Provided by: gmt_4.5.11-1build1_amd64
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. 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"].
Wessel, P. XOVER: A Cross-over Error Detector for Track Data, Computers & Geosciences, 15, 333-346.