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Aim of this page :  Description and example of grib2 files that we expect from partners.

 

Existing Grib1 Data :Proposed Grib2 Data :
Sample fileMARSSample file

parameter

( WMO GRIB2 - TABLE 4.2-10-0)

DisciplineCategory
Number
Horizontal gridVertical level

 time

(grib2/tables/2/4.4.table)
Description
WAVE_165.128_1x1.grib

165.128

10 metre U wind component

WAVE_165.128_1x1.grb2U-component of wind  ( 10 m )  0 [ M products ]  2 [ Momentum ]2

 

 

 

 

 

 

 

. regular lat-long grid

. grid spacing free for the contributor to chose

. not need to be global


eg:

gridDefinitionTemplateNumber = 0 [Latitude/longitude]
latitudeOfFirstGridPoint = 90000000
longitudeOfFirstGridPoint = 0
latitudeOfLastGridPoint = -77500000
longitudeOfLastGridPoint = 359500000
iDirectionIncrement = 500000
jDirectionIncrement = 500000

I think I should  use :

102 Specific altitude above mean sea level

in section  4.

 What is your view ?














IndicatorOf
UnitOfTimeRange = 1 [Hour]  
 
 WAVE_166.128_1x1.grib

 166.128

10 metre V wind component

WAVE_166.128_1x1.grb2V-component of wind ( 10 m )  0 [ M products ]  2 [ Momentum ]3 
WAVE_229.140_1x1.grb

229.140

Significant height of combined wind waves and swell

 WAVE_229.140_1x1.grb2

Significant height of combined
wind waves and swell

10 [ O products ]  0 [ Waves ]3 

 

typeOfFirstFixedSurface = 101 [Mean sea level (grib2/tables/5/4.5.table) ]

 

typeOfSecondFixedSurface = 255

Four times the square root of the integral of wave variance spectrum.
WAVE_231.140_1x1.grib

231.140

Peak period of 1D spectra

 WAVE_231.140_1x1.grb2Peak wave period10 [ O products ]  0 [ Waves ]34Reciprocal of the frequency corresponding to the peak of the wave frequency spectrum.
WAVE_221.140_1x1.grib

221.140

Mean wave period based on second moment

WAVE_221.140_1x1.grb2Mean zero-crossing wave period10 [ O products ]  0 [ Waves ]28Mean  wave period based on  the second moment of  the frequency spectrum
WAVE_230.140_1x1.grib

230.140

Mean wave direction

WAVE_230.140_1x1.grb2

Direction of combined wind
waves and swell

10 [ O products ]  0 [ Waves ]14

Mean  wave direction derived from the vector mean direction from the wave variance spectrum.

 

 

 

WMO tables :

  

http://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc.shtml

http://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_table4-2-10-0.shtml

http://apps.ecmwf.int/codes/grib/format/grib2/ctables/4/5

 

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