NAME

       x2sys_get - Get track listing from the x2sys track index databases

SYNOPSIS

       x2sys_get TAG [  ] [ flags ] [  ] [ [+][list] ] [ flags ] [ [ region ] [ [level] ]

       Note: No space is allowed between the option flag and the associated arguments.

DESCRIPTION

       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.

REQUIRED ARGUMENTS

       -TTAG  Specify the x2sys TAG which tracks the attributes of this data type.

OPTIONAL 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].

       -Fflags
              Give  a  comma-separated list of column names (as described in the definition file)
              that should be present. [Default selects all data columns].

       -G     Report data flags (Y or N) for the entire track rather than just  for  the  portion
              that is inside the region set by -R [Default].

       -L[+][list]
              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  -A  option  in
              x2sys_cross.  By  default,  only  external  crossover  pairs are listed. Use -L+ to
              include internal pairs in the list.

       -Nflags
              Give a comma-separated list of column names (as described in the  definition  file)
              that must be absent.

       -R[unit]west/east/south/north[/zmin/zmax][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 for grid creation, give
              Rcodelon/lat/nx/ny, where code is a 2-character combination of L, C, R  (for  left,
              center,  or right) and T, M, B for top, middle, or bottom. e.g., BL for lower left.
              This indicates which point on a rectangular region the  lon/lat  coordinate  refers
              to,  and  the grid dimensions nx and ny with grid spacings via -I is used to create
              the corresponding region.  Alternatively, specify the name of an existing grid file
              and  the  -R  settings  (and grid spacing, if applicable) are copied from the grid.
              Using -Runit expects projected (Cartesian) coordinates compatible  with  chosen  -J
              and  we  inversely  project to determine actual rectangular geographic region.  For
              perspective view (-p), optionally append /zmin/zmax.  In case of  perspective  view
              (-p),  a z-range (zmin, zmax) can be appended to indicate the third dimension. This
              needs to be done only when using the -Jz option, not when using only the -p option.
              In  the  latter  case  a  perspective  view  of the plane is plotted, with no third
              dimension. 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[level] (more ...)
              Select verbosity level [c].

       -^ or just -
              Print a short message about the syntax of the command, then exits (NOTE: on Windows
              use just -).

       -+ or just +
              Print  an  extensive  usage  (help)  message,  including  the  explanation  of  any
              module-specific option (but not the GMT common options), then exits.

       -? or no arguments
              Print  a  complete usage (help) message, including the explanation of options, then
              exits.

       --version
              Print GMT version and exit.

       --show-datadir
              Print full path to GMT share directory and exit.

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

              gmt 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

              gmt x2sys_get -V -TMGD77 -Fdepth -Nwt

       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

              gmt 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, unless -G is set.

SEE ALSO

       x2sys_binlist,   x2sys_cross   x2sys_datalist,    x2sys_init,    x2sys_list,    x2sys_put,
       x2sys_report, x2sys_solve

COPYRIGHT

       2015, P. Wessel, W. H. F. Smith, R. Scharroo, J. Luis, and F. Wobbe