| Octet No. | Contents |
|---|---|
| 15 | Shape of the Earth (See Code Table 3.2) |
| 16-18 | Number of grid used (defined by originating centre) |
| 19 | Number of grid in reference (to allow annotating for Arakawa C-grid on arbitrary grid) (see Note 1) |
| Notes: 1. The number is associated with an attribute of the respective grid description which consists of the centre longitude/latitude and the longitude/latitude of the boundary polygon vertices. variables can be defined on different positions in the triangle. This leads to different set of geographic locations, e.g.: 1. Triangle (i) (pressure, temperature, ...) 2. Quads (l) (wind velocity ..) 3.Hexagons respectively pentagons (v) (Vorticity,...) |