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X_LIST(1)                    Generic Mapping Tools                   X_LIST(1)

NAME
       x_list - Extract Cross-Over Information from the Data Base.

SYNOPSIS
       x_list [ leg1 ] [ leg2 ] [ -dataflags ] [ -Rwest/east/south/north ] [
       -Xxbase ] [ -H ] [ -I ] [ -V ] [ -Ccorrfile ] [ -Zignorefile ]

DESCRIPTION
       x_list will allow the user to extract information from the xx_base.b
       and xx_legs.b files.  Several options can be passed on the command line
       in order to specify which parameters to extract. They are:

       leg1 leg2
              If two legs are specified, the cross-overs they have in common
              are returned.  If one leg is specified, all the external cross-
              overs involving this leg are returned, OR only its internal
              cross-overs if -I is selected.  If no legs are given, all the
              external (or internal with -I) cross-overs are returned.  This
              program is useful if one wants to look at, say, gravity COEs
              versus time from port for a particular leg, etc.

       dataflags
              This is a string of any combination of the following:
                   l means list both legnames.
                   t means list time.
                   x means list longitude.
                   y means list latitude.
                   g means list gravity COEs.
                   m means list magnetics COEs.
                   b means list bathymetry COEs.
                   G means list average gravity at cross-over.
                   M means list average magnetic anomaly at cross-over.
                   B means list average bathymetry at cross-over.
                   h means list heading of ship at cross-over.
              The components are written out in the order they appear in
              dataflags. The default output is -txygmbGMBhl.  When internal
              COEs are desired, the time reported is the elapsed time since
              the ship first occupied the cross-over point. For external COEs
              the time means time from the start of the year in seconds.

       -R     Only return cross-overs inside the specified region west, east,
              south, and north.  [Default is world].

       -X     Indicate alternate xx_base.b file.

       -H     Issue one header record on output.

       -I     Report on internal COEs [Default is external COEs].

       -C     Apply cross-over correction to the data (i.e., reports the
              cross-over value after the best-fitting corrections have been
              applied to both legs). If no corrfile is given, the default
              correction file is assumed.

       -Z     Ignore those legs that appear in the ignorefile.

       -V     Selects verbose mode, which will send progress reports to stderr
              [Default runs "silently"].

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_LIST(1)