Using ArcGIS 10.4.1 a user in our department created a polygon and saved it to a feature class as shown below. The area covered is correct as at times it could overlap itself. I have calculated the number of parts of this self-intersecting feature and it only has 1 part. I also ran the Check Geometry tool and that resulted in no issues. Through ArcObjects I used the ITopologicalOperator4 on the polygon and that results in:

IsSimple=True
IsSimpleEx=True with reason=esriNonSimpleOK
IsKnownSimple=True

A couple of my questions: Is this a valid polygon? If so how can I programatically determine that a polygon is of this type that self-intersects? Can I run the Intersect tool on itself to determine I have a polygon of this type?

Using ArcGIS 10.4.1 a user in our department created a polygon and saved it to a feature class as shown below. The area covered is correct as at times it could overlap itself. I have calculated the number of parts of this self-intersecting feature and it only has 1 part. I also ran the Check Geometry tool and that resulted in no issues. Through ArcObjects I used the ITopologicalOperator4 on the polygon and that results in:

IsSimple=True
IsSimpleEx=True with reason=esriNonSimpleOK
IsKnownSimple=True

A couple of my questions:

• Is this a valid polygon?
• If so how can I programatically determine that a polygon is of this type that self-intersects?
• Can I run the Intersect tool on itself to determine I have a polygon of this type?