Hi,
Krigging functions are part of the SAGA Algorithms. If you do not see
SAGA in the processing toolbox, then you probably need to activate the
provider. Activate the toolbox, go to the processing options (the
wrench), Processing, Providers. You may want to install the the
Processing Saga Next Gen Provider plugin instead.
I don't know how they go from the tin to the raster. I imagine they use
the nearest neighbor.
Nicolas
On 2021-12-09 4:57 p.m., Firstname Lastname wrote:
Thanks for the information above, it was very helpful and i now have a
better understanding of the interpolation process.
As a follow up question, i could not find the krigging function in the
processing toolbox, only TIN and IDW. where do i look for the
krigging interpolation
Also, i understand the construction of delawney triangles and veronoi
diagrams now and how the veronoi cells are constructed. What i am not
clear on is, once you have completed the interpolation and you have
your delawney triangle boundaries, how does this get translated to at
regular grid.
the triangular mesh is irregular, how does this get referred to a
rectangular grid? if you have a brief description, that is adequate.
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On Mon, Dec 6, 2021 at 2:51 PM Nicolas Cadieux
<njacadieux.git...@gmail.com> wrote:
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
by...@conjugategeo.com
Cell:4037108414
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--
Nicolas Cadieux
https://gitlab.com/njacadieux
--
Nicolas Cadieux
https://gitlab.com/njacadieux
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