Re: [ferret_users] Ferret Question: Fill in combination with conset

[Hein Zelle <hein.zelle@xxxxxxxxxxxxx>]

Dear Volker, Ansley,

> You can get some smoothing in to the contours by regridding the data
> to a finer grid.

this is what I usuallyu do with wave data near the coast.  Keep in
mind that you're smoothing data, so you have to be careful that the
data still looks like the original enough.  I typically do either

shade  /lev=(...)  significant_wave_height     ! coarse blocks
fill /over /lev    significant_wave_height     ! overlay smoothed
                                               ! part, doesn't reach coastlines

when that fails, I use scat2gridgauss_xy to regrid the data to a much
finer grid, typically the grid of etopo05 or something similar.  This
has the advantage that you can use scat2grid_gauss to extrapolate
toward the coast a bit, so you don't get so much missing data.

let hs=significant_wave_height
smooth_hs = scat2gridgauss(xsequence(x[g=hs]), \
                           xsequence(y[g=hs]), \
                           xsequence(hs), \
			   x[g=rose], y[g=rose], 0.5, 0.5, 3, 0)

shade smooth_hs
contour /overlay smooth_hs

The resulting contours of a high resolution regrid are typically quite
smooth.  Again, beware of changing the data too much!  You have to
play with the xscale, yscale and cutoff parameters a bit depending on
the data and the target grid.

Kind regards,
     Hein


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Dr. Hein Zelle
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