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Hi,<br>
Also for clarification:<br>
Being a County layer, I would not expect overlapping polygons.<br>
My take is that Tim means "concurrent exterior boundaries" and not "<span
style="font-size:12pt;font-family:"Century Gothic",sans-serif">overlapping
exterior boundaries</span>"<br>
<br>
<b>Tim: </b>What is the reason for wanting only one of the
concurrent(?) boundaries rendered?<br>
Maybe there are other ways to do what you want to.<br>
<br>
HTH,<br>
Zoltan<br>
<br>
<br>
<div class="moz-cite-prefix">On 2024/06/20 07:46, Emma Hain via
QGIS-User wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CACGKw0YUxt4nKC+zD13kfLmbohZ4uN_q=d=idURj0p=UgQWBPw@mail.gmail.com">
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<div>Hi Tim</div>
<div>So let's see if I understand you. </div>
<div>- There are 2 polygon layers (green and black)<br>
</div>
<div>- These polygon layers sometime overlap</div>
<div>- You wish to show only on the pink line in the below image
and not the green overlapping part?<br>
</div>
<div><img src="cid:part1.7BYfzw4G.k1AOv80S@geograph.co.za"
alt="image.png" class="" width="578" height="473"><br>
<br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Thu, 20 Jun 2024 at 11:26,
Tim Malloy via QGIS-User <<a
href="mailto:qgis-user@lists.osgeo.org"
moz-do-not-send="true" class="moz-txt-link-freetext">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">
<div class="msg1254814045772383059">
<div style="overflow-wrap: break-word;" lang="EN-US">
<div class="m_1254814045772383059WordSection1">
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Century Gothic",sans-serif">Fellow
QGIS Users –</span></p>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Century Gothic",sans-serif"> </span></p>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Century Gothic",sans-serif">I’m
trying to determine if its possible to have QGIS
render the exterior boundary of polygon features
only once when that boundary is shared with an
adjacent feature (don’t render overlapping exterior
boundaries for both polygon features).<span>
</span>The data I’m working with is a county parcels
layer and the symbology I’m using for this layer is
a cross hatched line fill with a separate component
for the outline of the polygons.<span>
</span>I’ve tried a couple of expressions (examples
below) including one geometry generator and one data
defined override for the stroke width of the
boundary line but none of them achieves my
objective.<span>
</span>I’m using QGIS <span
class="m_1254814045772383059GramE">3.34.7</span>
and my coding skills are limited.<span>
</span>I feel like I’ve seen this issue covered
somewhere but have been unable to find a solution
after extensive online exploration.<span>
</span></span></p>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Century Gothic",sans-serif"> </span></p>
<p class="MsoNormal" style="text-indent:0.5in"><b><span
style="font-size:12pt;font-family:"Century Gothic",sans-serif">Method
#1:<span>
</span>“</span></b><span
style="font-size:12pt;font-family:"Century Gothic",sans-serif">boundary(
difference( $geometry, aggregate( 'union',
'intersects', $geometry, other_layer := @layer)))”<span>
</span>This expression was used on the outline
component of the symbology described above.<span>
</span></span></p>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Century Gothic",sans-serif"> </span></p>
<p class="MsoNormal" style="margin-left:1in"><b><span
style="font-size:12pt;font-family:"Century Gothic",sans-serif">Method
#2:<span>
</span></span></b><span
style="font-size:12pt;font-family:"Century Gothic",sans-serif">“CASE
WHEN intersects( $geometry, geom_to_wkt( boundary(
$geometry ))) THEN 0
<span> </span>ELSE 1 END”<span>
</span>Here I switched to using an expression on the
stroke width of a simple fill, but I got an error
message
<span class="m_1254814045772383059GramE">saying</span>
“Cannot convert to geometry”.<span>
</span></span></p>
<p class="MsoNormal" style="margin-left:1in"><span
style="font-size:12pt;font-family:"Century Gothic",sans-serif"> </span></p>
<p class="MsoNormal" style="margin-left:1in"><span
style="font-size:12pt;font-family:"Century Gothic",sans-serif">Any
input would be greatly appreciated.</span></p>
<p class="MsoNormal" style="margin-left:1in"><span
style="font-size:12pt;font-family:"Century Gothic",sans-serif"> </span></p>
<p class="MsoNormal" style="margin-left:1in"><span
style="font-size:12pt;font-family:"Century Gothic",sans-serif">Tim</span></p>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Century Gothic",sans-serif"> </span></p>
<p class="MsoNormal"><span
style="font-size:12pt;font-family:"Century Gothic",sans-serif"> </span></p>
</div>
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<div
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<br>
<pre class="moz-signature" cols="72">--
=============================================
Zoltan Szecsei GPrGISc 0031
Director, Geograph (Pty) Ltd.
GIS and Photogrammetric Services
Cape Town, South Africa.
Mobile: +27-83-6004028 (Signal, not WhatsApp)
+974-5058-8729
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=============================================</pre>
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