.TH PSVELO l "1 Feb 2002"
.SH NAME
psvelo \fR\- Plot velocity vectors, crosses, and wedges on maps
.SH SYNOPSIS
.br
psvelo \fIfiles \fB\-J\fIparameters \fB\-R\fIwest/east/south/north
\fR[ \fB\-B\fItickinfo\fR ]
[ \fB\-D\fIsigma_scale\fR ]
[ \fB\-F\fIred/green/blue\fR ]
[ \fB\-E\fIred/green/blue\fR ] [ \fB\-G\fIfill\fR ] [ \fB\-H\fR ] [ \fB\-K\fR ] [ \fB\-L\fP ] [ \fB\-N\fP ]
[ \fB\-O\fP ] [ \fB\-P\fP ] [ \fB\-S\fIsymbol/scale/conf/font_size\fR ] [ \fB\-U\fP[\fI/dx/dy/\fP][label] ]
[ \fB\-V\fP ] [ \fB\-W\fIpen\fR ]
[ \fB\-X\fIx-shift\fR ] [ \fB\-Y\fIy-shift\fR ] [ \fB\-:\fP ] [ \fB\-c\fIcopies\fR ]
.SH DESCRIPTION
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psvelo \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 psxy,
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been replaced by \fBpsvelo\fP and \fBpsmeca\fP.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, psvelo will read standard input.
.TP
.B \-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 .gmtdefaults, but this can be
overridden on the command line by appending the c, i, or m to the scale/width value.
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\fBCYLINDRICAL PROJECTIONS:\fP
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\fB\-Jc\fP\fIlon0/lat0/scale\fP (Cassini)
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\fB\-Jj\fP\fIlon0/scale\fP (Miller)
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\fB\-Jm\fP\fIscale\fP (Mercator - Greenwich and Equator as origin)
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\fB\-Jm\fP\fIlon0/lat0/scale\fP (Mercator - Give meridian and standard parallel)
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\fB\-Joa\fP\fIlon0/lat0/azimuth/scale\fP (Oblique Mercator - point and azimuth)
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\fB\-Job\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/scale\fP (Equidistant Cylindrical Projection (Plate Carree))
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\fB\-Jt\fP\fIlon0/scale\fP (TM - Transverse Mercator, with Equator as y = 0)
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\fB\-Jt\fP\fIlon0/lat0/scale\fP (TM - Transverse Mercator, set origin)
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\fB\-Ju\fP\fIzone/scale\fP (UTM - Universal Transverse Mercator)
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\fB\-Jy\fP\fIlon0/lats/scale\fP (Basic Cylindrical Projection)
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\fBAZIMUTHAL PROJECTIONS:\fP
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\fB\-Ja\fP\fIlon0/lat0/scale\fP (Lambert).
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\fB\-Je\fP\fIlon0/lat0/scale\fP (Equidistant).
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\fB\-Jf\fP\fIlon0/lat0/horizon/scale\fP (Gnomonic).
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\fB\-Jg\fP\fIlon0/lat0/scale\fP (Orthographic).
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\fB\-Js\fP\fIlon0/lat0/\fP[\fIslat/\fP]\fIscale\fP (General Stereographic)
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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 (Equidistant)
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\fB\-Jl\fP\fIlon0/lat0/lat1/lat2/scale\fP (Lambert)
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\fBMISCELLANEOUS PROJECTIONS:\fP
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\fB\-Jh\fP\fIlon0/scale\fP (Hammer)
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\fB\-Ji\fP\fIlon0/scale\fP (Sinusoidal)
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\fB\-Jk\fP[\fBf|s\fP]\fIlon0/scale\fP (Eckert IV (f) and VI (s))
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\fB\-Jn\fP\fIlon0/scale\fP (Robinson)
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\fB\-Jr\fP\fIlon0/scale\fP (Winkel Tripel)
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\fB\-Jv\fP\fIlon0/scale\fP (Van der Grinten)
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\fB\-Jw\fP\fIlon0/scale\fP (Mollweide)
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\fBNON-GEOGRAPHICAL PROJECTIONS:\fP
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\fB\-Jp\fP[\fBa\fP]\fIscale\fP[\fI/origin\fP] (polar (theta,r) coordinates, optional \fBa\fP for azimuths and offset theta [0])
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\fB\-Jx\fP\fIx-scale\fP[\fBl|p\fP\fIpow\fP][\fI/y-scale\fP[\fBl|p\fP\fIpow\fP]] (Linear, log, and power scaling)
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More details can be found in the \fBpsbasemap\fP manpages.
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.TP
.B \-R
\fIwest, east, south,\fP and \fInorth\fP specify the Region of interest. To specify boundaries
in degrees and minutes [and seconds], use the dd:mm[:ss] format. Append \fBr\fP if lower left and upper right
map coordinates are given instead of wesn.
\fB\-S\fRSelects 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 (-: option interchanges order)
.TP
.B 3,4
eastward, northward velocity (\fB-:\fR option interchanges order)
.TP
.B 5,6
uncertainty of eastward, northward velocities (1-sigma) (\fB-:\fR
option interchanges order)
.TP
.B 7
correlation between eastward and northward components
.TP
.B 8
name of station (optional). The bug which previously wrote a garbage
string if this argument was omitted has been fixed.
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.TP
\fB\-Sn\fIbarscale.\fR
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-:\fR option interchanges order)
.TP
.B 3,4
eastward, northward components of anisotropy vector (\fB-:\fR option interchanges order)
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.TP
\fB\-Sr\fIvelscale/confidence/fontsize. \fR 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-:\fR option interchanges order)
.TP
.B 3,4
eastward, northward velocity (\fB-:\fR option interchanges order)
.TP
.B 5,6
semi-major, semi-minor axes
.TP
.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\fIwedge_scale/wedge_mag. \fRRotational 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:
.TP
.B 1,2
longitude, latitude, of station (\fB-:\fR option interchanges order)
.TP
.B 3
rotation in radians
.TP
.B 4
rotation uncertainty in radians
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.TP
\fB\-Sx\fIcross_scale \fR 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-:\fR option interchanges order)
.TP
.B 3
eps1, the most extensional eigenvalue of strain tensor, with extension taken positive.
.TP
.B 4
eps2, the most compressional eigenvalue of strain tensor, with extension taken positive.
.TP
.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
.B \-A
\fIArrow_width/Head_length/Head_width \fR
Size of arrow in inches. [Default is 0.03/0.12/0.09].
.TP
.B \-B
Sets map boundary tickmark intervals. See \fBpsbasemap\fP for details.
.TP
\fB\-C
\fROffset focal mechanisms to the latitude and longitude specified in the last
two columns of the input file.
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.TP
\fB\-D
\fISigma_scale \fR
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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.TP
\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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.TP
\fB\-E\fP\fIfill\fP
\fRSets the color or shade used for filling uncertainty wedges (-Sw)
or velocity error ellipses (-Se or -Sr). [If -E is not specified, the
uncertainty regions will be transparent.]
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.TP
\fB\-G\fP\fIfill\fP
\fRSelect filling of ellipses, wedges, and focal mechanisms. By
convention, the compressional quadrants of the focal mechanism beach
balls are shaded. 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 (1-32) 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.
.TP
.B \-H
Input file(s) has Header record(s). Number of header records can be changed by editing
your \.gmtdefaults file. If used, \fBGMT\fP default is 1 header record.
.TP
.B \-K
More \fIPostScript\fP code will be appended later [Default terminates the plot system].
.TP
\fB\-L
\fRDraw lines. Ellipses and fault planes will have their outlines drawn using current pen (see \fB\-W\fP).
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.TP
\fB\-N
\fRDo \fBNOT\fR skip symbols that fall outside the frame boundary specified by \fB\-R\fR.
 [Default plots symbols inside frame only].
.TP
.B \-O
Selects Overlay plot mode [Default initializes a new plot system].
.TP
.B \-P
Selects Portrait plotting mode [\fBGMT\fP Default is Landscape, see gmtdefaults to change this].
.TP
.B \-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. Optionally,
append a label, or \fBc\fP (which will plot the command string.). The GMT parameters
UNIX_TIME and UNIX_TIME_POS can affect the appearance; see the \fBgmtdefaults\fP man
page for details.
.TP
.B \-V
Selects verbose mode, which will send progress reports to stderr [Default runs "silently"].
.TP
\fB\-W
\fRSet pen attributes for velocity arrows, ellipse circumference and fault plane edges.
 [Defaults: width = 1, color = 0/0/0, texture = solid].
.TP
.B \-X \-Y
Shift origin of plot by (\fIx-shift,y-shift\fP).
Prepend \fBa\fP for absolute coordinates;
the default (\fBr\fP) will reset plot origin.
.TP
.B \-:
Toggles between (longitude,latitude) and (latitude,longitude) input/output. [Default is (longitude,latitude)].
Applies to geographic coordinates only.
.TP
.B \-c
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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psvelo << END -H2 -R-10/10/-10/10 -W1/255/0/0 \.br
-G0/255/0 -L -Se0.2/0.39/18 -B1g1 -Jx0.4/0.4 \.br
-A0.1/0.3/0.3 -P -V >! 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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The 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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psvelo <<END -Sw0.4/1.e7 -W3 -G60 -E210 -H1 -D2 -Jm2.2 \.br
-R240./243./32.5/34.75 -Bf10ma60m/WeSn -P >! 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 (l),
.IR psbasemap (l)
.IR psxy (l)
.SH REFERENCES
.br
\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
.br
(Kurt.Feigl@.cnes.fr)
.br
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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)