mgd77track(1) GMT mgd77track(1)
NAME
mgd77track - Plot track-line map of MGD77 cruises
SYNOPSIS
mgd77track NGDC-ids
-Rregion
-Jparameters [ -A[c][size][,spacing] ] [ -B[p|s]parameters ] [
-Cf|g|e ] [ -Dastartdate ] [ -Dbstopdate ] [ -F ] [ -Gd|t|ngap ] [
-Iignore ] [ -K ] [ -Ltrackticks ] [ -oflags ] [ -pflags ] [ -Sas-
tartdist[u] ] [ -Sbstopdist[u] ] [ -TT|t|dms,mc,mfs,mf,mfc ] [
-U[stamp] ] [ -V[level] ] [ -W[-|+][pen] ] [ -Xx_offset ] [
-Yy_offset ] [ -pflags ] [ -ttransp ]
Note: No space is allowed between the option flag and the associated
arguments.
DESCRIPTION
mgd77track 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.
REQUIRED ARGUMENTS
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). If no file
extension is given then we search for files with one of the four
known extensions. The search order (and the extensions) tried
is MGD77+ (a.nca), MGD77T (a.m77ta), MGD77 (a.mgd77a ) and plain
text file (a.data). Use -I to ignore one or more of these 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].
-Jparameters (more a|)
Select map projection.
-Rwest/east/south/north[/zmin/zmax][+r][+uunit]
west, east, south, and north specify the region of interest, and
you may specify them in decimal degrees or in
[A+-]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 for grid creation, give Rcodelon/lat/nx/ny, where
code is a 2-character combination of L, C, R (for left, center,
or right) and T, M, B for top, middle, or bottom. e.g., BL for
lower left. This indicates which point on a rectangular region
the lon/lat coordinate refers to, and the grid dimensions nx and
ny with grid spacings via -I is used to create the corresponding
region. Alternatively, specify the name of an existing grid
file and the -R settings (and grid spacing, if applicable) are
copied from the grid. Appending +uunit expects projected (Carte-
sian) coordinates compatible with chosen -J and we inversely
project to determine actual rectangular geographic region. For
perspective view (-p), optionally append /zmin/zmax. In case of
perspective view (-p), a z-range (zmin, zmax) can be appended to
indicate the third dimension. This needs to be done only when
using the -Jz option, not when using only the -p option. In the
latter case a perspective view of the plane is plotted, with no
third dimension.
OPTIONAL ARGUMENTS
-A[c][size][,spacing]
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 FONT_LABEL. 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[p|s]parameters (more a|)
Set map boundary frame and axes attributes.
-Cf|g|e
Select procedure for along-track distance calculation:
f Flat Earth distances. g Great circle distances
[Default]. e Geodesic distances on current GMT ellip-
soid.
-Dastartdate
Do not plot data collected before startdate
(yyyy-mm-ddT[hh:mm:ss]) [Default is first day].
-Dbstopdate
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].
-Gd|t|ngap
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. The nN form is used to plot only one every other N
points. This is useful to reduce plot file size bat cannot be
used (will be ignored) with the other two gap types.
-Iignore
Ignore certain data file formats from consideration. Append
a|c|m|t to ignore MGD77 ASCII, MGD77+ netCDF, MGD77T ASCII, or
plain table files, respectively. The option may be repeated to
ignore more than one format. [Default ignores none].
-K (more a|)
Do not finalize the PostScript plot.
-Ltrackticks
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 (more a|)
Append to existing PostScript plot.
-P (more a|)
Select aPortraita plot orientation.
-Sastartdist[u]
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].
-Sbstopdist[u]
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].
-TT|t|dms,mc,mfs,mf,mfc
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, marker-
color, markerfontsize, markerfont, and markerfontcolor. Repeat
the -T option for each marker type.
-U[[just]/dx/dy/][c|label] (more a|)
Draw GMT time stamp logo on plot.
-W[-|+][pen]
Append pen used for the trackline. [Defaults: width = default,
color = black, style = solid]. A leading + will use the lookup
color (via -C) for both symbol fill and outline pen color, while
a leading - will set outline pen color and turn off symbol fill.
-X[a|c|f|r][x-shift[u]]
-Y[a|c|f|r][y-shift[u]] (more a|)
Shift plot origin.
-V[level] (more a|)
Select verbosity level [c].
-p[x|y|z]azim[/elev[/zlevel]][+wlon0/lat0[/z0]][+vx0/y0] (more a|)
Select perspective view.
-t[transp] (more a|)
Set PDF transparency level in percent.
-^ or just -
Print a short message about the syntax of the command, then
exits (NOTE: on Windows just use -).
-+ or just +
Print an extensive usage (help) message, including the explana-
tion of any module-specific option (but not the GMT common
options), then exits.
-? or no arguments
Print a complete usage (help) message, including the explanation
of all options, then exits.
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:
gmt mgd77track 01010007 -R70W/20E/40S/20N -Jm0.1 -B10g5 -A10 \
-La1da1000kf6hf250k \| lpr
SEE ALSO
mgd77info(1), psbasemap(1), mgd77list(1)
REFERENCES
The Marine Geophysical Data Exchange Format - MGD77, see
http://www.ngdc.noaa.gov/mgg/dat/geodas/docs/mgd77.txt
COPYRIGHT
2017, P. Wessel, W. H. F. Smith, R. Scharroo, J. Luis, and F. Wobbe
5.4.2 Jun 24, 2017 mgd77track(1)
gmt5 5.4.2 - Generated Thu Jun 29 14:51:32 CDT 2017