1X_UPDATE(1)                  Generic Mapping Tools                 X_UPDATE(1)
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NAME

6       x_update - Archiving of Cross-Over Information
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SYNOPSIS

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

12       x_update  reads the ASCII file produced by x_over and writes the infor‐
13       mation to the database files  xx_base.b  and  xx_legs.b  (unless  other
14       filenames  are  specified  on the command line) using a compact, binary
15       format. The options recognized are:
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17       -X     Indicate alternate xx_base.b file.
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19       -L     Indicate alternate xx_legs.b file.
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21       -V     Verbose. Reports the pair currently being processed.
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23       -W     Prints a warning if the number of COEs generated by any pair  of
24              legs exceed max.
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BEWARE

27       For  security reasons the xx_legs.b are first renamed to xx_legs.b_old,
28       to prevent loss of information if a black-out or  system  crash  should
29       occur  during writing of the new xx_legs.b file. It is recommended that
30       the old file is left on the disk in case of other disasters. Note  that
31       x_update  does  not  check  if  a  pair  of  legs  already exist in the
32       xx_base.b file. It is the user's responsibility to ensure that duplica‐
33       tion  of  information  does not occur. Should some pairs already in the
34       database need to be re-examined, then run x_remove which will wipe  out
35       all  traces of the specified cruises from the x_system data base files.
36       Now  we  can  pass  the  pairs  that  need   to   be   redone   through
37       x_over/x_update again.
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SEE ALSO

40       GMT(1), x_system(1)
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REFERENCES

43       Wessel, P. XOVER: A Cross-over Error Detector for Track Data, Computers
44       & Geosciences, 15, 333-346.
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48GMT 4.3.1                         15 May 2008                      X_UPDATE(1)