GeodesicEllipse Method (GeometryEngine)
In This Topic
The function returns a piecewise approximation of a geodesic ellipse (or
geodesic circle, if semiAxis1Length = semiAxis2Length). Constructs a geodesic
ellipse centered on the specified point. If this method is used to generate
a polygon or a polyline, the result may have more than one part, depending
on the size of the ellipse and its position relative to the horizon of the
coordinate system. When the method generates a polyline or a multipoint,
the result vertices lie on the boundary of the ellipse. When a polygon is
generated, the interior of the polygon is the interior of the ellipse, however
the boundary of the polygon may contain segments from the spatial reference
horizon, or from the GCS extent.
Syntax
Parameters
- parameter
- The geodesic ellipse parameter that describes how to create the geodesic ellipse.
- spatialReference
Return Value
The geometry that contains the geodesic ellipse.
Exceptions
Example
GeodesicEllipse
GeodesicEllipseParameter param = new GeodesicEllipseParameter();
param.AxisDirection = 4 * Math.PI / 3;
param.Center = new Coordinate2D(-120, 60);
param.LinearUnit = LinearUnit.Meters;
param.OutGeometryType = GeometryType.Polyline;
param.SemiAxis1Length = 6500000;
param.SemiAxis2Length = 1500000;
param.VertexCount = 800;
Geometry geometry = GeometryEngine.Instance.GeodesicEllipse(param, SpatialReferences.WGS84);
// geometry.IsEmpty = false
Polyline polyline = geometry as Polyline;
// polyline.PointCount = 801
// polyline.PartCount = 1
Requirements
Target Platforms: Windows 11, Windows 10
ArcGIS Pro version: 3 or higher.
See Also