[GRASS-user] Anisotropy

[Benjamin Ducke]

On 16/03/2019 21:24, Francois Chartier wrote:
> I thought Zscale was used to convert units ft to m, i didnt know it was
> for giving more weight to one direction.

That's only one application case. The manual page
goes on:

'Rescaling of z-coordinates (zscale) is also needed when the distances
in vertical direction are much smaller than the horizontal distances ..'

That is equivalent to what you are looking
for: instead of assuming that a process works
slower or faster in the Z direction (anisotropy),
you could also assume the speed is the same but
the Z distance is shorter/longer, no?

If I understand the manual page correctly, then
'zscale' only rescales Z values during
interpolation, but the original coordinates are
preserved in the voxel output.

Why not just experiment and check if it produces
a useful result?

Cheers,

Ben

> 
> Le sam. 16 mars 2019 à 15:20, Benjamin Ducke <benducke at fastmail.fm
> <mailto:benducke at fastmail.fm>> a écrit :
> 
>     On 16/03/2019 19:51, Francois Chartier wrote:
>     > Hi, 
>     >
>     > Is it possible to add anisotropy when conducting interpolation for 3D
>     > raster.  I would like to give more weight horizontally than vertically
>     > in the 3D interpolation process. 
> 
>     'v.vol.rst' has an option 'zscale'.
>     Is that not what you are looking for?
> 
>     Best,
> 
>     Benjamin
> 
>     >
>     > thanks,
>     >
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> 
> 
>     -- 
>     Dr. Benjamin Ducke
>     Deutsches Archäologisches Institut (DAI)
>     Zentrale Berlin, IT-Referat
> 
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-- 
Dr. Benjamin Ducke
Deutsches Archäologisches Institut (DAI)
Zentrale Berlin, IT-Referat