<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /></head><body style='font-size: 10pt; font-family: Verdana,Geneva,sans-serif'>
<p>Hi Byron</p>
<p>As far as I can tell, you could create a negative sized buffer from the extent of the primary geologic dataset (use square and mitre results, not rounded, for buffering), then clip the primary dataset using the negative buffer to remove the unwanted zero contours.</p>
<p>Cheers.</p>
<div id="signature">---<br />
<div class="pre" style="margin: 0; padding: 0; font-family: monospace">Regards,<br /><br />Nigel Berjak<br />S3 Technologies<br />Geographic Information Systems & Large Format Printing specialists<br />T: +27 33 3423681<br />F: +27 86 6721242<br />E: <a href="mailto:nigel@S3.co.za">nigel@S3.co.za</a><br />Website: <a href="http://www.S3.co.za" target="_blank" rel="noopener noreferrer">http://www.S3.co.za</a><br /><br />Please consider the environment before printing this email.</div>
</div>
<p><br /></p>
<p id="reply-intro">On 2024-05-02 19:07, Byron Veilleux via QGIS-User wrote:</p>
<blockquote type="cite" style="padding: 0 0.4em; border-left: #1010ff 2px solid; margin: 0">
<div id="replybody1">
<div dir="ltr">
<div>i have a large geologic dataset that i want to grid and contour.</div>
<div>There is an irregular zero edge that bounds these data on one side and</div>
<div>a straight bounding area edge on the other sides. If i create an irregular polygon that encloses these data, is there a way to grid and contour such that these data are truncated against the polygon and do not extend beyond?</div>
<span class="v1gmail_signature_prefix">-- </span><br />
<div class="v1gmail_signature" dir="ltr">
<div dir="ltr">Byron Veilleux, MSc. P.Geo
<div>Conjugate Geologic Services Limited</div>
<div>Calgary, Alberta Canada</div>
<div><a href="mailto:byron@conjugategeo.com" rel="noreferrer">byron@conjugategeo.com</a></div>
<div>Cell:4037108414</div>
</div>
</div>
</div>
</div>
<br />
<div class="pre" style="margin: 0; padding: 0; font-family: monospace">_______________________________________________<br />QGIS-User mailing list<br /><a href="mailto:QGIS-User@lists.osgeo.org">QGIS-User@lists.osgeo.org</a><br />List info: <a href="https://lists.osgeo.org/mailman/listinfo/qgis-user" target="_blank" rel="noopener noreferrer">https://lists.osgeo.org/mailman/listinfo/qgis-user</a><br />Unsubscribe: <a href="https://lists.osgeo.org/mailman/listinfo/qgis-user" target="_blank" rel="noopener noreferrer">https://lists.osgeo.org/mailman/listinfo/qgis-user</a></div>
</blockquote>
</body></html>