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  • The fields have to be provided on a  regular latitude‐longitude grid at the resolution that is best matching the native resolution of the direct  model output.
  • Grids are defined in GRIB2 using an accuracy of 1/1000000 (one millionth) of a degree.

GRIB2 encoding

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Encoding software

ECMWF makes available a GRIB decoding library (ecCodes) for the benefit of the WMO community. The ecCodes can be freely downloaded from here and the documentation can be found here.  ecCodes EcCodes provides a simplified access to GRIB2 headers through a set of virtual keys documented here

WAVE-GRIB2 checking tool

Tool for checking input file compliance with the agreed GRIB2 format; any other additional checks (geometry, basic data quality i.e. allowed extremes check etc)? TBD

Encoding details

The complete WMO compliant GRIB2 definitions of all wave parameters are linked in the page Wave verification

General encoding details

 

Column
width50%
Section 1
Octets Key nameValueDescription
6-7centreXCentre's code (next table)
8-9subCentreXIf centre is not sufficient (next table)
10tablesVersion19latest WMO table
20productionStatusOfProcessedData0

Operational products

  1Operational test products
21typeOfProcessedData1Forecast products
Section

 

asdfa

Centre codes (WMO Manual 306 - WMO Codes)

 OrganisationAcronymcentrevaluesubCentrevaluedescription
1

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European Centre for  Medium-Range Weather

ECMWF  N/AN/A

ECMWF (RSMC)

2Met office, UKUKMO     
3Fleet Numerical Meteorology and Oceanography Centre, USAFNMOC     
4Environment and Climate Change Canada, Canada

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UK Meteorological Office, Bracknell (RSMC)

ECCC     
5National Centres for Environmental Prediction, USANCEP     
6Météo France, FranceMETFR     
7Deutscher Wetterdienst, GermanyDWD   

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8

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Operational products

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Bureau of Meteorology, AustraliaBoM     
9Service Hydrographique et Océanographique de la Marine, FranceSHOM

    
10Japan Meteorological Agency, JapanJMA     
11Korea Meteorological Administration, Republic of KoreaKMA     
12Puertos del Estado, SpainPRTOS     
13Danmarks Meteorologiske Institut, DenmarkDMI     
14

National Institute of Water

 and Atmospheric Research, New Zealand		NIWA     
15

Det Norske Meteorologiske Institutt, Norway

METNO     
16

Servicio de Hidrografía Naval, Servicio Meteorológico, Argentina

SHNSM     
17

New Zealand MetService

NZMS     
18Servizio Meteorologico dell'Aeronautica Militare, ItalyMETEOAM     

 

nazdar

 

 

 

 

 

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Section 4
OctetsKey name

Value

Description

8-9productDefinitionTemplateNumber

0

Analysis and Forecast products (instantaneous)

(Analysis or forecast at a horizontal level or in a horizontal layer at a point in time (grib2/tables/17/4.0.table))

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parameter

Sample file

10 metre U wind component 

WAVE_165.128_1x1.grb2

10 metre V wind component 

WAVE_166.128_1x1.grb2
Mean wave period based on second momentWAVE_221.140_1x1.grb2
Mean wave directionWAVE_230.140_1x1.grb2
Peak wave periodWAVE_231.140_1x1.grb2

Significant height of combined wind waves and swell

WAVE_229.140_1x1.grb2