Thursday, 10 October 2019

shapefile - Polygon holes/rings are showing up as polygons in QGIS


I am having an issue in both QGIS 2.18.17 and QGIS 3.0.1. It is to do with holes/rings. Where there are meant to be holes/rings, actual polygons are showing, these are effectively coming in as polygons on top of polygons. I haven't produced these shapefiles but this is a problem for display purposes. A workaround to this is to upload the shapefiles to a postgres database, this displays the polygons as they should with the holes/rings.


Is there a setting in QGIS that can be turned on or configured to consume these polygons in the correct way?


UPDATE



The problem appears to be with converting from MapInfo .TAB to .SHP. The .TAB is displaying properly, the conversion to .SHP loses the rings.




I have attached screenshots showing the issue (green correct, red issue).enter image description here




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