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After talking with Jean Bidlot we concluded that what we are asking our contributors for in GRIB2 language is :
| Existing Grib1 Data : | Proposed Grib2 Data : | |||||||||
| Sample file | MARS | Sample file | parameter ( WMO GRIB2 - TABLE 4.2-10-0) | Discipline | Category | Number | Grid | vertical level | time (grib2/tables/2/4.4.table) | 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
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| 2 | V-component of wind ( 10 m ) | 0 [ M products ] | 2 [ Momentum ] | 3 | ||||||
| WAVE_229.140_1x1.grb | 229.140 | WAVE_229.140_1x1.grb2 | 3 | Significant height of combined | 10 [ O products ] | 0 [ Waves ] | 3 | ?? typeOfFirstFixedSurface = 1[Ground or water surface] 101 101 [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 4 | 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. | |||
| 5 | Mean zero-crossing wave period | 10 [ O products ] | 0 [ Waves ] | 28 | Mean wave period based on the second moment of the frequency spectrum | |||||
| 6WAVE_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. | |||
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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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