x_list (1) - Linux Manuals

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


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


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


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.
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.
Only return cross-overs inside the specified region west, east, south, and north. [Default is world].
Indicate alternate xx_base.b file.
Issue one header record on output.
Report on internal COEs [Default is external COEs].
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.
Ignore those legs that appear in the ignorefile.
Selects verbose mode, which will send progress reports to stderr [Default runs "silently"].


Wessel, P. XOVER: A Cross-over Error Detector for Track Data, Computers & Geosciences, 15, 333-346.


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