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<p>Hi Eva,</p>
<p>welcome to the list. You asked a plenty of questions, so it would
be easier to start with some links on the web:</p>
<ul>
<li>Stackoverflow discussion on that:
<a class="moz-txt-link-freetext" href="https://gis.stackexchange.com/questions/60228/generating-dem-from-contour-shapefile-using-qgis">https://gis.stackexchange.com/questions/60228/generating-dem-from-contour-shapefile-using-qgis</a></li>
<li>a GRASS Tutorial:
<a class="moz-txt-link-freetext" href="https://grasswiki.osgeo.org/wiki/Contour_lines_to_DEM">https://grasswiki.osgeo.org/wiki/Contour_lines_to_DEM</a></li>
<li>and a short youtube tutorial:
<a class="moz-txt-link-freetext" href="https://www.youtube.com/watch?v=PhJ77uHlTJA">https://www.youtube.com/watch?v=PhJ77uHlTJA</a></li>
</ul>
<p>Hope this helps</p>
<p>Stefan<br>
</p>
<div class="moz-cite-prefix">Am 03.11.2020 um 14:39 schrieb
<a class="moz-txt-link-abbreviated" href="mailto:fantypus@web.de">fantypus@web.de</a>:<br>
</div>
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cite="mid:trinity-b28ffc1b-7289-4bcf-80db-ab1be53cf0ea-1604410742515@3c-app-webde-bap50">
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<p style="margin-bottom: 13.0px;"><span style="font-size:
11.0pt;"><span style="line-height: 115.0%;"><span
style="font-family: Calibri , sans-serif;">Hi all,</span></span></span></p>
<p style="margin-bottom: 13.0px;"><span style="font-size:
11.0pt;"><span style="line-height: 115.0%;"><span
style="font-family: Calibri , sans-serif;">I have
the following task: </span></span></span></p>
<p style="margin-bottom: 13.0px;"><span style="font-size:
11.0pt;"><span style="line-height: 115.0%;"><span
style="font-family: Calibri , sans-serif;">I need to
create a map with contour lines showing the
thickness of one geological layer/horizon (actually
not the true thickness, but the vertical extent is
required, so if you drill down at one point, what is
the distance between the upper and lower edge of the
horizon). </span></span></span></p>
<p style="margin-bottom: 13.0px;"><span style="font-size:
11.0pt;"><span style="line-height: 115.0%;"><span
style="font-family: Calibri , sans-serif;">The only
data I have are two line features (shape files) of
isolines with elevation values (in m NHN) of each
the upper edge and lower edge of the horizon. </span></span></span></p>
<p style="margin-bottom: 13.0px;"><span style="font-size:
11.0pt;"><span style="line-height: 115.0%;"><span
style="font-family: Calibri , sans-serif;">My
approach would be something like this, but I can’t
figure out how exactly to do it:</span></span></span></p>
<ul>
<li><span style="font-size: 11.0pt;"><span
style="line-height: 115.0%;"><span
style="font-family: Calibri , sans-serif;">Create
a raster from each line feature (did that, but
only the lines are rastered, so would need a
polygon to get a plane? How do that? How can I
include the elevation values of the lines into the
polygon?)</span></span></span></li>
<li><span style="font-size: 11.0pt;"><span
style="line-height: 115.0%;"><span
style="font-family: Calibri , sans-serif;">Interpolate
the elevation values inbetween the isolines to
receive a plane of elevation values (in my opinion
would need a polygon to get a plane, but for
interpolation input Points are needed? And which
interpolation method? Also, some of the isolines
are offset by faults, so need sharp edges in these
areas, how to integrate that in the
interpolation?)</span></span></span></li>
<li><span style="font-size: 11.0pt;"><span
style="line-height: 115.0%;"><span
style="font-family: Calibri , sans-serif;">Then
calculate the vertical distance at each point in
the area between the two planes to get the
thickness (how, which tool does that?)</span></span></span></li>
<li><span style="font-size: 11.0pt;"><span
style="line-height: 115.0%;"><span
style="font-family: Calibri , sans-serif;">Create
a raster showing the thickness throughout the area
in colour range</span></span></span></li>
<li style="margin-bottom: 13.0px;"><span style="font-size:
11.0pt;"><span style="line-height: 115.0%;"><span
style="font-family: Calibri , sans-serif;">Add
contour lines showing the thickness of the horizon</span></span></span></li>
</ul>
<p style="margin-bottom: 13.0px;"><span style="font-size:
11.0pt;"><span style="line-height: 115.0%;"><span
style="font-family: Calibri , sans-serif;">Maybe
there is even a better and probably much simpler way
to do this. However, I am only a beginner in QGIS,
python and statistics. So any help and easy to
understand tips will be very much appreciated. I am
using QGIS 3.10.11 by the way.</span></span></span></p>
<p style="margin-bottom: 13.0px;"><span style="font-size:
11.0pt;"><span style="line-height: 115.0%;"><span
style="font-family: Calibri , sans-serif;">Best
regards,</span></span></span></p>
<p style="margin-bottom: 13.0px;"><span style="font-size:
11.0pt;"><span style="line-height: 115.0%;"><span
style="font-family: Calibri , sans-serif;">Eva</span></span></span></p>
</div>
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<br>
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