<div dir="ltr" gmail_original="1"><div>My go-to open-source tool for simplifying data and fixing topology issues is <a href="https://github.com/mbloch/mapshaper"><span id="gmail-mt-tracked-link_3_1742358643576" style="color: red;"></span>mapshaper</a>. With a single command you can fix gaps, slivers, overlaps etc. See tutorial <a href="https://mailtrack.io/l/da99c1253d9a5a1802e17b309f07d2e80211c817?w=cWdpcy11c2VyQGxpc3RzLm9zZ2VvLm9yZw&url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DiyDj8AvX3H0&u=8747767&signature=b0e19146e5a24474" data-mt-detrack-inspected="true">https://www.youtube.com/watch?v=iyDj8AvX3H0</a></div><div><div dir="ltr" class="gmail_signature"><div dir="ltr">---<div>Ujaval Gandhi</div><div>Spatial Thoughts</div><div><a href="https://mailtrack.io/l/f84aa9dae08254f210e6536694029b85c5e443b7?w=cWdpcy11c2VyQGxpc3RzLm9zZ2VvLm9yZw&url=http%3A%2F%2Fwww.spatialthoughts.com&u=8747767&signature=ccbe13c41fa147af" target="_blank" data-mt-detrack-inspected="true">www.spatialthoughts.com</a></div><div><br></div></div></div></div><br></div><br><img width="0" height="0" class="mailtrack-img" alt="" style="display:flex" src="https://mailtrack.io/trace/mail/w/cWdpcy11c2VyQGxpc3RzLm9zZ2VvLm9yZw/33be022fbed8b55da08680bfcb22b14f33292a15.png?u=8747767" ><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Mar 18, 2025 at 3:14 PM Stefan Giese (WhereGroup) via QGIS-User <<a href="mailto:qgis-user@lists.osgeo.org" target="_blank">qgis-user@lists.osgeo.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><u></u>
<div>
<p>Hi,<br>
</p>
<p>since QGIS 3.36 there is an new processing algorithm
"coveragesimplify" (->
<a href="https://docs.qgis.org/testing/en/docs/user_manual/processing_algs/qgis/vectorcoverage.html#qgiscoveragesimplify" target="_blank">https://docs.qgis.org/testing/<wbr>en/docs/user_manual/<wbr>processing_algs/qgis/<wbr>vectorcoverage.html#<wbr>qgiscoveragesimplify</a>)
where no edges will cross or touch after the simplification...it
requires version of GEOS >= 3.12<br>
</p>
<p>Best regards</p>
<p>Stefan<br>
</p>
<div>Am 18.03.2025 um 10:23 schrieb celati
Laurent via QGIS-User:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>Dear all, </div>
<div>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. <br>
</div>
<div>Thanks so much. <br>
</div>
<div><img src="https://mail.google.com/mail/u/0?ui=2&ik=f532d47391&attid=0.1&permmsgid=msg-a:r-6003330744555848179&view=fimg&fur=ip&permmsgid=msg-a:r-6003330744555848179&sz=s0-l75-ft&attbid=ANGjdJ9JDUsQqM6Feikf3BNQvhKrU-lTKiCp8duvPNhaFvkMpVW3bmLpzVr584-izw9rvLG-s6kKE4Htyuo7NEE2WLGfgrXzXYyNTzIj82hXgYEqFgI6GDUIS7zNISw&disp=emb&realattid=ii_195a982f65ecb971f161&zw" alt="image.png" width="578" height="347" data-surl="cid:ii_195a982f65ecb971f161" jslog="138226; u014N:xr6bB; 53:WzAsMF0."><br>
<br>
</div>
</div>
<br>
<fieldset></fieldset>
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</blockquote>
<pre cols="72">--
Mit freundlichen Grüßen
Stefan Giese
Projektleiter/Consultant
------------------------------<wbr>---------------
FOSSGIS Konferenz 2025 in Münster
26.-29. März 2025
<a href="https://www.fossgis.de/konferenz/" target="_blank">https://www.fossgis.de/<wbr>konferenz/</a>
------------------------------<wbr>---------------
WhereGroup GmbH
Schwimmbadstr. 2
79100 Freiburg
Germany
Tel.: +49 (0)761 / 519 102 - 61
Fax: +49 (0)761 / 519 102 - 11
<a href="mailto:stefan.giese@wheregroup.com" target="_blank">stefan.giese@wheregroup.com</a>
<a href="http://www.wheregroup.com" target="_blank">www.wheregroup.com</a>
Geschäftsführer:
Olaf Knopp, Peter Stamm
Amtsgericht Bonn, HRB 9885</pre>
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