Raster layer (service)

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Create a raster layer from a raster image service.

Image of raster layer service

Use case

Accessing a raster image from an online service can be useful for analyzing the most up-to-date data available for an area. For example, retrieving recent results of bathymetry surveys within a shipping channel monitored for its sediment build-up would allow planners to assess dredging needs.

How to use the sample

Simply launch the sample to see a raster from an image service being used on a map.

How it works

  1. Create an ImageServiceRaster using the service's URL.
  2. Create a RasterLayer from the image service raster.
  3. Add the raster layer the the map.

About the data

This sample uses a NOAA raster image service. The service computes a hillshade image from the depth (in meters) of U.S. coastal waters.

Relevant API

  • ImageServiceRaster
  • RasterLayer

Tags

image service, raster

Sample Code

RasterLayerImageServiceRaster.cs
                                                                                        
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// 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 System;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Rasters;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using UIKit;

namespace ArcGISRuntime.Samples.RasterLayerImageServiceRaster
{
    [Register("RasterLayerImageServiceRaster")]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Raster layer (service)",
        category: "Layers",
        description: "Create a raster layer from a raster image service.",
        instructions: "Simply launch the sample to see a raster from an image service being used on a map.",
        tags: new[] { "image service", "raster" })]
    public class RasterLayerImageServiceRaster : UIViewController
    {
        // Hold references to UI controls.
        private MapView _myMapView;

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

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

            // Create a Uri to the image service raster.
            Uri uri = new Uri("https://gis.ngdc.noaa.gov/arcgis/rest/services/bag_hillshades/ImageServer");

            // Create new image service raster from the Uri.
            ImageServiceRaster imageServiceRaster = new ImageServiceRaster(uri);

            // Create a new raster layer from the image service raster.
            RasterLayer rasterLayer = new RasterLayer(imageServiceRaster);

            // Add the raster layer to the maps layer collection.
            myMap.OperationalLayers.Add(rasterLayer);

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

            // Zoom in to the San Francisco Bay.
            _myMapView.SetViewpointCenterAsync(new MapPoint(-13643095.660131, 4550009.846004, SpatialReferences.WebMercator), 100000);
        }

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

        public override void LoadView()
        {
            // 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)
            });
        }
    }
}

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