Hi Gerd,
I guess there could exist instances, where sea/lake doesn't include a
hole and island can be overlaid over water. But these are errors easy to
correct in OSM data. Other function for these objects is to add a label
to an area.
In my styles I have removed islands from polygons but left them as a
POI. From your suggestions I would prefer to limit islands by size,
condition natural!=coastline probably won't work correctly for/because
of relations.
--
Best regards,
Andrzej
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