I am running queries against a polygon layer using the ArcGIS SOAP Web Service. A user selects a point within that layer and the resulting feature set contains PolygonN objects.
Occasionally, the polygons that come back contain negative space. These are also known as donut or island polygons. Here is an example:
In this case, I would only want the geometry contained in the purple area, not the green area.
The inner ring, as far as I can tell, has no way to indicate that it is actually negative space. So the resulting polygon looks like it has 2 solid shapes, when in fact it is only one shape with a hole in the center.
Does anyone know how I can determine that a polygon's ring is actually negative space?