NAME

       x_update - Archiving of Cross-Over Information


SYNOPSIS

       x_update cross-overfile [ -Xxbase ] [ -Llegbase ] [ -V ] [ -Wmax ]


DESCRIPTION

       x_update  reads the ASCII file produced by x_over and writes the infor-
       mation to the database files  xx_base.b  and  xx_legs.b  (unless  other
       filenames  are  specified  on the command line) using a compact, binary
       format. The options recognized are:

       -X     Indicate alternate xx_base.b file.

       -L     Indicate alternate xx_legs.b file.

       -V     Verbose. Reports the pair currently being processed.

       -W     Prints a warning if the number of COEs generated by any pair  of
              legs exceed max.


For security reasons the xx_legs.b are first renamed to xx_legs.b_old, to pre-

       vent loss of
       information if a black-out or system crash should occur during  writing
       of  the new xx_legs.b file. It is recommended that the old file is left
       on the disk in case of other disasters. Note  that  x_update  does  not
       check  if a pair of legs already exist in the xx_base.b file. It is the
       user’s’ responsibility to ensure that duplication of  information  does
       not  occur.  Should  some  pairs already in the database need to be re-
       examined, then run x_remove which will wipe out all traces of the spec-
       ified  cruises  from  the x_system data base files. Now we can pass the
       pairs that need to be redone through x_over/x_update again.


SEE ALSO

       gmt(GMTMANSECTION), x_system(GMTMANSECTION)


REFERENCES

       Wessel, P. XOVER: A Cross-over Error Detector for Track Data, Computers
       & Geosciences, 15, 333-346.



                                  1 Jan 2004                       x_update(l)

Man(1) output converted with man2html