ArcGIS Pro 3.1 API Reference Guide
ArcGIS.Core.Geometry Namespace / IGeometryEngine Interface / Area Method
The geometry of which the area will be calculated.
Example

In This Topic
    Area Method (IGeometryEngine)
    In This Topic
    Gets the area of the geometry. This is a planar measurement using 2D Cartesian mathematics to compute the area.
    Syntax
    Function Area( _
       ByVal geometry As Geometry _
    ) As Double

    Parameters

    geometry
    The geometry of which the area will be calculated.

    Return Value

    The computed area in the same units as the geometry's spatial reference unit. If the geometry is empty, then zero is returned.
    Exceptions
    ExceptionDescription
    Geometry is null.
    The method is not implemented for GeometryBag.
    Example
    Build a donut polygon
    List<Coordinate2D> outerCoordinates = new List<Coordinate2D>();
    outerCoordinates.Add(new Coordinate2D(10.0, 10.0));
    outerCoordinates.Add(new Coordinate2D(10.0, 20.0));
    outerCoordinates.Add(new Coordinate2D(20.0, 20.0));
    outerCoordinates.Add(new Coordinate2D(20.0, 10.0));
    
    // define the inner polygon as anti-clockwise
    List<Coordinate2D> innerCoordinates = new List<Coordinate2D>();
    innerCoordinates.Add(new Coordinate2D(13.0, 13.0));
    innerCoordinates.Add(new Coordinate2D(17.0, 13.0));
    innerCoordinates.Add(new Coordinate2D(17.0, 17.0));
    innerCoordinates.Add(new Coordinate2D(13.0, 17.0));
    
    PolygonBuilderEx pbEx = new PolygonBuilderEx(outerCoordinates);
    Polygon donutEx = pbEx.ToGeometry() as Polygon;
    double areaEx = donutEx.Area;       // area = 100
    
    pbEx.AddPart(innerCoordinates);
    donutEx = pbEx.ToGeometry() as Polygon;
    
    areaEx = donutEx.Area;    // area = 84.0
    
    areaEx = GeometryEngine.Instance.Area(donutEx);    // area = 84.0
    
    
    Determine area of a polygon
    var g1 = PolygonBuilderEx.FromJson("{\"rings\": [ [ [0, 0], [10, 0], [10, 10], [0, 10] ] ] }");
    double d = GeometryEngine.Instance.Area(g1);
    // d = -100.0         //negative due to wrong ring orientation
    d = GeometryEngine.Instance.Area(GeometryEngine.Instance.SimplifyAsFeature(g1));
    // d = 100.0        // feature has been simplifed; ring orientation is correct
    
    Requirements

    Target Platforms: Windows 11, Windows 10

    ArcGIS Pro version: 3.0 or higher.
    See Also