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 speci-
fied 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 UNIT/degree,
1:xxxxx, or width in UNIT (upper case modifier). UNIT
is cm, inch, or m, depending on the MEASURE_UNIT set-
ting in .gmtdefaults, but this can be overridden on the
command line by appending the c, i, or m to the
scale/width value.
CYLINDRICAL PROJECTIONS:
-Jclon0/lat0/scale (Cassini)
-Jjlon0/scale (Miller)
-Jmscale (Mercator - Greenwich and Equator as origin)
-Jmlon0/lat0/scale (Mercator - Give meridian and stan-
dard 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 ori-
gin)
-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:
-Jp[a]scale[/origin] (polar (theta,r) coordinates,
optional a for azimuths and offset theta [0])
-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 argu-
ments.
-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.
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 dOt-
ted line, a for dAshed. [Default is solid]
-X -Y
Shift origin of plot by (x-shift,y-shift). 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 Mer-
cator 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(l), psbasemap(l)
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.