[GRASS-user] mapcalc combining raster and vector

[Francois Chartier]

sure i will send that later.  thks

On Thu., May 9, 2019, 04:00 Micha Silver, <tsvibar at gmail.com> wrote:

>
> On 08/05/2019 16:10, Moritz Lennert wrote:
>
> On 8/05/19 15:03, Francois Chartier wrote:
>
> Hi Micha,
>
> I have soil samples from boreholes where i have data points at every meter
> interval and where soil type changes.  i would like to create a weighted
> average of soil property for lets say the first 1 m below the DEM, so that
> i can evaluate potential for infiltration across a watershed.
>
>
> You can use v.what.rast to read the DEM value into the attribute table of
> your points. Then you can do whatever calculations you need based on that.
>
> Moritz
>
>
> After Moritz's answer, It seems that your question is a data aggregation
> problem. If we can see the actual structure of your data (i.e. v.info -c
> or v.db.select then more specific responses might be possible. Best would
> be a small subset of the actual data.
>
>
>
>
> On Wed., May 8, 2019, 08:17 Moritz Lennert, <mlennert at club.worldonline.be
> <mailto:mlennert at club.worldonline.be> <mlennert at club.worldonline.be>>
> wrote:
>
>     On 8/05/19 14:00, Micha Silver wrote:
>      > You will most likely have to convert the points to raster. But
>     before
>      > that, can you explain what you mean by "located for 10 m from
>     DEM", "10
>      > to 20".
>
>     Or, if you mean zones of equal height, you can transform them to
> vector
>     polygons and use v.vect.stats on these polygons and the points.
>
>     Moritz
>
>      >
>      >
>      > On 08/05/2019 13:31, Francois Chartier wrote:
>      >> Hi
>      >>
>      >> I would like to use mapcalc with types of input a DEM (raster)
>     and xyz
>      >> property (vector).  basically, I would like to do a weighted
>     average
>      >> of data points located for 10 m from DEM, then 10 to 20 etc.
>      >>
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>      >
>      > --
>      > Micha Silver
>      > Ben Gurion Univ.
>      > Sde Boker, Remote Sensing Lab
>      > +972-523-665918
>      >
>      >
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>
>
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> --
> Micha Silver
> Ben Gurion Univ.
> Sde Boker, Remote Sensing Lab
> cell: +972-523-665918
>
>
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