X2SYS_GET(1gmt) 					       Generic Mapping Tools						   X2SYS_GET(1gmt)

NAME

       x2sys_get - Get track listing from the x2sys track index databases

SYNOPSIS

       BD(x2sys_get) -TIT(TAG) [ -C ] [ -D ] [ -E ] [ -FIT(flags) ] [ -L[IT(list)] ] [ -NIT(flags) ] [ -Qe|BD(i) ]  [ -Rwest/east/south/north[r] ]
       [ -V ] ]

DESCRIPTION

       BD(x2sys_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 coordinates 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  possi-
	      ble  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).  Alterna-
	      tively,  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 spec-
	      ified 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

       BD(x2sys_get) -V -TMGD77 -R180/240/-60/-30 -Ffaa,depth

       To find all the tracks associated with the tag MGD77 that have depth but not twt, try

       BD(x2sys_get) -V -TMGD77 -Fdepth -Ntwt

       To find all the pairs associated with the tag MGD77 that might intersect each other, but only those pairs which	involves  tracks  in  your
       list new.lis, try

       BD(x2sys_get) -V -TMGD77 -Lnew.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 ALSO

       x2sys_binlist(1), x2sys_cross(1), x2sys_datalist(1), x2sys_init(1), x2sys_list(1), x2sys_put(1), x2sys_report(1), x2sys_solve(1)

GMT 4.5.7							    15 Jul 2011 						   X2SYS_GET(1gmt)