Aim of this page :

  1. 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)
  2. 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
  3. 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 :
  parameterDisciplineCategory
parameter
Number
GridDescription
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 ?

 
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 
4 Peak wave period10 [ O products ]  0 [ Waves ]34Mean  wave period based on  the second moment of  the frequency spectrum
5 Mean zero-crossing wave period10 [ 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

DisciplineCategory
parameter
Number
vertical levelhorizontal grid timebitmapfile
u-component of wind

0

 

22



typeOfFirstFixedSurface = 1 
[Ground or water surface]
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 
023vcomp.grib2
Significant height of 
combined wind waves and swell
1003

height.grib2