NAME
psxy - Plot lines, polygons, and symbols on maps
SYNOPSIS
psxy files -Jparameters -Rwest/east/south/north[r] [ -A ] [ -Btickinfo
] [ -Ccptfile ] [ -E[x|y|X|Y][cap][/pen] ] [ -Gfill ] [ -H[nrec] ] [ -K
] [ -L ] [ -N ] [ -M[flag] ] [ -O ] [ -P ] [ -S[symbol][size] ] [
-U[/dx/dy/][label] ] [ -V ] [ -W[pen] ] [ -Xx-shift ] [ -Yy-shift ] [
-: ] [ -ccopies ] [ -bi[s][n] ]
DESCRIPTION
psxy reads (x,y) pairs from files [or standard input] and generates
PostScript code that will plot lines, polygons, or symbols at those
locations on a map. If a symbol is selected and no symbol size given,
then psxy will interpret the third column of the input data as symbol
size. Symbols whose size is <= 0 are skipped. If no symbols are speci-
fied then the symbol code (see -S below) must be present as last column
in the input. Multiple segment files may be plotted using the -M
option. If -S is not selected, a line connecting the data points will
be drawn instead. To explicitly close polygons, use -L. Select a shade
with -G. If -G is set, -W will control whether the polygon outline is
drawn or not. If a symbol is selected, -G and -W determines the fill
color and outline/no outline, respectively. The PostScript code is
written to standard output.
files List one or more file-names. If no files are given, psxy will
read standard input.
-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 .gmtdefaults, but this
can be overridden on the command line by appending the c, i, or
m to the scale/width value.
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)
-Jdlon0/lat0/lat1/lat2/scale (Equidistant)
-Jllon0/lat0/lat1/lat2/scale (Lambert)
MISCELLANEOUS PROJECTIONS:
-Jhlon0/scale (Hammer)
-Jilon0/scale (Sinusoidal)
-Jk[f|s]lon0/scale (Eckert IV (f) and VI (s))
-Jnlon0/scale (Robinson)
-Jrlon0/scale (Winkel Tripel)
-Jvlon0/scale (Van der Grinten)
-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]] (Linear, log, and power
scaling)
More details can be found in the psbasemap manpages.
-R west, east, south, and north specify the Region of interest. To
specify boundaries in degrees and minutes [and seconds], use the
dd:mm[:ss] format. Append r if lower left and upper right map
coordinates are given instead of wesn.
OPTIONS
No space between the option flag and the associated arguments.
-A Suppress drawing line segments as great circle Arcs. [Default
draws great circle arcs.]
-B Sets map boundary tickmark intervals; see the psbasemap man page
for details.
-C Give a color palette file. When used with -S, lets symbol color
be determined by the z-value in the third column. Additional
fields are shifted over by one column (optional size would be
4th rather than 3rd field, etc.). If -S is not set, psxy
expects the user to supply a multisegment polygon file (requires
-M) and will look for -Zval strings in each multisegment header.
The val will control the color via the cpt file.
-E Draw error bars. Append x and/or y to indicate which bars you
want to draw (Default is both x and y). The x and/or y errors
must be stored in the columns after the (x,y) pair [or
(x,y,size) triplet]. The cap parameter indicates the length of
the end-cap on the error bars [0.25c (or 0.1i)]. Pen attributes
for error bars may also be set. [Defaults: width = 1, color =
0/0/0, texture = solid]. If upper case X and/or Y is used we
will instead draw "box-and-whisker" (or "stem-and-leaf") sym-
bols. The x (or y) coordinate is then taken as the median value,
and 4 more columns are expected to contain the minimum (0% quar-
tile), the 25% quartile, the 75% quartile, and the maximum (100%
quartile) values. The 25-75% box may be filled by using -G.
-G Select filling of polygons and symbols. Append the shade
(0-255), color (r/g/b), or P|pdpi/pattern (polygons only)
[Default is no fill]. Note when -M is chosen, psxy will search
for -G and -W strings in all the subheaders and let any found
values over-ride the command line settings.
-H Input file(s) has Header record(s). Number of header records can
be changed by editing your .gmtdefaults file. If used, GMT
default is 1 header record.
-K More PostScript code will be appended later [Default terminates
the plot system].
-L Force closed polygons: connect the endpoints of the line-seg-
ment(s) and draw polygons.
-M Multiple segment file. Segments are separated by a record whose
first character is flag. [Default is ’>’].
-N Do NOT skip symbols that fall outside map border [Default plots
points inside border only]. The option does not apply to lines
and polygons which are always clipped to the map region.
-O Selects Overlay plot mode [Default initializes a new plot sys-
tem].
-P Selects Portrait plotting mode [GMT Default is Landscape, see
gmtdefaults to change this].
-S Plot symbols. If present, size is symbol size in the unit set in
.gmtdefaults (unless c, i, m, or p is appended). The uppercase
symbols A, C, D, H, I, S, T are normalized to have the same area
as the circle, while the corresponding lowercase symbols all are
circumscribed by the circle. Choose between these symbol codes:
-S Read symbol code (see below) from last column in the input data.
Cannot be used in conjunction with -b. Optionally, append c, i,
m, p to indicate that the size information in the input data is
in units of cm, inch, meter, or point, respectively. [Default is
MEASURE_UNIT].
-Sa star. size is diameter of circumscribing circle.
-Sb bar extending from base to y. size is bar width. Append u if
size is in x-units [Default is plot-distance units]. By default,
base = 0. Append bbase to change this value.
-Sc circle. size is diameter of circle.
-Sd diamond. size is diameter of circumscribing circle.
-Se ellipse. Direction (in degrees counter-clockwise from horizon-
tal), major_axis, and minor_axis must be found in columns 3, 4,
and 5.
-SE Same as -Se, except azimuth (in degrees east of north) should be
given instead of direction. The azimuth will be mapped into an
angle based on the chosen map projection (-Se leaves the direc-
tions unchanged.) Furthermore, the axes lengths must be given in
km instead of plot-distance units.
-Sf front. -Sfgap/size[dir][type][:offset]. Supply distance gap
between symbols and symbol size. If gap is negative, it is
interpreted to mean the number of symbols along the front
instead. Append dir to plot symbols on the left or right side of
the front [Default is centered]. Append type to specify which
symbol to plot: box, circle, fault, slip, or triangle. [Default
is fault]. Slip means left-lateral or right-lateral strike-slip
arrows (centered is not an option). Append :offset to offset the
first symbol from the beginning of the front by that amount
[Default is 0].
-Sh hexagon. size is diameter of circumscribing circle.
-Si inverted triangle. size is diameter of circumscribing circle.
-Sl letter or text string (less than 64 characters). Give size, and
append /string after the size. Note that the size is only
approximate; no individual scaling is done for different charac-
ters. Remember to escape special characters like *. Optionally,
you may append %font to select a particular font [Default is
ANOT_FONT].
-Sp point. No size needs to be specified (1 pixel is used).
-Ss square. size is diameter of circumscribing circle.
-St triangle. size is diameter of circumscribing circle.
-Sv vector. Direction (in degrees counter-clockwise from horizontal)
and length must be found in columns 3 and 4. size, if present,
will be interpreted as arrowwidth/headlength/headwidth [Default
is 0.075c/0.3c/0.25c (or 0.03i/0.12i/0.1i)]. By default arrow
attributes remains invariant to the length of the arrow. To have
the size of the vector scale down with decreasing size, append
nnorm, where vectors shorter than norm will have their
attributes scaled by length/norm.
-SV Same as -Sv, except azimuth (in degrees east of north) should be
given instead of direction. The azimuth will be mapped into an
angle based on the chosen map projection (-Sv leaves the direc-
tions unchanged.)
-Sw pie wedge. Start and stop directions (in degrees counter-clock-
wise from horizontal) for pie slice must be found in columns 3
and 4.
-Sx cross. size is diameter of circumscribing circle.
-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.
-V Selects verbose mode, which will send progress reports to stderr
[Default runs "silently"].
-W Set pen attributes. [Defaults: width = 1, color = 0/0/0, texture
= solid]. Implicitly draws the outline of symbols with selected
pen.
-X -Y Shift origin of plot by (x-shift,y-shift). Prepend a for abso-
lute coordinates; the default (r) will reset plot origin.
-: Toggles between (longitude,latitude) and (latitude,longitude)
input/output. [Default is (longitude,latitude)]. Applies to
geographic coordinates only.
-c Specifies the number of plot copies. [Default is 1]
-bi Selects binary input. Append s for single precision [Default is
double]. Append n for the number of columns in the binary
file(s). [Default is the required number of columns given the
chosen settings].
EXAMPLES
To plot solid red circles (diameter = 0.25 cm) at the positions listed
in the file DSDP.xy on a Mercator map at 5 cm/degree of the area 150E
to 154E, 18N to 23N, with tickmarks every 1 degree and gridlines every
15 minutes, try:
psxy DSDP.xy -R150/154/18/23 -Jm5c -Sc0.25c -G255/0/0 -B1g15m | lpr
To plot the xyz values in the file quakes.xyzm as circles with size
given by the magnitude in the 4th column and color based on the depth
in the third using the color palette cpt on a linear map, try
psxy quakes.xyzm -R0/1000/0/1000 -JX6i -Sc -Ccpt -B200 > map.ps
To plot the file trench.xy on a Mercator map, with white triangles with
sides 0.25 inch on the left side of the line, spaced every 0.8 inch,
use
psxy trench.xy -R150/200/20/50 -Jm0.15i -Sf0.8i/0.1ilt -G255 -W -B10 |
lpr br
To plot the data in the file misc.d as symbols determined by the code
in the last column, and with size given by the magnitude in the 4th
column, and color based on the third column via the color palette cpt
on a linear map, try
psxy misc.d -R0/100/-50/100 -JX6i -S -Ccpt -B20 > t.ps
BUGS
The -N option does not adjust the BoundingBox information so you may
have to post-process the PostScript outout with epstool or ps2epsi to
obtain a correct BoundingBox.
psxy cannot handle filling of polygons that contain the south or north
pole. For such a polygon, make a copy and split it into two and make
each explicitly contain the polar point. The two polygons will combine
to give the desired effect when filled; to draw outline use the origi-
nal polygon.
SEE ALSO
gmt(l), psbasemap(l), psxyz(l)
GMT3.4.6 1 Jan 2005 PSXY(l)
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