[GRASS-user] Grass 7 and 7.1 r.surf.idw problem

[Markus Neteler]

On Thu, May 7, 2015 at 12:28 PM, Robert Kuszinger <kuszinger at giscom.hu> wrote:
> (I'm sorry for the previous one going out without subject)
>
> Hello,
>
> I've tried to use r.surf.idw on a large raster. It works well in 6.4.4.
>
> I've moved to 7.1 SVN, where everything is marvellous, at least what I use,
> except r.surf.idw which creates the same output as the impot was.
> I've also svn-ed and compiled 7.0.1, where r.surf.idw did the same.

There are two issues open:
https://trac.osgeo.org/grass/query?status=!closed&keywords=~r.surf.idw

> Namely:
>
> r.surf.idw --overwrite --verbose input=output_temp1 output=output_temp2
> npoints=7
>
> when finished, output_temp2 is the same as output_temp1 and no interpolation
> seems to be done.
>
> One more big difference:
> 6.4.4 uses less than 2G ram and finishes in a few minutes. In 7.0 and 7.1 it
> eats all 6GB RAM, 4 GB SWAP and runs much-much longer, understandably...

This is kind of surprising. Are you sure that the computation region
was really the same (extent + resolution)?
Could you provide us with a reproducible example?

> Should I stay with 6.4.4?

Likely not :-)

Markus