GeoUtils Class

Cartography measurement API for maps with a geographical coordinate system.

Namespace: DevExpress.Xpf.Map

Assembly: DevExpress.Xpf.Map.v24.1.dll

NuGet Package: DevExpress.Wpf.Map

Declaration

C#

public static class GeoUtils

VB.NET

Public Module GeoUtils

Remarks

The GeoUtils class contains methods that allow you to calculate geometric values (for example, a shape perimeter or area) based on geographical coordinates.

The following list contains the main GeoUtils methods:

• CalculateArea(MapShape shape) computes a map shape’s total area, in square meters.

  C#

  private void MapControl_SelectionChanged(object sender, MapItemSelectionChangedEventArgs e) {
      MapShape mapShape = vectorLayer.SelectedItems[0] as MapShape;
      double areaByShape = GeoUtils.CalculateArea(mapShape) / 1000000;            
      label.Content = $"Shape Area: {areaByShape:F2} km²";
  }
  

  VB.NET

  Private Sub MapControl_SelectionChanged(ByVal sender As Object, ByVal e As MapItemSelectionChangedEventArgs)
      Dim mapShape As MapShape = CType(vectorLayer.SelectedItems(0),MapShape)
      Dim areaByShape As Double = (GeoUtils.CalculateArea(mapShape) / 1000000)
      label.Content = "Shape Area: {areaByShape:F2} km²"
  End Sub
  

• CalculateArea(IList<GeoPoint> points) calculates an area of the region given by geographical points, in square meters.

  C#

  double areaByPoints = GeoUtils.CalculateArea(new List<GeoPoint> {
      new GeoPoint(41, -109),
      new GeoPoint(41, -102),
      new GeoPoint(37, -102),
      new GeoPoint(37, -109)
  });
  

  VB.NET

  Dim areaByPoints As Double = GeoUtils.CalculateArea(New List(Of GeoPoint) From {
      New GeoPoint(41, -109),
      New GeoPoint(41, -102),
      New GeoPoint(37, -102),
      New GeoPoint(37, -109)
  })
  

• CalculateBearing(GeoPoint p1, GeoPoint p2) computes an angle between the Geodetic North direction and a line given by two points, clockwise in degrees.

  C#

  double bearing = GeoUtils.CalculateBearing(new GeoPoint(36.1, -115.1), new GeoPoint(35.9, -115.9));
  

  VB.NET

  Dim bearing As Double = GeoUtils.CalculateBearing(New GeoPoint(36.1, -115.1), New GeoPoint(35.9, -115.9))
  

• CalculateCenter(GeoPoint p1, GeoPoint p2) finds a center point between two geographical points.

  C#

  GeoPoint centerPoint = GeoUtils.CalculateCenter(
      new GeoPoint(35.286, -111.1724), 
      new GeoPoint(38.3802, -110.9307));
  

  VB.NET

  Dim centerPoint As GeoPoint = GeoUtils.CalculateCenter(New GeoPoint(35.286, -111.1724), New GeoPoint(38.3802, -110.9307))
  

• CalculateDistance(GeoPoint p1, GeoPoint p2) determines the distance between two geographical points in meters. The ellipsoidal model of the Earth is used in the calculations of the distance.

  C#

  double distance = GeoUtils.CalculateDistance(new GeoPoint(36.1, -115.1), new GeoPoint(34, -118.2));
  

  VB.NET

  Dim distance As Double = GeoUtils.CalculateDistance(New GeoPoint(36.1, -115.1), New GeoPoint(34, -118.2))
  

• CalculateDistance(GeoPoint p1, GeoPoint p2, Boolean ignoreEllipsoidalEffects) determines the distance between two geographical points in meters. This CalculateDistance method overload allows you to specify whether to use the ellipsoidal-surface formula or spherical-surface formula to calculate the distance.

  C#

  using DevExpress.Xpf.Map;
  
  private void OnButtonClick(object sender, RoutedEventArgs e) {
      double distance = GeoUtils.CalculateDistance(new GeoPoint(-5.93107, -35.112723), 
                                                  new GeoPoint(4.253438, 5.47072), true);
  }
  

  VB.NET

  Imports DevExpress.Xpf.Map
  
  Private Sub OnButtonClick(ByVal sender As Object, ByVal e As RoutedEventArgs)
      Dim distance As Double = GeoUtils.CalculateDistance(New GeoPoint(-5.93107, -35.112723), New GeoPoint(4.253438, 5.47072), True)
  End Sub
  

• CalculateDestinationPoint(GeoPoint startPoint, Double distance, Double bearing) calculates a geographical point based on the specified start point, distance, and bearing. The distance is measured along a geodesic line.

  C#

  GeoPoint startPoint = new GeoPoint(53.1914, 001.4347);
  GeoPoint destinationPoint = GeoUtils.CalculateDestinationPoint(startPoint, 17910000, 276.0117);
  

  VB.NET

  Dim startPoint As GeoPoint = New GeoPoint(53.1914, 001.4347)
  Dim destinationPoint As GeoPoint = GeoUtils.CalculateDestinationPoint(startPoint, 17910000, 276.0117)
  

• CalculateLength(IList<GeoPoint> points) calculates the polyline length, in meters.

  C#

  double lineLength = GeoUtils.CalculateLength(new List<GeoPoint> {
      new GeoPoint(35.286, -111.1724),
      new GeoPoint(38.3802, -110.9307),
      new GeoPoint(36.9365, -102.493)
  });
  

  VB.NET

  Dim lineLength As Double = GeoUtils.CalculateLength(New List(Of GeoPoint) From {
      New GeoPoint(35.286, -111.1724),
      New GeoPoint(38.3802, -110.9307),
      New GeoPoint(36.9365, -102.493)
  })
  

• CalculateStrokeLength(MapShape shape) returns the map shape’s stroke length, in meters.

  C#

  private void MapControl_SelectionChanged(object sender, MapItemSelectionChangedEventArgs e) {
      MapShape mapShape = vectorLayer.SelectedItems[0] as MapShape;
      double strokeLength = GeoUtils.CalculateStrokeLength(mapShape);
      label.Content = $"StokeLength: {strokeLength / 1000:F2} km";
  }
  

  VB.NET

  Private Sub MapControl_SelectionChanged(ByVal sender As Object, ByVal e As MapItemSelectionChangedEventArgs)
      Dim mapShape As MapShape = CType(vectorLayer.SelectedItems(0),MapShape)
      Dim strokeLength As Double = GeoUtils.CalculateStrokeLength(mapShape)
      label.Content = "StokeLength: {strokeLength / 1000:F2} km"
  End Sub
  

Inheritance

Object

GeoUtils