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With 48r1 all gridded GRIB2 "raw" data will use the new CCSDS packing type. The default behaviour for data from dissemination (from 00 UTC run 21/3/2023) and MARS will be as follows:
| Input field | MARS output packing type (with keyword grid=... ) | Dissemination output packing type (with keyword grid=... ) |
|---|---|---|
| GRIB1/GRIB2 gridded | inherited from input | inherited from input |
| GRIB1 SH | simple | simple |
| GRIB2 SH | simple | CCSDS |
While by default all 48r1 gridded GRIB2 data will be disseminated in CCSDS packing, MARS will by default only write gridded GRIB2 data in CCSDS if derived from (gridded) CCSDS-packed GRIB2 fields.
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| Date | Reason for update |
|---|---|
| 16 February 2023 | Initial version |
| 29 March 2023 | Detailed list of changes and expected implementation date |
| 19 April 2023 | Added table with new parameters |
| 25 April | Update of Impact section |
| 05 May 2023 | Update of Change to GRIB encoding section and Default packing types section |