# Terrain exaggeration

Vertically exaggerate terrain in a scene.

## 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).
• 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.xaml.csTerrainExaggeration.xaml.csTerrainExaggeration.xaml
Use dark colors for code blocksCopy
``````﻿// Copyright 2022 Esri.
//
//
// 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.Geometry;
using Esri.ArcGISRuntime.Mapping;

namespace ArcGIS.Samples.TerrainExaggeration
{
[ArcGIS.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 partial class TerrainExaggeration : ContentPage
{
private readonly string _elevationServiceUrl = "https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer";

public TerrainExaggeration()
{
InitializeComponent();
Initialize();
}

private void Initialize()
{
// Configure the scene with National Geographic basemap.
MySceneView.Scene = new Scene(BasemapStyle.ArcGISImagery);

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

// 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);

// Initialise the terrain exaggeration label.
TerrainLabel.Text = TerrainSlider.Value.ToString("F");

// Update terrain exaggeration based on the slider value.
TerrainSlider.ValueChanged += (sender, e) =>
{
elevationSurface.ElevationExaggeration = TerrainSlider.Value;
TerrainLabel.Text = TerrainSlider.Value.ToString("F");
};
}
}
}``````