View in QML C++ View on GitHub Sample viewer app
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.
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
Offline Data
To set up the sample's offline data, see the Use offline data in the samples section of the Qt Samples repository overview.
color ramp, elevation, hillshade, image, raster, raster layer, visualization
Sample CodeBlendRasterLayer.qml BlendRasterLayer.qml ColorRampModel.qml SlopeTypeModel.qml
Use dark colors for code blocks Copy
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
// [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]
import QtQuick
import QtQuick.Controls
import QtQuick.Layouts
import Esri.ArcGISRuntime
import Esri.ArcGISExtras
Rectangle {
id: rootRectangle
clip : true
width : 800
height : 600
readonly property url dataPath : {
Qt.platform.os === "ios" ?
System.writableLocationUrl(System.StandardPathsDocumentsLocation) + "/ArcGIS/Runtime/Data/raster" :
System.writableLocationUrl(System.StandardPathsHomeLocation) + "/ArcGIS/Runtime/Data/raster"
}
property bool editingRenderer : false
SlopeTypeModel {
id: slopeTypeModel
}
ColorRampModel {
id: colorRampModel
}
MapView {
anchors.fill : parent
Component.onCompleted : {
// Set the focus on MapView to initially enable keyboard navigation
forceActiveFocus();
}
Map {
id: map
basemap : basemap
}
}
Basemap {
id: basemap
RasterLayer {
id: rasterLayer
Raster {
id: baseRaster
path : dataPath + "/Shasta.tif"
}
}
}
Basemap {
id: basemapColorRamp
RasterLayer {
id: rasterLayerColorRamp
Raster {
path : dataPath + "/Shasta_Elevation.tif"
}
}
}
Raster {
id: elevationRaster
path : dataPath + "/Shasta_Elevation.tif"
}
Rectangle {
visible : editButton.visible
anchors.centerIn : editButton
radius : 8
height : editButton.height + ( 16 )
width : editButton.width + ( 16 )
color : "lightgrey"
border.color : "darkgrey"
border.width : 2
opacity : 0.75
}
Button {
id: editButton
anchors {
bottom : parent .bottom
horizontalCenter : parent .horizontalCenter
margins : 32
}
visible : rendererBox.width === 0
text : "Edit Renderer"
onClicked : editingRenderer = true ;
}
Rectangle {
id: rendererBox
clip : true
anchors {
right : parent .right
top : parent .top
bottom : parent .bottom
}
color : "white"
opacity : 0.75
width : editingRenderer ? parent.width : 0
GridLayout {
anchors {
centerIn : parent
margins : 24
}
columns : 2
Text {
text : "altitude"
}
SpinBox {
id: altSpinBox
from : 0
to : 90
editable : true
textFromValue : function ( value ) {
return value.toFixed( 0 ) + "\u00B0" ;
}
valueFromText : function ( text ) {
return parseInt (text);
}
}
Text {
text : "azimuth"
}
SpinBox {
id: azimuthSpinBox
from : 0
to : 360
editable : true
textFromValue : function ( value ) {
return value.toFixed( 0 ) + "\u00B0" ;
}
valueFromText : function ( text ) {
return parseInt (text);
}
}
Text {
text : "slope type"
}
ComboBox {
id: slopeCombo
property int modelWidth : 0
Layout.minimumWidth : modelWidth + leftPadding + rightPadding + (indicator ? indicator.width : 10 )
Layout.fillWidth : true
textRole : "name"
model : slopeTypeModel
Component.onCompleted : {
for ( let i = 0 ; i < model.count; ++i) {
metrics.text = model.get(i).name;
modelWidth = Math .max(modelWidth, metrics.width);
}
}
TextMetrics {
id: metrics
font : slopeCombo.font
}
}
Text {
text : "color ramp"
}
ComboBox {
id: colorCombo
property int modelWidth : 0
Layout.minimumWidth : modelWidth + leftPadding + rightPadding
Layout.fillWidth : true
textRole : "name"
model : colorRampModel
Component.onCompleted : {
for ( let i = 0 ; i < model.count; ++i) {
metrics2.text = model.get(i).name;
modelWidth = Math .max(modelWidth, metrics2.width);
}
}
TextMetrics {
id: metrics2
font : colorCombo.font
}
}
Button {
text : "Render"
Layout.columnSpan : 2
Layout.alignment : Qt.AlignHCenter
onClicked : {
editingRenderer = false ;
applyRendererSettings();
}
}
}
Behavior on width { PropertyAnimation { duration : 500 } }
}
function applyRendererSettings ( ) {
const blendRenderer = ArcGISRuntimeEnvironment.createObject( "BlendRenderer" );
blendRenderer.elevationRaster = elevationRaster;
blendRenderer.altitude = altSpinBox.value;
blendRenderer.azimuth = azimuthSpinBox.value;
blendRenderer.slopeType = slopeTypeModel.get(slopeCombo.currentIndex).value;
blendRenderer.colorRamp = getColorRamp();
blendRenderer.outputBitDepth = 8 ;
blendRenderer.gammas = [];
blendRenderer.noDataValues = [];
blendRenderer.outputMaxValues = [ 255 ];
blendRenderer.outputMinValues = [ 9 ];
blendRenderer.sourceMaxValues = [];
blendRenderer.sourceMinValues = [];
applyRenderer(blendRenderer);
map.basemap = (colorCombo.currentText !== "none" ) ? basemapColorRamp : basemap;
}
function applyRenderer ( blendRenderer ) {
const val = colorRampModel.get(colorCombo.currentIndex).value;
if (val.length === 0 )
rasterLayer.renderer = blendRenderer;
else
rasterLayerColorRamp.renderer = blendRenderer;
}
function getColorRamp ( ) {
const val = colorRampModel.get(colorCombo.currentIndex).value;
if (val.length === 0 )
return null ;
const colorRamp = ArcGISRuntimeEnvironment.createObject(val);
colorRamp.size = 800 ;
return colorRamp;
}
}