GRIB2 - GRID TEMPLATE 3.40
Gaussian Latitude/Longitude
Created 2/9/2006

Octet | Contents
--- | ---
15 | Shape of the Earth (See 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 paralell
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 Note 1)
68-71 | N - number of paralells between a pole and the equator (see Note 2)
72 | Scanning mode (flags - see Flag Table 3.4)

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, unit is equal to the ratio of the equivalent to respective values of 1 and 106 (10-6 degrees unit). 2. The number of parallels between a pole and the equator is used to establish the variable (Gaussian) spacing of the parallels; this value must always be given. 3. A scaled value of radius of spherical Earth, or major or minor axis of oblate spheriod Earth is derived from applying appropriate scale factor to the value expressed in metres.

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