<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">« <span style="font-family: monospace;">I'm sure there's got to be some combination of buffering, clipping, difference, intersection, union, and dissolve operations that will get me what I need, but I just can't visualise it. »</span><div><font face="monospace">Yup!</font></div><div><font face="monospace"><br></font></div><div><font face="monospace">If you can send me a copy or part of the files, I could have a shot at it and then give you the breakdown. <br></font><br><div dir="ltr">Nicolas Cadieux<div><a href="https://gitlab.com/njacadieux">https://gitlab.com/njacadieux</a></div></div><div dir="ltr"><br><blockquote type="cite">Le 2 mars 2023 à 12:48, Cory Albrecht via QGIS-User <qgis-user@lists.osgeo.org> a écrit :<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-family:monospace"><div class="gmail_default">Hello,</div><div class="gmail_default"><br></div><div class="gmail_default">I've been trying to find a way to buffer a bunch of touching polygons so that the touching sides get buffered, only the "outside".</div><div class="gmail_default"><br></div><div class="gmail_default">I'm working off a shapefile of Scotland's 1930s civil parishes that I need to combine with another map of Scotland that has better coastal resolution and more complete islands. But the civil parishes map has a different coastline so I need to make that outer edge of the outer ring of parishes match the higher resolution coastline data, not worrying about the extra islands for the moment.</div><div class="gmail_default"><br></div><div class="gmail_default">Regular buffer won't work, because all polygons will get extended and there will be overlaps.</div><div class="gmail_default"><br></div><div class="gmail_default">I tried using this solution:</div><div class="gmail_default"><br></div><div class="gmail_default"><a href="https://gis.stackexchange.com/questions/175599/buffer-neighbouring-polygons-without-overlap-using-qgis" target="_blank">https://gis.stackexchange.com/questions/175599/buffer-neighbouring-polygons-without-overlap-using-qgis</a></div><div class="gmail_default"><br></div><div class="gmail_default">but it didn't preserve the inner boundaries like I need. They ended up being wildly different.</div><div class="gmail_default"><br></div><div class="gmail_default">I found a plugin "Buffer without overlaps" and it almost does what I need. It sections off the overlaps as separate polygons (with shrunken versions of the originals) but it consolidates those overlaps as one polygon that overlaps the two original polygons instead of two polygons split by the original border, so I cannot just dissolve them back together with some attribute filter.</div><div class="gmail_default"><br></div><div class="gmail_default"><div class="gmail_default"><br></div><div class="gmail_default">I'm sure there's got to be some combination of buffering, clipping, difference, intersection, union, and dissolve operations that will get me what I need, but I just can't visualise it.</div><div class="gmail_default"><br></div><div class="gmail_default">I just use QGIS for a hobby, so I don't know all the neat computational tricks possible in the GIS field that I could use to do this, so any assistance or guidance on how to accomplish this task would be greatly appreciated.</div><div class="gmail_default"><br></div><div class="gmail_default">Thanks in advance!</div></div></div></div>
<span>_______________________________________________</span><br><span>QGIS-User mailing list</span><br><span>QGIS-User@lists.osgeo.org</span><br><span>List info: https://lists.osgeo.org/mailman/listinfo/qgis-user</span><br><span>Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user</span><br></div></blockquote></div></body></html>