Vectors with sigma coordinate

["S. Dobricic" <srdan.dobricic@xxxxxx>]

Hello,

When I use the three-argument vector command to plot velocity on a sigma
coordinate vertical section all vectors are so big that they go out of
the window.  Other plotting commands (shade, fill and contour) work very
well. Does anybody know how to solve this problem?

To scale the vertical coordinate I use a 3D array with heights of data
points. In my case vectors should not be rotated, because they are
formed from horizontal and vertical components of the velocity, but only
positioned according to their height. If vectors are rotated in the new
projection by ferret, it could be helpful to know how is it done. I
could not find this information in the documentation.

Thanks.


I used following commands (u and w are 3D velocity components fields,
and lyr_hgt is the 3D matrix with heights of data points):

set data test.cdf
define grid/x=lon/y=lat/z=level/t=time gg
let ygg = y[g=gg]
set variable/title="Latitude"/unit=degrees_north ygg
fill w[x=15,l=20], ygg, lyr_hgt[x=15]
contour/overlay w[x=15,l=20], ygg, lyr_hgt[x=15]
!!!! The next command gives the wrong plot:
vector/overlay v[x=15,l=20],w[x=15,l=20], ygg, lyr_hgt[x=15]




-- 
Srdjan Dobricic, Joint Research Centre SAI-MEU (TP-690)
Via E.Fermi 1,I-21020 Ispra(Va),Italy
srdan.dobricic@jrc.it,tel:+39-0332-785232,fax:+39-0332-789648