Terrain exaggeration

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Sample viewer app

Vertically exaggerate terrain in a scene.

screenshot

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::setElevationExaggeration.

Relevant API

  • Scene
  • Scene::baseSurface
  • Surface
  • Surface::elevationExaggeration

Tags

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

Sample Code

TerrainExaggeration.cppTerrainExaggeration.cppTerrainExaggeration.hTerrainExaggeration.qml
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// [WriteFile Name=TerrainExaggeration, Category=Scenes]
// [Legal]
// 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.
// [Legal]

#ifdef PCH_BUILD
#include "pch.hpp"
#endif // PCH_BUILD

#include "TerrainExaggeration.h"

#include "ArcGISTiledElevationSource.h"
#include "Scene.h"
#include "Camera.h"
#include "Point.h"
#include "SceneQuickView.h"

using namespace Esri::ArcGISRuntime;

TerrainExaggeration::TerrainExaggeration(QQuickItem* parent /* = nullptr */):
  QQuickItem(parent)
{
}

void TerrainExaggeration::init()
{
  // Register classes for QML
  qmlRegisterType<SceneQuickView>("Esri.Samples", 1, 0, "SceneView");
  qmlRegisterType<TerrainExaggeration>("Esri.Samples", 1, 0, "TerrainExaggerationSample");
}

void TerrainExaggeration::componentComplete()
{
  QQuickItem::componentComplete();

  // Create a scene and give it to the SceneView
  m_sceneView = findChild<SceneQuickView*>("sceneView");
  Scene* scene = new Scene(BasemapStyle::ArcGISTopographic, this);
  m_surface = new Surface(this);
  m_surface->elevationSources()->append(
        new ArcGISTiledElevationSource(
          QUrl("https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer"),
          this));

  // Create the camera object at our initial viewpoint
  const Point initialPoint(-119.9616962169934, 46.7000413426849, 3183, SpatialReference(4326));
  const Camera initialViewpointCamera(initialPoint, 0, 7, 70, 0);

  // Set the initial ViewpointCamera for the scene
  m_sceneView->setViewpointCamera(initialViewpointCamera);

  // Initialize the sceneview by applying the surface
  scene->setBaseSurface(m_surface);
  m_sceneView->setArcGISScene(scene);
}

void TerrainExaggeration::setElevationExaggeration(double factor)
{
  // If the surface exists, trigger a change in elevation exaggeration by [factor] amount
  if (m_surface)
    m_surface->setElevationExaggeration(factor);
}

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