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GMTLIST(1)                   Generic Mapping Tools                  GMTLIST(1)


NAME

       gmtlist - A data-extractor for <legid>.gmt files


SYNOPSIS

       gmtlist leg-ids [ -Ccorrectionfile ] [ -Dastartdate ] [ -Dbstopdate ] [
       -Fflags ] [ -G ] [ -H[i][nrec] ] [ -Rwest/east/south/north[r] ] [
       -Sastartdist ] [ -Sbstopdist ] [ -V ] [ -Wweight ] [
       -bo[s|S|d|D[ncol]|c[var1/...]] ]


DESCRIPTION

       gmtlist reads <legid>.gmt files and produces an ASCII [or binary]
       table.  The <legid>.gmt files contain time(s), latitude(y),
       longitude(x), gravity(g/G), magnetics(m/M), and bathymetry(t/T), and
       the user may extract any combination of these 6 parameters +
       distance(d), heading (h), velocity (v), and weight (w, see -W).  A sub-
       section can be specified by passing time- or distance-intervals along
       track or by selecting a region.

       leg-ids
              Can be one or more cruisenames. To give a list of names, use
              `cat list_of_legs`.


OPTIONS

       No space between the option flag and the associated arguments

       -C     Apply crossover Corrections to the data. If no correction file
              is given, gmtlist reads the default correction file. (See
              XSYSTEM for how to set up your own correction file).

       -Da    Do not list data collected before startdate (mm/dd/yyyy/hh:mm)
              [Default is first day].

       -Db    Do not list data collected after stopdate (mm/dd/yyyy/hh:mm).
              [Default is last day].

       -F     Can be any combination of syxgmtdhv to indicate the desired
              output data. The data will appear in the order indicated by
              flags. If G, M, or T is substituted for g, m, t, only records
              that have that combination of data are written out. If s is
              followed by c (calendar), then yyyy/mm/dd/hh/mm/ss is written
              out, if s is followed by j (julian), then yyyy/jd/hh/mm/ss is
              written out.  Default is seconds from start of year.

       -G     Force Geographical longitudes (-180/+180) rather than geodetic
              (0-360) [Default].

       -H     Issue a header record with names for each data field.

       -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, specify the name of an existing grid file and the
              -R settings (and grid spacing, if applicable) are copied from
              the grid.

       -Sa    Do not list data that are less than startdist km along track
              from port of departure. [Default is 0].

       -Sb    Do not list data that are more than stopdist km along track from
              port of departure. [Default is length of track].

       -V     Selects verbose mode, which will send progress reports to stderr
              [Default runs "silently"].

       -W     Set the weight for these data.  Weight output option must be set
              in -F.  This is useful if the data are to be processed with the
              weighted averaging techniques offered by blockmean, blockmedian,
              and blockmode.

       -b     Selects binary output mode (in double precision) [Default is
              ASCII].  -H is ignored if -b is selected.  Julian and calendar
              dates are not supported for binary time output (i.e., you get
              seconds from start of year).


EXAMPLES

       To get a (distance, heading, crossover-corrected gravity, bathymetry)
       listing from c2104.gmt, starting at June 3 1971 20:45 and ending at
       distance = 5000 km, use the following command:

       gmtlist c2104 -Da 6/3/1971/20:45 -Sb 5000 -F dhgt -C > myfile

       To make input for blockmean and surface using all the cruises listed in
       the file gmt.list, but only the data that are inside the specified
       area, and make output binary:

       gmtlist `cat gmt.list` -F xyg -R-40/-30/25/35 -b > allgrav.xyg


SEE ALSO

       GMT(1), x_system(1)


REFERENCES

       Wessel, P., and W. H. F. Smith, 2015, The Generic Mapping Tools (GMT)
       version 4.5.14 Technical Reference & Cookbook, SOEST/NOAA.
       Wessel, P., and W. H. F. Smith, 1998, New, Improved Version of Generic
       Mapping Tools Released, EOS Trans., AGU, 79 (47), p. 579.
       Wessel, P., and W. H. F. Smith, 1995, New Version of the Generic
       Mapping Tools Released, EOS Trans., AGU, 76 (33), p. 329.
       Wessel, P., and W. H. F. Smith, 1995, New Version of the Generic
       Mapping Tools Released, http://www.agu.org/eos_elec/95154e.html,
       Copyright 1995 by the American Geophysical Union.
       Wessel, P., and W. H. F. Smith, 1991, Free Software Helps Map and
       Display Data, EOS Trans., AGU, 72 (41), p. 441.

GMT 4.5.14                        1 Nov 2015                        GMTLIST(1)

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