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Blend a hillshade with a raster by specifying the elevation data. The resulting raster looks similar to the original raster, but with some terrain shading, giving it a textured look.
Use case
BlendRenderer can be used to apply a color ramp to a hillshade to emphasize areas of high or low elevation. A BlendRenderer can also be used to add a hillshade effect to aerial or satellite imagery, thereby making changes in elevation more visible.
Tap on "Edit Renderer" in the toolbar to change the settings for the blend renderer. Choose and adjust the altitude, azimuth, slope type and color ramp type settings to update the image.
How it worksRaster object from a raster file.RasterLayer object from the raster.Basemap object from the raster layer and set it to the map.Raster object for elevation from a grayscale raster file.BlendRenderer object, specifying the elevation raster, color ramp, and other properties.
Read more about how to set up the sample's offline data here.
color ramp, elevation, hillshade, image, raster, raster layer, visualization
Sample CodeBlendRasterLayer.cpp BlendRasterLayer.cpp BlendRasterLayer.h ColorRampModel.qml SlopeTypeModel.qml BlendRasterLayer.qml
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// [WriteFile Name=BlendRasterLayer, Category=Layers]
// [Legal]
// Copyright 2017 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
// sample headers
#include "BlendRasterLayer.h"
// ArcGIS Maps SDK headers
#include "Basemap.h"
#include "BlendRenderer.h"
#include "ColorRamp.h"
#include "Map.h"
#include "MapQuickView.h"
#include "MapViewTypes.h"
#include "Raster.h"
#include "RasterLayer.h"
#include "RasterTypes.h"
// Qt headers
#include <QStandardPaths>
#include <QtCore/qglobal.h>
using namespace Esri::ArcGISRuntime;
// helper method to get cross platform data path
namespace
{
QString defaultDataPath()
{
QString dataPath;
#ifdef Q_OS_IOS
dataPath = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);
#else
dataPath = QStandardPaths::writableLocation(QStandardPaths::HomeLocation);
#endif
return dataPath;
}
} // namespace
BlendRasterLayer::BlendRasterLayer(QQuickItem* parent /* = nullptr */):
QQuickItem(parent),
m_dataPath(defaultDataPath() + "/ArcGIS/Runtime/Data/raster")
{
}
BlendRasterLayer::~BlendRasterLayer() = default;
void BlendRasterLayer::init()
{
// Register the map view for QML
qmlRegisterType<MapQuickView>("Esri.Samples", 1, 0, "MapView");
qmlRegisterType<BlendRasterLayer>("Esri.Samples", 1, 0, "BlendRasterLayerSample");
}
void BlendRasterLayer::componentComplete()
{
QQuickItem::componentComplete();
// find QML MapView component
m_mapView = findChild<MapQuickView*>("mapView");
m_mapView->setWrapAroundMode(WrapAroundMode::Disabled);
// Create the raster and raster layer
Raster* raster = new Raster(m_dataPath + "/Shasta.tif", this);
m_rasterLayer = new RasterLayer(raster, this);
m_elevationRaster = new Raster(m_dataPath + "/Shasta_Elevation.tif", this);
m_rasterLayerColorRamp = new RasterLayer(m_elevationRaster, this);
// Add the raster to the map
m_basemap = new Basemap(m_rasterLayer, this);
m_basemapColorRamp = new Basemap(m_rasterLayerColorRamp, this);
m_map = new Map(m_basemap, this);
m_mapView->setMap(m_map);
}
void BlendRasterLayer::applyRenderSettings(double altitude, double azimuth, int slopeTypeVal, int colorRampTypeVal)
{
PresetColorRampType colorRampType = static_cast<PresetColorRampType>(colorRampTypeVal);
RasterLayer* rasterLyr = rasterLayer(colorRampType != PresetColorRampType::None);
if (!rasterLyr)
return;
QList<double> outputMinValues{9};
QList<double> outputMaxValues{255};
QList<double> sourceMinValues;
QList<double> sourceMaxValues;
QList<double> noDataValues;
QList<double> gammas;
double zFactor = 1.;
double pixelSizeFactor = 1.;
double pixelSizePower = 1.;
int outputBitDepth = 8;
ColorRamp* colorRamp = ColorRamp::create(colorRampType, 800, this);
SlopeType slopeType = static_cast<SlopeType>(slopeTypeVal);
BlendRenderer* renderer = new BlendRenderer(m_elevationRaster,
outputMinValues,
outputMaxValues,
sourceMinValues,
sourceMaxValues,
noDataValues,
gammas,
colorRamp,
altitude,
azimuth,
zFactor,
slopeType,
pixelSizeFactor,
pixelSizePower,
outputBitDepth,
this);
rasterLyr->setRenderer(renderer);
}
RasterLayer* BlendRasterLayer::rasterLayer(bool useColorRamp)
{
m_map->setBasemap(useColorRamp ? m_basemapColorRamp : m_basemap);
return useColorRamp ? m_rasterLayerColorRamp : m_rasterLayer;
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