GRIB-API ecCodes definition
| Name: | Spectral mean direction over all frequencies and direction of the two-dimensional wave spectrumMean wave direction | Abbreviation: | mwd | Unit: | degree true | paramId: | 140230 |
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Other details
| Definition | Better known as the Significant Wave Height. The significant wave height is defined as 4 times the square root of the integral over all directions and all frequencies Spectral mean direction over all frequencies and direction of the two-dimensional wave spectrum. The integration is performed over all frequencies up to infinity. |
| Validity | instantaneous |
| Comment |
| Missing values should be encoded as bitmap. |
WMO GRIB2 definition
| Parameter | ||
|---|---|---|
| Discipline | 10 | oceanographic products |
| Parameter category | 0 | waves |
| Parameter number | 14 | Direction of combined wind waves and swell |
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| Level | |||
|---|---|---|---|
| Type of first fixed surface | 101 | 1 | ground or water surfaceMean sea level |
| Scale factor of first fixed surface | 0 | all bits to 1 | missing |
| Scaled value of first fixed surface | 0 | all bits to 1 | missing |
| Type of second fixed surface | all bits to 1 | missing | |
| Scale factor of second fixed surface | all bits to 1 | missing | |
| Scaled value of second fixed surface | all bits to 1 | missing | |
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