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 Map object using a spatial reference e.g. ArcGISMap(SpatialReference.Create(54024)).
Instantiate a Basemap object using an ArcGISMapImageLayer object.
Set the base map to the map.
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 System;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using UIKit;
namespaceArcGISRuntime.Samples.SetMapSpatialReference{
[Register("SetMapSpatialReference")]
[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" })]
publicclassSetMapSpatialReference : UIViewController {
// Hold references to UI controls.private MapView _myMapView;
publicSetMapSpatialReference() {
Title = "Set map spatial reference";
}
privatevoidInitialize() {
// Create new Map using the World Bonne spatial reference (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;
}
publicoverridevoidViewDidLoad() {
base.ViewDidLoad();
Initialize();
}
publicoverridevoidLoadView() {
// Create the views. View = new UIView() { BackgroundColor = ApplicationTheme.BackgroundColor };
_myMapView = new MapView();
_myMapView.TranslatesAutoresizingMaskIntoConstraints = false;
// Add the views. View.AddSubviews(_myMapView);
// Lay out the views. NSLayoutConstraint.ActivateConstraints(new[]
{
_myMapView.TopAnchor.ConstraintEqualTo(View.SafeAreaLayoutGuide.TopAnchor),
_myMapView.BottomAnchor.ConstraintEqualTo(View.BottomAnchor),
_myMapView.LeadingAnchor.ConstraintEqualTo(View.LeadingAnchor),
_myMapView.TrailingAnchor.ConstraintEqualTo(View.TrailingAnchor)
});
}
}
}