Geodesic operations

Calculate a geodesic path between two points and measure its distance.

Use case

A geodesic distance provides an accurate, real-world distance between two points. Visualizing flight paths between cities is a common example of a geodesic operation since the flight path between two airports takes into account the curvature of the earth, rather than following the planar path between those points, which appears as a straight line on a projected map.

How to use the sample

Click anywhere on the map. A line graphic will display the geodesic line between the two points. In addition, text that indicates the geodesic distance between the two points will be updated. Click elsewhere and a new line will be created.

How it works

1. A Point is created in New York City and displayed as a Graphic.
2. When a click occurs on the MapView, a new Point is obtained from the mouse click. This Point is added as a Graphic.
3. A Polyline is created with the two Point objects.
4. GeometryEngine.DensifyGeodetic is executed by passing in the Polyline object, and the returned Geometry is added as a Graphic.
5. GeometryEngine.LengthGeodetic is executed by passing in the two Point objects, and the returned number is displayed on the screen.

Relevant API

• GeometryEngine.DensifyGeodetic
• GeometryEngine.LengthGeodetic

About the data

The Imagery basemap provides the global context for the displayed geodesic line.

Tags

densify, distance, geodesic, geodetic

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
<UserControl
    x:Class="ArcGIS.UWP.Samples.GeodesicOperations.GeodesicOperations"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:controls="using:Esri.ArcGISRuntime.UI.Controls">
    <Grid>
        <controls:MapView x:Name="MyMapView" />
        <Border Style="{StaticResource BorderStyle}">
            <StackPanel>
                <TextBlock x:Name="ResultsLabel"
                           Text="Tap to set an end point."
                           FontWeight="SemiBold"
                           TextAlignment="Center" />
            </StackPanel>
        </Border>
    </Grid>
</UserControl>