Module dir_cart

NAME
    dir_cart.py

DESCRIPTION
  converts geomangetic elements to cartesian coordinates

INPUT (COMMAND LINE ENTRY) 
       declination inclination [magnitude]
      or
       longitude latitude
    if only two columns, assumes magnitude of unity
OUTPUT
       x1 x2  x3

SYNTAX
    dir_cart.py [-i] [command line options] [< filename]

OPTIONS
    -i for interactive data entry
    -f FILE, input file
    -F FILE, output file