W3FB06

The W3FB06 routine converts the coordinates of a location on 
           earth given in the natural coordinate system of
           latitude/longitude to a grid coordinate system
           overlaid on a polar stereographic map projection
           true at 60 degrees n or s latitude.

USAGE:  CALL W3FB06 (ALAT,ALON,ALAT1,ALON1,DX,ALONV,XI,XJ)

   Input argument list:
     ALAT     - LATITUDE IN DEGREES (NEGATIVE IN SOUTHERN HEMIS)
     ALON     - EAST LONGITUDE IN DEGREES, REAL*4
     ALAT1    - LATITUDE  OF LOWER LEFT POINT OF GRID (POINT (1,1))
     ALON1    - LONGITUDE OF LOWER LEFT POINT OF GRID (POINT (1,1))
                ALL REAL*4
     DX       - MESH LENGTH OF GRID IN METERS AT 60 DEG LAT
                MUST BE SET NEGATIVE IF USING
                SOUTHERN HEMISPHERE PROJECTION.
                   190500.0 LFM GRID,
                   381000.0 NH PE GRID, -381000.0 SH PE GRID, ETC.
     ALONV    - THE ORIENTATION OF THE GRID.  I.E.,
                THE EAST LONGITUDE VALUE OF THE VERTICAL MERIDIAN
                WHICH IS PARALLEL TO THE Y-AXIS (OR COLUMNS OF
                OF THE GRID)ALONG WHICH LATITUDE INCREASES AS
                THE Y-COORDINATE INCREASES.  REAL*4
                   FOR EXAMPLE:
                   255.0 FOR LFM GRID,
                   280.0 NH PE GRID, 100.0 SH PE GRID, ETC.

   Output argument list:
     XI       - I COORDINATE OF THE POINT SPECIFIED BY ALAT, ALON
     XJ       - J COORDINATE OF THE POINT; BOTH REAL*4

REMARKS:
        Formulae and notation loosely based on Hoke, Hayes,
        and Renninger's "map projections and grid systems...",
        March 1981 AFGWC/TN-79/003

 


  
W3lib.tar
  
Library contains Fortran 90 decoder/encoder
   routines for GRIB edition 1. (Fortran90) 

   Date posted: 2/22/2007