W3FT08

The W3FT08 routine computes 2.5 x 2.5 N. hemi. grid 
           of 145 x 37 points from spectral coefficients in a
           rhomboidal 30 resolution representing a scaler field.

USAGE:  CALL W3FT08(FLN,GN,PLN,EPS,FL,WORK,TRIGS)

   Input variables:
      FLN       961 COMPLEX COEFF.
      PLN       992 REAL SPACE FOR LEGENDRE POLYNOMIALS.
      EPS       992 REAL SPACE FOR
                       COEFFS. USED IN COMPUTING PLN.
      FL        31 COMPLEX SPACE FOR FOURIER COEFF.
      WORK      144 REAL WORK SPACE FOR SUBR. W3FT12
      TRIGS     216 PRECOMPUTED TRIG FUNCS. USED
                       IN W3FT12, COMPUTED BY W3FA13
 
   Output variables:
      GN        (145,37) GRID VALUES.
                       5365 POINT GRID IS TYPE 29 OR 1D HEX O.N. 84
 
REMARKS:
        THIS SUBROUTINE WAS OPTIMIZED TO RUN IN A SMALL AMOUNT OF
        MEMORY, IT IS NOT OPTIMIZED FOR SPEED, 70 PERCENT OF THE TIME IS
        USED BY SUBROUTINE W3FA12 COMPUTING THE LEGENDRE POLYNOMIALS. SINCE
        THE LEGENDRE POLYNOMIALS ARE CONSTANT THEY NEED TO BE COMPUTED
        ONLY ONCE IN A PROGRAM. BY MOVING W3FA12 TO THE MAIN PROGRAM AND
        COMPUTING PLN AS A (32,31,37) ARRAY AND CHANGING THIS SUBROUTINE
        TO USE PLN AS A THREE DIMENSION ARRAY YOU CAN CUT THE RUNNING TIME
        70 PERCENT.  W3FT38 HAS THESE IMPROVEMENTS.

 
W3lib.tar Library contains Fortran 90 decoder/encoder routines for GRIB edition 1. (Fortran90)
Date posted: 2/22/2007