Edit the values of a KML ground overlay.
Use case
KML ground overlays are used for showing aerial imagery, symbology, or other images draped over a scene. Changing the geometry, rotation, and other attributes of a ground overlay after it has been loaded allows for live editing. For example, editing the geometry and opacity of a historical image draped over present day satellite imagery makes it possible to view change over time.
How to use the sample
Use the slider to adjust the opacity of the ground overlay.
How it works
- Create an
Envelope
defining the geometry of the overlay. - Create a
KmlIcon
using aUrl
linking to an image. - Create a
KmlGroundOverlay
using the envelope and icon. - Set the value of
KmlGroundOverlay.rotation
. - Create a
KmlDataset
using the ground overlay. - Create a
KmlLayer
using the dataset. - Add the KML layer to the scene.
- Listen for changes to the opacity slider and change the
KmlGroundOverlay.color
value appropriately.
Relevant API
- KmlDataset
- KmlGroundOverlay
- KmlIcon
- KmlLayer
About the data
The image used in this sample is an aerial view of the campus of the University of Oregon. This imagery was taken in 1944 by the U.S. Army Corps of Engineers. It is publicly available as Online Aerial Imagery hosted by Oregon University Library. It is also available as a Portal item on ArcGIS Online as University of Oregon Campus Aerial Imagery - 1944.
Tags
imagery, keyhole, KML, KMZ, OGC
Sample Code
// [WriteFile Name=EditKmlGroundOverlay, Category=EditData]
// [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]
import QtQuick 2.6
import QtQuick.Controls 2.3
import Esri.ArcGISRuntime 100.15
import Esri.ArcGISExtras 1.1
Rectangle {
id: rootRectangle
clip: true
width: 800
height: 600
readonly property url dataPath: System.userHomePath + "/ArcGIS/Runtime/Data/raster/"
SceneView {
id: sceneView
anchors.fill: parent
Component.onCompleted: {
// Set the focus on SceneView to initially enable keyboard navigation
forceActiveFocus();
}
Scene {
Basemap {
initStyle: Enums.BasemapStyleArcGISImageryStandard
}
// Create a KML Layer
KmlLayer {
id: kmlLayer
// Create a KML Dataset
KmlDataset {
// Create a Ground Overlay by assigning an icon and geometry
KmlGroundOverlay {
id: groundOverlay
rotation: -3.046024799346924
KmlIcon {
url: dataPath + "1944.jpg"
}
Envelope {
id: env
xMin: -123.066227926904
yMin: 44.04736963555683
xMax: -123.0796942287304
yMax: 44.03878298600624
SpatialReference {
wkid: 4326
}
}
}
}
// set viewpoint to the ground overlay
onLoadStatusChanged: {
if (loadStatus !== Enums.LoadStatusLoaded)
return;
const camera = ArcGISRuntimeEnvironment.createObject("Camera", {
location: env.center,
distance: 1250,
heading: 45,
pitch: 60,
roll: 0
});
sceneView.setViewpointCamera(camera);
}
}
}
}
Rectangle {
anchors.fill: slider
radius: 5
}
Slider {
id: slider
anchors {
left: parent.left
top: parent.top
margins: 10
}
from: 0
to: 1
value: 1
stepSize: 0.1
onValueChanged: {
// modify the overlay's color/alpha value
groundOverlay.color = Qt.rgba(0, 0, 0, value);
}
}
}