[Qgis-user] basic contouring and kriging

[Nicolas Cadieux]

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
> byron at conjugategeo.com
> Cell:4037108414
>
> _______________________________________________
> Qgis-user mailing list
> Qgis-user at lists.osgeo.org
> List info:https://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe:https://lists.osgeo.org/mailman/listinfo/qgis-user

-- 
Nicolas Cadieux
https://gitlab.com/njacadieux
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20211206/6744d82c/attachment.html>