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parameter ( WMO GRIB 2 ) | Discipline | Category | parameter | 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 | 10 [ O products ] | 0 [ Waves ] | 3 | ?? typeOfFirstFixedSurface = 1 [Ground or water surface]
101 Mean sea level
| 4 times the square root of the integral of wave variance spectrum. | ||
| 4 | Peak wave period | 10 [ O products ] | 0 [ Waves ] | 34 | Mean wave period based on the second moment of the frequency spectrumReciprocal of the frequency corresponding to the peak of the wave frequency spectrum. | |||
| 5 | Mean zero-crossing wave period | 10 [ O products ] | 0 [ Waves ] | 28 | Mean wave period based on the second moment of the frequency spectrum | |||
| 6 | 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:
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(grib2/tables/2/4.4.table)
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scaledValueOfFirstFixedSurface = 1
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typeOfSecondFixedSurface = 255 [Missing ]
scaleFactorOfSecondFixedSurface = 0
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