r.fillnulls -help

Description:
  fills NULL (no data areas) in input map and stores filled
  map to a new output map. The fill data are interpolated from
  the no data area boundaries using s.surf.rst.

Usage:
       r.fillnulls input=name output=name


You can use r.contour with low "step" value to check if the
filled area have been smoothly integrated into the existing
data.
The script respects a user mask (MASK) if present.

Markus Neteler 5/2001

