[GRASS-user] mapcalc combining raster and vector

Moritz Lennert mlennert at club.worldonline.be
Wed May 8 06:10:07 PDT 2019


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

> 
> On Wed., May 8, 2019, 08:17 Moritz Lennert, 
> <mlennert at club.worldonline.be <mailto: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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