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No, all existing valid MARS requests will also work when using MIR. Some new keywords have been will be introduced for new features such as:
- The usage of an intermediate grid when transforming from Spectral Harmonics to lat-lon grids,
- Custom Land-Sea Mask processing.
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Will I get different results?
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By default, MIR does not use land-sea mask processing for any parameters. However, users can will be able to specify the land-sea mask to use LSM processing for both input and output grids .TODO: describe the new MARS keyword once it has been agreedwith a new set of MARS keywords.
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Note that as a consequence, MIR does not apply land-sea mask processing when using the nearest neighbour method, which was the case in EMOSLIB. |
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| Path | Keywords | MIR Behaviour | EMOSLIB Behaviour |
|---|---|---|---|
| Red | RESOL=AUTO, GRID=1.0/1.0 | Default Behaviour. Transformation from T1279 to an intermediate F90 full (regular) Gaussian grid (with an automatic truncation to T179) followed by a grid-to-grid interpolation from the F90 grid to 1.0/1.0. | Default Behaviour. Direct transformation from T1279 to 1.0/1.0, with an automatic truncation to T213 according to EMOSLIB's truncation table |
| Green | RESOL=AV, GRID=1.0/1.0 | Transformation from T1279 to the corresponding intermediate reduced octahedral Gaussian O1280, before going to 1.0/1.0. | Direct transformation from T1279 to 1.0/1.0, with no truncation. |
| Blue | RESOL=179, GRID=F90, and then GRID=1.0/1.0TODO: use the new keyword once it has been agreed | Transformation from T1279 to the F90 full (regular) Gaussian grid (with an automatic truncation to T179) followed by a grid-to-grid interpolation from the F90 grid to 1.0/1.0. | Same as in MIR, but a separate MARS request is needed for each of the two steps. |
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