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Click here to find out how to set blending and pilot area (halo).
FFT criteria
To fulfill the FFT criteria the number of grid points in x-direction, excluding the pilot zone, must be a multiple of 2, 3, and 5. Use the findfft GEMCLIM script to find the possible numbers of grid points fulfilling the FFT criteria.
Again you need to insure that the model environment is set.
Then you can use findfft:
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This command will then print all "good" values you can use for 'Grd_ni' and 'Grd_nj' (can be different) between the range you specified with 'min' and 'max'.
Verify your grid
After having specified a grid in the file 'gem_settings.nml' you can have a look at the grid you specified using the grille script - see description below.
In the directory in which you have your file 'gem_settings.nml' simply type :
grille -xrec
or if you just want to see the free grid:
grille -xrec -grid free
grille
The command 'grille' reads the namelist 'grid' from an input file and :
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