Grid 0: Latitude/longitude grid or equidistant cylindrical, or Plate Carrée

Grids

Octets	Key	Type	Content
7-8	Ni	unsigned	Ni number of points along a parallel
9-10	Nj	unsigned	Nj number of points along a meridian
11-13	latitudeOfFirstGridPoint	signed	La1 latitude of first grid point
14-16	longitudeOfFirstGridPoint	signed	Lo1 longitude of first grid point
17	resolutionAndComponentFlags	codeflag	Resolution and component flags (see Code table 7)
18-20	latitudeOfLastGridPoint	signed	La2 latitude of last grid point
21-23	longitudeOfLastGridPoint	signed	Lo2 longitude of last grid point
24-25	iDirectionIncrement	unsigned	Di i direction increment
26-27	jDirectionIncrement	unsigned	Dj j direction increment
28	scanningMode	codeflag	Scanning mode (flags see Flag/Code table 8)
29-32			Set to zero (reserved)

Notes:

( 1) Latitude, longitude and increments are in millidegrees.

( 2) Latitude values are limited to the range 090 000; bit 1 is set to 1 to indicate south latitude.

( 3) Longitude values are limited to the range 0360 000; bit 1 is set to 1 to indicate west longitude.

( 4) The latitude and longitude of the last grid point and the first grid point should always be given for regular grids.

( 5) Where items are not given, the appropriate octet(s) should have all bits set to 1.

( 6) 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 latitude in degrees of the southern pole of the coordinate system, theta_p for example;
     (b) The geographic longitude in degrees of the southern pole of the coordinate system, lambda_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 lambda_p degrees about the geographic polar axis, and then rotating through (90 + theta_p) degrees so that the southern pole moved along the (previously rotated) Greenwich meridian.

( 11) The first and last grid points may not necessarily correspond to the first and last data points, respectively, if the bit-map section is used.

( 12) For data on a quasi-regular grid, in which all the rows or columns do not necessarily have the same number of grid points, either Ni (octets 7-8) or Nj (octets 9-10) and the corresponding Di (octets 24-25) or Dj (octets 26-27) shall be coded with all bits set to 1 (missing); the actual number of points along each parallel or meridian shall be coded.

( 13) 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. The first point in each row (column) shall be positioned at the meridian (parallel) indicated by octets 11-16. The grid points shall be evenly spaced in latitude (longitude).