Hi,
It's not clear to me what grid goes with what variable in your
script. Showing us the output of commands like "show data", "show
grid g" and "show grid grid_0001", would help. Does Ferret issue
any messages about the grid as your script runs? If yy is from one
grid and ssh is on another grid, then when it evaluates the
expressions ug and vg, Ferret has to to reconcile the grids. If you
want the vector components to be on a different grid from what they
are, you could define the variables differently or regrid them to
the desired grid.
-Ansley
On 11/8/2011 2:56 AM, Mahesh Shinde wrote:
Dear friends,
I am computing geostropic currents using Aviso altimetry. it plots
the currents, please see the figure below....
here I am also attaching the script .....
the ferret script ...
can data/all
can viewport
use dt_ref_med_merged_madt_h_20090610_20090610_20100602.nc
!(aviso ssh)
let g=9.8
let pi=3.141
let omega = 0.729e-4
let yy = y[g=GLZ2] !( please note that this 'GLZ2' is coming from
ferret
let f=2.0*omega*sin(yy*pi/180.0)
let ssh=GRID_0001
let ug = -1.0*(g/f)*ssh[y=@ddc] !(centered difference scheme is
used)
let vg = (g/f)*ssh[x=@ddc]!(centered difference scheme is used)
!plot geostropic winds
vec/l=1/xskip=4/yskip=4/nolab ug,vg
go land
!-------------------------------------------------------------------------------------------------------------
please tell why currents are looks like.....
thanks
regards
mahesh
--
----------------------------------------------------------------------------------------------------------------------
(Permanent Affiliaiton)
Mr. Mahesh Shinde
Climate and Global
Modeling Division,
Indian Institute of
Tropical Meteorology,
NCL POST, Dr. Homi
Bhabha Road,
Pashan, Pune-411008,
INDIA
email: samurai@xxxxxxxxxxxxxx
cell: +91-9822050959
skype : mashinde2k9
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