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DCL:MATH2:SHTLIB: Spherical Harmonic Functions: Explanation of Subroutines

4.3.7 SHTG2W

1.

Function

Performs forward Fourier transformation, which corresponds to the first half of the forward spectral transformation.

2.

Definition

Performs forward Fourier transformation on grid data.

3.

Call

SHTG2W(MM,JM,IM,G,W,WORK)

4.

Explanation of Parameters

MM	(I)	Input parameter. The cut-off wavenumber (M).
JM	(I)	Input parameter. 1/2 of the NS partition number (J)
IM	(I)	Input parameter. 1/2 of the EW partition number (I)
G	(R)	Input parameter. Grid data. (For length and arrangement, see SHTW2G.)
W	(R)	Output parameter. Wave data. (For length and arrangement, see SHTS2W.)
WORK	(R)	Working area initialized by SHTINT.

5.

Notes

(a)

When the grid data G has been created by SHTW2G, the above integral will be free of aliasing and can be exactly evaluated.