Hillshade renderer

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
// Copyright 2018 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 ArcGIS.Samples.Managers;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Rasters;
using System;
using System.Threading.Tasks;
using System.Windows;

namespace ArcGIS.WPF.Samples.RasterHillshade
{
    [ArcGIS.Samples.Shared.Attributes.Sample(
        name: "Hillshade renderer",
        category: "Layers",
        description: "Apply a hillshade renderer to a raster.",
        instructions: "Choose and adjust the settings to update the hillshade renderer on the raster layer. The sample allows you to change the Altitude, Azimuth, and Slope Type.",
        tags: new[] { "altitude", "angle", "azimuth", "raster", "slope", "visualization" })]
	[ArcGIS.Samples.Shared.Attributes.OfflineData("134d60f50e184e8fa56365f44e5ce3fb")]
    public partial class RasterHillshade
    {
        // Constant to store a z-factor (conversion constant) applied to the hillshade.
        // If needed, this can be used to convert z-values to the same unit as the x/y coordinates or to apply a vertical exaggeration.
        private const double ZFactor = 1.0;

        // Constants to store the Pixel Size Power and Pixel Size Factor values.
        // Use these to account for altitude changes (scale) as the viewer zooms in and out (recommended when using worldwide datasets).
        private const double PixelSizePower = 1.0;
        private const double PixelSizeFactor = 1.0;

        // Constant to store the bit depth (pixel depth), which determines the range of values that the hillshade raster can store.
        private const int PixelBitDepth = 8;

        // Store a reference to the layer
        private RasterLayer _rasterLayer;

        public RasterHillshade()
        {
            InitializeComponent();

            // Set up the map and load the raster layer from a local file
            _ = Initialize();
        }

        private async Task Initialize()
        {
            // Create a map with a streets basemap
            Map map = new Map(BasemapStyle.ArcGISStreets);

            // Get the file name for the local raster dataset
            string filepath = GetRasterPath();

            // Load the raster file
            Raster rasterFile = new Raster(filepath);

            try
            {
                // Create and load a new raster layer to show the image
                _rasterLayer = new RasterLayer(rasterFile);
                await _rasterLayer.LoadAsync();

                // Enable the apply renderer button when the layer loads.
                ApplyHillshadeButton.IsEnabled = true;

                // Create a viewpoint with the raster's full extent
                Viewpoint fullRasterExtent = new Viewpoint(_rasterLayer.FullExtent);

                // Set the initial viewpoint for the map
                map.InitialViewpoint = fullRasterExtent;

                // Add the layer to the map
                map.OperationalLayers.Add(_rasterLayer);

                // Add the map to the map view
                MyMapView.Map = map;

                // Add slope type values to the combo box
                foreach (object slope in Enum.GetValues(typeof(SlopeType)))
                {
                    SlopeTypeCombo.Items.Add(slope);
                }

                // Select the "Scaled" slope type enum
                SlopeTypeCombo.SelectedValue = SlopeType.Scaled;
            }
            catch (Exception e)
            {
                MessageBox.Show(e.ToString(), "Error");
            }
        }

        private void ApplyHillshadeButton_Click(object sender, System.Windows.RoutedEventArgs e)
        {
            // Get the current parameter values
            double altitude = AltitudeSlider.Value;
            double azimuth = AzimuthSlider.Value;
            SlopeType typeOfSlope = (SlopeType)SlopeTypeCombo.SelectedItem;

            // Create a hillshade renderer that uses the values selected by the user
            HillshadeRenderer hillshadeRenderer = new HillshadeRenderer(altitude, azimuth, ZFactor, typeOfSlope, PixelSizeFactor, PixelSizePower, PixelBitDepth);

            // Apply the new renderer to the raster layer
            _rasterLayer.Renderer = hillshadeRenderer;
        }

        private static string GetRasterPath()
        {
            return DataManager.GetDataFolder("134d60f50e184e8fa56365f44e5ce3fb", "srtm-hillshade", "srtm.tiff");
        }
    }
}