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’sresponsibility 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.
