Wave verification GRIB data

Aim of this page :

a table with NCEP data: GRIB sample (only one message and one parameter), encoding explained (not only parameter we need to have all the significant descriptions including the geography)
A table with what we aim to have from the partners. Description in words, GRIB2 coding (not only parameter also all other relevant coding details), possibly an example of grib for each parameter
A common description of the grid we are going to ask the users. We said that this is going to be a global domain. I think we also need a bitmap.

After talking with  Jean Bidlot  we concluded that what we are asking our contributors for in GRIB2 language is :

	parameter	Discipline	Category	parameter Number	Grid	vertical level	Description
1	U-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 . bitmap ?	Code table4.5 – Fixed surface types and units ?? 102 Specific altitude above mean sea level 103 Specified height level above ground
2	V-component of wind ( 10 m )	0 [ M products ]	2 [ Momentum ]	3
3	Significant height of combined wind waves and swell	10 [ O products ]	0 [ Waves ]	3		?? typeOfFirstFixedSurface = 1 [Ground or water surface] 101 Mean sea level
4	Peak wave period	10 [ O products ]	0 [ Waves ]	34			Mean wave period based on the second moment of the frequency spectrum
5	Mean zero-crossing wave period	10 [ O products ]	0 [ Waves ]	28
6	Direction of combined wind waves and swell	10 [ O products ]	0 [ Waves ]	14			Mean wave direction

NCEP sample file  multi_1.glo_30mext.t00z.f000.grib contains:

parameter Name

Discipline

Category

parameter
Number

vertical level

horizontal grid

time

bitmap

file

u-component of wind

0

2


 (grib2/tables/2/4.5.table)

typeOfFirstFixedSurface = 1 
[Ground or water surface]

typeOfSecondFixedSurface = 255 [Missing ]

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

IndicatorOf

UnitOfTimeRange = 1 [Hour]



bitMapIndicator = 0 
[A bit map applies to this product]

ucomp.grib2

v-component of wind

0

2

3

vcomp.grib2

Significant height of 
combined wind waves and swell

10

0

3

height.grib2

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Wave verification GRIB data