grdfilter gaussian

Hello,

I've a grid file with 3 columns, long, lat and value. The area is
0/360/-70/70 and the resolution is 2 by 2 degrees. As it doesn't look very
pretty (see attachement) I'd like to smooth it by 4 or possibly 5 degrees,
using a Gaussian filter.

The command grdfilter diff_jan96_jul96.grd -Gfiltered_diff_96.grd -D4 (or 5)
-Fg4 -V produces the error message

grdfilter: Input nx,ny = (181 71), output nx,ny = (181 71), filter nx,ny =
(182 1)
grdfilter: Filter type is Gaussian.
grdfilter: Processing output line 70
grdfilter: Unable to estimate value at 4466 nodes, set to NaN.

Any help would be greatly appreciated.

Many thanks,

Rakia

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