[GRASS-user] raster pixel value

[Francois Chartier]

I am asking a question on the fundamentals not on a particular example on
how the value within a raster cell is determined when multiple vector data
points are located within a raster cell footprint.
I use RST mostly and sometimes IDW for vector data points.

Le dim. 10 mars 2019 à 10:05, Nikos Alexandris <nik at nikosalexandris.net> a
écrit :

> * Francois Chartier <fra.chartier at gmail.com> [2019-03-10 09:38:13 -0400]:
>
> >Hi
> >
> >i was wondering how the value of a pixel is determined when multiple data
> >points are located within a pixel, for 2d and 3d pixel.  I assume it is
> >based on the interpolation methodology of the raster. is this correct.
> >for large pixels where only data point is located within it, can the pixel
> >have a different value than that of the data point if through the
> >interpolation and due to surrounding points it generates a different
> value?
> >thks
>
> Dear Francois,
>
> your questions are a bit sketchy. What exactly are trying to do?
>
> How the value of a pixel is determined when multiple data points are
> located within a pixel?
>
> Which multiple data points are you referring to?
>
> Multiple raster data cells, which you get when you modify the
> computational region (i.e. when you go from a given spatial resolution
> to a coarser one)?
> Did you try to resample a raster data set and wonder how the new cell's
> value is computed? Which module did you try to use? Which methods?
>
> Vector data points? Which interpolation module did you try?
>
> Nikos
>
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