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<p>Hi,</p>
<p>Open the Processing toolbox panel, search for 'Krigging'. You
will see multiple SAGA modules. If you search for "interpolation",
you will find IDW AND TIN under Q modules and other methods under
the SAGA module. If you search for "grid" you will find multiple
algorithms under GDAL/Raster analysis. See
<a class="moz-txt-link-freetext" href="https://gdal.org/tutorials/gdal_grid_tut.html#gdal-grid-tut">https://gdal.org/tutorials/gdal_grid_tut.html#gdal-grid-tut</a> and
<a class="moz-txt-link-freetext" href="https://gdal.org/programs/gdal_grid.html">https://gdal.org/programs/gdal_grid.html</a> for other methods. This
should cover it.</p>
<p>The idea is generally to interpolate a raster surface from points
or lines containing a z field or a z value (in 3D files). After,
you use Raster/Extract/Contour on this new raster layer. You can
also install the contour plugin. That uses a point file only but
I don't know the what algorithm it uses.<br>
</p>
<p>You may find more algorithm using CrimeStat or GeoDa softwares.<br>
</p>
<p>Hope this helps.</p>
<p><br>
</p>
<p>Nicolas<br>
</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 2021-12-06 1:59 p.m., Firstname
Lastname wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAAyYZQJE9WthL6j6k6XjRfJ4nDCCokcK-5Dn1nTRHBxDGvk1Dw@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">hello group:
<div>i want to demonstrate some of the pitfalls of computer
contouring methods with limited datasets. i wanted to use a
small dataset to demonstrate several contouring algorithms.
In particular, linear interpolation, inverse weighted, nearest
neighbour and kriging. Are any of these built into QGIS? i
do not see any options to control the contouring in the
plugins for any options other than the default. </div>
<div>thank you if you can provide any help.<br clear="all">
<div><br>
</div>
-- <br>
<div dir="ltr" class="gmail_signature"
data-smartmail="gmail_signature">
<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"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">byron@conjugategeo.com</a></div>
<div>Cell:4037108414</div>
</div>
</div>
</div>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
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<pre class="moz-signature" cols="72">--
Nicolas Cadieux
<a class="moz-txt-link-freetext" href="https://gitlab.com/njacadieux">https://gitlab.com/njacadieux</a></pre>
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