X2SYS_GET(1) Generic Mapping Tools X2SYS_GET(1)NAMEx2sys_get - Get track listing from the x2sys track index databases
SYNOPSISx2sys_get-TTAG [ -C ] [ -D ] [ -E ] [ -Fflags ] [ -L[list] ] [ -Nflags
] [ -Qe|i ] [ -Rwest/east/south/north[r] ] [ -V ] ]
DESCRIPTIONx2sys_get will return the names of the track data files in the x2sys
data base for this TAG that match the given requirements. You may
choose a specific region and optionally ask only for tracks that meet
certain data criteria. Finally, you may select an option to list all
possible pairs that might generate crossovers.
-T Specify the x2sys TAG which tracks the attributes of this data
type.
OPTIONS
No space between the option flag and the associated arguments.
-C Instead of reporting the track names, just output the coordi‐
nates of the center of each bin that has at least one track with
the specified data.
-D Only report the track names [Default adds the availability of
data for each field].
-E Append the file extension to all reported tracks [no extension].
-F Give a comma-separated list of column names (as described in the
definition file) that should all be present within the selected
region. [Default selects all data columns]. A track will be
included in the returned list if at least one bin reports that
the track has all of the listed columns.
-L Crossover mode. Return a list of track pairs that should be
checked for possible crossovers. The list is determined from
the bin-index data base on the assumption that tracks occupying
the same bin are very likely to intersect. By default we return
all possible pairs in the data base. Append the name of a file
with a list of tracks if you want to limit the output to those
pairs that involve at least one of the track names in your list.
The output is suitable for the -K option in x2sys_cross.
-N Give a comma-separated list of column names (as described in the
definition file) that all must be absent. A track will be
excluded from the returned list if at least one bin reports that
the track some all of the listed columns.
-Q Append e for external COEs only, and i for internal COEs only
[Default is all COEs]. This applies to the crossover setup only
and requires -L.
-R west, east, south, and north specify the Region of interest, and
you may specify them in decimal degrees or in
[+-]dd:mm[:ss.xxx][W|E|S|N] format. Append r if lower left and
upper right map coordinates are given instead of w/e/s/n. The
two shorthands -Rg and -Rd stand for global domain (0/360 and
-180/+180 in longitude respectively, with -90/+90 in latitude).
Alternatively, specify the name of an existing grid file and the
-R settings (and grid spacing, if applicable) are copied from
the grid. For Cartesian data just give xmin/xmax/ymin/ymax.
This option limits the tracks to those that fall at least partly
inside the specified domain.
-V Selects verbose mode, which will send progress reports to stderr
[Default runs "silently"].
EXAMPLES
To find all the tracks associated with the tag MGD77, restricted to
occupy a certain region in the south Pacific, and have at least free
air anomalies and bathymetry, try
x2sys_get-V -T MGD77 -R 180/240/-60/-30 -F faa,depth
To find all the tracks associated with the tag MGD77 that have depth
but not twt, try
x2sys_get-V -T MGD77 -F depth -N twt
To find all the pairs associated with the tag MGD77 that might inter‐
sect each other, but only those pairs which involves tracks in your
list new.lis, try
x2sys_get-V -T MGD77 -L new.lis > xpairs.lis
NOTE
The tracks that are returned all have the requested data (-F) within
the specified region (-R). Furthermore, the columns of Y and N for
other data types also reflect the content of the track portion within
the selected region.
SEE ALSOx2sys_binlist(1), x2sys_cross(1), x2sys_datalist(1), x2sys_init(1),
x2sys_list(1), x2sys_put(1), x2sys_report(1), x2sys_solve(1)GMT 4.5.14 1 Nov 2015 X2SYS_GET(1)
