Set the terrain surface with elevation described by a raster file.
Use case
In a scene view, the terrain surface is what the basemap, operational layers, and graphics are draped onto. For example, when viewing a scene in a mountainous region, applying a terrain surface to the scene will help in recognizing the slopes, valleys, and elevated areas.
How to use the sample
When loaded, the sample will show a scene with a terrain surface applied. Pan and zoom to explore the scene and observe how the terrain surface allows visualizing elevation differences.
How it works
Create a Scene and add it to a SceneView.
Create a RasterElevationSource with a list of local raster file paths, in this case a single .dt2 file
Add this source to the scene's base surface: Scene::baseSurface::elevationSources::append(rasterElevationSource).
Relevant API
RasterElevationSource
Surface
Offline data
Read more about how to set up the sample's offline data here.
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// [WriteFile Name=CreateTerrainSurfaceFromLocalRaster, Category=Scenes]// [Legal]// 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.// [Legal]#ifdef PCH_BUILD#include"pch.hpp"#endif// PCH_BUILD#include"CreateTerrainSurfaceFromLocalRaster.h"#include"RasterElevationSource.h"#include"Scene.h"#include"SceneQuickView.h"#include"MapTypes.h"#include"Error.h"#include"Surface.h"#include"ElevationSourceListModel.h"#include"Camera.h"#include<QUrl>#include<QFileInfo>#include<QStandardPaths>usingnamespace Esri::ArcGISRuntime;
// helper method to get cross platform data pathnamespace{
QString defaultDataPath(){
QString dataPath;
#ifdef Q_OS_IOS dataPath = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);
#else dataPath = QStandardPaths::writableLocation(QStandardPaths::HomeLocation);
#endifreturn dataPath;
}
}
CreateTerrainSurfaceFromLocalRaster::CreateTerrainSurfaceFromLocalRaster(QObject* parent /* = nullptr */):
QObject(parent),
m_scene(newScene(BasemapStyle::ArcGISImageryStandard, this))
{
// create the MontereyElevation data path// data is downloaded automatically by the sample viewer app. Instructions to download// separately are specified in the readme.const QString montereyRasterElevationPath = QString{defaultDataPath() + "/ArcGIS/Runtime/Data/raster/MontereyElevation.dt2"};
//Before attempting to add any layers, check that the file for the elevation source exists at all.constbool srcElevationFileExists = QFileInfo::exists(montereyRasterElevationPath);
if(srcElevationFileExists)
{
//Create the elevation source from the local raster(s). RasterElevationSource can take multiple files as inputs, but in this case only takes one. RasterElevationSource* elevationSrc = new RasterElevationSource{QStringList{montereyRasterElevationPath}, this};
//When the elevation source is finished loading, call the elevationSrcFinishedLoading callback, so we can tell if it loaded succesfully.connect(elevationSrc, &RasterElevationSource::doneLoading, this, &CreateTerrainSurfaceFromLocalRaster::elevationSrcFinishedLoading, Qt::UniqueConnection);
// add the elevation source to the scene to display elevation m_scene->baseSurface()->elevationSources()->append(elevationSrc);
}
else {
qWarning() << "Could not find file at : " << montereyRasterElevationPath << ". Elevation source not set.";
}
}
voidCreateTerrainSurfaceFromLocalRaster::elevationSrcFinishedLoading(const Error& loadError){
if(loadError.isEmpty())
{
//Succesful loadqInfo() << "Loaded raster elevation source succesfully";
}
else {
//Log failure to loadqWarning() << "Error loading elevation source : " << loadError.message();
}
}
CreateTerrainSurfaceFromLocalRaster::~CreateTerrainSurfaceFromLocalRaster() = default;
voidCreateTerrainSurfaceFromLocalRaster::init(){
// Register classes for QML qmlRegisterType<SceneQuickView>("Esri.Samples", 1, 0, "SceneView");
qmlRegisterType<CreateTerrainSurfaceFromLocalRaster>("Esri.Samples", 1, 0, "CreateTerrainSurfaceFromLocalRasterSample");
}
SceneQuickView* CreateTerrainSurfaceFromLocalRaster::sceneView()const{
return m_sceneView;
}
// Set the view (created in QML)voidCreateTerrainSurfaceFromLocalRaster::setSceneView(SceneQuickView* sceneView){
if (!sceneView || sceneView == m_sceneView)
{
return;
}
m_sceneView = sceneView;
m_sceneView->setArcGISScene(m_scene);
// Create a camera, looking at Monterey, California.constexprdouble latitude = 36.51;
constexprdouble longitude = -121.80;
constexprdouble altitude = 300.0;
constexprdouble heading = 0.0;
constexprdouble pitch = 70.0;
constexprdouble roll = 0.0;
Camera camera{latitude, longitude, altitude, heading, pitch, roll};
// Set the sceneview to use above camera, waits for load so scene is immediately displayed in appropriate place. m_sceneView->setViewpointCameraAndWait(camera);
emit sceneViewChanged();
}