pscontour - Contour xyz-data by direct triangulation


      pscontour xyzfile -Ccptfile -Jparameters -Rwest/east/south/north[r] [
      -A[ffont_size][aangle][/r/g/b][o]] ] [ -Btickinfo ] [ -D[dumpfile] ] [
      -Eview_az/view_el ] [ -Ggap ] [ -H[nrec] ] [ -I ] [ -K ] [ -Lpen ] [
      -M[flag] ] [ -N ] [ -O ] [ -P ] [ -Tindexfile ] [ -U[/dx/dy/][label] ]
      [ -V ] [ -W[+]pen ] [ -Xx-shift ] [ -Yy-shift ] [ -ccopies ] [ -: ] [
      -bi[s][n] ] [ -bo[s] ]


      pscontour reads an ASCII [or binary] xyz-file and produces a raw
      contour plot by triangulation.  By default, the optimal Delaunay
      triangulation is performed (using either Shewhuck's [1996] or Watson's
      [1982] method as selected during GMT installation), but the user may
      optionally provide a second file with network information, such as a
      triangular mesh used for finite element modeling.  In addition to
      contours, the area between contours may be painted according to the
      color palette file.

           Raw ASCII (or binary, see -b) xyz data to be contoured.

      -C   name of the color palette file.  Must have discrete colors if you
           want to paint the surface (-I).  Only contours that have
           anotation flags set will be anotated.

      -J   Selects the map projection. Scale is inch/degree, 1:xxxxx, or
           width in inch (upper case modifier).


           -Jclon0/lat0/scale (Cassini)
           -Jjlon0/scale (Miller)
           -Jmscale (Mercator - Greenwich and Equator as origin)
           -Jmlon0/lat0/scale (Mercator - Give meridian and standard
           -Joalon0/lat0/azimuth/scale (Oblique Mercator - point and
           -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 Carree))
           -Jtlon0/scale (TM - Transverse Mercator)
           -Juzone/scale (UTM - Universal Transverse Mercator)
           -Jylon0/lats/scale (Basic Cylindrical Projection)


           -Jalon0/lat0/scale (Lambert).
           -Jelon0/lat0/scale (Equidistant).
           -Jflon0/lat0/horizon/scale (Gnomonic).
           -Jglon0/lat0/scale (Orthographic).
           -Jslon0/lat0/scale (General Stereographic)


           -Jblon0/lat0/lat1/lat2/scale (Albers)
           -Jllon0/lat0/lat1/lat2/scale (Lambert)


           -Jhlon0/scale (Hammer)
           -Jilon0/scale (Sinusoidal)
           -Jklon0/scale (Eckert VI)
           -Jnlon0/scale (Robinson)
           -Jrlon0/scale (Winkel Tripel)
           -Jwlon0/scale (Mollweide)


           -Jpscale (Linear projection for polar (theta,r) coordinates)
           -Jxx-scale[l|ppow][/y-scale[l|ppow]] (Linear, log, and power
           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.


      No space between the option flag and the associated arguments.

      -A   Several anotation formatting options can be set to modify the
           form of the annotation.  Append ffont_size to change font size
           [9], append /r/g/b to change color of text fill box [PAGE_COLOR],
           append aangle to fix annotation angle [Default follows contour],
           and append o to draw the outline of the surrounding text box
           [Default is no outline].

      -B   Sets map boundary tickmark intervals. See psbasemap for details.

      -D   Dump the (x,y,z) coordinates of each contour to separate files,
           one for each contour segment. The files will be named
           dumpfile_cont_segment[_i].xyz, where cont is the contour value
           and segment is a running segment number for each contour interval
           (for closed contours we append _i.) However, when -M is used in
           conjunction with -D a single multisegment file is created

      -E   Sets the view point by specifying azimuth and elevation in
           degrees. [Default is 180/90]

      -G   gap is distance in inch between each annotation along the same
           contour [Default is 4i].

      -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.

      -I   Color the triangles using the color palette table.

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

      -L   Draw the underlying triangular mesh using the specified pen
           attributes [Default is no mesh].

      -M   When used in conjunction with -D a single multisegment file is
           created, and each contour section is preceeded by a header record
           whose first column is flag followed by the contour level.

      -N   Do NOT clip contours or image at the boundaries [Defaults will
           clip to fit inside region -R).

      -O   Selects Overlay plot mode [Default initializes a new plot

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

      -T   Give name of file with network information.  Each record must
           contain triplets of node numbers for a triangle [Default computes
           these using Delaunay triangulation (see triangulate)].

      -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 in inch [Default is (-0.75i/-
           0.75i)].  Optionally, append a label, or c (which will plot the
           command string.)

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

      -W   Select contouring and set contour pen attributes.  If the + flag
           is set then the contour lines are colored according to the cpt
           file (see -C).

      -X -Y
           Shift origin of plot by (x-shift,y-shift) inch  [Default is
           (a1i,a1i) for new plots, (0,0) for overlays].  Prepend a for
           absolute coordinates; the default (r) will reset plot origin.

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

      -:   Toggles between (longitude,latitude) and (latitude,longitude)
           input/output.  [Default is (longitude,latitude)].

      -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 3 input columns].  Use 4-byte integer
           triplets for node ids (-T).

      -bo  Selects binary output.  Append s for single precision [Default is


      To make a raw contour plot from the file and drawing the
      contours (pen = 2) given in the color palette file topo.cpt on a
      Lambert map at 0.5 inch/degree along the standard parallels 18 and 24,

      pscontour -R320/330/20/30 -Jl18/24/0.5i -Ctopo.cpt -W0.5p >

      To create a color PostScript plot of the numerical temperature
      solution obtained on a triangular mesh whose node coordinates and
      temperatures are stored in and mesh arrangement is given by
      the file mesh.ijk, using the colors in temp.cpt, try

      pscontour -R0/150/0/100 -Jx0.1 -Ctemp.cpt -G -W0.25p >


      Sometimes there will appear to be thin lines of the wrong color in the
      image.  This is a round-off problem which may be remedied by using a
      higher value of DOTS_PR_INCH in the .gmtdefaults file.


      gmt, grdcontour, grdimage, nearneighbor, psbasemap, psscale, surface,


      Watson, D. F., 1982, Acord: Automatic contouring of raw data, Comp. &
      Geosci., 8, 97-101.
      Shewchuck, J. R., 1996, Triangle: Engineering a 2D Quality Mesh
      Generator and Delaunay Triangulator, First Workshop on Applied
      Computational Geometry (Philadelphia, PA), 124-133, ACM, May 1996.

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