folded grids in FERRET

[Arne Biastoch <abiastoch@xxxxxxxxxxxxxxx>]

Hi Ferreters,

here's a question to all modelers who work with folded grids and FERRET.
The origional topography in my model is like this example:

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxx.................................xxxxxxxxxxxx
xxxxxxxxxxx........................................xxxxx
xxxxxxxxxxxx......xxxxxxxxxxxx.....................xxxxx
xxxxxxxxxxxxx....xxxxxxxxxxxx...............xxxxxxxxxxxx
xxxxxxxxxxxx.......xxxxxxxx..................xxxxxxxxxxx
xxxxxxxxxxx.........xxxxxxxx...............xxxxxxxxxxxxx
xxxxxxxxxxx...........xxxx...................xxxxxxxxxxx
xxx..................xxxxx...................xxxxxxxxxxx
x.....................xxx...................xxxxxxxxxxxx
x....................xx....................xxxxxxxxxxxxx
xx....xx............xxxxx...................xxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

1   5   10   15   20   25   30   35   40   45   50   55


For computational reasons the southwestern bight is mapped on the land
corner in the southeast. So the grid is folded and looks like this:


          xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
          x.................................xxxxxxxxxxxx
          x........................................xxxxx
          xx......xxxxxxxxxxxx.....................xxxxx
          xxx....xxxxxxxxxxxx...............xxxxxxxxxxxx
          xx.......xxxxxxxx..................xxxxxxxxxxx
          x.........xxxxxxxx...............xxxxxxxxxxxxx
          x...........xxxx...................xxxxxxxxxxx
          ...........xxxxx...................xxxx.......
          ............xxx...................xxx.........
          ...........xx....................xxxx.........
          ..........xxxxx...................xxxx....xx..
          xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

             15   20   25   30   35   40   45   50   55  (original)
          1   5   10   15   20   25   30   35   40   45  (folded)


All files (NetCDF) that are produced by the model contain therefore the
folded version. But for analyzing and plotting it would be nice to convert
to the unfolded fields.

Does anyone has a tip or a solution for FERRET routine that unfolds this
grid? I think the problem is not only to map the southeastern corner back
to the southwestern but also the different sizes of the fields.

Ciao,
	Arne 

______________________________________________________________________________

  Arne Biastoch
                                        
  Institut fuer Meereskunde             phone: 49-431-597 3804 
  Dept. Theoretical Oceanography        fax  : 49-431-565876 
  Duesternbrooker Weg 20                email: abiastoch@ifm.uni-kiel.de
  24105 Kiel, Germany                  
           
  Internet: http://www.ifm.uni-kiel.de/to/data/pers/abiastoch.html
______________________________________________________________________________