ShapePreservingArea(Geometry,AreaUnit) Method

Calculates the area of the geometry on the surface of the Earth ellipsoid. This method preserves the shape of the geometry in its coordinate system.

Syntax

C#
Visual Basic (Declaration)

public double ShapePreservingArea( 
   Geometry geometry,
   AreaUnit areaUnit
)

Public Overloads Function ShapePreservingArea( _
   ByVal geometry As Geometry, _
   ByVal areaUnit As AreaUnit _
) As Double

Parameters

geometry: The input geometry. Cannot be null and its spatial reference cannot be null.
areaUnit: The unit of the output area. If null, the area is square meters.

Return Value

The calculated shape preserving area of the geometry in . If is null, then the shape preserving area is in square meters.

If the geometry is empty, then zero is returned.

Exceptions

Exception	Description
System.ArgumentNullException	Geometry is null.
System.NotImplementedException	The method is not implemented for GeometryBag or Multipatch.
ProjectionEngineException	Geometry is missing a spatial reference.
System.NotImplementedException	Spatial reference of geometryis an image coordinate system.

Example

// pt
MapPoint pt = MapPointBuilder.CreateMapPoint(1.0, 3.0, SpatialReferences.WebMercator);
double area = GeometryEngine.Instance.ShapePreservingArea(pt);         // area = 0

List<MapPoint> pts = new List<MapPoint>();
pts.Add(MapPointBuilder.CreateMapPoint(1.0, 1.0, 3.0));
pts.Add(MapPointBuilder.CreateMapPoint(1.0, 3.0, 3.0));
pts.Add(MapPointBuilder.CreateMapPoint(3, 3, 3.0));
pts.Add(MapPointBuilder.CreateMapPoint(3.0, 1.0, 3.0));

// multipoint
Multipoint mPt = MultipointBuilder.CreateMultipoint(pts);
area = GeometryEngine.Instance.ShapePreservingArea(mPt);               // area = 0

// polyline
Polyline polyline = PolylineBuilder.CreatePolyline(pts);
area = GeometryEngine.Instance.ShapePreservingArea(polyline);          // area = 0

// polygon
Polygon polygon = PolygonBuilder.CreatePolygon(pts, SpatialReferences.WGS84);
area = GeometryEngine.Instance.ShapePreservingArea(polygon);

polygon = PolygonBuilder.CreatePolygon(pts, SpatialReferences.WebMercator);
area = GeometryEngine.Instance.ShapePreservingArea(polygon);


polygon = PolygonBuilder.CreatePolygon(new[]
{
    MapPointBuilder.CreateMapPoint( -170, 45),
    MapPointBuilder.CreateMapPoint( 170, 45),
    MapPointBuilder.CreateMapPoint( 170, -45),
    MapPointBuilder.CreateMapPoint( -170, -54)
}, SpatialReferences.WGS84);

var area_meters = GeometryEngine.Instance.ShapePreservingArea(polygon);// , AreaUnits.SquareMeters);
var area_miles = GeometryEngine.Instance.ShapePreservingArea(polygon, AreaUnit.SquareMiles);

// area_meters - 352556425383104.37
// area_miles - 136122796.848425

Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

Reference

GeometryEngine Class
GeometryEngine Members
Overload List