.TH PSVELO 1gmt "Feb 27 2014" "GMT 4.5.13 (SVN)" "Generic Mapping Tools"
.SH NAME
psvelo \- Plot velocity vectors, crosses, and wedges on maps
.SH SYNOPSIS
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\fBpsvelo\fP \fIfiles\fP \fB\-J\fP\fIparameters\fP \fB\-R\fP\fIwest\fP/\fIeast\fP/\fIsouth\fP/\fInorth\fP[\fBr\fP] [ \fB\-A\fP\fIArrow_width/Head_length/Head_width\fP ] [ \fB\-B\fP[\fBp\fP|\fBs\fP]\fIparameters\fP ] 
[ \fB\-D\fP\fIsigma_scale\fP ] [ \fB\-F\fP\fIcolor\fP ] 
[ \fB\-E\fP\fIcolor\fP ] [ \fB\-G\fP\fIfill\fP ] [ \fB\-H\fP[\fBi\fP][\fInrec\fP] ] [ \fB\-K\fP ] [ \fB\-L\fP ] [ \fB\-N\fP ] 
[ \fB\-O\fP ] [ \fB\-P\fP ] [ \fB\-S\fP\fIsymbol\fP/\fIscale\fP/\fIconf\fP/\fIfont_size\fP ] [ \fB\-U\fP[\fIjust\fP/\fIdx\fP/\fIdy\fP/][\fBc\fP|\fIlabel\fP] ] 
[ \fB\-V\fP ] [ \fB\-W\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\-:\fP[\fBi\fP|\fBo\fP] ] [ \fB\-c\fP\fIcopies\fP ]
.SH DESCRIPTION
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\fBpsvelo\fP \fRreads data values from \fIfiles\fP [or standard input]
and generates \fIPostScript\fP code that will plot 
velocity arrows on a map.  Most options are the same as for \fBpsxy\fP,
except \fB\-S\fP.  The \fIPostScript\fP code is written to standard
output. The previous version (\fBpsvelomeca\fP) is now obsolete. It has
been replaced by \fBpsvelo\fP and \fBpsmeca\fP.
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.SH ARGUMENTS
\fIfiles\fP
List one or more file-names. If no files are given, \fBpsvelo\fP will read standard input.
.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.
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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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\fB\-R\fP
\fIwest, east, south,\fP and \fInorth\fP specify the Region of interest, 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.
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\fB\-S\fP Selects the meaning of the columns in the data file and the
figure to be plotted.
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.TP
\fB\-Se\fP\fIvelscale/confidence/fontsize\fP.
Velocity ellipses in
(N,E) convention.  \fIVscale\fP sets the scaling of the velocity arrows.
This scaling gives inches (unless \fBc\fP, \fBi\fP, \fBm\fP, or \fBp\fP is appended).
\fIConfidence\fP sets the 2-dimensional confidence limit for
the ellipse, e.g., 0.95 for 95% confidence ellipse.  \fIFontsize\fP
sets the size of the text in points.  The ellipse will be filled with
the color or shade specified by the \fB\-G\fP option [default
transparent].  The arrow and the circumference of the ellipse will be
drawn with the pen attributes specified by the \fB\-W\fP option.
Parameters are expected to be in the following columns:
.TP
.B 1,2
longitude, latitude of station (\fB\-:\fP option interchanges order)
.TP
.B 3,4
eastward, northward velocity (\fB\-:\fP option interchanges order)
.TP
.B 5,6
uncertainty of eastward, northward velocities (1-sigma) (\fB\-:\fP
option interchanges order)
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.B 7
correlation between eastward and northward components
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.B 8
name of station (optional).
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.TP
\fB\-Sn\fP\fIbarscale.\fP
Anisotropy bars.  \fIBarscale\fP sets the scaling of the bars
This scaling gives inches (unless \fBc\fP, \fBi\fP, \fBm\fP, or \fBp\fP is appended).
Parameters are expected to be in the following columns:
.TP
.B 1,2
longitude, latitude of station (\fB\-:\fP option interchanges order)
.TP
.B 3,4
eastward, northward components of anisotropy vector (\fB\-:\fP option interchanges order)
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.TP
\fB\-Sr\fP\fIvelscale/confidence/fontsize\fP
Velocity ellipses in rotated convention.  \fIVscale\fP sets the scaling of the velocity
arrows. This scaling gives inches (unless \fBc\fP, \fBi\fP, \fBm\fP, or \fBp\fP is appended).
\fIConfidence\fP sets the 2-dimensional confidence limit for
the ellipse, e.g., 0.95 for 95% confidence ellipse.  \fIFontsize\fP
sets the size of the text in points.
The ellipse will be filled with the color or shade specified by the \fB\-G\fP option
[default transparent].  The arrow and the circumference of the ellipse will
be drawn with the pen attributes specified by the \fB\-W\fP option.
Parameters are expected to be in
the following columns:
.TP
.B 1,2
longitude, latitude, of station (\fB\-:\fP option interchanges order)
.TP
.B 3,4
eastward, northward velocity (\fB\-:\fP option interchanges order)
.TP
.B 5,6
semi-major, semi-minor axes
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.B 7
counter-clockwise angle, in degrees, from horizontal axis to major axis of ellipse.
.TP
.B 8
name of station (optional)
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.TP
\fB\-Sw\fP\fIwedge_scale/wedge_mag\fP.
Rotational wedges.
\fIWedge_scale\fP sets the size of the wedges in inches
(unless \fBc\fP, \fBi\fP, \fBm\fP, or \fBp\fP is appended).  Values are
multiplied by \fIWedge_mag\fP before plotting.  For example, setting
\fIWedge_mag\fP to 1.e7 works well for rotations of the order of 100
nanoradians/yr.  Use \fB\-G\fP to set the fill color or shade for the
wedge, and \fB\-E\fP to set the color or shade for the uncertainty.
Parameters are expected to be in the following columns:
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.B 1,2
longitude, latitude, of station (\fB\-:\fP option interchanges order)
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.B 3
rotation in radians
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.B 4
rotation uncertainty in radians
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.TP
\fB\-Sx\fP\fIcross_scale\fP
gives Strain crosses.  \fICross_scale\fP sets the
size of the cross in inches (unless \fBc\fP, \fBi\fP, \fBm\fP, or \fBp\fP 
is appended).  Parameters are expected to be in the
following columns:
.TP
.B 1,2
longitude, latitude, of station (\fB\-:\fP option interchanges order)
.TP
.B 3
eps1, the most extensional eigenvalue of strain tensor, with extension taken positive.
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.B 4
eps2, the most compressional eigenvalue of strain tensor, with extension taken positive.
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.B 5
azimuth of eps2 in degrees CW from North.
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.SH OPTIONS
No space between the option flag and the associated arguments.
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.TP
\fB\-A\fP
\fIArrow_width/Head_length/Head_width \fP
Size of arrow in inches.  [Default is 0.03/0.12/0.09].
.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
\fISigma_scale \fP
can be used to rescale the uncertainties of velocities (\fB\-Se\fP and
\fB\-Sr\fP) and rotations (\fB\-Sw\fP).  Can be combined with the
\fIconfidence \fP variable.
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\fB\-F\fP\fIfill\fP
\fRSets the color or shade used for frame and annotation. [Default is 0/0/0 (black)]
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\fB\-E\fP\fIfill\fP
\fRSets the color or shade used for filling uncertainty wedges (\fB\-Sw\fP)
or velocity error ellipses (\fB\-Se\fP or \fB\-Sr\fP).  [If \fB\-E\fP is not
specified, the uncertainty regions will be transparent.]
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\fB\-G\fP\fIfill\fP
Specify color (for symbols/polygons) or pattern (for polygons).
Set the shade (0\-255) or color (r/g/b) [Default is
0/0/0].  Optionally, specify \fB\-Gp\fP\fIicon_size/pattern\fP, where
\fIpattern\fP gives the number of the image pattern (1-90) OR the name
of a icon-format file.  \fIicon_size\fP sets the unit size in inches.
To invert black and white pixels, use \fB\-GP\fP instead of
\fB\-Gp\fP.  See \fBpspatterns\fP for information on individual
patterns.
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\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\-K\fP
More \fIPostScript\fP code will be appended later [Default terminates the plot system].
.TP
\fB\-L\fP
\fRDraw lines.  Ellipses and fault planes will have their outlines drawn using current pen (see \fB\-W\fP).
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\fB\-N\fP
\fRDo \fBNOT\fP skip symbols that fall outside the frame boundary specified by \fB\-R\fP.
 [Default plots symbols inside frame only].
.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\-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
\fRSet pen attributes for velocity arrows, ellipse circumference and fault plane edges.
 [Defaults: width = 1, color = 0/0/0, texture = solid].
.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\-c\fP
Specifies the number of plot copies. [Default is 1].
.SH EXAMPLES
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The following should make big red arrows with green ellipses, outlined
in red.  Note that the 39% confidence scaling will give an ellipse which
fits inside a rectangle of dimension Esig by Nsig.
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\fBpsvelo\fP << END \fB\-H\fP 2 \fB\-R\fP-10/10/-10/10 \fB\-W\fP 0.25p,red
\fB\-G\fP green \fB\-L\fP \fB\-Se\fP 0.2/0.39/18 \fB\-B\fP 1g1 \fB\-Jx\fP 0.4/0.4
\fB\-A\fP 0.1/0.3/0.3 \fB\-P\fP \fB\-V\fP  >! test.ps
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  Long.   Lat.   Evel   Nvel   Esig   Nsig  CorEN SITE
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  (deg)  (deg)    (mm/yr)        (mm/yr)
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   0.    -8.     0.0    0.0     4.0    6.0  0.500  4x6
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  -8.     5.     3.0    3.0     0.0    0.0  0.500  3x3
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   0.     0.     4.0    6.0     4.0    6.0  0.500
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  -5.    -5.     6.0    4.0     6.0    4.0  0.500  6x4
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   5.     0.    -6.0    4.0     6.0    4.0 -0.500  -6x4
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   0.    -5.     6.0   -4.0     6.0    4.0 -0.500  6x-4
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END
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This example should plot some residual rates of rotation in the
Western Transverse Ranges, California.  The wedges will be
dark gray, with light gray wedges to represent the 2-sigma
uncertainties.
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\fBpsvelo\fP <<END \fB\-Sw\fP 0.4/1.e7 \fB\-W\fP 0.75p \fB\-G\fP darkgray \fB\-E\fP lightgray \fB\-H\fP 1 \fB\-D\fP 2
\fB\-Jm\fP 2.2 \fB\-R\fP 240./243./32.5/34.75 \fB\-B\fP f10ma60m/WeSn \fB\-P\fP >! test.ps
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 lon     lat    spin(rad/yr) spin_sigma (rad/yr)
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241.4806 34.2073  5.65E-08 1.17E-08
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241.6024 34.4468 -4.85E-08 1.85E-08
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241.0952 34.4079  4.46E-09 3.07E-08
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241.2542 34.2581  1.28E-07 1.59E-08
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242.0593 34.0773 -6.62E-08 1.74E-08
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241.0553 34.5369 -2.38E-07 4.27E-08
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241.1993 33.1894 -2.99E-10 7.64E-09
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241.1084 34.2565  2.17E-08 3.53E-08
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END
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.SH "SEE ALSO"
.IR GMT (1),
.IR psbasemap (1),
.IR psxy (1)
.SH REFERENCES
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\fRBomford, G., Geodesy, 4th ed., Oxford University Press, 1980.
.SH AUTHORS
Kurt Feigl
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CNRS UMR 5562
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Toulouse, France
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(Kurt.Feigl@.cnes.fr)
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Genevieve Patau
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CNRS UMR 7580
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Seismology Dept.
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Institut de Physique du Globe de Paris
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(patau@ipgp.jussieu.fr)