[Qgis-user] Subsurface-Polygons

[chris hermansen]

Lars and list.


On Fri, Dec 12, 2025, 02:24 Uhlmann, Lars via QGIS-User <
qgis-user at lists.osgeo.org> wrote:

> Hi to everyone!
>
> My name is Lars Uhlmann and I am studying Geothermics at the Technical
> University of Munich and at the Friedrich-Alexander University of
> Erlangen-Nürnberg. At the moment I am doing my Master Thesis with the
> topic "Creation of a subsurface model for Erlangen and derivation of
> geothermal potential".
>
> That is why I am writing this email, as I need help with how to display
> the underground model in QGIS.
>
> I believe that it is possible to represent the thermal conductivity of
> the subsurface in subsurface polygons down to a depth of 50 metres. The
> Problem is that I dont know how to do that by myself.
>
> Just a quick addition to give you a better idea of the data basis. I
> have around 400 boreholes in the urban area of Erlangen (80 km²) with
> depths ranging from 1 to 200 metres. These are very well documented
> stratigraphically (in some cases in 1 m increments). I would like to
> connect these layers and then, for example, form a 2D surface of the
> subsoil every 5 metres in order to map the thermal conductivities there.
> The data is available as an Excel file.
> Please feel free to write to me if you need further information.
>

Subsurface data interpolation is often carried out using Kriging and there
is good support for that in QGIS as well as many articles and tutorials
written on the topic.

Try searching for

qgis borehole kriging conductivity

In your favourite search engine.

Note that it's worthwhile spending a bit of your time to understand the
basis of Kriging vs the assumptions you are making about the spatial
distribution of conductivity so that you can defend your use of it.
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