GRIB2 - GRID TEMPLATE 3.1
Rotated Latitude/Longitude (or equidistant cylindrical, or Plate Carree)
Created 06/29/2005

Octet | Contents
--- | ---
15-72 | Same as grid definition Template 3.0 (see note 1)
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

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 ration 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. Three parameters define a general latitude/longitude coordinate system, formed by a general rotation of the sphere. One choice for these parameters is: (a) The geographic longitude in degrees of the southern pole of the coordinate system, 06 for example; (b) The geographic longitude in degrees of the southern pole of the coordinate system, λ p for example; (c) The angle of rotation in degrees about the new polar axis (measured clockwise when looking from the southern to the northern pole) of the coordinate system, assuming the new axis to have been obtained by first rotating the sphere through λ p degrees about the geographic polar axis and then rotating through (90 + 0p) degrees so that the southern pole moved along the (previously rotated) Greenwich meridian.

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