Provided by: gmt_4.5.11-1build1_amd64 bug

NAME

       psxy - Plot lines, polygons, and symbols on maps

SYNOPSIS

       psxy  files  -Jparameters  -Rwest/east/south/north[r]  [ -A[m|p] ] [ -B[p|s]parameters ] [
       -Ccptfile ] [ -Ddx/dy ] [ -E[x|y|X|Y][n][cap][/[-|+]pen] ] [ -Gfill ] [  -H[i][nrec]  ]  [
       -Iintens   ]   [  -K  ]  [  -L  ]  [  -N  ]  [  -O  ]  [  -P  ]  [  -S[symbol][size]  ]  [
       -U[just/dx/dy/][c|label]  ]  [  -V  ]  [  -W[-|+][pen]  ]  [  -X[a|c|r][x-shift[u]]  ]   [
       -Y[a|c|r][y-shift[u]]  ]  [  -:[i|o]  ]  [ -bi[s|S|d|D[ncol]|c[var1/...]] ] [ -ccopies ] [
       -fcolinfo ] [ -g[a]x|y|d|X|Y|D|[col]z[+|-]gap[u] ] [ -m[flag] ]

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.  Multiple
       segment  files  may  be plotted using the -m option.  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.

       files  List  one or more file-names. If no files are given, psxy will read standard input.
              Use -T to ignore all input files, including standard input (see below).

       -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
              .gmtdefaults4, but this can be overridden on the command line by appending c, i, or
              m  to  the scale/width value.  When central meridian is optional, default is center
              of longitude range on -R option.  Default standard parallel is  the  equator.   For
              map  height,  max  dimension,  or  min  dimension,  append h, +, or - to the width,
              respectively.
              More details can be found in the psbasemap man pages.

              CYLINDRICAL PROJECTIONS:

              -Jclon0/lat0/scale (Cassini)
              -Jcyl_stere/[lon0/[lat0/]]scale (Cylindrical Stereographic)
              -Jj[lon0/]scale (Miller)
              -Jm[lon0/[lat0/]]scale (Mercator)
              -Jmlon0/lat0/scale (Mercator - Give meridian and standard parallel)
              -Jo[a]lon0/lat0/azimuth/scale (Oblique Mercator - point and azimuth)
              -Jo[b]lon0/lat0/lon1/lat1/scale (Oblique Mercator - two points)
              -Joclon0/lat0/lonp/latp/scale (Oblique Mercator - point and pole)
              -Jq[lon0/[lat0/]]scale (Cylindrical Equidistant)
              -Jtlon0/[lat0/]scale (TM - Transverse Mercator)
              -Juzone/scale (UTM - Universal Transverse Mercator)
              -Jy[lon0/[lat0/]]scale (Cylindrical Equal-Area)

              CONIC PROJECTIONS:

              -Jblon0/lat0/lat1/lat2/scale (Albers)
              -Jdlon0/lat0/lat1/lat2/scale (Conic Equidistant)
              -Jllon0/lat0/lat1/lat2/scale (Lambert Conic Conformal)
              -Jpoly/[lon0/[lat0/]]scale ((American) Polyconic)

              AZIMUTHAL PROJECTIONS:

              -Jalon0/lat0[/horizon]/scale (Lambert Azimuthal Equal-Area)
              -Jelon0/lat0[/horizon]/scale (Azimuthal Equidistant)
              -Jflon0/lat0[/horizon]/scale (Gnomonic)
              -Jglon0/lat0[/horizon]/scale (Orthographic)
              -Jglon0/lat0/altitude/azimuth/tilt/twist/Width/Height/scale (General Perspective).
              -Jslon0/lat0[/horizon]/scale (General Stereographic)

              MISCELLANEOUS PROJECTIONS:

              -Jh[lon0/]scale (Hammer)
              -Ji[lon0/]scale (Sinusoidal)
              -Jkf[lon0/]scale (Eckert IV)
              -Jk[s][lon0/]scale (Eckert VI)
              -Jn[lon0/]scale (Robinson)
              -Jr[lon0/]scale (Winkel Tripel)
              -Jv[lon0/]scale (Van der Grinten)
              -Jw[lon0/]scale (Mollweide)

              NON-GEOGRAPHICAL PROJECTIONS:

              -Jp[a]scale[/origin][r|z] (Polar coordinates (theta,r))
              -Jxx-scale[d|l|ppow|t|T][/y-scale[d|l|ppow|t|T]] (Linear, log, and power scaling)

       -R     xmin, xmax, ymin, and ymax specify the Region of interest.  For geographic regions,
              these limits correspond to west, east, south, and north and you may specify them in
              decimal degrees or in [+-]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, specify the name of an existing grid
              file and the -R settings (and grid spacing, if  applicable)  are  copied  from  the
              grid.   For  calendar  time  coordinates  you  may  either  give  (a) relative time
              (relative to the selected TIME_EPOCH and in the selected  TIME_UNIT;  append  t  to
              -JX|x),  or  (b)  absolute time of the form [date]T[clock] (append T to -JX|x).  At
              least one of date and clock must be present; the T is always  required.   The  date
              string must be of the form [-]yyyy[-mm[-dd]] (Gregorian calendar) or yyyy[-Www[-d]]
              (ISO week calendar), while the clock string must be  of  the  form  hh:mm:ss[.xxx].
              The  use  of  delimiters  and their type and positions must be exactly as indicated
              (however, input, output and plot formats are customizable; see gmtdefaults).

OPTIONS

       No space between the option flag and the associated arguments.

       -A     By default 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 lines along parallels, for example).

       -B     Sets map boundary annotation and tickmark intervals; see the psbasemap man page for
              all the details.

       -C     Give a color palette file.  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 line or polygon file (requires -m)
              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 file.

       -D     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     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 (see SPECIFYING PENS below) [Defaults:  width  =  0.25p,
              color  =  black,  texture = solid].  A leading + will use the lookup color (via -C)
              for both symbol fill and error pen color, while a leading  -  will  set  error  pen
              color  and  turn off symbol fill.  If upper case X and/or Y is 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 4 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 to X
              (or Y) we draw a notched "box-and-whisker" symbol where the  notch  width  reflects
              the uncertainty in the median.  Then a 5th extra data column is expected to contain
              the number of points in the distribution.

       -G     Select color or pattern for filling of symbols or polygons [Default  is  no  fill].
              (See SPECIFYING FILL below).
              Note  when  -m  is  chosen,  psxy  will  search  for  -G  and -W strings in all the
              subheaders and let any values thus found over-ride the command line  settings  (see
              -m below).

       -H     Input  file(s) has header record(s).  If used, the default number of header records
              is N_HEADER_RECS.  Use -Hi if only input data should have header  records  [Default
              will  write  out header records if the input data have them]. Blank lines and lines
              starting with # are always skipped.

       -I     Use the supplied intens value (nominally in the -1 to + 1 range)  to  modulate  the
              fill color by simulating illumination [none].

       -K     More PostScript code will be appended later [Default terminates the plot system].

       -L     Force  closed  polygons:  connect  the  endpoints  of  the line-segment(s) and draw
              polygons.  Also, in concert with -C, -m, and -Z settings in the  headers  will  use
              the implied color for polygon fill [Default is polygon pen color].

       -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 system].

       -P     Selects  Portrait  plotting  mode  [Default is Landscape, see gmtdefaults to change
              this].

       -S     Plot symbols.  If present, size is symbol size in the  unit  set  in  .gmtdefaults4
              (unless  c,  i,  m,  or p is appended).  If size is not given it is expected in the
              third (or 4th if -C is used) column.  Any additional fields are shifted over by one
              column.   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 -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].   Note:
              if  you  give  both size and symbol via the input file you must use MEASURE_UNIT to
              indicate the units used for the symbol size.
              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.   Choose  between  these
              symbol codes:

       -S-    x-dash (-).  size is the length of a short horizontal line segment.

       -S+    plus (+).  size is diameter of circumscribing circle.

       -Sa    star.  size is diameter of circumscribing circle.

       -Sb    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 bbase to
              change this value.

       -SB    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 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 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  km  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.

       -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].

       -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 km instead of plot-distance units.  An exception occurs  for  a  linear
              projection in which we assume the dimensions are given in the same units as -R.

       -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 64 characters).  Give size, and append /string
              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  %font  to  select  a  particular  font  [Default  is
              ANNOT_FONT_PRIMARY].

       -Sm    math  angle arc, optionally with one or two arrow heads.  The size is the radius of
              the arc.  Start and stop directions (in degrees counter-clockwise from  horizontal)
              for  arc  must  be  found  in columns 3 and 4.  Use -Smf to add arrow head at first
              angle, -Sml for arrow head at last angle, and -Smb for both [Default  is  no  arrow
              heads].

       -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|x|X]info[:labelinfo].  The required argument controls the placement of
              labels along the quoted lines.  Choose among five controlling algorithms:

              ddist[c|i|m|p] or Ddist[d|e|k|m|n]
                     For  lower  case  d,  give  distances  between  labels  on  the plot in your
                     preferred measurement unit c (cm), i (inch), m (meter), or p (points), while
                     for upper case D, specify distances in map units and append the unit; choose
                     among e (m), k (km), m (mile), n (nautical mile), or d  (spherical  degree).
                     [Default is 10c or 4i].

              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  start  and  stop  coordinates 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/stop, where start and
                     stop are either a specified point lon/lat or a 2-character XY key that  uses
                     the  justification format employed in pstext to indicate a point on the map,
                     given as [LCR][BMT].
                          L will interpret the point pairs as defining great circles [Default  is
                     straight line].

              nn_label
                     Specifies the number of equidistant labels for quoted lines line [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|m|p]  to  enforce  that  a minimum distance separation between
                     successive labels is enforced.

              x|Xxfile.d
                     Reads the multi-segment file xfile.d and places labels at the  intersections
                     between the quoted lines and the lines inxfile.d.  X will resample the lines
                     first along great-circle arcs.

              In addition, you may optionally append +rradius[c|i|m|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|m|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.

              +ffont Sets the desired font [Default ANNOT_FONT_PRIMARY].

              +g[color]
                     Selects  opaque  text boxes [Default is transparent]; optionally specify the
                     color [Default is PAGE_COLOR].  (See SPECIFYING COLOR below).

              +jjust Sets label justification [Default is MC].  Ignored when -SqN|n+|-1 is used.

              +kcolor
                     Sets color of text labels [Default is  COLOR_BACKGROUND].   (See  SPECIFYING
                     COLOR below).

              +llabel
                     Sets the constant label text.

              +Lflag Sets the label text according to the specified flag:

                     +Lh    Take  the  label from the current multisegment 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|m|p as the unit [Default is MEASURE_UNIT].

                     +LD    Calculate actual map distances; append d|e|k|m|n 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|m|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].

              +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  boxsets  [Default  is  no  outline];  optionally
                     specify  pen for outline [Default is width = 0.25p, color = black, texture =
                     solid].  (See SPECIFYING PENS below).

              +rmin_rad
                     Will not place labels where the line's radius  of  curvature  is  less  than
                     min_rad [Default is 0].

              +ssize Sets the desired font size in points [Default is 9].

              +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].

              +=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].

       -Sr    rectangle.  No size needs to be specified, but the  x-  and  y-dimensions  must  be
              found in columns 3 and 4.

       -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    unit    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.   To center vector on balance point, use -Svb; to align point with the
              vector head, use -Svh; to align point with the vector tail, use -Svt [Default].  To
              give the head point's coordinates instead of direction and length, use -Svs.  Upper
              case B, H, T, S will draw a double-headed vector [Default is single head].

       -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.)

       -Sw    pie  wedge.   Start  and  stop  directions  (in  degrees   counter-clockwise   from
              horizontal) for pie slice must be found in columns 3 and 4.

       -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.)

       -Sx    cross (x).  size is diameter of circumscribing circle.

       -Sy    y-dash (|).  size is the length of a short vertical line segment.

       -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     Draw  Unix  System time stamp on plot.  By adding just/dx/dy/, the user may specify
              the justification of the stamp and where the stamp should fall on the page relative
              to  lower  left  corner of the plot.  For example, BL/0/0 will align the lower left
              corner of the time stamp with the lower  left  corner  of  the  plot.   Optionally,
              append  a  label,  or  c (which will plot the command string.).  The GMT parameters
              UNIX_TIME, UNIX_TIME_POS, and UNIX_TIME_FORMAT can affect the appearance;  see  the
              gmtdefaults man page for details.  The time string will be in the locale set by the
              environment variable TZ (generally local time).

       -V     Selects verbose mode, which will send progress  reports  to  stderr  [Default  runs
              "silently"].

       -W     Set  pen  attributes  for lines or the outline of symbols [Defaults: width = 0.25p,
              color = black, texture = 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.  (See SPECIFYING PENS below).

       -X -Y  Shift  plot  origin  relative  to  the  current  origin  by  (x-shift,y-shift)  and
              optionally  append  the  length  unit (c, i, m, p).  You can prepend a to shift the
              origin back to the original position after plotting, or  prepend   r  [Default]  to
              reset  the  current origin to the new location.  If -O is used then the default (x-
              shift,y-shift)  is  (0,0),  otherwise  it  is  (r1i,  r1i)   or   (r2.5c,   r2.5c).
              Alternatively,  give c to align the center coordinate (x or y) of the plot with the
              center of the page based on current page size.

       -:     Toggles between (longitude,latitude) and (latitude,longitude) input and/or  output.
              [Default  is  (longitude,latitude)].   Append i to select input only or o to select
              output only.  [Default affects both].

       -bi    Selects binary input.  Append s for  single  precision  [Default  is  d  (double)].
              Uppercase  S or D will force byte-swapping.  Optionally, append ncol, the number of
              columns in your binary input file if it exceeds the columns needed by the  program.
              Or  append  c  if  the  input  file  is netCDF. Optionally, append var1/var2/... to
              specify the variables to be read.  [Default is the required number of columns given
              the chosen settings].

       -c     Specifies the number of plot copies. [Default is 1].

       -f     Special  formatting  of  input  and/or  output columns (time or geographical data).
              Specify i or o to make this apply only to  input  or  output  [Default  applies  to
              both].   Give one or more columns (or column ranges) separated by commas.  Append T
              (absolute calendar time), t (relative time in chosen TIME_UNIT since TIME_EPOCH), x
              (longitude),  y  (latitude),  or  f (floating point) to each column or column range
              item.  Shorthand -f[i|o]g means -f[i|o]0x,1y (geographic coordinates).

       -g     Examine the spacing between consecutive data points in order to  impose  breaks  in
              the line.  Append x|X or y|Y to define a gap when there is a large enough change in
              the x or y coordinates, respectively, or d|D for distance gaps; use upper  case  to
              calculate  gaps  from  projected coordinates.  For gap-testing on other columns use
              [col]z; if col is not prepended the it defaults to 2 (i.e.,  3rd  column).   Append
              [+|-]gap  and  optionally  a  unit u.  Regarding optional signs: -ve means previous
              minus current column value must exceed |gap to be a gap, +ve  means  current  minus
              previous  column value must exceed gap, and no sign means the absolute value of the
              difference must exceed gap.  For geographic data (x|y|d), the unit u may  be  meter
              [Default], kilometer, miles, or nautical miles.  For projected data (X|Y|D), choose
              from inch, centimeter, meter, or points [Default unit set by MEASURE_UNIT].   Note:
              For  x|y|z  with time data the unit is instead controlled by TIME_UNIT.  Repeat the
              option to specify multiple criteria, of which any can be  met  to  produce  a  line
              break.   Issue an additional -ga to indicate that all criteria must be met instead.
              The -g option is ignored if -S is set.

       -m     Multiple segment file.  Segments are separated by a record whose first character is
              flag [Default is '>']. On these segment header records one or more of the following
              options can be added:
              -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- Turn outline off
              -W+ Revert to default pen (none if not set on command line)
              -Zzval Obtain fill via cpt lookup using z-value zval
              -ZNaN Get the NaN color from the cpt file

   SPECIFYING PENS
       pen    The attributes of  lines  and  symbol  outlines  as  defined  by  pen  is  a  comma
              delimetered list of width, color and texture, each of which is optional.  width can
              be  indicated  as  a  measure  (points,   centimeters,   inches)   or   as   faint,
              thin[ner|nest],  thick[er|est],  fat[ter|test],  or  obese.  color specifies a gray
              shade or color (see SPECIFYING COLOR below).  texture is a  combination  of  dashes
              `-' and dots `.'.

   SPECIFYING FILL
       fill   The  attribute  fill specifies the solid shade or solid color (see SPECIFYING COLOR
              below) or the pattern  used  for  filling  polygons.   Patterns  are  specified  as
              pdpi/pattern,  where pattern gives the number of the built-in pattern (1-90) or the
              name of a Sun 1-, 8-, or 24-bit raster file. The dpi sets  the  resolution  of  the
              image.   For   1-bit  rasters:  use  Pdpi/pattern  for  inverse  video,  or  append
              :Fcolor[B[color]] to specify fore-  and  background  colors  (use  color  =  -  for
              transparency).   See  GMT Cookbook & Technical Reference Appendix E for information
              on individual patterns.

   SPECIFYING COLOR
       color  The color of lines, areas and patterns can be specified by a valid color name; by a
              gray  shade  (in  the  range  0-255); by a decimal color code (r/g/b, each in range
              0-255; h-s-v, ranges 0-360, 0-1, 0-1; or c/m/y/k, each  in  range  0-1);  or  by  a
              hexadecimal  color  code (#rrggbb, as used in HTML).  See the gmtcolors manpage for
              more information and a full list of color names.

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, use

       psxy DSDP.xy -R 150/154/18/23 -Jm 5c -Sc0.25c -G red -B 1g15m | 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, use

       psxy quakes.xyzm -R 0/1000/0/1000 -JX 6i -Sc -C cpt -B 200 > 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 -R 150/200/20/50 -Jm 0.15i -Sf0.8i/0.1ilt -G white -W -B 10 | 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, use

       psxy misc.d -R 0/100/-50/100 -JX 6i -S -C cpt -B 20 > t.ps

CUSTOM SYMBOLS

       psxy  and psxyz allows users to define and plot their own custom symbols.  This is done by
       encoding the symbol using a simple plotting code described below.  Put  all  the  plotting
       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 and psxyz  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.
       Generate freeform polygons by starting with an anchor point (append [ -Wpen ] and [ -Gfill
       ] to indicate pen and fill attributes):
            x0   y0   M
       and draw a straight line from the current point to the next point with
            x    y    D
       or add an arc by using
            xc   yc   r    dir1 dir2 A
       When a record other than the D or A is encountered, the polygon is closed  and  considered
       complete.  The optional pen and fill setting hardwires particular values for this feature.
       If not present the polygon's characteristics are determined by the command  line  settings
       for  pen  and fill.  To deactivate fill or outline for any given polygon, give -G- or -W-.
       To add other geometric shapes to your custom symbol, add any number of the following  plot
       code records (each accepts the optional [ -Wpen ] and [ -Gfill ] at the end):

       circle:   x    y    size c
       cross:    x    y    size x
       diamond:  x    y    size d
       ellipse:  x    y    dir  major     minor     e
       hexagon:  x    y    size h
       invtriangle:   x    y    size i
       letter:   x    y    size string    l
       octagon:  x    y    size g
       pentagon: x    y    size n
       plus:     x    y    size +
       rect:     x    y    xwidth    ywidth    r
       square:   x    y    size s
       star:     x    y    size a
       triangle: x    y    size t
       wedge:    x    y    radius    dir1 dir2 w
       x-dash:   x    y    size -
       y-dash:   x    y    size y

       When designing your symbol, the x, y and other dimensions are relative to a symbol of size
       1, and all the dimensions will be scaled by the actual symbol size chosen at run-time.  To
       design  a symbol, make a grid paper with psbasemap -R-0.5/0.5/-0.5/0.5 -JX 4i -Ba 0.1g0.05
       -P > grid.ps and draw your symbol, centering it on (0,0).  For examples  of  symbols,  see
       the set supplied with GMT in $GMT_SHAREDIR/custom.

BUGS

       The  -N option does not adjust the BoundingBox information so you may have to post-process
       the PostScript output with ps2raster -A to obtain the 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 original polygon.

SEE ALSO

       GMT(1), gmtcolors(5), psbasemap(1), psxyz(1)