Manual Reference Pages - X_UPDATE (1)
x_update - Archiving of Cross-Over Information
x_update cross-overfile [ -Xxbase ] [ -Llegbase ]
[ -V ] [ -Wmax ]
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:
Indicate alternate xx_base.b file.
Indicate alternate xx_legs.b file.
Selects verbose mode, which will send progress reports to stderr [Default runs "silently"].
Reports the pair currently being processed.
Prints a warning if the number of COEs generated by any pair of legs exceed
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 users
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.
Wessel, P. XOVER: A Cross-over Error Detector for Track Data,
Computers & Geosciences, 15, 333-346.
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