.TH PSCONTOUR 1gmt "15 Jul 2011" "GMT 4.5.7" "Generic Mapping Tools"
.SH NAME
pscontour \- Contour xyz-data by direct triangulation [method]
.SH SYNOPSIS
\fBpscontour\fP \fIxyzfile\fP \fB\-C\fP\fIcptfile\fP \fB\-J\fP\fIparameters\fP \fB\-R\fP\fIwest\fP/\fIeast\fP/\fIsouth\fP/\fInorth\fP[\fBr\fP] 
[ \fB\-A\fP[\fB-\fP][\fIlabelinfo\fP] ] [ \fB\-B\fP[\fBp\fP|\fBs\fP]\fIparameters\fP ] [ \fB\-D\fP[\fIdumpfile\fP] ] [ \fB\-E\fP\fIazim\fP/\fIelev\fP[\fB+w\fP\fIlon\fP/\fIlat\fP[/\fIz\fP]][\fB+v\fP\fIx0\fP/\fIy0\fP] ] 
[ \fB\-G\fP[\fBd\fP|\fBf\fP|\fBn\fP|\fBl\fP|\fBL\fP|\fBx\fP|\fBX\fP]\fIparams\fP ] [ \fB\-H\fP[\fBi\fP][\fInrec\fP] ] [ \fB\-I\fP ] [ \fB\-K\fP ] 
[ \fB\-L\fP\fIpen\fP ] [ \fB\-N\fP ] [ \fB\-O\fP ] [ \fB\-P\fP ] [ \fB\-S\fP ] [ \fB\-T\fP\fIindexfile\fP ] [ \fB\-U\fP[\fIjust\fP/\fIdx\fP/\fIdy\fP/][\fBc\fP|\fIlabel\fP] ] 
[ \fB\-V\fP ] [ \fB\-W\fP[\fB+\fP]\fIpen\fP ] [ \fB\-X\fP[\fBa\fP|\fBc\fP|\fBr\fP][\fIx-shift\fP[\fBu\fP]] ] 
[ \fB\-Y\fP[\fBa\fP|\fBc\fP|\fBr\fP][\fIy-shift\fP[\fBu\fP]] ] [ \fB\-c\fP\fIcopies\fP ] [ \fB\-:\fP[\fBi\fP|\fBo\fP] ] [ \fB\-b\fP[\fBi\fP|\fBo\fP][\fBs\fP|\fBS\fP|\fBd\fP|\fBD\fP[\fIncol\fP]|\fBc\fP[\fIvar1\fP\fB/\fP\fI...\fP]] ] [ \fB\-m\fP[\fIflag\fP] ]
.SH DESCRIPTION
\fBpscontour\fP 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 Shewchuk's [1996]\"'
or Watson's [1982] method as selected during \fBGMT\fP installation; type
\fBpscontour \-\fP to see which method is selected), 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.
.TP
\fIxyzfile\fP
Raw ASCII (or binary, see \fB\-b\fP) xyz data to be contoured.
.TP
\fB\-C\fP
name of the color palette file.  Must have discrete colors if you want to paint the
surface (\fB\-I\fP).  Only contours that have annotation flags set will be annotated.
.TP
\fB\-J\fP
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 \fBMEASURE_UNIT\fP setting in \.gmtdefaults4, but this can be
overridden on the command line by appending \fBc\fP, \fBi\fP, or \fBm\fP to the scale/width value.
When central meridian is optional, default is center of longitude range on \fB\-R\fP option.
Default standard parallel is the equator.
For map height, max dimension, or min dimension, append \fBh\fP, \fB+\fP, or \fB-\fP to the width,
respectively.
.br
More details can be found in the \fBpsbasemap\fP man pages.
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\fBCYLINDRICAL PROJECTIONS:\fP
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\fB\-Jc\fP\fIlon0/lat0/scale\fP (Cassini)
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\fB\-Jcyl_stere\fP/[\fIlon0/\fP[\fIlat0/\fP]]\fIscale\fP (Cylindrical Stereographic)
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\fB\-Jj\fP[\fIlon0/\fP]\fIscale\fP (Miller)
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\fB\-Jm\fP[\fIlon0\fP/[\fIlat0/\fP]]\fIscale\fP (Mercator)
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\fB\-Jm\fP\fIlon0/lat0/scale\fP (Mercator - Give meridian and standard parallel)
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\fB\-Jo\fP[\fBa\fP]\fIlon0/lat0/azimuth/scale\fP (Oblique Mercator - point and azimuth)
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\fB\-Jo\fP[\fBb\fP]\fIlon0/lat0/lon1/lat1/scale\fP (Oblique Mercator - two points)
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\fB\-Joc\fP\fIlon0/lat0/lonp/latp/scale\fP (Oblique Mercator - point and pole)
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\fB\-Jq\fP[\fIlon0/\fP[\fIlat0/\fP]]\fIscale\fP (Cylindrical Equidistant)
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\fB\-Jt\fP\fIlon0/\fP[\fIlat0/\fP]\fIscale\fP (TM - Transverse Mercator)
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\fB\-Ju\fP\fIzone/scale\fP (UTM - Universal Transverse Mercator)
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\fB\-Jy\fP[\fIlon0/\fP[\fIlat0/\fP]]\fIscale\fP (Cylindrical Equal-Area) 
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\fBCONIC PROJECTIONS:\fP
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\fB\-Jb\fP\fIlon0/lat0/lat1/lat2/scale\fP (Albers)
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\fB\-Jd\fP\fIlon0/lat0/lat1/lat2/scale\fP (Conic Equidistant)
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\fB\-Jl\fP\fIlon0/lat0/lat1/lat2/scale\fP (Lambert Conic Conformal)
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\fB\-Jpoly\fP/[\fIlon0/\fP[\fIlat0/\fP]]\fIscale\fP ((American) Polyconic)
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\fBAZIMUTHAL PROJECTIONS:\fP
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\fB\-Ja\fP\fIlon0/lat0\fP[\fI/horizon\fP]\fI/scale\fP (Lambert Azimuthal Equal-Area)
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\fB\-Je\fP\fIlon0/lat0\fP[\fI/horizon\fP]\fI/scale\fP (Azimuthal Equidistant)
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\fB\-Jf\fP\fIlon0/lat0\fP[\fI/horizon\fP]\fI/scale\fP (Gnomonic)
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\fB\-Jg\fP\fIlon0/lat0\fP[\fI/horizon\fP]\fI/scale\fP (Orthographic)
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\fB\-Jg\fP\fIlon0/lat0/altitude/azimuth/tilt/twist/Width/Height/scale\fP (General Perspective).
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\fB\-Js\fP\fIlon0/lat0\fP[\fI/horizon\fP]\fI/scale\fP (General Stereographic)
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\fBMISCELLANEOUS PROJECTIONS:\fP
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\fB\-Jh\fP[\fIlon0/\fP]\fIscale\fP (Hammer)
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\fB\-Ji\fP[\fIlon0/\fP]\fIscale\fP (Sinusoidal)
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\fB\-Jkf\fP[\fIlon0/\fP]\fIscale\fP (Eckert IV)
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\fB\-Jk\fP[\fBs\fP][\fIlon0/\fP]\fIscale\fP (Eckert VI)
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\fB\-Jn\fP[\fIlon0/\fP]\fIscale\fP (Robinson)
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\fB\-Jr\fP[\fIlon0/\fP]\fIscale\fP (Winkel Tripel)
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\fB\-Jv\fP[\fIlon0/\fP]\fIscale\fP (Van der Grinten)
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\fB\-Jw\fP[\fIlon0/\fP]\fIscale\fP (Mollweide)
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\fBNON-GEOGRAPHICAL PROJECTIONS:\fP
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\fB\-Jp\fP[\fBa\fP]\fIscale\fP[\fI/origin\fP][\fBr\fP|\fBz\fP] (Polar coordinates (theta,r))
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\fB\-Jx\fP\fIx-scale\fP[\fBd\fP|\fBl\fP|\fBp\fP\fIpow\fP|\fBt\fP|\fBT\fP][\fI/y-scale\fP[\fBd\fP|\fBl\fP|\fBp\fP\fIpow\fP|\fBt\fP|\fBT\fP]] (Linear, log, and power scaling)
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.TP
\fB\-R\fP
\fIxmin\fP, \fIxmax\fP, \fIymin\fP, and \fIymax\fP specify the Region of interest.  For geographic
regions, these limits correspond to \fIwest, east, south,\fP and \fInorth\fP and you may specify them
in decimal degrees or in [+-]dd:mm[:ss.xxx][W|E|S|N] format.  Append \fBr\fP if lower left and upper right
map coordinates are given instead of w/e/s/n.  The two shorthands \fB\-Rg\fP and \fB\-Rd\fP 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 \fB\-R\fP 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 \fBTIME_EPOCH\fP and in the selected \fBTIME_UNIT\fP; append \fBt\fP to
\fB\-JX\fP|\fBx\fP), or (b) absolute time of the form [\fIdate\fP]\fBT\fP[\fIclock\fP]
(append \fBT\fP to \fB\-JX\fP|\fBx\fP).  At least one of \fIdate\fP and \fIclock\fP
must be present; the \fBT\fP is always required.  The \fIdate\fP string must be of the form [-]yyyy[-mm[-dd]]
(Gregorian calendar) or yyyy[-Www[-d]] (ISO week calendar), while the \fIclock\fP 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 \fBgmtdefaults\fP). 
.SH OPTIONS
No space between the option flag and the associated arguments.
.TP
\fB\-A\fP
Give - to disable all annotations.
The optional \fIlabelinfo\fP controls the specifics of the label formatting and consists of a concatenated string
made up of any of the following control arguments:
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.RS
.TP
\fB+a\fP\fIangle\fP
For annotations at a fixed angle, \fB+an\fP for line-normal, or \fB+ap\fP for line-parallel [Default].
.TP
\fB+c\fP\fIdx\fP[/\fIdy\fP]
Sets the clearance between label and optional text box.  Append \fBc|i|m|p\fP to specify
the unit or % to indicate a percentage of the label font size [15%].
.TP
\fB+d\fP
Turns on debug which will draw helper points and lines to illustrate the workings of the quoted line setup.
.TP
\fB+f\fP\fIfont\fP
Sets the desired font [Default \fBANNOT_FONT_PRIMARY\fP].
.TP
\fB+g\fP[\fIcolor\fP]
Selects opaque text boxes [Default is transparent]; optionally specify the color [Default is \fBPAGE_COLOR\fP].
(See SPECIFYING COLOR below).
.TP
\fB+j\fP\fIjust\fP
Sets label justification [Default is MC].  Ignored when -SqN|n+|-1 is used.
.TP
\fB+k\fP\fIcolor\fP
Sets color of text labels [Default is \fBCOLOR_BACKGROUND\fP].
(See SPECIFYING COLOR below).
.TP
\fB+l\fP\fIlabel\fP
Sets the constant label text.
.TP
\fB+L\fP\fIflag\fP
Sets the label text according to the specified flag:
.RS
.TP
\fB+Lh\fP
Take the label from the current multisegment header (first scan for an embedded
\fB\-L\fP\fIlabel\fP option, if not use the first word following the segment flag).
For multiple-word labels, enclose entire label in double quotes.
.TP
\fB+Ld\fP
Take the Cartesian plot distances along the line as the label; append \fBc|i|m|p\fP
as the unit [Default is \fBMEASURE_UNIT\fP].
.TP
\fB+LD\fP
Calculate actual map distances; append \fBd|e|k|m|n\fP as the unit [Default is \fBd\fP(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.
.TP
\fB+Lf\fP
Use text after the 2nd column in the fixed label location file as the label.  Requires the fixed label
location setting.
.TP
\fB+Lx\fP
As \fB+Lh\fP but use the headers in the \fIxfile.d\fP instead.  Requires the crossing file option.
.RE
.TP
\fB+n\fP\fIdx\fP[/\fIdy\fP]
Nudges the placement of labels by the specified amount (append \fBc|i|m|p\fP to specify the units).
Increments are considered in the coordinate system defined by the orientation of the line; use
\fB+N\fP to force increments in the plot x/y coordinates system [no nudging].
.TP
\fB+o\fP
Selects rounded rectangular text box [Default is rectangular].  Not applicable for curved text (\fB+v\fP) and
only makes sense for opaque text boxes.
.TP
\fB+p\fP[\fIpen\fP]
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).
.TP
\fB+r\fP\fImin_rad\fP
Will not place labels where the line's radius of curvature is less than \fImin_rad\fP [Default is 0].\"'
.TP
\fB+s\fP\fIsize\fP
Sets the desired font size in points [Default is 9].
.TP
\fB+u\fP\fIunit\fP
Appends \fIunit\fP to all line labels. If \fIunit\fP starts with a leading hyphen (-) then there will be no space
between label value and the unit.
[Default is no unit].
.TP
\fB+v\fP
Specifies curved labels following the path [Default is straight labels].
.TP
\fB+w\fP
Specifies how many (\fIx, y\fP) points will be used to estimate label angles [Default is 10].
.TP
\fB+=\fP\fIprefix\fP
Prepends \fIprefix\fP to all line labels.
If \fIprefix\fP starts with a leading hyphen (-) then there will be no space
between label value and the prefix. [Default is no prefix].
.RE
.TP
\fB\-B\fP
Sets map boundary annotation and tickmark intervals; see the
\fBpsbasemap\fP man page for all the details.
.TP
\fB\-D\fP
Dump the (x,y,z) coordinates of each contour to separate files, one for each contour segment. The
files will be named \fIdumpfile_cont_segment[_i]\fP.xyz, where \fIcont\fP is the contour value and
\fIsegment\fP is a running segment number for each contour interval (for closed contours we append _i.)
However, when \fB\-m\fP is used in conjunction with \fB\-D\fP a single multisegment file is created instead.
.TP
\fB\-E\fP
Sets the viewpoint's azimuth and elevation (for perspective view) [180/90].\"'
For frames used for animation, you may want to append \fB+\fP to fix the center
of your data domain (or specify a particular world coordinate point with \fB+w\fP\fIlon0\fP/\fIlat\fP[/\fIz\fP])
which will project to the center of your page size (or specify the coordinates
of the projected view point with \fB+v\fP\fIx0\fP/\fIy0).
.TP
\fB\-G\fP
Controls the placement of labels along the contours.
Choose among five controlling algorithms:
.RS
.TP
\fB\-G\fP\fBd\fP\fIdist\fP[\fBc\fP|\fBi\fP|\fBm\fP|\fBp\fP] or \fB\-G\fP\fBD\fP\fIdist\fP[\fBd\fP|\fBe\fP|\fBk\fP|\fBm\fP|\fBn\fP]
For lower case \fBd\fP, give distances between labels on the plot in your preferred measurement unit
\fBc\fP (cm), \fBi\fP (inch), \fBm\fP (meter), or \fBp\fP (points), while for upper case \fBD\fP, specify
distances in map units and append the unit; choose among \fBe\fP (m), \fBk\fP (km), \fBm\fP (mile), \fBn\fP
(nautical mile), or \fBd\fP (spherical degree).  [Default is 10\fBc\fP or 4\fBi\fP].  
.TP
\fB\-G\fP\fBf\fP\fIffile.d\fP
Reads the ascii file \fIffile.d\fP and places labels at locations in the file
that matches locations along the contours.
Inexact matches and points outside the region are skipped.
.TP
\fB\-G\fP\fBl|L\fP\fIline1\fP[,\fIline2\fP,...]
Give \fIstart\fP and \fIstop\fP coordinates for one or
more comma-separated straight line segments.  Labels will be placed where these lines intersect the
contours.  The format of each \fIline\fP specification is \fIstart/stop\fP, where \fIstart\fP and \fIstop\fP
are either a specified point \fIlon/lat\fP or a 2-character \fBXY\fP key that uses the justification
format employed in \fBpstext\fP to indicate a point on the map, given as [LCR][BMT].
\fB\-G\fP\fBL\fP will interpret the point pairs as defining great circles [Default is straight line].
.TP
\fB\-G\fP\fBn\fP\fIn_label\fP
Specifies the number of equidistant labels for contours line [1].
Upper case \fB\-G\fP\fBN\fP starts labeling exactly at the start of the line [Default centers them along the line].
\fB\-G\fP\fBN\fP-1 places one justified label at start, while \fB\-G\fP\fBN\fP+1 places one justified
label at the end of contours.
Optionally, append /\fImin_dist\fP[c|i|m|p] to enforce that a minimum distance separation
between successive labels is enforced.
.TP
\fB\-G\fP\fBx|X\fP\fIxfile.d\fP
Reads the multi-segment file \fIxfile.d\fP and places labels at the intersections
between the contours and the lines in\fIxfile.d\fP.  \fB\-G\fP\fBX\fP will resample the lines first along
great-circle arcs.
.P
In addition, you may optionally append \fB+r\fP\fIradius\fP[\fBc\fP|\fBi\fP|\fBm\fP|\fBp\fP] to set a minimum label separation in the
x-y plane [no limitation].
.RE
.TP
\fB\-H\fP
Input file(s) has header record(s).  If used, the default number of header records is \fBN_HEADER_RECS\fP.
Use \fB\-Hi\fP 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.
.TP
\fB\-I\fP
Color the triangles using the color palette table.
.TP
\fB\-Jz\fP
Sets the vertical scaling (for 3-D maps).  Same syntax as \fB\-Jx\fP.
.TP
\fB\-K\fP
More \fIPostScript\fP code will be appended later [Default terminates the plot system].
.TP
\fB\-L\fP
Draw the underlying triangular mesh using the specified pen attributes [Default is no mesh].
(See SPECIFYING PENS below).
.TP
\fB\-N\fP
Do NOT clip contours or image at the boundaries [Default will clip to fit inside region \fB\-R\fP].
.TP
\fB\-O\fP
Selects Overlay plot mode [Default initializes a new plot system].
.TP
\fB\-P\fP
Selects Portrait plotting mode [Default is Landscape, see \fBgmtdefaults\fP to change this].
.TP
\fB\-S\fP
Skip all input \fIxyz\fP points that fall outside the region [Default uses all the data in the triangulation].
.TP
\fB\-T\fP
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 \fBtriangulate\fP)].
.TP
\fB\-U\fP
Draw Unix System time stamp on plot.
By adding \fIjust/dx/dy/\fP, 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 \fIlabel\fP, or \fBc\fP (which will plot the command string.).
The \fBGMT\fP parameters \fBUNIX_TIME\fP, \fBUNIX_TIME_POS\fP, and \fBUNIX_TIME_FORMAT\fP can affect the appearance;
see the \fBgmtdefaults\fP man page for details.
The time string will be in the locale set by the environment variable \fBTZ\fP (generally local time).
.TP
\fB\-V\fP
Selects verbose mode, which will send progress reports to stderr [Default runs "silently"].
.TP
\fB\-W\fP
Select contouring and set contour pen attributes.  If the \fB+\fP flag is set then
the contour lines are colored according to the cpt file (see \fB\-C\fP).
(See SPECIFYING PENS below).
.TP
\fB\-X\fP \fB\-Y\fP
Shift plot origin relative to the current origin by (\fIx-shift,y-shift\fP) and
optionally append the length unit (\fBc\fP, \fBi\fP, \fBm\fP, \fBp\fP).
You can prepend \fBa\fP to shift the origin back to the original position after plotting,
or prepend  \fBr\fP [Default] to reset the current origin to the new location.
If \fB\-O\fP is used then the default (\fIx-shift,y-shift\fP) is (0,0), otherwise it is
(r1i, r1i) or (r2.5c, r2.5c).
Alternatively, give \fBc\fP to align the center coordinate (x or y) of the plot with the center of the page
based on current page size.
.TP
\fB\-:\fP
Toggles between (longitude,latitude) and (latitude,longitude) input and/or output.  [Default is (longitude,latitude)].
Append \fBi\fP to select input only or \fBo\fP to select output only.  [Default affects both].
.TP
\fB\-bi\fP
Selects binary input.
Append \fBs\fP for single precision [Default is \fBd\fP (double)].
Uppercase \fBS\fP or \fBD\fP will force byte-swapping.
Optionally, append \fIncol\fP, the number of columns in your binary input file
if it exceeds the columns needed by the program.
Or append \fBc\fP if the input file is netCDF. Optionally, append \fIvar1\fP\fB/\fP\fIvar2\fP\fB/\fP\fI...\fP to
specify the variables to be read.
[Default is 3 input columns].
Use 4-byte integer triplets for node ids (\fB\-T\fP).
.TP
\fB\-bo\fP
Selects binary output.
Append \fBs\fP for single precision [Default is \fBd\fP (double)].
Uppercase \fBS\fP or \fBD\fP will force byte-swapping.
Optionally, append \fIncol\fP, the number of desired columns in your binary output file.
[Default is 3 output columns].
.TP
\fB\-c\fP
Specifies the number of plot copies. [Default is 1].
.TP
\fB\-m\fP
When used in conjunction with \fB\-D\fP a single multisegment file is created, and
each contour section is preceded by a header record whose first column is \fIflag\fP
followed by the contour level.
.SS SPECIFYING PENS
.TP
\fIpen\fP
The attributes of lines and symbol outlines as defined by \fIpen\fP is a comma delimetered list of
\fIwidth\fP, \fIcolor\fP and \fItexture\fP, each of which is optional.
\fIwidth\fP can be indicated as a measure (points, centimeters, inches) or as \fBfaint\fP, \fBthin\fP[\fBner\fP|\fBnest\fP],
\fBthick\fP[\fBer\fP|\fBest\fP], \fBfat\fP[\fBter\fP|\fBtest\fP], or \fBobese\fP.
\fIcolor\fP specifies a gray shade or color (see SPECIFYING COLOR below).
\fItexture\fP is a combination of dashes `-' and dots `.'.
.SS SPECIFYING COLOR
.TP
\fIcolor\fP
The \fIcolor\fP 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 \fBgmtcolors\fP manpage for more information and a full list of color names.
.SH EXAMPLES
To make a raw contour plot from the file topo.xyz and drawing the contours (pen = 0.5p)
given in the color palette file topo.cpt on a Lambert map
at 0.5 inch/degree along the standard parallels 18 and 24, use 
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.sp
\fBpscontour\fP topo.xyz \fB\-R\fP320/330/20/30 \fB\-Jl\fP18/24/0.5\fBi\fP \fB\-C\fPtopo.cpt \fB\-W\fP0.5\fBp\fP > topo.ps
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.sp
To create a color \fIPostScript\fP plot of the numerical temperature solution obtained on a triangular mesh
whose node coordinates and temperatures are stored in temp.xyz and mesh arrangement is given by the file mesh.ijk, using
the colors in temp.cpt, run
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.sp
\fBpscontour\fP temp.xyz \fB\-R\fP0/150/0/100 \fB\-Jx\fP0.1 \fB\-C\fPtemp.cpt \fB\-G\fP \fB\-W\fP0.25\fBp\fP > temp.ps
.SH BUGS
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
\fBDOTS_PR_INCH\fP in the \.gmtdefaults4 file.
.SH "SEE ALSO"
.IR GMT (1),
.IR gmtcolors (5),
.IR grdcontour (1),
.IR grdimage (1),
.IR nearneighbor (1),
.IR psbasemap (1),
.IR psscale (1),
.IR surface (1),
.IR triangulate (1)
.SH REFERENCES
Watson, D. F., 1982, Acord: Automatic contouring of raw data, \fIComp. & Geosci., 8\fP, 97\-101.
.br
Shewchuk, 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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www.cs.cmu.edu/~quake/triangle.html