sptez.f File Reference

Perform a simple scalar spherical transform. More...

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Functions/Subroutines
subroutine	sptez (IROMB, MAXWV, IDRT, IMAX, JMAX, WAVE, GRID, IDIR)
	This subprogram performs a spherical transform between spectral coefficients of a scalar quantity and a field on a global cylindrical grid. More...

Detailed Description

Perform a simple scalar spherical transform.

Author

Iredell

Date

96-02-29

Definition in file sptez.f.

Function/Subroutine Documentation

sptez()

subroutine sptez	(		IROMB,
			MAXWV,
			IDRT,
			IMAX,
			JMAX,
		real, dimension((maxwv+1)*((iromb+1)*maxwv+2))	WAVE,
		real, dimension(imax,jmax)	GRID,
			IDIR
	)

This subprogram performs a spherical transform between spectral coefficients of a scalar quantity and a field on a global cylindrical grid.

The wave-space can be either triangular or rhomboidal.

The grid-space can be either an equally-spaced grid (with or without pole points) or a Gaussian grid.

The wave field is in sequential 'IBM ORDER'.

The grid field is indexed East to West, then North to South.

For more flexibility and efficiency, call sptran().

Subprogram can be called from a multiprocessing environment.

Minimum grid dimensions for unaliased transforms to spectral:

DIMENSION	LINEAR	QUADRATIC
IMAX	2*MAXWV+2	3*MAXWV/2*2+2
JMAX (IDRT=4,IROMB=0)	1*MAXWV+1	3*MAXWV/2+1
JMAX (IDRT=4,IROMB=1)	2*MAXWV+1	5*MAXWV/2+1
JMAX (IDRT=0,IROMB=0)	2*MAXWV+3	3*MAXWV/2*2+3
JMAX (IDRT=0,IROMB=1)	4*MAXWV+3	5*MAXWV/2*2+3
JMAX (IDRT=256,IROMB=0)	2*MAXWV+1	3*MAXWV/2*2+1
JMAX (IDRT=256,IROMB=1)	4*MAXWV+1	5*MAXWV/2*2+1

Parameters

	IROMB	spectral domain shape (0 for triangular, 1 for rhomboidal)
	MAXWV	spectral truncation
	IDRT	grid identifier IDRT=4 for Gaussian grid, IDRT=0 for equally-spaced grid including poles, IDRT=256 for equally-spaced grid excluding poles
	IMAX	even number of longitudes.
	JMAX	number of latitudes.
[out]	WAVE	wave field if IDIR>0 where MX=(MAXWV+1)*((IROMB+1)*MAXWV+2)/2
[out]	GRID	grid field (E->W,N->S) if IDIR<0
	IDIR	transform flag (IDIR>0 for wave to grid, IDIR<0 for grid to wave).

Author

Iredell

Date

96-02-29

Definition at line 49 of file sptez.f.

References ncpus(), and sptranf().