1MGD77TRACK(1) Generic Mapping Tools MGD77TRACK(1)
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6 mgd77track - A shiptrack plotting program
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9 mgd77track NGDC-ids -Rwest/east/south/north[r] -Jparameters [
10 -A[c][size][,spacing] ] [ -B[p|s]parameters ] [ -Cf|g|e ] [ -Dastart‐
11 date ] [ -Dbstopdate ] [ -F ] [ -Gd|tgap ] [ -Iignore ] [ -K ] [
12 -Ltrackticks ] [ -O ] [ -P ] [ -Sastartdist[u] ] [ -Sbstopdist[u] ] [
13 -TT|t|dms,mc,mfs,mf,mfc ] [ -U[just/dx/dy/][c|label] ] [ -V ] [ -Wpen ]
14 [ -X[a|c|r][x-shift[u]] ] [ -Y[a|c|r][y-shift[u]] ] [ -ccopies ]
15
17 mgd77track reads NGDC MGD77 cruises and creates PostScript code that
18 will plot one or more ship tracks on a map using the specified projec‐
19 tion. The PostScript code is written to standard output.
20 NGDC-ids
22 Can be one or more of five kinds of specifiers:
23 1) 8-character NGDC IDs, e.g., 01010083, JA010010etc., etc.
24 2) 2-character <agency> codes which will return all cruises from
25 each agency.
26 3) 4-character <agency><vessel> codes, which will return all
27 cruises from those vessels.
28 4) =<list>, where <list> is a table with NGDC IDs, one per line.
29 5) If nothing is specified we return all cruises in the data
30 base.
31 (See mgd77info -L for agency and vessel codes). The ".mgd77" or
32 ".nc" extensions will automatically be appended, if needed (use
33 -I to ignore certain file types). Cruise files will be looked
34 for first in the current directory and second in all directories
35 listed in $MGD77_HOME/mgd77_paths.txt [If $MGD77_HOME is not set
36 it will default to $GMT_SHAREDIR/mgd77].
37 -J Selects the map projection. Scale is UNIT/degree, 1:xxxxx, or
39 width in UNIT (upper case modifier). UNIT is cm, inch, or m,
40 depending on the MEASURE_UNIT setting in .gmtdefaults4, but this
41 can be overridden on the command line by appending c, i, or m to
42 the scale/width value. When central meridian is optional,
43 default is center of longitude range on -R option. Default
44 standard parallel is the equator. For map height, max dimen‐
45 sion, or min dimension, append h, +, or - to the width, respec‐
46 tively.
47 More details can be found in the psbasemap man pages.
48 CYLINDRICAL PROJECTIONS:
50 -Jclon0/lat0/scale (Cassini)
52 -Jcyl_stere/[lon0/[lat0/]]scale (Cylindrical Stereographic)
53 -Jj[lon0/]scale (Miller)
54 -Jm[lon0/[lat0/]]scale (Mercator)
55 -Jmlon0/lat0/scale (Mercator - Give meridian and standard paral‐
56 lel)
57 -Jo[a]lon0/lat0/azimuth/scale (Oblique Mercator - point and
58 azimuth)
59 -Jo[b]lon0/lat0/lon1/lat1/scale (Oblique Mercator - two points)
60 -Joclon0/lat0/lonp/latp/scale (Oblique Mercator - point and
61 pole)
62 -Jq[lon0/[lat0/]]scale (Cylindrical Equidistant)
63 -Jtlon0/[lat0/]scale (TM - Transverse Mercator)
64 -Juzone/scale (UTM - Universal Transverse Mercator)
65 -Jy[lon0/[lat0/]]scale (Cylindrical Equal-Area)
66 CONIC PROJECTIONS:
68 -Jblon0/lat0/lat1/lat2/scale (Albers)
70 -Jdlon0/lat0/lat1/lat2/scale (Conic Equidistant)
71 -Jllon0/lat0/lat1/lat2/scale (Lambert Conic Conformal)
72 -Jpoly/[lon0/[lat0/]]scale ((American) Polyconic)
73 AZIMUTHAL PROJECTIONS:
75 -Jalon0/lat0[/horizon]/scale (Lambert Azimuthal Equal-Area)
77 -Jelon0/lat0[/horizon]/scale (Azimuthal Equidistant)
78 -Jflon0/lat0[/horizon]/scale (Gnomonic)
79 -Jglon0/lat0[/horizon]/scale (Orthographic)
80 -Jglon0/lat0/altitude/azimuth/tilt/twist/Width/Height/scale
81 (General Perspective).
82 -Jslon0/lat0[/horizon]/scale (General Stereographic)
83 MISCELLANEOUS PROJECTIONS:
85 -Jh[lon0/]scale (Hammer)
87 -Ji[lon0/]scale (Sinusoidal)
88 -Jkf[lon0/]scale (Eckert IV)
89 -Jk[s][lon0/]scale (Eckert VI)
90 -Jn[lon0/]scale (Robinson)
91 -Jr[lon0/]scale (Winkel Tripel)
92 -Jv[lon0/]scale (Van der Grinten)
93 -Jw[lon0/]scale (Mollweide)
94 NON-GEOGRAPHICAL PROJECTIONS:
96 -Jp[a]scale[/origin][r|z] (Polar coordinates (theta,r))
98 -Jxx-scale[d|l|ppow|t|T][/y-scale[d|l|ppow|t|T]] (Linear, log,
99 and power scaling)
100 -R west, east, south, and north specify the Region of interest, and
102 you may specify them in decimal degrees or in
103 [+-]dd:mm[:ss.xxx][W|E|S|N] format. Append r if lower left and
104 upper right map coordinates are given instead of w/e/s/n. The
105 two shorthands -Rg and -Rd stand for global domain (0/360 and
106 -180/+180 in longitude respectively, with -90/+90 in latitude).
107 Alternatively, specify the name of an existing grid file and the
108 -R settings (and grid spacing, if applicable) are copied from
109 the grid.
110
112 No space between the option flag and the associated arguments.
113 -A Append c to annotate using the MGD77 cruise ID [Default uses the
115 filename prefix]. Optional size is the font size in points.
116 The leg annotation font is controlled by LABEL_FONT. By
117 default, each leg is annotated every time it enters the map
118 region. Alternatively, append ,spacing to place this label every
119 spacing units apart along the track. Append one of the units k
120 (km), n (nautical mile), d (day), or h (hour).
121 -B Sets map boundary annotation and tickmark intervals; see the
123 psbasemap man page for all the details.
124 -C Select procedure for along-track distance calculation:
126 f Flat Earth distances.
127 g Great circle distances [Default].
128 e Geodesic distances on current GMT ellipsoid.
129 -Da Do not plot data collected before startdate (yyyy-mm-
131 ddT[hh:mm:ss]) [Default is first day].
132 -Db Do not plot data collected after stopdate (yyyy-mm-
134 ddT[hh:mm:ss]). [Default is last day].
135 -F Do not apply the error bit flags if present in a MGD77+ file
137 [Default will apply these flags upon reading the data].
138 -G Let successive point separations exceeding dgap (km) or tgap
140 (minutes) indicate a break in the track where we should not draw
141 a line [no gaps recognized]. Repeat to use both types of gap
142 checking.
143 -I Ignore certain data file formats from consideration. Append
145 a|c|t to ignore MGD77 ASCII, MGD77+ netCDF, or plain table
146 files, respectively. The option may be repeated to ignore more
147 than one format. [Default ignores none].
148 -K More PostScript code will be appended later [Default terminates
150 the plot system].
151 -L To put time/distance log-marks on the track. E.g. a500ka24ht6h
153 means (a)nnotate every 500 km (k) and 24 h(ours), with (t)ick‐
154 marks every 500 km and 6 hours. Alternatively you may use the
155 modifiers d (days) and n (nautical miles).
156 -O Selects Overlay plot mode [Default initializes a new plot sys‐
158 tem].
159 -P Selects Portrait plotting mode [Default is Landscape, see gmtde‐
161 faults to change this].
162 -Sa Do not plot data that are less than startdist meter along track
164 from port of departure. Append k for km, m for miles, or n for
165 nautical miles [Default is 0 meters].
166 -Sb Do not plot data that are more than stopdist meter along track
168 from port of departure. Append k for km, m for miles, or n for
169 nautical miles [Default is end of track].
170 -T Controls the attributes of the three kinds of markers (T for the
172 first time marker in a new day, t for additional time markers in
173 the same day, and d for distance markers). For each of these
174 you can specify the 5 comma-separated attributes markersize,
175 markercolor, markerfontsize, markerfont, and markerfontcolor.
176 Repeat the -T option for each marker type.
177 -U Draw Unix System time stamp on plot. By adding just/dx/dy/, the
179 user may specify the justification of the stamp and where the
180 stamp should fall on the page relative to lower left corner of
181 the plot. For example, BL/0/0 will align the lower left corner
182 of the time stamp with the lower left corner of the plot.
183 Optionally, append a label, or c (which will plot the command
184 string.). The GMT parameters UNIX_TIME, UNIX_TIME_POS, and
185 UNIX_TIME_FORMAT can affect the appearance; see the gmtdefaults
186 man page for details. The time string will be in the locale set
187 by the environment variable TZ (generally local time).
188 -W Append pen used for the trackline. [Default is 0.25p,black].
190 [Default is solid].
191 -X -Y Shift plot origin relative to the current origin by (x-shift,y-
193 shift) and optionally append the length unit (c, i, m, p). You
194 can prepend a to shift the origin back to the original position
195 after plotting, or prepend r [Default] to reset the current
196 origin to the new location. If -O is used then the default (x-
197 shift,y-shift) is (0,0), otherwise it is (r1i, r1i) or (r2.5c,
198 r2.5c). Alternatively, give c to align the center coordinate (x
199 or y) of the plot with the center of the page based on current
200 page size.
201 -V Selects verbose mode, which will send progress reports to stderr
203 [Default runs "silently"].
204 -c Specifies the number of plot copies. [Default is 1].
206
208 To generate a Mercator plot of the track of the cruise 01010007 in the
209 area 70W to 20E, 40S to 20N, using a Mercator scale of 0.1inch/degree,
210 label the tracks with 10 points characters, annotate the boundaries
211 every 10 degrees, draw gridlines every 5 degrees, and mark the track
212 every day and 1000 km, with ticks every 6 hours and 250 km, and send
213 the plot to the default printer, enter the following command:
214 mgd77track 01010007 -R70W/20E/40S/20N -Jm0.1 -B10g5 -A10
216 -La1da1000kf6hf250k | lpr
217
219 mgd77info(1), psbasemap(1) mgd77list(1)
220
222 Wessel, P., and W. H. F. Smith, 2009, The Generic Mapping Tools (GMT)
223 version 4.5.0 Technical Reference & Cookbook, SOEST/NOAA.
224 Wessel, P., and W. H. F. Smith, 1998, New, Improved Version of Generic
225 Mapping Tools Released, EOS Trans., AGU, 79 (47), p. 579.
226 Wessel, P., and W. H. F. Smith, 1995, New Version of the Generic Map‐
227 ping Tools Released, EOS Trans., AGU, 76 (33), p. 329.
228 Wessel, P., and W. H. F. Smith, 1995, New Version of the Generic Map‐
229 ping Tools Released, http://www.agu.org/eos_elec/95154e.html, Copyright
230 1995 by the American Geophysical Union.
231 Wessel, P., and W. H. F. Smith, 1991, Free Software Helps Map and Dis‐
232 play Data, EOS Trans., AGU, 72 (41), p. 441.
233 The Marine Geophysical Data Exchange Format - "MGD77", see
234 http://www.ngdc.noaa.gov/mgg/dat/geodas/docs/mgd77.txt
235GMT 4.5.6 10 Mar 2011 MGD77TRACK(1)