Find service area

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Find the service area within a network from a given point.

Image of find service area

Use case

A service area shows locations that can be reached from a facility based off a certain impedance, such as travel time or distance. Barriers can increase impedance by either adding to the time it takes to pass through the barrier or by altogether preventing passage.

You might calculate the region around a hospital in which ambulances can service in 30 min or less.

How to use the sample

In order to find any service areas at least one facility needs to be added to the map view.

To add a facility, tap the facility button, then tap anywhere on the map.
To add a barrier, tap the barrier button, and tap multiple locations on map. Hit the barrier button again to finish drawing barrier. Hitting any other button will also stop the barrier from drawing.
To show service areas around facilities that were added, tap show service areas button.
The reset button clears all graphics and resets the service area task.

How it works

Create a new ServiceAreaTask from a network service.
Create default ServiceAreaParameters from the service area task.
Set the parameters to return polygons (true) to return all service areas.
Add a ServiceAreaFacility to the parameters.
Get the ServiceAreaResult by solving the service area task using the parameters.
Get any ServiceAreaPolygons that were returned.
Display the service area polygons as graphics in a GraphicsOverlay on the MapView.

Relevant API

PolylineBarrier
ServiceAreaFacility
ServiceAreaParameters
ServiceAreaPolygon
ServiceAreaResult
ServiceAreaTask

Sample Code

FindServiceArea.xaml

FindServiceArea.xaml.cs

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﻿<?xml version="1.0" encoding="utf-8" ?>
<ContentPage x:Class="ArcGISRuntime.Samples.FindServiceArea.FindServiceArea"
             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="auto" />
            <RowDefinition Height="auto" />
            <RowDefinition Height="auto" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>
        <Button x:Name="PlaceFacilityButton"
                Grid.Row="0"
                Grid.Column="0"
                Clicked="PlaceFacilityButton_Click"
                HorizontalOptions="FillAndExpand"
                Text="Place Facility" />
        <Button x:Name="DrawBarrierButton"
                Grid.Row="0"
                Grid.Column="1"
                Clicked="DrawBarrierButton_Click"
                HorizontalOptions="FillAndExpand"
                Text="Draw Barrier" />
        <Button x:Name="ShowServiceAreasButton"
                Grid.Row="1"
                Grid.ColumnSpan="2"
                Clicked="ShowServiceAreasButton_Click"
                HorizontalOptions="FillAndExpand"
                Text="Show Service Areas" />
        <Button x:Name="ResetButton"
                Grid.Row="2"
                Grid.ColumnSpan="2"
                Clicked="Reset_Click"
                HorizontalOptions="FillAndExpand"
                Text="Reset" />
        <esriUI:MapView x:Name="MyMapView"
                        Grid.Row="3"
                        Grid.ColumnSpan="2" />
    </Grid>
</ContentPage>