<br><font size=2 face="sans-serif">The GrADS documentation provides the
method for the 9-point smoothing in the SMTH9 function. However, for 1-D
data, it only says "</font><font size=3>If the gridded data is 1-Dimensional,
the result is a 3 point smoothing." Can any user tell me what the
specific method is? It does not appear to be a straight 3-point average,
but some weighted average. I've tried various combinations but haven't
been able to duplicate the GrADS result.</font><br><br><font size=3>I'm using SMTH9 within a GR2STN expression in a 2-D (lon-lat)
field; x, y, and t are fixed for each time step. Sample script expression:</font><br><br><font size=3>'d gr2stn(1.8*smth9('var')-459.69,'lon','lat')'</font><br><br><font size=3>I get a different result if I first re-define the variable
as a smoothed field (using smth9), and then run the expression without
smth9. In this case, the result equals the 9-point smoothing I would expect.
Why the difference?</font><br><br><font size=3>I'm using version 1.9.0-rc1 (from OpenGrADS) for Windows,
run on a Windows XP platform.</font><br><br><font size=3>Stephen McMillan</font><BR>
<BR>
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