Ubuntu Manpage: x2sys_get - Get track listing from the x2sys track index databases

Provided by: gmt-common_5.2.1+dfsg-3build1_all

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.

COPYRIGHT

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

5.2.1                                           January 28, 2016                                 X2SYS_GET(1gmt)