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] ] [ -B[p|s]parameters ] [ -C|g|e ] [ -Dastartdate ] [
11 -Dbstopdate ] [ -F ] [ -Iignore ] [ -K ] [ -Ltrackticks ] [ -O ] [ -P ]
12 [ -Sastartdist[u] ] [ -Sbstopdist[u] ] [ -TT|t|dms,mc,mfs,mf,mfc ] [
13 -U[just/dx/dy/][c|label] ] [ -V ] [ -Wpen ] [ -X[a|c|r][x-shift[u]] ] [
14 -Y[a|c|r][y-shift[u]] ] [ -ccopies ]
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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 -F 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 AZIMUTHAL PROJECTIONS:
74 -Jalon0/lat0[/horizon]/scale (Lambert Azimuthal Equal-Area)
76 -Jelon0/lat0[/horizon]/scale (Azimuthal Equidistant)
77 -Jflon0/lat0[/horizon]/scale (Gnomonic)
78 -Jglon0/lat0[/horizon]/scale (Orthographic)
79 -Jglon0/lat0/altitude/azimuth/tilt/twist/Width/Height/scale
80 (General Perspective).
81 -Jslon0/lat0[/horizon][/slat]/scale (General Stereographic)
82 MISCELLANEOUS PROJECTIONS:
84 -Jh[lon0/]scale (Hammer)
86 -Ji[lon0/]scale (Sinusoidal)
87 -Jkf[lon0/]scale (Eckert IV)
88 -Jk[s][lon0/]scale (Eckert IV)
89 -Jn[lon0/]scale (Robinson)
90 -Jr[lon0/]scale (Winkel Tripel)
91 -Jv[lon0/]scale (Van der Grinten)
92 -Jw[lon0/]scale (Mollweide)
93 NON-GEOGRAPHICAL PROJECTIONS:
95 -Jp[a]scale[/origin][r|z] (Polar coordinates (theta,r))
97 -Jxx-scale[d|l|ppow|t|T][/y-scale[d|l|ppow|t|T]] (Linear, log,
98 and power scaling)
99 -R west, east, south, and north specify the Region of interest, and
101 you may specify them in decimal degrees or in
102 [+-]dd:mm[:ss.xxx][W|E|S|N] format. Append r if lower left and
103 upper right map coordinates are given instead of w/e/s/n. The
104 two shorthands -Rg and -Rd stand for global domain (0/360 and
105 -180/+180 in longitude respectively, with -90/+90 in latitude).
106
108 No space between the option flag and the associated arguments.
109 -A Annotate each leg every time it enters the plot. Append c to
111 annotate using the MGD77 cruise ID [Default uses the filename
112 prefix]. Optional size is the font size in points. The leg
113 annotation font is controlled by LABEL_FONT.
114 -B Sets map boundary annotation and tickmark intervals; see the
116 psbasemap man page for all the details.
117 -C Select procedure for along-track distance calculation:
119 f Flat Earth distances.
120 g Great circle distances [Default].
121 e Geodesic distances on current GMT ellipsoid.
122 -Da Do not plot data collected before startdate (yyyy-mm-
124 ddT[hh:mm:ss]) [Default is first day].
125 -Db Do not plot data collected after stopdate (yyyy-mm-
127 ddT[hh:mm:ss]). [Default is last day].
128 -F Do not apply the error bit flags if present in a MGD77+ file
130 [Default will apply these flags upon reading the data].
131 -I Ignore certain data file formats from consideration. Append
133 a|c|t to ignore MGD77 ASCII, MGD77+ netCDF, or plain table
134 files, respectively. The option may be repreated to ignore more
135 than one format. [Default ignores none].
136 -K More PostScript code will be appended later [Default terminates
138 the plot system].
139 -L To put time/distance log-marks on the track. E.g. a500ka24ht6h
141 means (a)nnotate every 500 km (k) and 24 h(ours), with (t)ick‐
142 marks every 500 km and 6 hours. Alternatively you may use the
143 modifiers d (days) and n (nautical miles).
144 -O Selects Overlay plot mode [Default initializes a new plot sys‐
146 tem].
147 -P Selects Portrait plotting mode [Default is Landscape, see gmtde‐
149 faults to change this].
150 -Sa Do not plot data that are less than startdist meter along track
152 from port of departure. Append k for km, m for miles, or n for
153 nautical miles [Default is 0 meters].
154 -Sb Do not plot data that are more than stopdist meter along track
156 from port of departure. Append k for km, m for miles, or n for
157 nautical miles [Default is end of track].
158 -T Controlls the attributes of the three kinds of markers (T for
160 the first time marker in a new day, t for additional time mark‐
161 ers in the same day, and d for distance markers). For each of
162 these you can specify the 5 comma-separated attributes marker‐
163 size, markercolor, markerfontsize, markerfont, and markerfont‐
164 color. Repeat the -T option for each marker type.
165 -U Draw Unix System time stamp on plot. By adding just/dx/dy/, the
167 user may specify the justification of the stamp and where the
168 stamp should fall on the page relative to lower left corner of
169 the plot. For example, BL/0/0 will align the lower left corner
170 of the time stamp with the lower left corner of the plot.
171 Optionally, append a label, or c (which will plot the command
172 string.). The GMT parameters UNIX_TIME, UNIX_TIME_POS, and
173 UNIX_TIME_FORMAT can affect the appearance; see the gmtdefaults
174 man page for details. The time string will be in the locale set
175 by the environment variable TZ (generally local time).
176 -W Append pen used for the trackline. [Default is 0.25p,black].
178 [Default is solid].
179 -X -Y Shift plot origin relative to the current origin by (x-shift,y-
181 shift) and optionally append the length unit (c, i, m, p). You
182 can prepend a to shift the origin back to the original position
183 after plotting, or prepend r [Default] to reset the current
184 origin to the new location. If -O is used then the default (x-
185 shift,y-shift) is (0,0), otherwise it is (r1i, r1i) or (r2.5c,
186 r2.5c). Alternatively, give c to align the center coordinate (x
187 or y) of the plot with the center of the page based on current
188 page size.
189 -V Selects verbose mode, which will send progress reports to stderr
191 [Default runs "silently"].
192 -c Specifies the number of plot copies. [Default is 1].
194
196 To generate a Mercator plot of the track of the cruise 01010007 in the
197 area 70W to 20E, 40S to 20N, using a Mercator scale of 0.1inch/degree,
198 label the tracks with 10 points characters, annotate the boundaries
199 every 10 degrees, draw gridlines every 5 degrees, and mark the track
200 every day and 1000 km, with ticks every 6 hours and 250 km, and send
201 the plot to the default printer, enter the following command:
202 mgd77track 01010007 -R70W/20E/40S/20N -Jm0.1 -B10g5 -A10
204 -La1da1000kf6hf250k | lpr
205
207 mgd77info(1), psbasemap(1) mgd77list(1)
208
210 Wessel, P., and W. H. F. Smith, 2005, The Generic Mapping Tools (GMT)
211 version 4.1 Technical Reference & Cookbook, SOEST/NOAA.
212 Wessel, P., and W. H. F. Smith, 1998, New, Improved Version of Generic
213 Mapping Tools Released, EOS Trans., AGU, 79 (47), p. 579.
214 Wessel, P., and W. H. F. Smith, 1995, New Version of the Generic Map‐
215 ping Tools Released, EOS Trans., AGU, 76 (33), p. 329.
216 Wessel, P., and W. H. F. Smith, 1995, New Version of the Generic Map‐
217 ping Tools Released, http://www.agu.org/eos_elec/95154e.html, Copyright
218 1995 by the American Geophysical Union.
219 Wessel, P., and W. H. F. Smith, 1991, Free Software Helps Map and Dis‐
220 play Data, EOS Trans., AGU, 72 (41), p. 441.
221 The Marine Geophysical Data Exchange Format - "MGD77", see
222 http://www.ngdc.noaa.gov/mgg/dat/geodas/docs/mgd77.txt
223GMT 4.3.1 15 May 2008 MGD77TRACK(1)