[GRASS-user] Removing 0 values from raster map

[Markus Neteler]

On Sat, Aug 22, 2009 at 12:33 AM, stephen sefick<ssefick at gmail.com> wrote:
> I have four maps that I would like to patch together.  The problem is
> that on the boundary there are zero values after patching.  I would
> like to get rid of these values- interpolate the values based on the
> surrounding values.  I can not firgure out how to do this.  Any help
> is greatly appreciated

You could try this:
http://grass.osgeo.org/grass64/manuals/html64_user/r.fillnulls.html

Or r.neighbors with "mode" and a large moving window?

Markus