ShapePreservingArea(Geometry,AreaUnit) 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

C#
Visual Basic (Declaration)

double ShapePreservingArea( 
   Geometry geometry,
   AreaUnit areaUnit
)

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

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

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

// polygon
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(new[]
{
    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, Windows 10

ArcGIS Pro version: 3 or higher.

Reference

IGeometryEngine Interface
IGeometryEngine Members
Overload List

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