W3FC07

The W3FC07 routine computes the earth-oriented wind components at
           the given grid-oriented wind components on a Northern
           hemisphere polar stereographic grid point.  If the
           input winds are at the North pole, the output components
           will be made consistent with the WMO standards for
           reporting winds at the North pole.
           (see Office Note 241 for WMO definition.)

USAGE:    CALL W3FC07 (FFID, FFJD, FGU, FGV, FU, FV)

   Input argument list:
      FFID     - REAL   I-DISPLACEMENT FROM POINT TO NORTH POLE
      FFJD     - REAL   J-DISPLACEMENT FROM POINT TO NORTH POLE
      FGU      - REAL   GRID-ORIENTED U-COMPONENT
      FGV      - REAL   GRID-ORIENTED V-COMPONENT

   Output argument list:
      FU       - REAL   EARTH-ORIENTED U-COMPONENT, POSITIVE FROM WEST
                 MAY REFERENCE THE SAME LOCATION AS FGU.
      FV       - REAL   EARTH-ORIENTED V-COMPONENT, POSITIVE FROM SOUTH
                 MAY REFERENCE THE SAME LOCATION AS FGV.

REMARKS:
        Calculate ffid and ffjd as follows:
                 FFID = REAL(IP - I)
                 FFJD = REAL(JP - J)
        where (ip,jp) is the grid coordinates of the North pole
        and (I,J) is the grid coordinates of the point where
        fgu and fgv occur.

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