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ArcGIS Runtime SDK for .NET

Set map spatial reference

This code sample is available for these platforms:
View Sample on GitHub

Specify a map's spatial reference.

screenshot

Use case

Choosing the correct spatial reference is important for ensuring accurate projection of data points to a map.

How it works

  1. Instantiate an 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. Display the map in a map view.

Relevant API

  • Map
  • ArcGISMapImageLayer
  • Basemap
  • MapView
  • SpatialReference

Additional information

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

Tags

SpatialReference, WKID, project

Sample Code

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"             
             xmlns:esriUI="clr-namespace:Esri.ArcGISRuntime.Xamarin.Forms;assembly=Esri.ArcGISRuntime.Xamarin.Forms"
             xmlns:mapping="clr-namespace:Esri.ArcGISRuntime.Mapping;assembly=Esri.ArcGISRuntime" 
             x:Class="ArcGISRuntime.Samples.SetMapSpatialReference.SetMapSpatialReference">
  <Grid>
    <esriUI:MapView x:Name="MyMapView"/>
  </Grid>
</ContentPage>
// 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 Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using System;
using Xamarin.Forms;

namespace ArcGISRuntime.Samples.SetMapSpatialReference
{
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        "Set map spatial reference",
        "Map",
        "This sample demonstrates how you can set the spatial reference on a Map and all the operational layers would project accordingly.",
        "")]
    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;
        }
    }
}