thanks, i will try it in a little while and let u know. if i understand the principal, then it assumes the point is just further in distance for the interpolation but keeps the value at its original coordinate. to give more weight to a horizontal direction, the z scale needs to be increased vertically and potentially shortened horizonatlly.
On Sat, Mar 16, 2019, 17:47 Benjamin Ducke <[email protected] wrote: > 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 <[email protected] > > <mailto:[email protected]>> 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, > > > > > > _______________________________________________ > > > grass-user mailing list > > > [email protected] <mailto:[email protected]> > > > https://lists.osgeo.org/mailman/listinfo/grass-user > > > > > > > > > > > -- > > Dr. Benjamin Ducke > > Deutsches Archäologisches Institut (DAI) > > Zentrale Berlin, IT-Referat > > > > _______________________________________________ > > grass-user mailing list > > [email protected] <mailto:[email protected]> > > https://lists.osgeo.org/mailman/listinfo/grass-user > > > > > > -- > Dr. Benjamin Ducke > Deutsches Archäologisches Institut (DAI) > Zentrale Berlin, IT-Referat > > _______________________________________________ > grass-user mailing list > [email protected] > https://lists.osgeo.org/mailman/listinfo/grass-user
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