Hole displayed with a superposition of 2 polygon features

Mar 17, 2015 at 10:05 AM
I have sometimes an hole displayed when there is 2 polygon geometry superposed:

But it's not the case with all polygons geometries... I don't known why I have this problem with only some polygons features.

You will find at the following link the shape files containing an example of 2 polygon features which generates the problem:

Someone has already seen this issue?
Mar 25, 2015 at 8:50 AM
Your download doesn't work.
Mar 25, 2015 at 9:35 AM
Sorry. The new link to download the shp files:

Mar 25, 2015 at 2:30 PM
Checked your shape with ArcMap and got the expected ErrorMessage. The points of your first polygon are in the wrong order (counter-clockwise). Make sure polygon rings that are supposed to belong to the shell are clockwise. Holes on the other hand must be counter clockwise.
Mar 25, 2015 at 3:45 PM
Thanks a lot jany_!
We will try now to repair the geometry before to add it in DotSpatial.
Thanks again.