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GRIB 1 Section 1 Octets | GRIB 2 Section 4 Octets | ecCodes key | Model identifier | |
|---|---|---|---|---|
47r3 | 48r1 | |||
6 | 14 | generatingProcessIdentifier | 153 | 154 |
| Infowarning |
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By default all gridded 48r1 direct model output in GRIB 2 will be encoded using a CCSDS defined compression method (Data representation template 5.42) and any gridded GRIB2 data derived from such fields will inherit the CCSDS compression. This affects e.g. fields produced on Gaussian grids, like specific humidity on model levels, or surface fields like most-unstable CAPE. See below on how to override the default behaviour. ecCodes, our encoding/decoding package, uses libaec (Adaptive Entropy Coding Library) which implements a Golomb-Rice coding as defined in the CCSDS recommended standard 121.0-B-3. Users are strongly advised to test that their software applications and data processing chain can handle this new compression method. To handle CCSDS compressed fields from 48r1 with ecCodes, version 2.28.0 or newer is recommended. For a discussion of available GRIB packing methods and the use of compression algorithms see the Technical Memo Impact of GRIB compression on weather forecast data and data-handling applications. |
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Availability of test data from the cycle 48r1 test suites
| Note | ||
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The CAMS operational FTP server (ECPDS) will serve the most recent 3 days of test data, once the e-suite is running in near-real-time, in the directories "/DATA/CAMS_GLOBAL_TEST" and "/DATA/CAMS_EUROPE_BC_TEST" for global and regional boundary condition data, respectively. In addition, surface level fields (model level 137) will be provided as individual files in the "/DATA/CAMS_GLOBAL_ADDITIONAL_TEST" directory. Users wanting to access the output from the current test system for a longer period can access the data from 1 September 2022 onwards directly on MARS or through. More details can be found here: Accessing CAMS 48r1 test data. |
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