<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body dir="auto"><div dir="auto">Hi Byron</div><div dir="auto"><br></div><div dir="auto">The answer is yes. Create your 2 grids using the vector to radtor tools within qgis or saga and then use grid calculator to obtain the difference between the two.</div><div dir="auto"><br></div><div dir="auto">Kirk Schmidt</div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><br></div><div id="composer_signature" dir="auto"><div style="font-size:12px;color:#575757" dir="auto">Sent from my Galaxy</div></div><div dir="auto"><br></div><div><br></div><div align="left" dir="auto" style="font-size:100%;color:#000000"><div>-------- Original message --------</div><div>From: Emma Hain via QGIS-User <qgis-user@lists.osgeo.org> </div><div>Date: 2024-11-20 12:15 a.m. (GMT-04:00) </div><div>To: Byron Veilleux <byron@conjugategeo.com> </div><div>Cc: qgis-user@lists.osgeo.org </div><div>Subject: Re: [Qgis-user] volume calculation workflow. </div><div><br></div></div><div dir="ltr"><div>Does this help?</div><div><a href="https://qgis-in-mineral-exploration.readthedocs.io/en/latest/source/geological_data/grid_layout.html">https://qgis-in-mineral-exploration.readthedocs.io/en/latest/source/geological_data/grid_layout.html</a></div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div class="gmail_attr" dir="ltr">On Tue, 12 Nov 2024 at 11:15, Byron Veilleux via QGIS-User <<a href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a>> wrote:<br></div><blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex" class="gmail_quote"><div dir="ltr"><div>i have a shapefile with elevation values as digitized contours, for the same surface, i have well data elevation points for this same surface. </div><div>is it possible in QGIS to use the contours and well points to create a grid?</div><div>once i have created grids (actually two surfaces), is there a way to subtract these grids and calculate the volume between these surfaces?</div><div>is there a tutorial for grid operations such as subtracting one grid from another to calculate volumes and multiply grids together or using constant values</div><div>thank you</div><div><br></div><span class="gmail_signature_prefix">-- </span><br><div class="gmail_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">byron@conjugategeo.com</a></div><div>Cell:4037108414</div></div></div></div>
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</blockquote></div><div><br clear="all"></div><br><span class="gmail_signature_prefix">-- </span><br><div class="gmail_signature" dir="ltr"><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>
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