Raster layer (GeoPackage)

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Display a raster contained in a GeoPackage.

Image of raster layer GeoPackage

Use case

GeoPackages are designed to simplify file management and transfer. They can store raster files (as well as other types of data). An end-user wishing to transfer rasters from ArcGIS Pro or between runtime apps, might need to import raster files from GeoPackages into their map to view and analyze the data.

How to use the sample

When the sample starts, a raster will be loaded from a GeoPackage and displayed in the map view.

How it works

  1. Create and load a GeoPackage, specifying the path to the local .gpkg file.
  2. When it is done loading, get the GeoPackageRasters from the geopackage.
  3. Construct a RasterLayer with the geopackage raster you want to use.
  4. Add the raster layer to the map.

Relevant API

  • GeoPackage
  • GeoPackageRaster
  • RasterLayer

Offline data

This sample downloads the following items from ArcGIS Online automatically:

About the data

The Aurora Colorado GeoPackage holds datasets that cover Aurora, Colorado. The raster that is opened and displayed shows airport noise levels.

Tags

container, data, image, import, layer, OGC, package, raster, visualization

Sample Code

RasterLayerGeoPackage.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 ArcGISRuntime.Samples.Managers;
using Esri.ArcGISRuntime.Data;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Rasters;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using System.Linq;
using UIKit;

namespace ArcGISRuntime.Samples.RasterLayerGeoPackage
{
    [Register("RasterLayerGeoPackage")]
    [ArcGISRuntime.Samples.Shared.Attributes.OfflineData("68ec42517cdd439e81b036210483e8e7")]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Raster layer (GeoPackage)",
        category: "Data",
        description: "Display a raster contained in a GeoPackage.",
        instructions: "When the sample starts, a raster will be loaded from a GeoPackage and displayed in the map view.",
        tags: new[] { "OGC", "container", "data", "image", "import", "layer", "package", "raster", "visualization" })]
    public class RasterLayerGeoPackage : UIViewController
    {
        // Hold references to UI controls.
        private MapView _myMapView;

        public RasterLayerGeoPackage()
        {
            Title = "Raster layer (GeoPackage)";
        }

        private async void Initialize()
        {
            // Create a new map.
            _myMapView.Map = new Map(BasemapStyle.ArcGISLightGray);

            // Get the GeoPackage path.
            string geoPackagePath = DataManager.GetDataFolder("68ec42517cdd439e81b036210483e8e7", "AuroraCO.gpkg");

            try
            {
                // Open the GeoPackage.
                GeoPackage geoPackage = await GeoPackage.OpenAsync(geoPackagePath);

                // Read the raster images and get the first one.
                Raster gpkgRaster = geoPackage.GeoPackageRasters.FirstOrDefault();

                // Make sure an image was found in the package.
                if (gpkgRaster == null)
                {
                    return;
                }

                // Create a layer to show the raster.
                RasterLayer newLayer = new RasterLayer(gpkgRaster);
                await newLayer.LoadAsync();

                // Set the viewpoint.
                await _myMapView.SetViewpointAsync(new Viewpoint(newLayer.FullExtent));

                // Add the image as a raster layer to the map (with default symbology).
                _myMapView.Map.OperationalLayers.Add(newLayer);
            }
            catch (Exception e)
            {
                new UIAlertView("Error", e.ToString(), (IUIAlertViewDelegate) null, "OK", null).Show();
            }
        }

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

        public override void LoadView()
        {
            // Create the views.
            _myMapView = new MapView();
            _myMapView.TranslatesAutoresizingMaskIntoConstraints = false;

            View = new UIView() { BackgroundColor = ApplicationTheme.BackgroundColor };

            // 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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