ShapePreservingArea 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)

double ShapePreservingArea( 
   Geometry geometry
)

Function ShapePreservingArea( _
   ByVal geometry As Geometry _
) As Double

Parameters

geometry: The input geometry.

Return Value

Area of the geometry in square meters.

Exceptions

Exception	Description
System.ArgumentNullException	Geometry is null or empty.
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);

Requirements

Target Platforms: Windows 10, Windows 8.1

Reference

IGeometryEngine Interface
IGeometryEngine Members