01-31-2019
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LEARN ABOUT DEBIAN
x_list
X_LIST(1gmt) Generic Mapping Tools X_LIST(1gmt)
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 4.5.7 15 Jul 2011 X_LIST(1gmt)