[GRASS-dev] r.neighbors modification

[Glynn Clements]

Martin Wegmann wrote:

> > > I am looking for a way to  compute r.neighbors for a ring only and not
> > > for the whole 5x5, 7x7 etc. moving window.
> > > It is something like a 7x7 windows but minus the values in the 5x5
> > > windows.
> > >
> > > traditional way:
> > >
> > >  a a a a a
> > >  a b b b a
> > >  a b x b a
> > >  a b b b a
> > >  a a a a a
> > >
> > > ring analysis:
> > >
> > >  a a a a a
> > >  a         a
> > >  a    x    a
> > >  a         a
> > >  a a a a a
> >
> > r.mfilter ?
> 
> that looks good, but as far as I understood it, it is not possible to conduct 
> statistics on this filter (beside divisor), is it?

I don't think that you can compute anything except for sum and mean
using r.mfilter.

-- 
Glynn Clements <glynn at gclements.plus.com>