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I added a used the 'HoleCounter' and 'Tester' to filter out any polygons that had a '_hole_count' greater than one to get to the root cause.
This is because they are not proper holes, but "fake" ones created by digitising a zero width corridor. So the hole boundary is actually part of the exterior ...
Hi, Consider using the AggregateFilter to separate single-part polygons and multi-part polygons, and also the HoleCounter+Tester to filter polygons having hole(s).
Use the HoleCounter in FME
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