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<p>Dear Patrick,</p>
<p>If you have Qgis with GRASS you can use r.geomorphon.</p>
<p><a
href="https://grass.osgeo.org/grass76/manuals/addons/r.geomorphon.html">https://grass.osgeo.org/grass76/manuals/addons/r.geomorphon.html</a></p>
<p>I just ran a test in a DEM in QGIS 3.10 and GRASS 7.6 and it
worked perfectly. <br>
</p>
<p>The image presents the geomorphons estimated:<br>
</p>
<p><img
src="https://grass.osgeo.org/grass76/manuals/addons/legend.png"></p>
<p>source: grass 7.6 manual.</p>
<p>The resulting maps looks like this:</p>
<p><img src="cid:part3.F1F4169F.0BD190C2@gmail.com" alt=""><img
src="cid:part4.4E997874.8ECEE30D@gmail.com" alt=""></p>
<p><br>
</p>
<p>Hope this helps.</p>
<p>Jonathan.<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">El 31/10/2019 a las 02:52, Patrick Marx
escribió:<br>
</div>
<blockquote type="cite"
cite="mid:13D80AB8399BFAAE.4c1e6599-0f8a-4b1d-94a3-666c41c1a608@mail.outlook.com">
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<div dir="ltr" text-align="left">
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<div dir="ltr" text-align="left">
<div style="color: rgb(33, 33, 33); background-color:
rgb(255, 255, 255); text-align: left;" dir="ltr">Hi all, </div>
<div style="color: rgb(33, 33, 33); background-color:
rgb(255, 255, 255); text-align: left;" dir="ltr">I would
like to find the contour line in a dem at the inflection
point of the slope. I mean, I would like to know at which
height the terrain is changing from convex to concave. I
found plugins which calculate if a specific cell is convex
or concave in relation to its neighbours in a 3 x 3
raster. But I would like to know it for a specific
terrain.</div>
<div style="color: rgb(33, 33, 33); background-color:
rgb(255, 255, 255); text-align: left;" dir="ltr">Does
anyone has an idea?</div>
</div>
<div id="ms-outlook-mobile-signature">
<div dir="ltr" style="text-align: left;">Regards Patrick</div>
</div>
</div>
</div>
<br>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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<pre class="moz-signature" cols="72">--
Ing. Jonathan Agüero Valverde, Ph.D.
Profesor e Investigador
Programa de Investigación en Desarrollo Urbano Sostenible (ProDUS)
Escuela de Ingeniería Civil
Universidad de Costa Rica
Tel: (506) 2511-2787, 2511-2777
<a class="moz-txt-link-abbreviated" href="mailto:jonathan.aguero@ucr.ac.cr">jonathan.aguero@ucr.ac.cr</a>
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