Output units

For supported projections, the output map units will take the following output format:

 'proj 9999 r Dnnn'

 Where: proj (Characters 1 to 4) is the standard string listed below
        for the projection.  The string is left-justified.  If 
        the standard string is less than 4 characters the string
        is padded with trailing blanks.  (e.g. 'UTM ')

       (Character 5 is blank)

       9999 (Characters 6 to 9) is the zone number, if any.

• for the UTM projection, depending on the value of the subroutine argument UTMROW, the zone number is returned right-justified in the range of ' 1' to ' 60' (or ' -1' to ' -60').
• for SPCS projections: '0101' to '5400'
• for other projections: ' '

       (Character 10 is blank)

       r (Character 11) is the UTM or UPS grid zone row, if any.
         For all other systems, this is blank.
        
       (Character 12 is blank)

       Dnnn (Characters 13 to 16) Datum used for the projection.
       If no Earth model (either a datum or ellipsoid) is specified,
       the default is 'D000' (WGS84).

       Characters 13 to 16 may be an ellipsoid code, if there are
       no datum shifts required and you are working with only
       one datum.

• 'E000' to E019' for supported ellipsoids
• 'E999' is a special case, where the Earth model is not supported but was defined in ELLIPS