NAME

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


SYNOPSIS

      gmtlist leg-ids [ -Ccorrectionfile ] [ -Dastartdate ] [ -Dbstopdate ] [
      -Fflags ] [ -G ] [ -H ] [ -Rwest/east/south/north ] [ -Sastartdist ] [
      -Sbstopdist ] [ -V ] [ -Wweight ] [ -b ]


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 GMT is substituted for gmt, only records that have that
           combination of data are written out. If s is followed by c
           (calender), 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.

      -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 calender
           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 -Da6/3/1971/20:45 -Sb5000 -Fdhgt -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, try:

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


SEE ALSO

      gmt, xsystem


REFERENCES

      Wessel, P., and W. H. F. Smith, 1999, The Generic Mapping Tools (GMT)
      version 3.2 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.








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