<div dir="ltr"><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:ii_lxms3im20" alt="image.png" 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">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">
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<p class="MsoNormal"><span style="font-size:12pt;font-family:"Century Gothic",sans-serif">Fellow QGIS Users –<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:"Century Gothic",sans-serif"><u></u> <u></u></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><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:"Century Gothic",sans-serif"><u></u> <u></u></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><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:"Century Gothic",sans-serif"><u></u> <u></u></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><u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:1in"><span style="font-size:12pt;font-family:"Century Gothic",sans-serif"><u></u> <u></u></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.<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:1in"><span style="font-size:12pt;font-family:"Century Gothic",sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal" style="margin-left:1in"><span style="font-size:12pt;font-family:"Century Gothic",sans-serif">Tim<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:"Century Gothic",sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:"Century Gothic",sans-serif"><u></u> <u></u></span></p>
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</div></blockquote></div><br clear="all"><br><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div style="margin-bottom:20px;font-family:verdana,sans-serif;color:rgb(68,68,68)">Emma Hain — Product Manager/Senior GIS Analyst<br>
<a href="mailto:emma@north-road.com" style="color:rgb(78,141,175);text-decoration:none" target="_blank">emma@north-road.com</a> <br></div>
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