Edit KML ground overlay

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Edit the values of a KML ground overlay.

Image of edit 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 a Uri linking to an image.
Create a KmlGroundOverlay using the envelope and icon.
Set the value ofKmlGroundOverlay.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

Offline data

This sample uses an .jpg image downloaded from ArcGIS Online.

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.

Sample Code

EditKmlGroundOverlay.xaml

EditKmlGroundOverlay.xaml.cs

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﻿<ContentPage x:Class="ArcGISRuntimeXamarin.Samples.EditKmlGroundOverlay.EditKmlGroundOverlay"
             xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:esriUI="clr-namespace:Esri.ArcGISRuntime.Xamarin.Forms;assembly=Esri.ArcGISRuntime.Xamarin.Forms">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="auto" />
        </Grid.RowDefinitions>
        <esriUI:SceneView x:Name="MySceneView" Grid.Row="0" />
        <Grid Grid.Row="1">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="auto" />
                <ColumnDefinition Width="*" />
                <ColumnDefinition Width="auto" />
            </Grid.ColumnDefinitions>
            <Label Grid.Column="0"
                   Margin="5"
                   HorizontalTextAlignment="Center"
                   Text="Opacity"
                   VerticalTextAlignment="Center" />
            <Slider x:Name="OpacitySlider"
                    Grid.Column="1"
                    Margin="5"
                    Maximum="255"
                    MaximumTrackColor="CadetBlue"
                    Minimum="0"
                    MinimumTrackColor="CadetBlue"
                    Value="255" />
            <Label x:Name="ValueLabel"
                   Grid.Column="2"
                   Margin="5"
                   HorizontalTextAlignment="Center"
                   Text="255"
                   VerticalTextAlignment="Center"
                   WidthRequest="50" />
        </Grid>
    </Grid>
</ContentPage>