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| Definition | The land-sea mask is a field that contains, for every grid point, the proportion of land in the grid box. The values are between 0 (sea) and 1 (land). |
| Validity | instantaneousFixed |
| Comment | Archived for control forecast and re-forecast, only once a day at 00Z Please note the typo in the GRIB2 manual: 0=land and 1=sea. The ET-DRC agreed that this is a typo and the correct usage is: 1 indicates land and 0 indicates sea. |
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