ArcGIS raster layer (service)

This sample demonstrates how to show a raster layer on a map based on an image service layer.

Raster layer from an image service

Code

// Copyright 2017 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.Mapping;
using Esri.ArcGISRuntime.Rasters;
using Esri.ArcGISRuntime.ArcGISServices;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using System;
using UIKit;

namespace ArcGISRuntimeXamarin.Samples.RasterLayerImageServiceRaster
{
    [Register("RasterLayerImageServiceRaster")]
    public class RasterLayerImageServiceRaster : UIViewController
    {
        // Constant holding offset where the MapView control should start
        private const int yPageOffset = 60;

        // Create and hold reference to the used MapView
        private MapView _myMapView = new MapView();

        public RasterLayerImageServiceRaster()
        {
            Title = "ArcGIS raster layer (service)";
        }

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();

            // Create the UI, setup the control references and execute initialization 
            CreateLayout();
            Initialize();
        }

        public override void ViewDidLayoutSubviews()
        {
            // Setup the visual frame for the MapView
            _myMapView.Frame = new CoreGraphics.CGRect(0, 0, View.Bounds.Width, View.Bounds.Height);

            base.ViewDidLayoutSubviews();
        }

        private async void Initialize()
        {
            // Create new map with the dark gray canvas basemap
            Map myMap = new Map(Basemap.CreateDarkGrayCanvasVector());

            // Create a Uri to the image service raster (NOTE: iOS applications require the use of Uri's to be https:// and not http://)
            var myUri = new Uri("https://sampleserver6.arcgisonline.com/arcgis/rest/services/NLCDLandCover2001/ImageServer");

            // Create new image service raster from the Uri
            ImageServiceRaster myImageServiceRaster = new ImageServiceRaster(myUri);

            // Load the image service raster
            await myImageServiceRaster.LoadAsync();

            // Get the service information (aka. metadata) about the image service raster
            ArcGISImageServiceInfo myArcGISImageServiceInfo = myImageServiceRaster.ServiceInfo;

            // Create a new raster layer from the image service raster
            RasterLayer myRasterLayer = new RasterLayer(myImageServiceRaster);

            // Add the raster layer to the maps layer collection
            myMap.Basemap.BaseLayers.Add(myRasterLayer);

            // Assign the map to the map view
            _myMapView.Map = myMap;

            // Zoom the map to the extent of the image service raster (which also the extent of the raster layer)
            await _myMapView.SetViewpointGeometryAsync(myArcGISImageServiceInfo.FullExtent);

            // NOTE: The sample zooms to the extent of the ImageServiceRaster. Currently the ArcGIS Runtime does not 
            // support zooming a RasterLayer out beyond 4 times it's published level of detail. The sample uses 
            // MapView.SetViewpointCenterAsync() method to ensure the image shows when the app starts. You can see 
            // the effect of the image service not showing when you zoom out to the full extent of the image and beyond.        }
        }

        private void CreateLayout()
        {
            // Add MapView to the page
            View.AddSubviews(_myMapView);
        }
    }
}


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