[ferret_users] Plotting wind data on cylindrical grid

["Stephen R. Guimond" <guimond@xxxxxxxxxxxxx>]

Ferreters,
  Questions:
(1) I have interpolated a regular lat/lon grid with resolution of 1.125 
deg to a cylindrical grid (dradius = 100km, dazimuth = 5 deg, dpressure 
= 50 hPa) and want to now plot the wind vectors on this grid.  I am 
aware of ways to plot scattered point data, but was wondering if the 
3-arguement vector command for curvilinear coordinates would work in my 
case.  Would I do something like this?:

vector u,v,lon[i=1:100]+0*lat[j=1:100],lat[j=1:100]+0*lon[i=1:100]

where the u and v are two dimensional in x,y.  The problem is, the grid 
spacings in lat/lon for my data are not on a regular lat/lon grid.  
Maybe there is a way to do a cylindrical map projection or something 
that would allow me to use the vector command?  (2) I used a bi-linear 
interpolation scheme to grid the ECMWF(1.125 deg) grid to my new 
cylindrical grid.  Could I have done this same thing in FERRET with the 
SAMPLEXY function with just the lat/lon values of my new grid and the 
variable from the model?  (3)  On the SCAT2GRIDGAUSS function:  how 
does increasing/decreasing xscale and yscale affect the output of the 
gridded data?  How should I choose these values and the cutoff?


Thanks for any help!

Steve =======================================================
Stephen R. Guimond
Graduate Research Assistant
Center for Ocean-Atmospheric Prediction Studies (COAPS)
Tallahassee, FL 32304
=======================================================

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