bionic (1) x2sys_get.1gmt.gz

Provided by: gmt-common_5.4.3+dfsg-1_all bug

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


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