NAME

       x2sys_get - Get track listing from the x2sys track index databases

SYNOPSIS

       x2sys_get   -TTAG [  -C ] [  -Fflags ] [  -G ] [  -L[+][list] ] [  -Nflags ] [ [  -Rregion
       ] [  -V[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.

       -Rwest/east/south/north[/zmin/zmax][+r][+uunit]
              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.
              Appending  +uunit  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
              just use -).

       -+ 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  all  options,
              then exits.

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

       2018, P. Wessel, W. H. F. Smith, R. Scharroo, J. Luis, and F. Wobbe