[Qgis-user] qgis - run interpolation on table and selected attribute

[Francois Chartier]

thanks, for the interpolation, is there a way to increase the number of
nodes. i tried inverse distance and nearest neighbour.  can we set it at
for ex a node every 10 m?
i also created a voronoi mesh and based on delaunay triangle.  one the grid
is built, can we interpolate the data on these nodes?   one application
would be : a data set of concentrations at certain locations and we want to
know what is the interpolated value at a given property line, road,
structure etc?
cheers
f

On Sat, Oct 27, 2018, 18:20 Nicolas Cadieux, <nicolas.cadieux at archeotec.ca>
wrote:

> Hi,
> You can easily make a query then when you save the file, you can specify
> that you wish to save only the selected points.
>
> You may have some difficulty with the interpolation.  I suggest you use
> gdalDem or Saga for this interpolation. Nearest neighbor will be the
> fastest interpolation method. If you can handle that may points or have
> thousands of files to deal with (LiDAR), contact me again.  Csv files,
> Python scripting and GDAL will be useful in those situations.  Cloud
> Compare will also excel at dealing with so many points.
>
> Nicolas
>
> > Le 27 oct. 2018 à 17:57, Francois Chartier <fra.chartier at gmail.com> a
> écrit :
> >
> > Hi,
> >
> > I have a large data set 180k points consisting of XYZ and attribute, and
> i would like to interpolate the attribute at certain elevations only.
> > i have created separate tables for the given elevations outside of qgis
> and then imported it and interpolate.
> > I think that one should be able to run a query and interpolate values
> based on the query result, or create a new data set, export query result
> into a new table in qgis, and then interpolate.  Is this possible?
> >
> > Thanks,
> > F
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