DragonFly On-Line Manual Pages

X_UPDATE(1)                  Generic Mapping Tools                 X_UPDATE(1)

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
       information 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     Selects verbose mode, which will send progress reports to stderr
              [Default runs "silently"].  Reports the pair currently being
              processed.

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

BEWARE
       For security reasons the xx_legs.b are first renamed to xx_legs.b_old,
       to prevent 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 specified 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(1), x_system(1)

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

GMT 4.5.14                        1 Nov 2015                       X_UPDATE(1)