| Octet No. | Contents |
|---|---|
| 15 | Shape of the Earth (see Code
Table 3.2) |
| 16 | Scale factor of radius of
spherical Earth |
| 17-20 | Scaled value of radius of spherical Earth |
| 21 |
Scale factor of major axis of
oblate spheroid Earth |
| 22-25 | Scaled value of major axis of oblate spheroid Earth |
| 26 |
Scale factor of minor axis of oblate spheroid Earth |
| 27-30 |
Scaled value of minor axis of oblate spheroid Earth |
| 31-34 |
Nx ― number of points along the x-axis |
| 35-38 |
Ny ― number of points along the
y-axis |
| 39-42 |
La1 ― latitude of
first grid point |
| 43-46 |
Lo1 ― longitude of
first grid point |
| 47 | Resolution and component flags (see Flag Table 3.3 and Note 1) |
| 48-51 |
LaD ― latitude where Dx and Dy
are specified |
| 52-55 |
LoV ― orientation of the grid
(see Note2) |
| 56-59 |
Dx ― x-direction grid length (see Note 2) |
| 60-63 |
Dy ― y-direction grid length (see Note 3) |
| 64 |
Projection centre flag (see Flag
Table 3.5) |
| 65 |
Scanning mode (see Flag Table 3.4) |
| 66-69 | Nux – size of model forecast subdomain in x-direction (number of grid points) |
| 70-73 | Ncx – width of coupling area within forecast domain in x-direction (number of grid points) |
| 74-77 | Nuy – size of model forecast subdomain in y-direction (number of grid points) |
| 78-81 | Ncy – width of coupling area within forecast domain in y-direction (number of grid points) |
| Notes: 1. The resolution flags (bits 3-4 Flag table 3.3) are not applicable 2. LoV is the longitude value of the meridian which is parallel to the y-axis (or columns of the grid) along which latitude increases as the y-coordinate increases (the orientation longitude may or may not appear on a particular grid). 3. Grid length is in units of 10-3 m at the latitude specified by LaD. 4. Bit 2 of the projection flag is not applicable to the polar stereographic projection. 5. A scale value of radius of spherical Earth, or major or minor axis of oblate spheroid Earth is derived from applying appropriate scale factor to the value expressed in metres. |