Terrain exaggeration

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Vertically exaggerate terrain in a scene.

Image of terrain exaggeration

Use case

Vertical exaggeration can be used to emphasize subtle changes in a surface. This can be useful in creating visualizations of terrain where the horizontal extent of the surface is significantly greater than the amount of vertical change in the surface. A fractional vertical exaggeration can be used to flatten surfaces or features that have extreme vertical variation.

How to use the sample

Use the slider to update terrain exaggeration.

How it works

  1. Create an elevation source and add it to a new surface.

    • An elevation source defines the terrain based on a digital elevation model (DEM) or digital terrain model (DTM).
  2. Add the surface.

    • The surface visualizes the elevation source.
  3. Configure the surface's elevation exaggeration using Surface.ElevationExaggeration.

Relevant API

  • Scene
  • Scene.BaseSurface
  • Surface
  • Surface.ElevationExaggeration

Tags

3D, DEM, DTM, elevation, scene, surface, terrain

Sample Code

TerrainExaggeration.cs
                                                                                                                          
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// Copyright 2019 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;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using UIKit;

namespace ArcGISRuntimeXamarin.Samples.TerrainExaggeration
{
    [Register("TerrainExaggeration")]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Terrain exaggeration",
        category: "Scene",
        description: "Vertically exaggerate terrain in a scene.",
        instructions: "Use the slider to update terrain exaggeration.",
        tags: new[] { "3D", "DEM", "DTM", "elevation", "scene", "surface", "terrain" })]
    public class TerrainExaggeration : UIViewController
    {
        // Hold references to UI controls.
        private SceneView _mySceneView;
        private UISlider _terrainSlider;

        // Hold a reference to the elevation surface.
        Surface _elevationSurface;

        private readonly string _elevationServiceUrl = "https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer";

        public TerrainExaggeration()
        {
            Title = "Terrain exaggeration";
        }

        private void Initialize()
        {
            // Configure the scene with National Geographic basemap.
            _mySceneView.Scene = new Scene(Basemap.CreateTopographic());

            // Add the base surface for elevation data.
            _elevationSurface = new Surface();
            ArcGISTiledElevationSource elevationSource = new ArcGISTiledElevationSource(new Uri(_elevationServiceUrl));
            _elevationSurface.ElevationSources.Add(elevationSource);

            // Add the surface to the scene.
            _mySceneView.Scene.BaseSurface = _elevationSurface;

            // Set the initial camera.
            MapPoint initialLocation = new MapPoint(-119.9489, 46.7592, 0, SpatialReferences.Wgs84);
            Camera initialCamera = new Camera(initialLocation, 15000, 40, 60, 0);
            _mySceneView.SetViewpointCamera(initialCamera);
        }

        private void TerrainSlider_ValueChanged(object sender, EventArgs e) => _elevationSurface.ElevationExaggeration = _terrainSlider.Value;

        public override void LoadView()
        {
            View = new UIView {BackgroundColor = ApplicationTheme.BackgroundColor};

            _mySceneView = new SceneView();
            _mySceneView.TranslatesAutoresizingMaskIntoConstraints = false;

            _terrainSlider = new UISlider();
            _terrainSlider.TranslatesAutoresizingMaskIntoConstraints = false;
            _terrainSlider.MinValue = 1;
            _terrainSlider.MaxValue = 3;

            UIToolbar toolbar = new UIToolbar();
            toolbar.TranslatesAutoresizingMaskIntoConstraints = false;

            View.AddSubviews(_mySceneView, toolbar);

            // Put the slider in the center with a fixed width.
            toolbar.Items = new[]
            {
                new UIBarButtonItem(UIBarButtonSystemItem.FlexibleSpace),
                new UIBarButtonItem(_terrainSlider) {Width = 250},
                new UIBarButtonItem(UIBarButtonSystemItem.FlexibleSpace)
            };

            // Set the layout constraints.
            _mySceneView.TopAnchor.ConstraintEqualTo(View.SafeAreaLayoutGuide.TopAnchor).Active = true;
            _mySceneView.BottomAnchor.ConstraintEqualTo(toolbar.TopAnchor).Active = true;
            _mySceneView.LeadingAnchor.ConstraintEqualTo(View.LeadingAnchor).Active = true;
            _mySceneView.TrailingAnchor.ConstraintEqualTo(View.TrailingAnchor).Active = true;

            toolbar.BottomAnchor.ConstraintEqualTo(View.SafeAreaLayoutGuide.BottomAnchor).Active = true;
            toolbar.LeadingAnchor.ConstraintEqualTo(View.LeadingAnchor).Active = true;
            toolbar.TrailingAnchor.ConstraintEqualTo(View.TrailingAnchor).Active = true;
        }

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

        public override void ViewWillAppear(bool animated)
        {
            base.ViewWillAppear(animated);

            // Subscribe to events.
            _terrainSlider.ValueChanged += TerrainSlider_ValueChanged;
        }

        public override void ViewDidDisappear(bool animated)
        {
            base.ViewDidDisappear(animated);

            // Unsubscribe from events, per best practice.
            _terrainSlider.ValueChanged -= TerrainSlider_ValueChanged;
        }
    }
}

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