Module di_vgp

NAME
    di_vgp.py
DESCRIPTION
  converts declination/inclination to virtual geomagnetic pole

SYNTAX
    di_vgp.py [-h] [-i] [-f FILE] [< filename]

OPTIONS
    -h prints help message and quits
    -i interactive data entry
    -f FILE to specify file name on the command line

INPUT 
  for file entry:
    D I SLAT SLON      
  where:
     D: declination
     I: inclination
     SLAT: site latitude (positive north)
     SLON: site longitude (positive east)
           
OUTPUT
    PLAT PLON
    where:
         PLAT: pole latitude 
         PLON: pole longitude (positive east)