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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.

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Description and example of grib2 files that we expect from partners.

Sample file	MARS	Sample file	parameter ( WMO GRIB2 - TABLE 4.2-10-0)	Discipline	Category	Number	GridHorizontal grid	vertical Vertical level	time (grib2/tables/2/4.4.table)	Description
Existing Grib1 Data :		Proposed Grib2 Data :
WAVE_165.128_1x1.grib	165.128 10 metre U wind component	WAVE_165.128_1x1.grb2	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 eg: gridDefinitionTemplateNumber = 0 [Latitude/longitude] latitudeOfFirstGridPoint = 90000000 longitudeOfFirstGridPoint = 0 latitudeOfLastGridPoint = -77500000 longitudeOfLastGridPoint = 359500000 iDirectionIncrement = 500000 jDirectionIncrement = 500000	I think I should use : Code table4.5 – Fixed surface types and units ?? 102 Specific altitude above mean sea level103 Specified height level above ground 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.grb2	2			V-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 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.grb2	Peak wave period	10 [ O products ]	0 [ Waves ]	34		Reciprocal 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.grb2	5			Mean zero-crossing wave period		10 [ O products ]	0 [ Waves ]		28		Mean 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.

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

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parameter Name

...

parameter
Number

...

vertical level

(grib2/tables/2/4.5.table)

...

time

(grib2/tables/2/4.4.table)

...

WMO

...

0

...

scaledValueOfFirstFixedSurface = 1

typeOfSecondFixedSurface = 255 [Missing ]

scaleFactorOfSecondFixedSurface = 0

...

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

...

IndicatorOf

UnitOfTimeRange = 1 [Hour]

...

v-component of wind

...

tables

...

Significant height of 
combined wind waves and swell

_{(WMO GRIB2 compliant)}

...

height.grib2

WMO tables :

View file

name	GRIB2_062006.pdf
height	250

View file

name	WMO306_vI2_GRIB2_Template_en.pdf
height	250

...

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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