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
A blend renderer can be used to apply a color ramp to a hillshade to emphasize areas of high or low elevation. A blend renderer can also be used to add a hillshade effect to aerial or satellite imagery, thereby making changes in elevation more visible.
How to use the sample
Choose and adjust the altitude, azimuth, slope type and color ramp type settings to update the image.
How it works
Create a Raster object from a raster file.
Create a RasterLayer object from the raster.
Create a Basemap object from the raster layer and set it to the map.
Create another Raster object for elevation from a grayscale raster file.
Create a BlendRenderer object, specifying the elevation raster, color ramp, and other properties.
If you specify a non-null color ramp, use the elevation raster as the base raster in addition to the elevation raster parameter. That way, the color ramp is used instead of the satellite imagery.
Set the blend renderer to the raster layer.
Relevant API
BlendRenderer
ColorRamp
Raster
RasterLayer
Tags
color ramp, elevation, hillshade, image, raster, raster layer, visualization
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/*
* 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.
*/package com.esri.samples.blend_renderer;
import java.io.File;
import java.util.Collections;
import javafx.fxml.FXML;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Slider;
import com.esri.arcgisruntime.layers.RasterLayer;
import com.esri.arcgisruntime.loadable.LoadStatus;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.Basemap;
import com.esri.arcgisruntime.mapping.view.MapView;
import com.esri.arcgisruntime.raster.BlendRenderer;
import com.esri.arcgisruntime.raster.ColorRamp;
import com.esri.arcgisruntime.raster.Raster;
import com.esri.arcgisruntime.raster.SlopeType;
publicclassBlendRendererController{
@FXMLprivate MapView mapView;
@FXMLprivate ComboBox<SlopeType> slopeTypeComboBox;
@FXMLprivate ComboBox<ColorRamp.PresetType> colorRampComboBox;
@FXMLprivate Slider azimuthSlider;
@FXMLprivate Slider altitudeSlider;
private String imageryRasterPath;
private String elevationRasterPath;
publicvoidinitialize(){
// create rasters imageryRasterPath = new File(System.getProperty("data.dir"), "./samples-data/raster/Shasta.tif").getAbsolutePath();
elevationRasterPath = new File(System.getProperty("data.dir"), "./samples-data/raster/Shasta_Elevation.tif").getAbsolutePath();
// create and load a raster layer RasterLayer rasterLayer = new RasterLayer(new Raster(imageryRasterPath));
// when the raster has loaded create a basemap from it and create a new ArcGISMap with the basemap rasterLayer.addDoneLoadingListener(() -> {
if (rasterLayer.getLoadStatus() == LoadStatus.LOADED) {
Basemap basemap = new Basemap(rasterLayer);
ArcGISMap map = new ArcGISMap(basemap);
// set the map to the map view mapView.setMap(map);
updateRenderer();
}
});
rasterLayer.loadAsync();
// set defaults colorRampComboBox.getItems().setAll(ColorRamp.PresetType.values());
colorRampComboBox.getSelectionModel().select(ColorRamp.PresetType.NONE);
slopeTypeComboBox.getItems().setAll(SlopeType.values());
slopeTypeComboBox.getSelectionModel().select(SlopeType.NONE);
// add listeners altitudeSlider.valueChangingProperty().addListener(o -> {
if (!altitudeSlider.isValueChanging()) {
updateRenderer();
}
});
azimuthSlider.valueChangingProperty().addListener(o -> {
if (!azimuthSlider.isValueChanging()) {
updateRenderer();
}
});
}
/**
* Updates the raster layer renderer according to the chosen property values.
*/publicvoidupdateRenderer(){
ColorRamp colorRamp;
// if the color ramp selection is none, don't apply a color ramp otherwise apply the selected color rampif (colorRampComboBox.getSelectionModel().getSelectedItem() == ColorRamp.PresetType.NONE) {
colorRamp = null;
} else {
colorRamp = new ColorRamp(colorRampComboBox.getSelectionModel().getSelectedItem(), 800);
}
// if color ramp is NONE, use the satellite imagery raster color instead of coloring the hillshade elevation raster RasterLayer rasterLayer;
if (colorRamp == null) {
rasterLayer = new RasterLayer(new Raster(imageryRasterPath));
} else {
rasterLayer = new RasterLayer(new Raster(elevationRasterPath));
}
// set the basemap to the raster layer mapView.getMap().setBasemap(new Basemap(rasterLayer));
// create blend renderer and set it to the raster layer BlendRenderer blendRenderer = new BlendRenderer(new Raster(elevationRasterPath), Collections.singletonList(9.0),
Collections.singletonList(255.0), null, null, null, null, colorRamp, altitudeSlider.getValue(),
azimuthSlider.getValue(), 1, slopeTypeComboBox.getSelectionModel().getSelectedItem(), 1, 1, 8);
rasterLayer.setRasterRenderer(blendRenderer);
}
/**
* Stops and releases all resources used in application.
*/voidterminate(){
if (mapView != null) {
mapView.dispose();
}
}
}