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.