topic Re: A feature overlapped with another feature in ArcObjects SDK Questions

A feature overlapped with another feature

ShaningYu — Thu, 29 Jun 2017 17:25:26 GMT

In my ArcObjects program, I need to check where a polygon feature (named f_A here) is included / overlapped with another polygon feature (named f_B hear). Is there an ArcObjects method for the this check-up? Thanks.

Re: A feature overlapped with another feature

MicahBabinski — Thu, 29 Jun 2017 18:02:26 GMT

Hi Shaning,

This would be really easy with arcpy, but from what I can tell this article might help you out with how to use the Intersect tool with ArcObjects geoprocessing:

https://www.esri.com/news/arcuser/1207/files/gp_arcobjects.pdf

Or, the ITopologicalOperator.Intersect method could be used to determine if there is overlap.

Good luck!

Micah

Re: A feature overlapped with another feature

JoshuaBixby — Thu, 29 Jun 2017 18:20:43 GMT

How to Execute Spatial Queries—ArcObjects 10.4 Help for Java | ArcGIS for Desktop . The article is for Java, but the concepts translate to .NET.

Re: A feature overlapped with another feature

ShaningYu — Thu, 29 Jun 2017 18:28:53 GMT

Thanks a lot.

Re: A feature overlapped with another feature

KenBuja — Sat, 11 Dec 2021 22:19:30 GMT

Here's how I determine if a polygon overlaps another polygon

pTopoOp = pFeature.Shape
Dim pInGeometry As ESRI.ArcGIS.Geometry.IGeometry5
pInGeometry = pOtherFeature.Shape
If pInGeometry.Dimension = ESRI.ArcGIS.Geometry.esriGeometryDimension.esriGeometry2Dimension Then 'check if the feature is a polygon
  pOverlapGeometry = pTopoOp.Intersect(pInGeometry, ESRI.ArcGIS.Geometry.esriGeometryDimension.esriGeometry2Dimension)
  If Not pOverlapGeometry Is Nothing And Not pOverlapGeometry.IsEmpty Then
    'you've got an overlapping polygon
  End If
End If‍‍‍‍‍‍‍‍‍

Re: A feature overlapped with another feature

ShaningYu — Thu, 29 Jun 2017 18:55:21 GMT

Ken: Thanks for your code. Could you tell me what is the data type of pOverlapGeometry since I need to convert your VB into c#. Thanks.

Re: A feature overlapped with another feature

KenBuja — Thu, 29 Jun 2017 19:29:48 GMT

It's an IGeometry5 object

Re: A feature overlapped with another feature

ShaningYu — Thu, 29 Jun 2017 19:39:56 GMT

Before I sent my last message to you, I did try but got error:

'ESRI.ArcGIS.Geometry.IGeometry5' does not contain a definition for 'Intersect' and no extension method 'Intersect' accepting a first argument of type 'ESRI.ArcGIS.Geometry.IGeometry5' could be found (are you missing a using directive or an assembly reference?) .

My code is below:

        bool feature_In_Other(IFeature f1, IFeature f2)   {
            IGeometry g = (IGeometry)f1.ShapeCopy; // also tried IGeometry5 g = (IGeometry5)f1.ShapeCopy;
            ESRI.ArcGIS.Geometry.IGeometry5 pInGeometry = (ESRI.ArcGIS.Geometry.IGeometry5)f2.ShapeCopy;
            if (pInGeometry.Dimension == ESRI.ArcGIS.Geometry.esriGeometryDimension.esriGeometry2Dimension)      {
                if (f1.ShapeCopy.GeometryType == esriGeometryType.esriGeometryPolygon)         {
                    ESRI.ArcGIS.Geometry.IGeometry5 pOverlapGeometry = g.Intersect(pInGeometry, ESRI.ArcGIS.Geometry.esriGeometryDimension.esriGeometry2Dimension); // Got error on this line

                }
            }
        }

What's wrong in my code? Thanks.

Re: A feature overlapped with another feature

KenBuja — Thu, 29 Jun 2017 20:01:24 GMT

The Intersect method is called on the ITopologyOperator object. In my code, that's what the pTopoOp is.

Dim pTopoOp As ESRI.ArcGIS.Geometry.ITopologicalOperator

Re: A feature overlapped with another feature

ShaningYu — Fri, 30 Jun 2017 11:45:41 GMT

Ken: I revised the code per your feedback. The error was gone. Thanks.