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<p>Hi Mike:</p>
<p>I usually convert the contours or breaklines into a point layer
and then generate a dem from that. This is not a precise
methodology but it would depend on what you are trying to do and
the precision of the underlying data.</p>
<p>Kirk Schmidt <br>
</p>
<div class="moz-cite-prefix">On 12/18/2020 5:28 AM, Michael Dufty
wrote:<br>
</div>
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<p class="MsoNormal"><span>The links for Nicolas are quite
useful, but I think to create a raster DEM from vector lines
you probably need to use the interpolate triangulation with
breaklines or structure lines.
</span></p>
<p class="MsoNormal"><span>The dialogue takes a bit of getting
used to, you need to choose the layer the data will come
from, click + then in the box below choose whether the layer
is being used for points, breaklines or structure lines.</span></p>
<p class="MsoNormal"><span> </span></p>
<p class="MsoNormal"><span>I’ve had major issues with the
interpolation crashing QGIS if I try to used it with
breaklines for complex imported data, but it seems to work
OK for simple test geometries, and may be good for a simple
excavation.</span></p>
<p class="MsoNormal"><span> </span></p>
<p class="MsoNormal"><span>I’d be interested to know if anyone
has had success with interpolation using breaklines for more
complex data, I’ve had to resort to other software trying to
import DEM supplied as dxf 3d faces, but maybe I’m missing a
basic step like fixing geometry or removing duplicates.</span></p>
<p class="MsoNormal"><span> </span></p>
<div>
<div>
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span
lang="EN-US"> Qgis-user
<a class="moz-txt-link-rfc2396E" href="mailto:qgis-user-bounces@lists.osgeo.org"><qgis-user-bounces@lists.osgeo.org></a>
<b>On Behalf Of </b>Nicolas Cadieux<br>
<b>Sent:</b> Friday, 18 December 2020 12:04 AM<br>
<b>To:</b> Abhi Shek <a class="moz-txt-link-rfc2396E" href="mailto:psn.abhishek@gmail.com"><psn.abhishek@gmail.com></a><br>
<b>Cc:</b> <a class="moz-txt-link-abbreviated" href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a><br>
<b>Subject:</b> Re: [Qgis-user] Volume calculation - Reg</span></p>
</div>
</div>
<p class="MsoNormal"> </p>
<p class="MsoNormal">This should help</p>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal"><a href="https://youtu.be/EerXfUf-aHo"
moz-do-not-send="true">https://youtu.be/EerXfUf-aHo</a></p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal"><a
href="https://www.pointsnorthgis.ca/blog/how-to-calculate-surfacecut-volume-qgis-advanced/"
moz-do-not-send="true">https://www.pointsnorthgis.ca/blog/how-to-calculate-surfacecut-volume-qgis-advanced/</a></p>
<div>
<p class="MsoNormal">Nicolas Cadieux</p>
<div>
<p class="MsoNormal"><a
href="https://gitlab.com/njacadieux"
moz-do-not-send="true">https://gitlab.com/njacadieux</a></p>
</div>
</div>
<div>
<p class="MsoNormal"><br>
<br>
</p>
<blockquote>
<p class="MsoNormal">Le 17 déc. 2020 à 04:57, Abhi Shek
<<a href="mailto:psn.abhishek@gmail.com"
moz-do-not-send="true">psn.abhishek@gmail.com</a>>
a écrit :</p>
</blockquote>
</div>
<blockquote>
<div>
<p class="MsoNormal"></p>
<div>
<p class="MsoNormal">Sir,</p>
<div>
<p class="MsoNormal">I invite your kind attention
to the above subject. I am a beginner in qgis.</p>
</div>
<div>
<p class="MsoNormal">I want to create a raster DEM
using Vector Lines. </p>
</div>
<div>
<p class="MsoNormal">In a nutshell, I want to
calculate the planned excavated volume. </p>
</div>
<div>
<p class="MsoNormal">please guide me in this matter.</p>
</div>
<div>
<div>
<div>
<p class="MsoNormal"> </p>
</div>
<p class="MsoNormal">-- </p>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<p class="MsoNormal"><span>with warm
regards,</span><br>
<span>P S N Abhishek,</span></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<p class="MsoNormal">_______________________________________________<br>
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<pre class="moz-signature" cols="72">--
Kirk Schmidt, MScF, BScF, RPF
General Manager
Nortek Resource Solutions Inc.
RR # 1
Thorburn, NS
B0K 1W0
Tel (902) 922.3607
Email: <a class="moz-txt-link-abbreviated" href="mailto:kirk@nortekresources.com">kirk@nortekresources.com</a>
Web: <a class="moz-txt-link-abbreviated" href="http://www.nortekresources.com">www.nortekresources.com</a></pre>
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