## NAME

          gmttrack - A shiptrack plotting program

## SYNOPSIS

          gmttrack leg-ids -Rwest/east/south/north -Jparameters [ -Btickinfo ] [
          -Mtrackticks ] [ -Wpen[red/green/blue][OA] ] [ -A[size] ] [ -P ] [ -O ]
          [ -K ]  [ -U[dx/dy/][label] ] [ -Xx-shift ] [ -Yy-shift ] [ -ccopies ]
          [ -V  ]

## DESCRIPTION

          gmttrack reads gmt cruises and creates PostScript code that will plot
          one or more ship tracks on a map using the specified projection.  The
          PostScript code is written to standard output.

          leg-ids
               Can be one or more gmtleg-names, like c2104 v3206 etc.

          -R   west, east, south, and north specify the Region of interest.  To
               specify boundaries in degrees and minutes [and seconds], use the
               dd:mm[:ss] format.  Append r if lower left and upper right map
               coordinates are given instead of wesn.

          -J   Selects the map projection. Scale is inch/degree, 1:xxxxx, or
               width in inch (upper case modifier).

               CYLINDRICAL PROJECTIONS:

               -Jclon0/lat0/scale (Cassini)
               -Jjlon0/scale (Miller)
               -Jmscale (Mercator - Greenwich and Equator as origin)
               -Jmlon0/lat0/scale (Mercator - Give meridian and standard
               parallel)
               -Joalon0/lat0/azimuth/scale (Oblique Mercator - point and
               azimuth)
               -Joblon0/lat0/lon1/lat1/scale (Oblique Mercator - two points)
               -Joclon0/lat0/lonp/latp/scale (Oblique Mercator - point and pole)
               -Jqlon0/scale (Equidistant Cylindrical Projection (Plate Carree))
               -Jtlon0/scale (TM - Transverse Mercator, with Equator as y = 0)
               -Jtlon0/lat0/scale (TM - Transverse Mercator, set origin)
               -Juzone/scale (UTM - Universal Transverse Mercator)
               -Jylon0/lats/scale (Basic Cylindrical Projection)

               AZIMUTHAL PROJECTIONS:

               -Jalon0/lat0/scale (Lambert).
               -Jelon0/lat0/scale (Equidistant).
               -Jflon0/lat0/horizon/scale (Gnomonic).
               -Jglon0/lat0/scale (Orthographic).
               -Jslon0/lat0/scale (General Stereographic)

               CONIC PROJECTIONS:
               -Jblon0/lat0/lat1/lat2/scale (Albers)
               -Jdlon0/lat0/lat1/lat2/scale (Equidistant)
               -Jllon0/lat0/lat1/lat2/scale (Lambert)

               MISCELLANEOUS PROJECTIONS:

               -Jhlon0/scale (Hammer)
               -Jilon0/scale (Sinusoidal)
               -Jk[f|s]lon0/scale (Eckert IV (f) and VI (s))
               -Jnlon0/scale (Robinson)
               -Jrlon0/scale (Winkel Tripel)
               -Jvlon0/scale (Van der Grinten)
               -Jwlon0/scale (Mollweide)

               NON-GEOGRAPHICAL PROJECTIONS:

               -Jpscale (Linear projection for polar (theta,r) coordinates)
               -Jxx-scale[l|ppow][/y-scale[l|ppow]] (Linear, log, and power
               scaling)
               More details can be found in the psbasemap manpages.

## OPTIONS

          No space between the option flag and the associated arguments.

          -B   Sets map boundary tickmark intervals. See psbasemap for details.

          -A   Annotate each leg every time it enters the plot. Optional size is
               character size in points.

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

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

          -K   More PostScript code will be appended later [Default terminates
               the plot system].

          -M   To put time/distance Marks on the track. E.g. a500ka24ht6h means
               (a)nnotate every 500 km (k) and 24 h(ours), with (t)ickmarks
               every 500 km and 6 hours.

          -O   Selects Overlay plot mode [Default initializes a new plot
               system].

          -P   Selects Portrait plotting mode [GMT Default is Landscape, see
               gmtdefaults to change this].

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

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

          -U   Draw Unix System time stamp on plot.  User may specify where the
               lower left corner of the stamp should fall on the page relative
               to lower left corner of plot in inch [Default is (-0.75i/-
               0.75i)].  Optionally, append a label, or c (which will plot the
               command string.)

          -W   pen is thickness of the trackline. [Default is 1].  Optionally,
               specify the rgb combination to obtain a colored trackline
               [Default is black]. Append O for dOtted line, a for dAshed.
               [Default is solid]

          -X -Y
               Shift origin of plot by (x-shift,y-shift) inch  [Default is
               (a1i,a1i) for new plots, (0,0) for overlays].  Prepend a for
               absolute coordinates; the default (r) will reset plot origin.

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

          -c   Specifies the number of plot copies. [Default is 1]

## EXAMPLES

          To generate a Mercator plot of the track of cruises C2610 and V1512 in
          the area 150E to 154E, 18N to 23N, using a Mercator scale of
          1.5inch/degree, label the tracks with 10 points characters, annotate
          the boundaries every degree, and draw gridlines every 30', enter the
          following command:

          gmttrack c2610 v1512 -R150/154/18/23 -Jm1.5 -B1g30m -A10 | lpr

## SEE ALSO

          gmt, psbasemap

## 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.