| Octet No. | Contents |
|---|---|
| 15 | Shape of the Earth (See Code Table 3.2) |
| 16 | Scale Factor of radius of spherical Earth |
| 17-20 | Scale 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 | Ni—number of points along a parallel |
| 35-38 | Nj—number of points along a meridian |
| 39-42 | Basic angle of the initial production domain (see Note 1) |
| 43-46 | Subdivisions of basic angle used to define extreme longitudes and latitudes, and direction increments (see Note 1) |
| 47-50 | La1—latitude of first grid point (see Note 1) |
| 51-54 | Lo1—longitude of first grid point (see Note 1) |
| 55 | Resolution and component flags (see Flag Table 3.3) |
| 56-59 | La2—latitude of last grid point (see Note 1) |
| 60-63 | Lo2—longitude of last grid point (see Note 1) |
| 64-67 | Di—i direction increment (see Notes 1 and 5) |
| 68-71 | Dj—j direction increment (see Note 1 and 5) |
| 72 | Scanning mode (flags — see Flag Table 3.4) |
| 73-76 |
Latitude of the southern pole of
projection |
| 77-80 | Longitude of the southern pole
of projection |
| 81-84 |
Angle of rotation of projection |
| 85-88 | Latitude of the pole of
stretching |
| 89-92 |
Longitude of the pole stretching |
| 93-96 | Stretching factor |
| 97-nn |
List of
number of points along each meridian or parallel |
| Notes: 1. Basic angle of the initial production domain and subdivisions of this basic angle are provided to manage cases where the recommended unit of 10-6 degrees is not applicable to describe the extreme longitudes and latitudes, and direction increments. For these last six descriptors, the unit is equal to the ratio of the basic angle and the subdivisions number. For ordinary cases, zero and missing values should be coded, equivalent to respective values of 1 and 106 (10-6 degrees unit). 2. See Note (2) under grid definition template 3.1 ― rotated latitude/longitude (or equidistant cylindrical, or Plate Carree). 3. See Note (2) under grid definition template 3.2 ― stretched latitude/longitude (or equidistant cylindrical, or Plate Carree). 4. A quasi-regular grid is only defined for appropriate grid scanning modes. Either rows or columns, but not both simultaneously, may have variable numbers of points or variable spacing. The first point in each row (column) shall be positioned at the meridian (parallel) indicted by octets 47-54. The grid points shall be evenly spaced in latitude (longitude). 5. It is recommended to use unsigned direction increments. |