Provided by: gmt-common_5.4.3+dfsg-1_all 
NAME
psxy - Plot lines, polygons, and symbols on maps
SYNOPSIS
psxy [ table ] -Jparameters
-Rwest/east/south/north[/zmin/zmax][+r] [ -A[m|p|x|y] ] [ -B[p|s]parameters ] [ -Ccpt ] [ -Ddx/dy ]
[ -E[x|y|X|Y][+a][+cl|f][+n][+wcap][+ppen] ] [ -F[c|n|r][refpoint] ] [ -Gfill ] [ -Iintens ] [ -K ]
[ -L[+b|d|D][+xl|r|x0][+yl|r|y0][+ppen] ] [ -N[c|r] ] [ -O ] [ -P ] [ -S[symbol][size[u] ] [ -T ] [
-U[stamp] ] [ -V[level] ] [ -W[pen][attr] ] [ -Xx_offset ] [ -Yy_offset ] [ -aflags ] [ -bibinary ] [
-dinodata ] [ -eregexp ] [ -fflags ] [ -ggaps ] [ -hheaders ] [ -iflags ] [ -pflags ] [ -ttransp ] [
-:[i|o] ]
Note: No space is allowed between the option flag and the associated arguments.
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 specified then the symbol code (see -S below) must be present as last column
in the input. If -S is not used, a line connecting the data points will be drawn instead. To explicitly
close polygons, use -L. Select a fill 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 and outline/no outline,
respectively. The PostScript code is written to standard output.
REQUIRED ARGUMENTS
-Jparameters (more …)
Select map projection.
-Rxmin/xmax/ymin/ymax[+r][+uunit] (more …)
Specify the region of interest.
For perspective view p, optionally append /zmin/zmax. (more …)
OPTIONAL ARGUMENTS
table One or more ASCII (or binary, see -bi[ncols][type]) data table file(s) holding a number of data
columns. If no tables are given then we read from standard input. Use -T to ignore all input
files, including standard input (see below).
-A[m|p|x|y]
By default, geographic line segments are drawn as great circle arcs. To draw them as straight
lines, use the -A flag. Alternatively, add m to draw the line by first following a meridian, then
a parallel. Or append p to start following a parallel, then a meridian. (This can be practical to
draw a line along parallels, for example). For Cartesian data, points are simply connected,
unless you append x or y to draw stair-case curves that whose first move is along x or y,
respectively.
-B[p|s]parameters (more …)
Set map boundary frame and axes attributes.
-Ccpt Give a CPT or specify -Ccolor1,color2[,color3,…] to build a linear continuous CPT from those
colors automatically. In this case colorn can be a r/g/b triplet, a color name, or an HTML
hexadecimal color (e.g. #aabbcc ). If -S is set, let symbol fill 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, then psxy expects the user to supply a
multisegment file where each segment header contains a -Zval string. The val will control the
color of the line or polygon (if -L is set) via the CPT.
-Ddx/dy
Offset the plot symbol or line locations by the given amounts dx/dy [Default is no offset]. If dy
is not given it is set equal to dx.
-E[x|y|X|Y][+a][+cl|f][+n][+wcap][+ppen]
Draw symmetrical 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,z) triplet]. If +a is appended then we will draw asymmetrical error bars; these requires two
rather than one extra data column, with the low and high value. If upper case X and/or Y are used
we will instead draw “box-and-whisker” (or “stem-and-leaf”) symbols. The x (or y) coordinate is
then taken as the median value, and four more columns are expected to contain the minimum (0%
quantile), the 25% quantile, the 75% quantile, and the maximum (100% quantile) values. The 25-75%
box may be filled by using -G. If +n is appended the we draw a notched “box-and-whisker” symbol
where the notch width reflects the uncertainty in the median. This symbol requires a 5th extra
data column to contain the number of points in the distribution. The +w modifier sets the cap
width that indicates the length of the end-cap on the error bars [7p]. Pen attributes for error
bars may also be set via +ppen. [Defaults: width = default, color = black, style = solid]. When
-C is used we can control how the look-up color is applied to our symbol. Append +cf to use it to
fill the symbol, while +cl will just set the error pen color and turn off symbol fill. Giving +c
will set both color items.
-F[c|n|r][a|f|s|r|refpoint]
Alter the way points are connected (by specifying a scheme) and data are grouped (by specifying a
method). Append one of three line connection schemes: c: Draw continuous line segments for each
group [Default]. r: Draw line segments from a reference point reset for each group. n: Draw
networks of line segments between all points in each group. Optionally, append the one of four
segmentation methods to define the group: a: Ignore all segment headers, i.e., let all points
belong to a single group, and set group reference point to the very first point of the first file.
f: Consider all data in each file to be a single separate group and reset the group reference
point to the first point of each group. s: Segment headers are honored so each segment is a
group; the group reference point is reset to the first point of each incoming segment [Default].
r: Same as s, but the group reference point is reset after each record to the previous point (this
method is only available with the -Fr scheme). Instead of the codes a|f|s|r you may append the
coordinates of a refpoint which will serve as a fixed external reference point for all groups.
-Gfill Select color or pattern for filling of symbols or polygons [Default is no fill]. Note that psxy
will search for -G and -W strings in all the segment headers and let any values thus found
over-ride the command line settings.
-Iintens
Use the supplied intens value (nominally in the -1 to + 1 range) to modulate the fill color by
simulating illumination [none].
-K (more …)
Do not finalize the PostScript plot.
-L[+b|d|D][+xl|r|x0][+yl|r|y0][+ppen]
Force closed polygons. Alternatively, append modifiers to build a polygon from a line segment.
Append +d to build symmetrical envelope around y(x) using deviations dy(x) given in extra column
3. Append +D to build asymmetrical envelope around y(x) using deviations dy1(x) and dy2(x) from
extra columns 3-4. Append +b to build asymmetrical envelope around y(x) using bounds yl(x) and
yh(x) from extra columns 3-4. Append +xl|r|x0 to connect first and last point to anchor points at
either xmin, xmax, or x0, or append +yb|t|y0 to connect first and last point to anchor points at
either ymin, ymax, or y0. Polygon may be painted (-G) and optionally outlined by adding +ppen [no
outline].
-N[c|r]
Do NOT clip symbols that fall outside map border [Default plots points whose coordinates are
strictly inside the map border only]. The option does not apply to lines and polygons which are
always clipped to the map region. For periodic (360-longitude) maps we must plot all symbols twice
in case they are clipped by the repeating boundary. The -N will turn off clipping and not plot
repeating symbols. Use -Nr to turn off clipping but retain the plotting of such repeating
symbols, or use -Nc to retain clipping but turn off plotting of repeating symbols.
-O (more …)
Append to existing PostScript plot.
-P (more …)
Select “Portrait” plot orientation.
-S[symbol][size[u]]
Plot symbols (including vectors, pie slices, fronts, decorated or quoted lines). If present, size
is symbol size in the unit set in gmt.conf (unless c, i, or p is appended). If the symbol code
(see below) is not given it will be read from the last column in the input data; this cannot be
used in conjunction with binary input. Optionally, append c, i, or p to indicate that the size
information in the input data is in units of cm, inch, or point, respectively [Default is
PROJ_LENGTH_UNIT]. Note: if you provide both size and symbol via the input file you must use
PROJ_LENGTH_UNIT to indicate the unit used for the symbol size or append the units to the sizes in
the file. If symbol sizes are expected via the third data column then you may convert those
values to suitable symbol sizes via the -i mechanism.
The uppercase symbols A, C, D, G, H, I, N, S, T are normalized to have the same area as a circle
with diameter size, while the size of the corresponding lowercase symbols refers to the diameter
of a circumscribed circle.
You can change symbols by adding the required -S option to any of your multisegment headers.
Choose between these symbol codes:
-S- x-dash (-). size is the length of a short horizontal (x-dir) line segment.
-S+ plus (+). size is diameter of circumscribing circle.
-Sa star. size is diameter of circumscribing circle.
-Sb[size[c|i|p|u]][b[base]]
Vertical 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 = ymin. Append b[base] to change this
value. If base is not appended then we read it from the last input data column.
-SB[size[c|i|p|u]][b[base]]
Horizontal bar extending from base to x. size is bar width. Append u if size is in y-units
[Default is plot-distance units]. By default, base = xmin. Append b[base] to change this
value. If base is not appended then we read it from the last input data column.
-Sc circle. size is diameter of circle.
-Sd diamond. size is diameter of circumscribing circle.
-Se ellipse. Direction (in degrees counter-clockwise from horizontal), 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 directions unchanged.) Furthermore, the axes lengths must be given in
geographical instead of plot-distance units. An exception occurs for a linear projection in
which we assume the ellipse axes are given in the same units as -R. For degenerate
ellipses (circles) with just the diameter given, use -SE-. The diameter is excepted to be
given in column 3. Alternatively, append the desired diameter to -SE- and this fixed
diameter is used instead. For allowable geographical units, see UNITS.
-Sfgap[/size][+l|+r][+b+c+f+s+t][+ooffset][+p[pen]].
Draw a front. 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. If size is missing it
is set to 30% of the gap, except when gap is negative and size is thus required. Append +l
or +r 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). The +s modifier optionally accepts the angle used to draw the vector [20].
Alternatively, use +S which draws arcuate arrow heads. Append +ooffset to offset the first
symbol from the beginning of the front by that amount [0]. The chosen symbol is drawn with
the same pen as set for the line (i.e., via -W). The use an alternate pen, append +ppen.
To skip the outline, just use +p. Note: By placing -Sf options in the segment header you
can change the front types on a segment-by-segment basis.
-Sg octagon. size is diameter of circumscribing circle.
-Sh hexagon. size is diameter of circumscribing circle.
-Si inverted triangle. size is diameter of circumscribing circle.
-Sj Rotated rectangle. Direction (in degrees counter-clockwise from horizontal), x-dimension,
and y-dimension must be found in columns 3, 4, and 5.
-SJ Same as -Sj, 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 (-Sj
leaves the directions unchanged.) Furthermore, the dimensions must be given in geographical
instead of plot-distance units. For a degenerate rectangle (square) with one dimension
given, use -SJ-. The dimension is excepted to be given in column 3. Alternatively, append
the dimension diameter to -SJ- and this fixed dimension is used instead. An exception
occurs for a linear projection in which we assume the dimensions are given in the same
units as -R. For allowable geographical units, see UNITS.
-Sk kustom symbol. Append name/size, and we will look for a definition file called name.def in
(1) the current directory or (2) in ~/.gmt or (3) in $GMT_SHAREDIR/custom. The symbol as
defined in that file is of size 1.0 by default; the appended size will scale symbol
accordingly. Users may add their own custom *.def files; see CUSTOM SYMBOLS below.
-Sl letter or text string (less than 256 characters). Give size, and append +tstring after the
size. Note that the size is only approximate; no individual scaling is done for different
characters. Remember to escape special characters like *. Optionally, you may append +ffont
to select a particular font [Default is FONT_ANNOT_PRIMARY] and +jjustify to change
justification [CM].
-Sm math angle arc, optionally with one or two arrow heads [Default is no arrow heads]. The
size is the length of the vector head. Arc width is set by -W. The radius of the arc and
its start and stop directions (in degrees counter-clockwise from horizontal) must be given
in columns 3-5. See VECTOR ATTRIBUTES for specifying other attributes.
-SM Same as -Sm but switches to straight angle symbol if angles subtend 90 degrees exactly.
-Sn pentagon. size is diameter of circumscribing circle.
-Sp point. No size needs to be specified (1 pixel is used).
-Sq quoted line, i.e., lines with annotations such as contours. Append
[d|D|f|l|L|n|N|s|S|x|X]info[:labelinfo]. The required argument controls the placement of
labels along the quoted lines. Choose among six controlling algorithms:
ddist[c|i|p] or Ddist[d|e|f|k|m|M|n|s]
For lower case d, give distances between labels on the plot in your preferred
measurement unit c (cm), i (inch), or p (points), while for upper case D, specify
distances in map units and append the unit; choose among e (m), f (foot), k (km),
M (mile), n (nautical mile) or u (US survey foot), and d (arc degree), m (arc
minute), or s (arc second). [Default is 10c or 4i]. As an option, you can append
/fraction which is used to place the very first label for each contour when the
cumulative along-contour distance equals fraction * dist [0.25].
fffile.d
Reads the ASCII file ffile.d and places labels at locations in the file that
matches locations along the quoted lines. Inexact matches and points outside the
region are skipped.
l|Lline1[,line2,…]
Give the coordinates of the end points for one or more comma-separated straight
line segments. Labels will be placed where these lines intersect the quoted
lines. The format of each line specification is
start_lon/start_lat/stop_lon/stop_lat. Both start_lon/start_lat and
stop_lon/stop_lat can be replaced by a 2-character key that uses the
justification format employed in pstext to indicate a point on the frame or
center of the map, given as [LCR][BMT]. L will interpret the point pairs as
defining great circles [Default is straight line].
n|Nn_label
Specifies the number of equidistant labels for quoted lines [1]. Upper case N
starts labeling exactly at the start of the line [Default centers them along the
line]. N-1 places one justified label at start, while N+1 places one justified
label at the end of quoted lines. Optionally, append /min_dist[c|i|p] to enforce
that a minimum distance separation between successive labels is enforced.
s|Sn_label
Same as n|Nn_label but implies that the input data are first to be converted into
a series of 2-point line segments before plotting.
x|Xxfile.d
Reads the multisegment file xfile.d and places labels at the intersections
between the quoted lines and the lines in xfile.d. X will resample the lines
first along great-circle arcs. In addition, you may optionally append
+rradius[c|i|p] to set a minimum label separation in the x-y plane [no
limitation].
The optional labelinfo controls the specifics of the label formatting and consists of a
concatenated string made up of any of the following control arguments:
+aangle
For annotations at a fixed angle, +an for line-normal, or +ap for line-parallel
[Default].
+cdx[/dy]
Sets the clearance between label and optional text box. Append c|i|p to specify
the unit or % to indicate a percentage of the label font size [15%].
+d Turns on debug which will draw helper points and lines to illustrate the workings
of the quoted line setup.
+e Delay the plotting of the text. This is used to build a clip path based on the
text, then lay down other overlays while that clip path is in effect, then
turning of clipping with psclip -Cs which finally plots the original text.
+ffont Sets the desired font [Default FONT_ANNOT_PRIMARY with its size changed to 9p].
+g[color]
Selects opaque text boxes [Default is transparent]; optionally specify the color
[Default is PS_PAGE_COLOR].
+jjust Sets label justification [Default is MC]. Ignored when -SqN|n+|-1 is used.
+llabel
Sets the constant label text.
+Lflag Sets the label text according to the specified flag:
+Lh Take the label from the current segment header (first scan for an embedded
-Llabel option, if not use the first word following the segment flag). For
multiple-word labels, enclose entire label in double quotes. +Ld Take the
Cartesian plot distances along the line as the label; append c|i|p as the unit
[Default is PROJ_LENGTH_UNIT]. +LD Calculate actual map distances; append
d|e|f|k|n|M|n|s as the unit [Default is d(egrees), unless label placement was
based on map distances along the lines in which case we use the same unit
specified for that algorithm]. Requires a map projection to be used. +Lf Use
text after the 2nd column in the fixed label location file as the label. Requires
the fixed label location setting. +Lx As +Lh but use the headers in the xfile.d
instead. Requires the crossing file option.
+ndx[/dy]
Nudges the placement of labels by the specified amount (append c|i|p to specify
the units). Increments are considered in the coordinate system defined by the
orientation of the line; use +N to force increments in the plot x/y coordinates
system [no nudging]. Not allowed with +v.
+o Selects rounded rectangular text box [Default is rectangular]. Not applicable
for curved text (+v) and only makes sense for opaque text boxes.
+p[pen]
Draws the outline of text boxes [Default is no outline]; optionally specify pen
for outline [Default is width = 0.25p, color = black, style = solid].
+rmin_rad
Will not place labels where the line’s radius of curvature is less than min_rad
[Default is 0].
+t[file]
Saves line label x, y, and text to file [Line_labels.txt]. Use +T to save x, y,
angle, text instead.
+uunit Appends unit to all line labels. If unit starts with a leading hyphen (-) then
there will be no space between label value and the unit. [Default is no unit].
+v Specifies curved labels following the path [Default is straight labels].
+w Specifies how many (x,y) points will be used to estimate label angles [Default is
10].
+x[first,last]
Append the suffices first and last to the corresponding labels. This modifier is
only available when -SqN2 is in effect. Used to annotate the start and end of a
line (e.g., a cross-section), append two text strings separated by comma [Default
just adds a prime to the second label].
+=prefix
Prepends prefix to all line labels. If prefix starts with a leading hyphen (-)
then there will be no space between label value and the prefix. [Default is no
prefix].
Note: By placing -Sq options in the segment header you can change the quoted text
attributes on a segment-by-segment basis.
-Sr rectangle. No size needs to be specified, but the x- and y-dimensions must be found in
columns 3 and 4.
-SR Rounded rectangle. No size needs to be specified, but the x- and y-dimensions and corner
radius must be found in columns 3, 4, and 5.
-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, and size, if not specified on the command-line, should be present in
column 5. The size is the length of the vector head. Vector width is set by -W. See
VECTOR ATTRIBUTES for specifying other attributes.
-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 directions unchanged.) See VECTOR ATTRIBUTES for specifying other attributes.
-Sw pie wedge. Start and stop directions (in degrees counter-clockwise from horizontal) for pie
slice must be found in columns 3 and 4. Append +a to just draw the arc line or +r to just
draw the radial lines.
-SW Same as -Sw, except azimuths (in degrees east of north) should be given instead of the two
directions. The azimuths will be mapped into angles based on the chosen map projection (-Sw
leaves the directions unchanged.) For geo-wedges, specify size as a radial geographical
distance. For allowable geographical units, see UNITS. Append +a to just draw the arc or
+r to just draw the radial lines.
-Sx cross (x). size is diameter of circumscribing circle.
-Sy y-dash (|). size is the length of a short vertical (y-dir) line segment.
-S= geovector. Azimuth (in degrees east from north) and geographical length must be found in
columns 3 and 4. The size is the length of the vector head. Vector width is set by -W. See
VECTOR ATTRIBUTES for specifying attributes. Note: Geovector stems are drawn as thin
filled polygons and hence pen attributes like dashed and dotted are not available. For
allowable geographical units, see UNITS.
-S~ decorated line, i.e., lines with symbols along them. Append
[d|D|f|l|L|n|N|s|S|x|X]info[:symbolinfo]. The required argument controls the placement of
symbols along the decorated lines. Choose among six controlling algorithms:
ddist[c|i|p] or Ddist[d|e|f|k|m|M|n|s]
For lower case d, give distances between symbols on the plot in your preferred
measurement unit c (cm), i (inch), or p (points), while for upper case D, specify
distances in map units and append the unit; choose among e (m), f (foot), k (km),
M (mile), n (nautical mile) or u (US survey foot), and d (arc degree), m (arc
minute), or s (arc second). [Default is 10c or 4i]. As an option, you can append
/fraction which is used to place the very first symbol for each line when the
cumulative along-line distance equals fraction * dist [0.25].
fffile.d
Reads the ASCII file ffile.d and places symbols at locations in the file that
matches locations along the decorated lines. Inexact matches and points outside
the region are skipped.
l|Lline1[,line2,…]
Give the coordinates of the end points for one or more comma-separated straight
line segments. Symbols will be placed where these lines intersect the decorated
lines. The format of each line specification is
start_lon/start_lat/stop_lon/stop_lat. Both start_lon/start_lat and
stop_lon/stop_lat can be replaced by a 2-character key that uses the
justification format employed in pstext to indicate a point on the frame or
center of the map, given as [LCR][BMT]. L will interpret the point pairs as
defining great circles [Default is straight line].
n|Nn_symbol
Specifies the number of equidistant symbols for decorated lines [1]. Upper case N
starts placing symbols exactly at the start of the line [Default centers them
along the line]. N-1 places one symbol at start, while N+1 places one symbol at
the end of decorated lines. Optionally, append /min_dist[c|i|p] to enforce that a
minimum distance separation between successive symbols is enforced.
s|Sn_symbol
Same as n|Nn_symbol but implies that the input data are first to be converted
into a series of 2-point line segments before plotting.
x|Xxfile.d
Reads the multisegment file xfile.d and places symbols at the intersections
between the decorated lines and the lines in xfile.d. X will resample the lines
first along great-circle arcs.
The optional symbolinfo controls the specifics of the symbol selection and formatting
and consists of a concatenated string made up of any of the following control arguments:
+aangle
For symbols at a fixed angle, +an for line-normal, or +ap for line-parallel
[Default].
+d Turns on debug which will draw helper points and lines to illustrate the workings
of the decorated line setup.
+g[fill]
Sets the symbol fill [no fill].
+ndx[/dy]
Nudges the placement of symbols by the specified amount (append c|i|p to specify
the units). Increments are considered in the coordinate system defined by the
orientation of the line; use +N to force increments in the plot x/y coordinates
system [no nudging].
+p[pen]
Draws the outline of symbols [Default is no outline]; optionally specify pen for
outline [Default is width = 0.25p, color = black, style = solid].
+s<symbol><size>
Specifies the code and size of the decorative symbol.
+w Specifies how many (x,y) points will be used to estimate symbol angles [Default
is 10].
Note: By placing -S~ options in the segment header you can change the decorated lines on a
segment-by-segment basis.
-T Ignore all input files, including standard input. This is the same as specifying /dev/null (or NUL
for Windows users) as input file. Use this to activate only the options that are not related to
plotting of lines or symbols, such as psxy -R -J -O -T to terminate a sequence of GMT plotting
commands without producing any plotting output.
-U[[just]/dx/dy/][c|label] (more …)
Draw GMT time stamp logo on plot.
-V[level] (more …)
Select verbosity level [c].
-W[pen][attr] (more …)
Set pen attributes for lines or the outline of symbols [Defaults: width = default, color = black,
style = solid]. If the modifier +cl is appended then the color of the line are taken from the CPT
(see -C). If instead modifier +cf is appended then the color from the cpt file is applied to
symbol fill. Use just +c for both effects. You can also append one or more additional line
attribute modifiers: +ooffsetu will start and stop drawing the line the given distance offsets
from the end point. Append unit u from c|i|p to indicate plot distance on the map or append map
distance units instead (see below) [Cartesian distances]; +s will draw the line using a PostScript
Bezier spline [linear spline]; +vvspecs will place a vector head at the ends of the lines. You
can use +vb and +ve to specify separate vector specs at each end [shared specs]. Because +v may
take additional modifiers it must necessarily be given at the end of the pen specification. See
the Vector Attributes for more information.
-X[a|c|f|r][x-shift[u]]
-Y[a|c|f|r][y-shift[u]] (more …)
Shift plot origin.
-bi[ncols][t] (more …)
Select native binary input. [Default is the required number of columns given the chosen settings].
-acol=name[…] (more …)
Set aspatial column associations col=name.
-dinodata (more …)
Replace input columns that equal nodata with NaN.
-e[~]”pattern” | -e[~]/regexp/[i] (more …)
Only accept data records that match the given pattern.
-f[i|o]colinfo (more …)
Specify data types of input and/or output columns.
-g[a]x|y|d|X|Y|D|[col]z[+|-]gap[u] (more …)
Determine data gaps and line breaks. The -g option is ignored if -S is set.
-h[i|o][n][+c][+d][+rremark][+rtitle] (more …)
Skip or produce header record(s).
-icols[+l][+sscale][+ooffset][,…] (more …)
Select input columns and transformations (0 is first column).
-:[i|o] (more …)
Swap 1st and 2nd column on input and/or output.
-p[x|y|z]azim[/elev[/zlevel]][+wlon0/lat0[/z0]][+vx0/y0] (more …)
Select perspective view.
-t[transp] (more …)
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 explanation 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.
UNITS
For map distance unit, append unit d for arc degree, m for arc minute, and s for arc second, or e for
meter [Default], f for foot, k for km, M for statute mile, n for nautical mile, and u for US survey foot.
By default we compute such distances using a spherical approximation with great circles. Prepend - to a
distance (or the unit is no distance is given) to perform “Flat Earth” calculations (quicker but less
accurate) or prepend + to perform exact geodesic calculations (slower but more accurate).
VECTOR ATTRIBUTES
Several modifiers may be appended to the vector-producing options to specify the placement of vector
heads, their shapes, and the justification of the vector. Below, left and right refers to the side of the
vector line when viewed from the start point to the end point of the segment:
+aangle sets the angle of the vector head apex [30].
+b places a vector head at the beginning of the vector path [none]. Optionally, append t for a
terminal line, c for a circle, a for arrow [Default], i for tail, A for plain arrow, and I for plain
tail. Further append l|r to only draw the left or right side of this head [both sides].
+e places a vector head at the end of the vector path [none]. Optionally, append t for a terminal
line, c for a circle, a for arrow [Default], i for tail, A for plain arrow, and I for plain tail.
Further append l|r to only draw the left or right side of this head [both sides].
+g-|fill turns off vector head fill (if -) or sets the vector head fill [Default fill is used, which
may be no fill].
+hshape sets the shape of the vector head (range -2/2). Default is controlled by MAP_VECTOR_SHAPE [0].
+l draws half-arrows, using only the left side of specified heads [both sides].
+m places a vector head at the mid-point the vector path [none]. Append f or r for forward or reverse
direction of the vector [forward]. Optionally, append t for a terminal line, c for a circle, or a for
arrow head [Default]. Further append l|r to only draw the left or right side of this head [both
sides]. Cannot be combined with +b or +e.
+nnorm scales down vector attributes (pen thickness, head size) with decreasing length, where vectors
shorter than norm will have their attributes scaled by length/norm [arrow attributes remains invariant
to length].
+oplon/plat specifies the oblique pole for the great or small circles. Only needed for great circles
if +q is given.
+p[-][pen] sets the vector pen attributes. If pen has a leading - then the head outline is not drawn.
[Default pen is used, and head outline is drawn]
+q means the input angle, length data instead represent the start and stop opening angles of the arc
segment relative to the given point.
+r draws half-arrows, using only the right side of specified heads [both sides].
+t[b|e]trim will shift the beginning or end point (or both) along the vector segment by the given
trim; append suitable unit. If the modifiers b|e are not used then trim may be two values separated by
a slash, which is used to specify different trims for the two ends. Positive trims will shorted the
vector while negative trims will lengthen it [no trim].
In addition, all but circular vectors may take these modifiers:
+jjust determines how the input x,y point relates to the vector. Choose from beginning [default], end,
or center.
+s means the input angle, length are instead the x, y coordinates of the vector end point.
Finally, Cartesian vectors may take these modifiers:
+zscale[unit] expects input dx,dy vector components and uses the scale to convert to polar coordinates
with length in given unit.
EXAMPLES
To plot solid red circles (diameter = 0.2 cm) at the positions listed in the file DSDP.txt on a Mercator
map at 0.3 cm/degree of the area 100E to 160E, 20S to 30N, with automatic tick-marks and gridlines, use
gmt psxy DSDP.txt -R100/160/-20/30 -Jm0.3c -Sc0.2c -Gred -Bafg > map.ps
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 CPT rgb.cpt on a linear map, use
gmt psxy quakes.xyzm -R0/1000/0/1000 -JX6i -Sc -Crgb -B200 > map.ps
To plot the file trench.txt 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
gmt psxy trench.txt -R150/200/20/50 -Jm0.15i -Sf0.8i/0.1i+l+t -Gwhite -W -B10 > map.ps
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 CPT chrome on a
linear map, use
gmt psxy misc.d -R0/100/-50/100 -JX6i -S -Cchrome -B20 > map.ps
If you need to place vectors on a plot you can choose among straight Cartesian vectors, math circular
vectors, or geo-vectors (these form small or great circles on the Earth). These can have optional heads
at either end, and heads may be the traditional arrow, a circle, or a terminal cross-line. To place a
few vectors with a circle at the start location and an arrow head at the end, try
gmt psxy -R0/50/-50/50 -JX6i -Sv0.15i+bc+ea -Gyellow -W0.5p -Baf << EOF > map.ps
10 10 45 2i
30 -20 0 1.5i
EOF
To plot vectors (red vector heads, solid stem) from the file data.txt that contains record of the form
lon, lat, dx, dy, where dx, dy are the Cartesian vector components given in user units, and these user
units should be converted to cm given the scale 3.60, try
gmt psxy -R20/40/-20/0 -JM6i -Sv0.15i+e+z3.6c -Gred -W0.25p -Baf data.txt > map.ps
SEGMENT HEADER PARSING
Segment header records may contain one of more of the following options:
-Gfill Use the new fill and turn filling on
-G- Turn filling off
-G Revert to default fill (none if not set on command line)
-Wpen Use the new pen and turn outline on
-W Revert to default pen MAP_DEFAULT_PEN (if not set on command line)
-W- Turn outline off
-Zzval Obtain fill via cpt lookup using z-value zval
-ZNaN Get the NaN color from the CPT
CUSTOM SYMBOLS
psxy allows users to define and plot their own custom symbols. This is done by encoding the symbol using
our custom symbol macro code described in Appendix N. Put all the macro codes for your new symbol in a
file whose extension must be .def; you may then address the symbol without giving the extension (e.g.,
the symbol file tsunami.def is used by specifying -Sktsunami/size. The definition file can contain any
number of plot code records, as well as blank lines and comment lines (starting with #). psxy will look
for the definition files in (1) the current directory, (2) the ~/.gmt directory, and (3) the
$GMT_SHAREDIR/custom directory, in that order. Freeform polygons (made up of straight line segments and
arcs of circles) can be designed - these polygons can be painted and filled with a pattern. Other
standard geometric symbols can also be used. See Appendix App-custom_symbols for macro definitions.
POLAR CAPS
psxy will automatically determine if a closed polygon is containing a geographic pole, i.e., being a
polar cap. Such polygons requires special treatment under the hood to ensure proper filling. Many tools
such as GIS packages are unable to handle polygons covering a pole and some cannot handle polygons
crossing the Dateline. They work around this problem by splitting polygons into a west and east polygon
or inserting artificial helper lines that makes a cut into the pole and back. Such doctored polygons may
be misrepresented in GMT.
SEE ALSO
gmt, gmt.conf, gmtcolors, psbasemap, psxyz
COPYRIGHT
2018, P. Wessel, W. H. F. Smith, R. Scharroo, J. Luis, and F. Wobbe