xenial (1) x2sys_get.1gmt.gz

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