execute initialization 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 reproject itself to the map's spatial reference // Note: Some layer such as tiled layer cannot reproject 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; } } }