IsSimpleOgc Method (IGeometryEngine)

In This Topic

Indicates if the given geometry is topologically consistent according to the Open Geospatial Consortium (OGC) validation specification.

Syntax

C#
Visual Basic (Declaration)

bool IsSimpleOgc( 
   Geometry geometry,
   out NonSimpleReason nonSimpleReason,
   bool forceIsSimple
)

Function IsSimpleOgc( _
   ByVal geometry As Geometry, _
   ByRef nonSimpleReason As NonSimpleReason, _
   Optional ByVal forceIsSimple As Boolean _
) As Boolean

Parameters

geometry: The geometry to be simplified.
nonSimpleReason: The reason that the geometry is non-simple.
forceIsSimple: (Optional) The default value is false. When true, it forces the simplification code to be applied to the geometry even if the geometry comes from a trusted source or has already been simplified. When false, the method will do nothing if called on the same geometry a second time.

Return Value

Returns true if the geometry is simple and false otherwise.

Exceptions

Exception	Description
System.ArgumentNullException	The input geometry is null.
System.NotImplementedException	The method is not implemented for GeometryBag or Multipatch.

Remarks

The OGC specification is defined in OpenGIS Implementation Standard for Geographic information – simple feature access – Part 1: common architecture.

A geometry that is OGC simple is simple for IsSimpleAsFeature and SimplifyAsFeature.

Example

SimplifyOgc


SpatialReference sr = SpatialReferences.WGS84;

Coordinate2D[] coords = new Coordinate2D[] { new Coordinate2D(5, 10), new Coordinate2D(15, 20), new Coordinate2D(25, 10), new Coordinate2D(5, 20) };
Polyline polyline = PolylineBuilderEx.CreatePolyline(coords, sr);
// polyline.IsKnownSimpleOgc = false
// polyline.IsKnownSimple = false

NonSimpleReason nonSimpleReason;
bool isSimple = GeometryEngine.Instance.IsSimpleOgc(polyline, out nonSimpleReason, true);
// isSimple = false
// nonSimpleReason = NonSimpleReason.SelfIntersections

Polyline simplePolyline = GeometryEngine.Instance.SimplifyOgc(polyline) as Polyline;
// simplePolyline.IsKnownSimpleOgc = true
// simplePolyline.IsKnownSimple = true



double resolution = sr.XYResolution;
Coordinate3D[] coords3D = new Coordinate3D[] { new Coordinate3D(0, 0, 0), new Coordinate3D(0, 1.8 * resolution, 0.8 * sr.ZTolerance), new Coordinate3D(10, 10, 1),
  new Coordinate3D(0, 5, 1) };
polyline = PolylineBuilderEx.CreatePolyline(coords3D, sr);

isSimple = GeometryEngine.Instance.IsSimpleOgc(polyline, out nonSimpleReason);
// isSimple = false
// nonSimpleReason = NonSimpleReason.ShortSegments

simplePolyline = GeometryEngine.Instance.SimplifyOgc(polyline, true) as Polyline;
// simplePolyline.IsKnownSimpleOgc = true
// simplePolyline.IsKnownSimple = true



coords = new Coordinate2D[] { new Coordinate2D(0, 0), new Coordinate2D(0, 0) };
Multipoint multipoint = MultipointBuilderEx.CreateMultipoint(coords, sr);

isSimple = GeometryEngine.Instance.IsSimpleOgc(multipoint, out nonSimpleReason);
// isSimple = false
// nonSimpleReason = NonSimpleReason.DuplicateVertex

Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3.2 or higher.

Reference

IGeometryEngine Interface
IGeometryEngine Members

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