NAME
XLIST - To extract Cross-Over Information from the Data
Base.
SYNOPSIS
xlist [ leg1 ] [ leg2 ] [ -dataflags ] [
-Rwest/east/south/north ] [ -Xxbase ] [ -H ] [ -I ] [ -V ] [
-Ccorrfile ] [ -Zignorefile ]
DESCRIPTION
xlist 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 parame-
ters 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 Operate in verbose mode.
SEE ALSO
gmt(l), x_system(l)
REFERENCES
Wessel, P. XOVER: A Cross-over Error Detector for Track
Data, Computers & Geosciences, 15, 333-346.