MGD77TRACK(1) Generic Mapping Tools MGD77TRACK(1)NAMEmgd77track - A shiptrack plotting program
SYNOPSISmgd77track NGDC-ids -Rwest/east/south/north[r] -Jparameters [
-A[c][size][,spacing] ] [ -B[p|s]parameters ] [ -Cf|g|e ] [ -Dastart‐
date ] [ -Dbstopdate ] [ -F ] [ -Gd|tgap ] [ -Iignore ] [ -K ] [
-Ltrackticks ] [ -O ] [ -P ] [ -Sastartdist[u] ] [ -Sbstopdist[u] ] [
-TT|t|dms,mc,mfs,mf,mfc ] [ -U[just/dx/dy/][c|label] ] [ -V ] [ -Wpen ]
[ -X[a|c|r][x-shift[u]] ] [ -Y[a|c|r][y-shift[u]] ] [ -ccopies ]
DESCRIPTIONmgd77track reads NGDC MGD77 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.
NGDC-ids
Can be one or more of five kinds of specifiers:
1) 8-character NGDC IDs, e.g., 01010083, JA010010etc., etc.
2) 2-character <agency> codes which will return all cruises from
each agency.
3) 4-character <agency><vessel> codes, which will return all
cruises from those vessels.
4) =<list>, where <list> is a table with NGDC IDs, one per line.
5) If nothing is specified we return all cruises in the data
base.
(See mgd77info -L for agency and vessel codes). The ".mgd77" or
".nc" extensions will automatically be appended, if needed (use
-I to ignore certain file types). Cruise files will be looked
for first in the current directory and second in all directories
listed in $MGD77_HOME/mgd77_paths.txt [If $MGD77_HOME is not set
it will default to $GMT_SHAREDIR/mgd77].
-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. When central meridian is optional,
default is center of longitude range on -R option. Default
standard parallel is the equator. For map height, max dimen‐
sion, or min dimension, append h, +, or - to the width, respec‐
tively.
More details can be found in the psbasemap man pages.
CYLINDRICAL PROJECTIONS:
-Jclon0/lat0/scale (Cassini)
-Jcyl_stere/[lon0/[lat0/]]scale (Cylindrical Stereographic)
-Jj[lon0/]scale (Miller)
-Jm[lon0/[lat0/]]scale (Mercator)
-Jmlon0/lat0/scale (Mercator - Give meridian and standard paral‐
lel)
-Jo[a]lon0/lat0/azimuth/scale (Oblique Mercator - point and
azimuth)
-Jo[b]lon0/lat0/lon1/lat1/scale (Oblique Mercator - two points)
-Joclon0/lat0/lonp/latp/scale (Oblique Mercator - point and
pole)
-Jq[lon0/[lat0/]]scale (Cylindrical Equidistant)
-Jtlon0/[lat0/]scale (TM - Transverse Mercator)
-Juzone/scale (UTM - Universal Transverse Mercator)
-Jy[lon0/[lat0/]]scale (Cylindrical Equal-Area)
CONIC PROJECTIONS:
-Jblon0/lat0/lat1/lat2/scale (Albers)
-Jdlon0/lat0/lat1/lat2/scale (Conic Equidistant)
-Jllon0/lat0/lat1/lat2/scale (Lambert Conic Conformal)
-Jpoly/[lon0/[lat0/]]scale ((American) Polyconic)
AZIMUTHAL PROJECTIONS:
-Jalon0/lat0[/horizon]/scale (Lambert Azimuthal Equal-Area)
-Jelon0/lat0[/horizon]/scale (Azimuthal Equidistant)
-Jflon0/lat0[/horizon]/scale (Gnomonic)
-Jglon0/lat0[/horizon]/scale (Orthographic)
-Jglon0/lat0/altitude/azimuth/tilt/twist/Width/Height/scale
(General Perspective).
-Jslon0/lat0[/horizon]/scale (General Stereographic)
MISCELLANEOUS PROJECTIONS:
-Jh[lon0/]scale (Hammer)
-Ji[lon0/]scale (Sinusoidal)
-Jkf[lon0/]scale (Eckert IV)
-Jk[s][lon0/]scale (Eckert VI)
-Jn[lon0/]scale (Robinson)
-Jr[lon0/]scale (Winkel Tripel)
-Jv[lon0/]scale (Van der Grinten)
-Jw[lon0/]scale (Mollweide)
NON-GEOGRAPHICAL PROJECTIONS:
-Jp[a]scale[/origin][r|z] (Polar coordinates (theta,r))
-Jxx-scale[d|l|ppow|t|T][/y-scale[d|l|ppow|t|T]] (Linear, log,
and power scaling)
-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.
OPTIONS
No space between the option flag and the associated arguments.
-A 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. By
default, each leg is annotated every time it enters the map
region. Alternatively, append ,spacing to place this label every
spacing units apart along the track. Append one of the units k
(km), n (nautical mile), d (day), or h (hour).
-B Sets map boundary annotation and tickmark intervals; see the
psbasemap man page for all the details.
-C Select procedure for along-track distance calculation:
f Flat Earth distances.
g Great circle distances [Default].
e Geodesic distances on current GMT ellipsoid.
-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].
-F Do not apply the error bit flags if present in a MGD77+ file
[Default will apply these flags upon reading the data].
-G Let successive point separations exceeding dgap (km) or tgap
(minutes) indicate a break in the track where we should not draw
a line [no gaps recognized]. Repeat to use both types of gap
checking.
-I Ignore certain data file formats from consideration. Append
a|c|m|t to ignore MGD77 ASCII, MGD77+ netCDF, MGD77T ASCII or
plain tab-separated ASCII table files, respectively. The option
may be repeated to ignore more than one format. [Default
ignores none].
-K More PostScript code will be appended later [Default terminates
the plot system].
-L To put time/distance log-marks on the track. E.g. a500ka24ht6h
means (a)nnotate every 500 km (k) and 24 h(ours), with (t)ick‐
marks every 500 km and 6 hours. Alternatively you may use the
modifiers d (days) and n (nautical miles).
-O Selects Overlay plot mode [Default initializes a new plot sys‐
tem].
-P Selects Portrait plotting mode [Default is Landscape, see gmtde‐
faults to change this].
-Sa Do not plot data that are less than startdist meter along track
from port of departure. Append k for km, m for miles, or n for
nautical miles [Default is 0 meters].
-Sb Do not plot data that are more than stopdist meter along track
from port of departure. Append k for km, m for miles, or n for
nautical miles [Default is end of track].
-T Controls the attributes of the three kinds of markers (T for the
first time marker in a new day, t for additional time markers in
the same day, and d for distance markers). For each of these
you can specify the 5 comma-separated attributes markersize,
markercolor, markerfontsize, markerfont, and markerfontcolor.
Repeat the -T option for each marker type.
-U Draw Unix System time stamp on plot. By adding just/dx/dy/, the
user may specify the justification of the stamp and where the
stamp should fall on the page relative to lower left corner of
the plot. For example, BL/0/0 will align the lower left corner
of the time stamp with the lower left corner of the plot.
Optionally, append a label, or c (which will plot the command
string.). The GMT parameters UNIX_TIME, UNIX_TIME_POS, and
UNIX_TIME_FORMAT can affect the appearance; see the gmtdefaults
man page for details. The time string will be in the locale set
by the environment variable TZ (generally local time).
-W Append pen used for the trackline. [Default is 0.25p,black].
[Default is solid].
-X -Y Shift plot origin relative to the current origin by (x-shift,y-
shift) and optionally append the length unit (c, i, m, p). You
can prepend a to shift the origin back to the original position
after plotting, or prepend r [Default] to reset the current
origin to the new location. If -O is used then the default (x-
shift,y-shift) is (0,0), otherwise it is (r1i, r1i) or (r2.5c,
r2.5c). Alternatively, give c to align the center coordinate (x
or y) of the plot with the center of the page based on 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 -R 70W/20E/40S/20N -Jm 0.1 -B 10g5 -A 10 -L
a1da1000kf6hf250k | lpr
SEE ALSOmgd77info(1), psbasemap(1)mgd77list(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 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://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 Dis‐
play Data, EOS Trans., AGU, 72 (41), p. 441.
The Marine Geophysical Data Exchange Format - "MGD77", see
http://www.ngdc.noaa.gov/mgg/dat/geodas/docs/mgd77.txt
GMT 4.5.14 1 Nov 2015 MGD77TRACK(1)
