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- Each partner will provide their eps data on a 0.25/0.25 regular lat-lon grid (1440x721 grid points, including poles).
- First grid point is 90N 0E. The data will be archived first from west to east (OE to 358.5), and then from north to south (90N to 90S).
- The related GRIB 2 meta data called scanning mode should equal to 0.
Scanning mode 0
- i scans positively (west to east)
- i points are consecutive
- j scans negatively (north to south)
- i scans positively (west to east)
- The fields have to be provided on...
- Grids are defined in GRIB2 using an accuracy of 1/1000000 (one millionth) of a degree.
Data compression
CCSDS compression should be used
GRIB2 encoding
All data must be encoded following the required rules described below to achieve fully compliant WPMIP format from all centres.
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*2 New codes for the WPMIP (part of GRIB 2 tables version 36) to be approved by WMO by August 2025 (Manual on Codes (WMO-No. 306), Volume I.2, GRIB code table 1.3)
| Section 4 | |||
|---|---|---|---|
| Octets | Value (Example perturbed) | Value (Example control) | |
| 8-9 | |||
| productDefinitionTemplateNumber | 1/11* | 1/11* |
| 13 |
| backgroundProcess | ||
| 14 |
| generatingProcessIdentifier | ||
| 35 |
| typeOfEnsembleForecast | 255 (missing) | 255 (missing) |
| 36 |
| perturbationNumber | 7 | 0 |
| 37 |
| numberOfForecastsInEnsemble | 51 | 51 |
(*) statistically processed (typeOfStatisticalProcessing is set up)
| Section 5 | |||
|---|---|---|---|
| Octets | Value | Description | |
| 10-11 | |||
| dataRepresentationTemplateNumber | 42 | [Grid point data - CCSDS recommended lossless compression (grib2/tables/29/5.0.table) ] |
WMO Centre codes
The codes below are based on WMO Manual 306 - WMO Codes. Each organization must be uniquely identified by its WMO code. If necessary to distinguish between two organizations using the same WMO code the Sub-Centre one which differs must be provided.
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