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There are several programs distributed with OpenIFS that can be useful in working with the grids used by the model. These are documented here.
All these programs except for 'gaussgr' are compiled executables, build when the OpenIFS model is compiled. By default, after compilatoin, they can be found in the 'make' directory in the build sub-directory pointed to by the OIFS_COMP & OIFS_BUILD environment variables. e.g. for OIFS_COMP=gnu, OIFS_BUILD=opt, the compiled executables are found in 'make/gnu-opt/oifs/bin'.
Number of latitudes in a grid: gaussgr
The command 'gaussgr' returns the number of latitudes between the pole and the equator for a given input resolution and grid type. It is a bash script and can be found in the 'bin' directory of the OpenIFS distribution.
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% gaussgr -h |
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% gaussgr -r 95 -g _4
96 |
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% gaussgr -r 511 -g l_2
256 |
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For grid types, see 4.3 OpenIFS: Horizontal Resolution Configurations |
Get resolution of files: getres
rgrid
grib_set_vtable
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