<div dir="ltr"><div dir="ltr">Dear David, good afternoon,<div><br></div><div>This mailing list is not for support. You need to write to the users mailing list<br><br><a href="https://qgis.org/resources/support/#communication-channels">https://qgis.org/resources/support/#communication-channels</a><br><br>or look for community support using one of the other communication channels:<br><br><a href="https://qgis.org/resources/support/#communication-channels">https://qgis.org/resources/support/#communication-channels</a><br><br>You may also want to consider getting some commercial support:<br><br><a href="https://qgis.org/resources/support/commercial-support/">https://qgis.org/resources/support/commercial-support/</a><br><br>there are  plenty of companies around that can help you in a professional and timely manner.<br><br>With regards</div><div><br></div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Sat, Jul 19, 2025 at 3:27 PM David Brownrigg via QGIS-PSC <<a href="mailto:qgis-psc@lists.osgeo.org">qgis-psc@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="msg-6918901394434411289">




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I have a dsm made by WebODM from a drone image set with inaccurate gps.</div>
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Contours made from the dsm have a +45cm error compared to known vales.</div>
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In Raster->extract->contour I tried setting 'Set offset from zero' to -0.45</div>
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BUT resulting contours have the same numerical values as before.</div>
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What should I be doing (e,g for a contour labelled 10.50 to be labelled 10.05 in my case)?</div>
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Thanks in advance for any help.</div>
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David</div>
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</div></blockquote></div><div><br clear="all"></div><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div>Giovanni Manghi</div><a href="http://naturalgis.pt/" target="_blank">https://naturalgis.pt/</a><br><a href="mailto:giovanni.manghi@naturalgis.pt" target="_blank">giovanni.manghi@naturalgis.pt</a><br>* QGIS/PostGIS Training<br>* QGIS Support and Consulting<br><div><img src="https://www.naturalgis.pt/images/naturalgis_small_signature.png"><br></div>--</div></div></div>
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