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GEM offers the possibilities of running global uniform (up to version 4), global YinYang (starting version 4) and limited area (LAM) grids. Have a look at the grid types.
The grid is specified in the file 'gem_settings.nml' in the namelist 'grid'. This GEM grid specification parameters link explains how to define the parameters. Alternatively, see below.
You have to set variables for the
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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'.
grille
The command 'grille' reads the namelist 'grid' from an input file and :
1. creates 3 files with the corresponding tictacs of the:
a) model grid (tape1_model) - this file is needed as input to GenPhysX!!!
b) core grid (tape1_core)
c) free_grid (tape1_free)
2. opens 'xrec' with the domain specified in 'grid' - only if requested - see table below.
These are the keys that can get used with the command:
| key | description |
|---|---|
| -nml | name of namelist file, 'gem_settings.nml' is the default |
| -xrec | open xrec showing the chosen (see '-grid') domain |
| -grid | domain to plot: free, core or model (default) |
| -topo | add topography to tape files |
| -geophy | name of geophys file containing 'ME' and 'MG' used for xrec plot default: ~data/Geophys/geo_801x600 |
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.
In the directory in which you have your file 'gem_settings.nml' simply type :
grille -xrec
This command will open 'xrec' with three fields of your grid:
| LA | : | Latitudes | |
| LO | : | Longitudes | |
| ME | : | Mountain heights |