[Qgis-user] Vector smoothing (polygons): topology/geometry problems

[Stefan Giese (WhereGroup)]

Hi,

since QGIS 3.36 there is an new processing algorithm "coveragesimplify" 
(-> 
https://docs.qgis.org/testing/en/docs/user_manual/processing_algs/qgis/vectorcoverage.html#qgiscoveragesimplify) 
where no edges will cross or touch after the simplification...it 
requires version of GEOS >= 3.12

Best regards

Stefan

Am 18.03.2025 um 10:23 schrieb celati Laurent via QGIS-User:
> Dear all,
> I performed a raster segmentation from a Spot6 satellite image with 
> OTB. I polygonized/vectorized this raster segmentation in order to get 
> a vector file. To limit the pixelation of this cover, I was thinking 
> of smoothing the layer with the QGIS tool. This works, but the problem 
> is that it generates topology/geometry issues (overlap, holes, etc.). 
> And I can't afford to have invalid geometries. Could you share some 
> advices? Guidances in order to skip those problems? I've attached a 
> screenshot of the smoothed vector segmentation.
> Thanks so much.
> image.png
>
>
> _______________________________________________
> QGIS-User mailing list
> QGIS-User at lists.osgeo.org
> List info:https://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe:https://lists.osgeo.org/mailman/listinfo/qgis-user

-- 
Mit freundlichen Grüßen
Stefan Giese
Projektleiter/Consultant
---------------------------------------------
FOSSGIS Konferenz 2025 in Münster
26.-29. März 2025
https://www.fossgis.de/konferenz/
---------------------------------------------
WhereGroup GmbH
Schwimmbadstr. 2
79100 Freiburg
Germany

Tel.: +49 (0)761 / 519 102 - 61
Fax: +49 (0)761 / 519 102 - 11

stefan.giese at wheregroup.com
www.wheregroup.com
Geschäftsführer:
Olaf Knopp, Peter Stamm
Amtsgericht Bonn, HRB 9885
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20250318/45cd5c2d/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.png
Type: image/png
Size: 16411 bytes
Desc: not available
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20250318/45cd5c2d/attachment.png>