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The specific details of how the transformation ( from spectral T255 to 0.25x0.25 lat-lon grid point for example) or regridding ( from reduced Gaussian N128
to 0.25x0.25 lat-lon grid point ) can be found in the EMOSLIB reference guide:
https://software.ecmwf.int/wiki/display/EMOS/Reference+Guide
In particular, the sections on Transformations (including any automatic truncation) and Grid point to Grid point Interpolation. The sections on
Land-Sea Masks and Precipitation also give Meteorological Interpolation and Regridding (MIR) reference page: MARS interpolation with MIR, under the section on Spectral to grid point transformations.
The section Highlights and main differences gives information about "special" processing which is done for some parameters.and the differences between EMOSLIB and MIR for a number of representative parameters.
See the related article in the ECMWF newsletter no.152 for a more complete description of MIR library.
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