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.
...
Description and example of grib2 files that we expect from partners.
Existing Grib1 Data : | Proposed Grib2 Data : | ||||||||||||
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 | |||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
WAVE_165.128_1x1.grib | 165.128 | 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] | 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 ? |
| |||
WAVE_166.128_1x1.grib | 166.128 | 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 | WAVE WAVE_229.140_1x1.grb2 | Significant height of combined | 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 | 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 | 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 | WAVE_230.140_1x1.grb2 | Direction of combined wind | 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:
...
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)
...
WMO tables :
View file | ||||
---|---|---|---|---|
|
View file | ||||
---|---|---|---|---|
|
...
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