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| Name | surface roughness | Abbreviation | sr | Unit | m |
| Definition | Aerodynamic roughness length (over land). |
| Validity | instantaneous |
| Comment | Archived once a day at 00Z for control forecast and re-forecast, only. |
GRIB2 definition
| Parameter |
|---|
| Discipline | 2 | land surface products
|
| Parameter Category | 0 | vegetation/biomass |
| Parameter Number | 1 | surface roughness
|
| Level |
|---|
| Type of first fixed surface | 1 | ground or water surface |
| Scale factor of first fixed surface | all bits to 1 | missing |
| Scaled value of first fixed surface | 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 |