Grid Definition Template 3.10 - Mercator



Octet No.	Contents
15	Shape of the earth (see Code Table 3.2)
16	Scale factor or radius of spherical earth
17-20	Scaled value of radius of spherical earth
21	Scaled value 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	La1 - latitude of first grid point
43-46	Lo1 - longitude of first grid point
47	Resolution and component flags (see Flag Table 3.3)
48-51	LaD - Latitude(s) at which the Mercator projection intersects the Earth (Latitude(s) where Di and Dj are specified)
52-55	La2 - latitude of last grid point
56-59	Lo2 - longitude of last grid point
60	Scanning mode (flags - see Flag Table 3.4)
61-64	Orientation of the grid, angle between i direction on the map and the equator (see Note 1, below)
65-68	Di - i direction increment (see Note 2, below)
69-72	Dj - j direction increment (see Note 2, below)


Notes:

(1) Limited to the range of 0 to 90 degrees; if the angle of orientation of the grid is neither 0 nor 90 degrees, Di and Dj must be equal to each other.

(2) Grid lengths are in units of 10^-3 m, at the latitude specifed by LaD.