[Qgis-user] filled polygon error

[Nicolas Cadieux]

Hi,

Just speculating as I do not know how simplification works but I imagine that only more complex shapes are being simplified. I also imagine that this simplification depends on the zoom level and depends on the total number of vertices in a shape therefore some island would not be filled in. I would expect multipolygons to exhibit this simplification faster than the polygon equivalents because they are more complex.  Depending on how files are being exported, some may be exported as polygons or multipolygons depending on file formats. This may be what is happening with the FIX Geometries. I imagine multiSurface may be treated as a mesh by QGIS??? Meshes have been introduced later in QGIS and I suspect it may not use the simplification.  This is pure speculation on my part.  

Bug reporting is done here.

https://www.qgis.org/en/site/getinvolved/development/bugreporting.html 

Nicolas

> Le 27 déc. 2019 à 14:43, malcolm <malcolmtmeyer at gmail.com> a écrit :
> 
> 
> Maybe a bug report, if so please advise where to submit.
> 
> With simplification turned on, some complex polygons with holes inside get filled when zoomed out. It does not happen to all the holes, only some of them. The fill goes away when zoomed way in say at 1:600 (feet) for some, or 1:50 for others. The layer is a Polygon(MultiPolygon) from Postgres. A view created from this layer (union of many polygons) that gets created as Polygon(MultiSurface) does not suffer from this error.
> 
> A temp layer created from FIX Geometries does not exhibit this error, but when exported to PostGIS and added back to QGIS the error returns.
> 
> -- 
> Malcolm T Meyer
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