ShapePreservingArea(Geometry) Method

In This Topic

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

Visual Basic (Declaration)
C#

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

double ShapePreservingArea( 
   Geometry geometry
)

Parameters

geometry: The input geometry. Cannot be null and its spatial reference cannot be null.

Return Value

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

Exceptions

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

Example

Calculate area of geometry on surface of Earth's ellipsoid - ShapePreservingArea

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

  List<MapPoint> pts =
  [
    MapPointBuilderEx.CreateMapPoint(1.0, 1.0, 3.0),
  MapPointBuilderEx.CreateMapPoint(1.0, 3.0, 3.0),
  MapPointBuilderEx.CreateMapPoint(3, 3, 3.0),
  MapPointBuilderEx.CreateMapPoint(3.0, 1.0, 3.0),
];

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

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

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

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

  polygon = PolygonBuilderEx.CreatePolygon(
  [
    MapPointBuilderEx.CreateMapPoint( -170, 45),
  MapPointBuilderEx.CreateMapPoint( 170, 45),
  MapPointBuilderEx.CreateMapPoint( 170, -45),
  MapPointBuilderEx.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 Home, Pro, Enterprise (64 bit)

ArcGIS Pro version: 3.0 or higher.

Reference

IGeometryEngine Interface
IGeometryEngine Members
Overload List

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