[GRASSLIST:3304] Re: how to interpolate a raster?
mihastaut at hotmail.com
Thu Apr 29 08:44:41 EDT 2004
>leo.lami at katamail.com wrote:
> > I'd like to smooth or interpolate a raster but I don't know how to do
> > I tried with r.surf.idw but the result is not good for me.
> > Are there other metods more flexible?
>One alternative is to convert the raster to a sites file with
>r.to.sites then use s.surf.rst.
>Glynn Clements <glynn.clements at virgin.net>
Would you like to smooth an already done raster which is not very smooth
without changing the resolution or with changing the resolution or would you
like to interpolate a set of point (sites) data to get an estimation of the
values between them?
In the first case you can use r.mfilter or r.mapcalc's neighborhood
modifier. As far as I know r.mfilter does not handle floating point values.
In the second and third case just follow Glynn's suggestion. Or for a more
in depth analysis you can use Gstat or R's geostatistic and spatial
MSN 8 helps eliminate e-mail viruses. Get 2 months FREE*.
More information about the grass-user