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More Sections
| Octets | Key | Type | Content |
| 10 | Parameter category (see Code Table 4.1). | ||
| 11 | Parameter number (see Code Table 4.2). | ||
| 12 | Type of generating process (see Code Table 4.3) | ||
| 13 | Background generating process identifier (defined by originating centre) | ||
| 14 | Analysis or forecast generating processes identifier (defined by originating centre) | ||
| 15-16 | Hours of observational data cutoff after reference time (see Note 1) | ||
| 17 | Minutes of observational data cutoff after reference time | ||
| 18 | Indicator of unit of time range (see Code Table 4.4) | ||
| 19-22 | Forecast time in units defined by octet 18 | ||
| 23 | Type of first fixed surface (see Code Table 4.5) | ||
| 24 | Scale factor of first fixed surface | ||
| 25-28 | Scaled value of first fixed surface | ||
| 29 | Type of second fixed surface (see Code Table 4.5) | ||
| 30 | Scale factor of second fixed surface | ||
| 31-34 | Scaled value of second fixed surface | ||
| 35 | First dimension physical significance (Code Table 5.3) (see Note 2) | ||
| 36 | Second dimension physical significance (Code Table 5.3) (see Note 2) | ||
| 37-40 | First dimension coordinate value (IEEE 32-bit floating-point value) | ||
| 41-44 | Second dimension coordinate value (IEEE 32-bit floating-point value) | ||
| 45-48 | First dimension (rows) of the complete matrix (see Note 3) | ||
| 49-52 | Second dimension (columns) of the complete matrix (see Note 3) |
( 1) Hours greater than 65534 will be coded as 65534.
( 2) In case of ocean wave spectra e.g., according to Code Table 5.3, the physical significance values are 1 (Direction Degrees true) and 2 (Frequency s-1).
( 3) The dimensions define the number of GRIBs needed for reconstruction of a complete matrix (e.g. wave spectrum) at one or more grid points. In case of vectors (1-dim-matrices), the second dimension must be set to 1 and the second dimension physical significance must be set to 255 (missing). In case of multi component parameter (e.g. no matrix or vector element), first and second dimension are set to 1.