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Any requested data manipulation or post-processing is carried out by the MARS client, except in the case of a local Member State's client where data is first processed at ECMWF prior to its transmission over the network. The post-processing is carried out by a set of routines present in the EMOSLIB library. Please, refer to the Field interpolation software routines for in-depth details about such post-processing.
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The truncation can be controlled using the resol keyword. Default truncations are detailed in the following table.
| Default spectral truncation wave number for given lat/lon grid increment ∆. | |
| Grid increment [deg] | Truncation |
| 2.5 ≤ ∆ | T63 |
| 1.5 ≤ ∆ < 2.5 | T106 |
| 0.6 ≤ ∆ < 1.5 | T213 |
| 0.4 ≤ ∆ < 0.6 | T319 |
| 0.3 ≤ ∆ < 0.4 | T511 |
| 0.15 ≤ ∆ < 0.3 | T799 |
| 0.09 ≤ ∆ < 0.15 | T1279 |
| 0.0 ≤ ∆ < 0.09 | T2047 |
Users wanting to post-process at the full archived resolution can specify resol = av in the request. Note that high resolutions might need more resources to carry out post-processing.
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MARS has the following levels for messages it prints on execution:
| INFO | request being processed and a report on the execution at the end |
| DEBUG | additional information if debugging is switched on |
| WARNING | any unusual aspect of the execution |
| ERROR | system or data errors which do not stop MARS execution |
| FATAL | terminates the execution of MARS |
Field order
Do not expect retrieved fields to be returned in any specific order. Depending on the MARS configuration, fields can be retrieved differently. Therefore, user programs processing the target file must take this into account.
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