NAME
mgd77track - A shiptrack plotting program
SYNOPSIS
mgd77track leg-ids -Rwest/east/south/north -Jparameters [ -A[c][size] ]
[ -Btickinfo ] [ -Dastartdate ] [ -Dbstopdate ] [ -K ] [ -Mtrackticks ]
[ -O ] [ -P ] [ -Sastartdist ] [ -Sbstopdist ] [
-TT|t|dms,mc,mfs,mf,mfc ] [ -U[dx/dy/][label] ] [ -V ] [ -Wpen ] [
-Xx-shift ] [ -Yy-shift ] [ -ccopies ]
DESCRIPTION
mgd77track reads NGDC MGD-77 cruises and creates PostScript code that
will plot one or more ship tracks on a map using the specified projec-
tion. The PostScript code is written to standard output.
leg-ids
Can be one or more NGDC names, like 01010007 etc.
-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 setting in .gmtdefaults4, but this
can be overridden on the command line by appending c, i, or m to
the scale/width value. For map height, max dimension, or min
dimension, append h, +, or - to the width, respectively.
CYLINDRICAL PROJECTIONS:
-Jclon0/lat0/scale (Cassini)
-Jjlon0/scale (Miller)
-Jmscale (Mercator - Greenwich and Equator as origin)
-Jmlon0/lat0/scale (Mercator - Give meridian and standard paral-
lel)
-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 Car-
ree))
-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/[slat/]scale (General Stereographic)
CONIC PROJECTIONS:
-Jblon0/lat0/lat1/lat2/scale (Albers)
-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]][d] (Linear, log, and power
scaling)
More details can be found in the psbasemap man pages.
-R xmin, xmax, ymin, and ymax specify the Region of interest. For
geographic regions, these limits correspond to west, east,
south, and north 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 wesn. The
two shorthands -Rg -Rd stand for global domain (0/360 or
-180/+180 in longitude respectively, with -90/+90 in latitude).
For calendar time coordinates you may either give relative time
(relative to the selected TIME_EPOCH and in the selected
TIME_UNIT; append t to -JX|x), or absolute time of the form
[date]T[clock] (append T to -JX|x). At least one of date and
clock must be present; the T is always required. The date string
must be of the form [-]yyyy[-mm[-dd]] (Gregorian calendar) or
yyyy[-Www[-d]] (ISO week calendar), while the clock string must
be of the form hh:mm:ss[.xxx]. The use of delimiters and their
type and positions must be as indicated (however, input/output
and plotting formats are flexible).
OPTIONS
No space between the option flag and the associated arguments.
-A Annotate each leg every time it enters the plot. Append c to
annotate using the MGD77 cruise ID [Default uses the filename
prefix]. Optional size is the font size in points. The leg
annotation font is controlled by LABEL_FONT.
-B Sets map boundary annotation and tickmark intervals; see the
psbasemap man page for all the details.
-Da Do not plot data collected before startdate (yyyy-mm-
ddT[hh:mm:ss]) [Default is first day].
-Db Do not plot data collected after stopdate (yyyy-mm-
ddT[hh:mm:ss]). [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. Alternatively you may use the modi-
fiers d (days) and n (nautical miles).
-O Selects Overlay plot mode [Default initializes a new plot sys-
tem].
-T Controlls the attributes of the three kinds of markers (T for
the first time marker in a new day, t for additional time mark-
ers in the same day, and d for distance markers). For each of
these you can specify the 5 comma-separated attributes marker-
size, markercolor, markerfontsize, markerfont, and markerconf-
color. Repeat the -T option for each marker type.
-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.). The GMT parameters
UNIX_TIME and UNIX_TIME_POS can affect the appearance; see the
gmtdefaults man page for details.
-W pen is the pne used for the trackline. [Default is 0.25p,black].
[Default is solid].
-X -Y Shift origin of plot by (x-shift,y-shift). Prepend a for abso-
lute coordinates; the default (r) will reset plot origin. Give
c to center plot using current page size.
-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 the cruise 01010007 in the
area 70W to 20E, 40S to 20N, using a Mercator scale of 0.1inch/degree,
label the tracks with 10 points characters, annotate the boundaries
every 10 degrees, draw gridlines every 5 degrees, and mark the track
every day and 1000 km, with ticks every 6 hours and 250 km, and send
the plot to the default printer, enter the following command:
mgd77track 01010007 -R70W/20E/40S/20N -Jm0.1 -B10g5 -A10
-Ma1da1000kf6hf250k | lpr
SEE ALSO
mgd77info(GMTMANSECTION), psbasemap(GMTMANSECTION) mgd77list(GMTMANSEC-
TION)
REFERENCES
Wessel, P., and W. H. F. Smith, 2004, The Generic Mapping Tools (GMT)
version 4 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 Map-
ping Tools Released, EOS Trans., AGU, 76 (33), p. 329.
Wessel, P., and W. H. F. Smith, 1995, New Version of the Generic Map-
ping Tools Released, http: American Geophysical Union.
Wessel, P., and W. H. F. Smith, 1991, Free Software Helps Map and Dis-
play Data, EOS Trans., AGU, 72 (41), p. 441.
Man(1) output converted with
man2html