Contents of /MITgcm/utils/cs_grid/README

# $Header:  $
# $Name:  $

Some tools (matlab scripts for now) specific to the Cubed-Sphere grid :

split_C_cub.m   :: split a 2d,3d global CS-field into 6 faces ;
        apply to cell-centered CS-field ; extend the face array by 
        adding 1 row & 1 column (like the exchanges)
split_Z_cub.m   :: split a 2d,3d global CS-field into 6 faces ;
        apply to cell-corner CS-field ; extend the face array by 
        adding 1 row & 1 column (like the exchanges)
split_UV_cub.m  :: split the 2 C-grid components of a vector 
        (2d,3d global CS-field) into 6 faces ; extend the face array 
        by adding 1 row or 1 column (like the exchanges)

cubeZ2latlon.m  :: interpolate a CS-field to regular Lat-lon grid ;
        similar to cube2latlon.m but apply to a field that is
        located at the corner point of the C-grid cell.
        (deal with the 2 "missing corners")

calc_vort_cs.m  :: compute vorticity (vertical component) on CS-grid
        from MITgcm output velocity fields u,c (on C-grid); 
        Use the model discretization of vorticity. 

the following scripts are reading a file that contains the orientation
        of the local direction of the CS-grid relative to E-W,N-S direction.  
  file= proj_cs[]_2uEvN.bin :: cos & sin of rotation angle, 
                      format:: real*8, big-endian, size=32x6x32 x2(cos+sin)
        for standard cs32 grid, the corresponding file is:
           verification/global_ocean.cs32x15/input/proj_cs32_2uEvN.bin 

rotate_csAg_EN.m :: Rotate cell centered (A-grid) U,V vector components
        of CS-grid to East,North directions. works for 2D or 3D vector.

rotate_csCg_EN.m :: Rotate MITgcm C-grid U,V vector components of CS-grid 
        to East,North directions. done in 2 steps: 1rst compute the average
        at the cell-center and then rotate the vector.

uvLatLon2cube.m :: interpolate a 2 components vector field U,V (on A-grid)
        to the MITgcm CS-grid (C-grid).
 
More in dir bk_line:
 Scripts that generate "broken-lines" (used to compute Meridional Transport
  stream-function and vertically integrated horizontal stream-function)
 + a README file + an example for each one.
1	# $Header: $
2	# $Name: $
3
4	Some tools (matlab scripts for now) specific to the Cubed-Sphere grid :
5
6	split_C_cub.m :: split a 2d,3d global CS-field into 6 faces ;
7	apply to cell-centered CS-field ; extend the face array by
8	adding 1 row & 1 column (like the exchanges)
9	split_Z_cub.m :: split a 2d,3d global CS-field into 6 faces ;
10	apply to cell-corner CS-field ; extend the face array by
11	adding 1 row & 1 column (like the exchanges)
12	split_UV_cub.m :: split the 2 C-grid components of a vector
13	(2d,3d global CS-field) into 6 faces ; extend the face array
14	by adding 1 row or 1 column (like the exchanges)
15
16	cubeZ2latlon.m :: interpolate a CS-field to regular Lat-lon grid ;
17	similar to cube2latlon.m but apply to a field that is
18	located at the corner point of the C-grid cell.
19	(deal with the 2 "missing corners")
20
21	calc_vort_cs.m :: compute vorticity (vertical component) on CS-grid
22	from MITgcm output velocity fields u,c (on C-grid);
23	Use the model discretization of vorticity.
24
25	the following scripts are reading a file that contains the orientation
26	of the local direction of the CS-grid relative to E-W,N-S direction.
27	file= proj_cs[]_2uEvN.bin :: cos & sin of rotation angle,
28	format:: real*8, big-endian, size=32x6x32 x2(cos+sin)
29	for standard cs32 grid, the corresponding file is:
30	verification/global_ocean.cs32x15/input/proj_cs32_2uEvN.bin
31
32	rotate_csAg_EN.m :: Rotate cell centered (A-grid) U,V vector components
33	of CS-grid to East,North directions. works for 2D or 3D vector.
34
35	rotate_csCg_EN.m :: Rotate MITgcm C-grid U,V vector components of CS-grid
36	to East,North directions. done in 2 steps: 1rst compute the average
37	at the cell-center and then rotate the vector.
38
39	uvLatLon2cube.m :: interpolate a 2 components vector field U,V (on A-grid)
40	to the MITgcm CS-grid (C-grid).
41
42	More in dir bk_line:
43	Scripts that generate "broken-lines" (used to compute Meridional Transport
44	stream-function and vertically integrated horizontal stream-function)
45	+ a README file + an example for each one.