Viewshed for camera

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Analyze the viewshed for a camera. A viewshed shows the visible and obstructed areas from an observer's vantage point.

Image of viewshed for camera

Use case

A viewshed analysis is a type of visual analysis you can perform on a scene. The viewshed aims to answer the question 'What can I see from a given location?'. The output is an overlay with two different colors - one representing the visible areas (green) and the other representing the obstructed areas (red).

How to use the sample

The sample will start with a viewshed created from the initial camera location, so only the visible (green) portion of the viewshed will be visible. Move around the scene to see the obstructed (red) portions. Tap the button to update the viewshed to the current camera position.

How it works

Create a LocationViewshed, passing in a Camera and a min/max distance.
Update the viewshed using viewshed.UpdateFromCamera().

Relevant API

AnalysisOverlay
ArcGISTiledElevationSource
Camera
IntegratedMeshLayer
LocationViewshed
Scene
SceneView

About the data

The scene shows an integrated mesh layer of Girona, Spain with the World Elevation source image service both hosted on ArcGIS Online.

Sample Code

ViewshedCamera.xaml

ViewshedCamera.xaml.cs

Use dark colors for code blocksCopy
﻿<?xml version="1.0" encoding="utf-8" ?>
<ContentPage x:Class="ArcGISRuntime.Samples.ViewshedCamera.ViewshedCamera"
             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" />
        <Button x:Name="UpdateObserverButton"
                Grid.Row="1"
                Clicked="UpdateObserverWithCamera"
                Text="Viewshed from Here" />
    </Grid>
</ContentPage>