Hi,
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
https://gdal.org/tutorials/gdal_grid_tut.html#gdal-grid-tut and
https://gdal.org/programs/gdal_grid.html for other methods. This should
cover it.
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.
You may find more algorithm using CrimeStat or GeoDa softwares.
Hope this helps.
Nicolas
On 2021-12-06 1:59 p.m., Firstname Lastname wrote:
hello group:
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.
thank you if you can provide any help.
--
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
[email protected]
Cell:4037108414
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--
Nicolas Cadieux
https://gitlab.com/njacadieux
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