The current version of the QTCM provides coverage from 
S
to N in latitude
and coverage over all longitudes. The grid has
dimensions 
equal
to 64 
33. The east/west boundaries are periodic, and the
north/south boundaries are solid walls, with sponge
layers from 
S to S,
and N to N.
Thus, the grid spacing is 5.625 [i.e. 360/NX] degrees
longitude and 3.75 [i.e. 120/(NY-1)] degrees latitude.
Following FORTRAN convention, the first index increments in the zonal (x)
direction with increasing longitude in the eastward direction, beginning at
0 degrees E longitude. The second index increments in the meridional (y)
direction with increasing latitude northward, beginning at S
latitude (i.e. 
latitude). Thus:
grid box (1,1) is centered at 
E longitude,
latitude
grid box (2,1) is centered at 
E longitude,
latitude
grid box (2,2) is centered at E longitude,
latitude
grid box (NX,NY) is centered at 
E longitude,
latitude
The spatial array sizes NX and NY are set in the header file hgrid.h.
Higher resolution can be easily achieved by modifying hgrid.h and
subroutine parinit. However, revised boundary data
sets will then need to be supplied.
Section 3.2.2 has a more complete description of the
model grid.