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<H1><A NAME="SECTION00410000000000000000">
2.1 General Information</A>
</H1>
<P>
There are 17 <A NAME="tex2html163"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> programs that directly create or modify
plots (Table <A HREF="node50.html#tbl:plotprogs">2.1</A>); the remaining 43 are mostly concerned with data
processing. This session will focus on the task of plotting
lines, symbols, and text on maps. We will build on the skills
we acquired while familiarizing ourselves with the various
<A NAME="tex2html164"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> map projections as well as how to select a data domain
and boundary annotations.
<P>
<BR><P></P>
<DIV ALIGN="CENTER"><A NAME="725"></A>
<TABLE>
<CAPTION><STRONG>Table 2.1:</STRONG>
List of all 1-D and 2-D plotting programs in <A NAME="tex2html153"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A></CAPTION>
<TR><TD>
<DIV ALIGN="CENTER"><TABLE CELLPADDING=3 BORDER="1">
<TR><TD ALIGN="CENTER" COLSPAN=1><FONT SIZE="-1">
<I>Program</I></FONT></TD>
<TD ALIGN="CENTER" COLSPAN=1><FONT SIZE="-1"> <I>Purpose</I></FONT></TD>
</TR>
<TR><TD ALIGN="CENTER" COLSPAN=2><FONT SIZE="-1">
<I>BASEMAPS</I></FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
<A NAME="tex2html136"
HREF="../psbasemap.html"><I><B>psbasemap</B></I></A><A NAME="2434"></A> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Create an empty basemap frame with optional scale </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
<A NAME="tex2html137"
HREF="../pscoast.html"><I><B>pscoast</B></I></A><A NAME="2443"></A> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Plot coastlines, filled continents, rivers, and political borders </FONT></TD>
</TR>
<TR><TD ALIGN="CENTER" COLSPAN=2><FONT SIZE="-1">
<I>POINTS AND LINES</I></FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
<A NAME="tex2html138"
HREF="../pswiggle.html"><I><B>pswiggle</B></I></A><A NAME="2452"></A> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Draw spatial time-series along their <IMG
WIDTH="37" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img36.gif"
ALT="$(x,y)$">-tracks </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
<A NAME="tex2html139"
HREF="../psxy.html"><I><B>psxy</B></I></A><A NAME="2461"></A> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Plot symbols, polygons, and lines in 2-D </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
<A NAME="tex2html140"
HREF="../psxyz.html"><I><B>psxyz</B></I></A><A NAME="2470"></A> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Plot symbols, polygons, and lines in 3-D </FONT></TD>
</TR>
<TR><TD ALIGN="CENTER" COLSPAN=2><FONT SIZE="-1">
<I>HISTOGRAMS</I></FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
<A NAME="tex2html141"
HREF="../pshistogram.html"><I><B>pshistogram</B></I></A><A NAME="2479"></A> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Plot a rectangular histogram </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
<A NAME="tex2html142"
HREF="../psrose.html"><I><B>psrose</B></I></A><A NAME="2488"></A> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Plot a polar histogram(sector/rose diagram) </FONT></TD>
</TR>
<TR><TD ALIGN="CENTER" COLSPAN=2><FONT SIZE="-1">
<I>CONTOURS</I></FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
<A NAME="tex2html143"
HREF="../grdcontour.html"><I><B>grdcontour</B></I></A><A NAME="2497"></A> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Contouring of 2-D gridded data sets </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
<A NAME="tex2html144"
HREF="../pscontour.html"><I><B>pscontour</B></I></A><A NAME="2506"></A> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Direct contouring or imaging of <IMG
WIDTH="25" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img37.gif"
ALT="$xyz$"> data by optimal triangulation </FONT></TD>
</TR>
<TR><TD ALIGN="CENTER" COLSPAN=2><FONT SIZE="-1">
<I>SURFACES</I></FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
<A NAME="tex2html145"
HREF="../grdimage.html"><I><B>grdimage</B></I></A><A NAME="2515"></A> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Produce color images from 2-D gridded data </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
<A NAME="tex2html146"
HREF="../grdvector.html"><I><B>grdvector</B></I></A><A NAME="2524"></A> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Plot vector fields from 2-D gridded data </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
<A NAME="tex2html147"
HREF="../grdview.html"><I><B>grdview</B></I></A><A NAME="2533"></A> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> 3-D perspective imaging of 2-D gridded data </FONT></TD>
</TR>
<TR><TD ALIGN="CENTER" COLSPAN=2><FONT SIZE="-1">
<I>UTILITIES</I></FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
<A NAME="tex2html148"
HREF="../psclip.html"><I><B>psclip</B></I></A><A NAME="2542"></A> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Use polygon files to initiate custom clipping paths </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
<A NAME="tex2html149"
HREF="../psimage.html"><I><B>psimage</B></I></A><A NAME="2551"></A> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Plot Sun rasterfiles </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
<A NAME="tex2html150"
HREF="../psmask.html"><I><B>psmask</B></I></A><A NAME="2560"></A> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Create clipping paths or generate overlay to mask </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
<A NAME="tex2html151"
HREF="../psscale.html"><I><B>psscale</B></I></A><A NAME="2569"></A> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Plot grayscale or colorscale bar </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
<A NAME="tex2html152"
HREF="../pstext.html"><I><B>pstext</B></I></A><A NAME="2578"></A> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Plot textstrings on maps </FONT></TD>
</TR>
</TABLE><FONT SIZE="-1">
<A NAME="tbl:plotprogs"></A></FONT></DIV></TD></TR>
</TABLE>
</DIV><P></P>
<BR>
<P>
Plotting lines and symbols, <A NAME="tex2html165"
HREF="../psxy.html"><I><B>psxy</B></I></A><A NAME="2590"></A> is one of the most frequently
used programs in <A NAME="tex2html166"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A>. In addition to the common command line switches
it has numerous specific options, and expects different file formats
depending on what symbol has been selected. These circumstances makes
<A NAME="tex2html167"
HREF="../psxy.html"><I><B>psxy</B></I></A><A NAME="2602"></A> harder to master than most <A NAME="tex2html168"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> tools. Table <A HREF="node50.html#tbl:psxy">2.2</A>
shows a complete list of the options.
<P>
<BR><P></P>
<DIV ALIGN="CENTER"><A NAME="1723"></A>
<TABLE>
<CAPTION><STRONG>Table 2.2:</STRONG>
Optional switches in the <A NAME="tex2html156"
HREF="../psxy.html"><I><B>psxy</B></I></A><A NAME="2623"></A> program</CAPTION>
<TR><TD>
<DIV ALIGN="CENTER"><TABLE CELLPADDING=3 BORDER="1">
<TR><TD ALIGN="CENTER" COLSPAN=1><FONT SIZE="-1">
<I>Option</I></FONT></TD>
<TD ALIGN="CENTER" COLSPAN=1><FONT SIZE="-1"> <I>Purpose</I></FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-A</B> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Suppress line interpolation along great circles </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-C</B></FONT><FONT SIZE="-1"><I>cpt</I> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Let symbol color be determined from <IMG
WIDTH="10" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img38.gif"
ALT="$z$">-values and the </FONT><FONT SIZE="-1"><I>cpt</I> file </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-E</B>[</FONT><FONT SIZE="-1"><B>x</B><IMG
WIDTH="8" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img1.gif"
ALT="$\vert$"></FONT><FONT SIZE="-1"><B>X</B>][</FONT><FONT SIZE="-1"><B>y</B><IMG
WIDTH="8" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img1.gif"
ALT="$\vert$"></FONT><FONT SIZE="-1"><B>Y</B>][</FONT><FONT SIZE="-1"><I>cap</I>][/</FONT><FONT SIZE="-1"><I>pen</I>] </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Draw selected error bars with specified attributes </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-G</B></FONT><FONT SIZE="-1"><I>fill</I> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Set color for symbol or fill for polygons </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-L</B> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Explicitly close polygons </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-M</B>[</FONT><FONT SIZE="-1"><I>flag</I>] </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Multiple segment input data; headers start with </FONT><FONT SIZE="-1"><I>flag</I> </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-N</B> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Do Not clip symbols at map borders </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-S[symbol]</B>[</FONT><FONT SIZE="-1"><I>size</I>] </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Select one of 16 symbols (See Table <A HREF="node50.html#tbl:psxysymbols">2.3</A>) </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-W</B></FONT><FONT SIZE="-1"><I>pen</I> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Set </FONT><FONT SIZE="-1"><I>pen</I> for line or symbol outline </FONT></TD>
</TR>
</TABLE><FONT SIZE="-1">
<A NAME="tbl:psxy"></A></FONT></DIV></TD></TR>
</TABLE>
</DIV><P></P>
<BR>
<P>
The symbols can either be transparent (using <B>-W</B> only, not <B>-G</B>)
or solid (<B>-G</B>, with optional outline using <B>-W</B>). The <B>-S</B>
option takes the code for the desired symbol and optional size information.
If no symbol is given it is expected to be in the last column of the input
file. The size is optional since individual sizes for
symbols may be provided by the input data. The 15 symbols available to
us are
<P>
<BR><P></P>
<DIV ALIGN="CENTER"><A NAME="1726"></A>
<TABLE>
<CAPTION><STRONG>Table 2.3:</STRONG>
The symbol option in <A NAME="tex2html159"
HREF="../psxy.html"><I><B>psxy</B></I></A><A NAME="2654"></A>. Lower case symbols (<B>a, c, d, h, i, s, t, x</B>)
will fit inside a circle of given diameter. Upper case symbols (<B>A, C, D, H, I, S, T, X</B>) will have area equal to that of a circle of given diameter.</CAPTION>
<TR><TD><A NAME="774"></A>
<A NAME="775"></A>
<DIV ALIGN="CENTER"><TABLE CELLPADDING=3 BORDER="1">
<TR><TD ALIGN="CENTER" COLSPAN=1><FONT SIZE="-1">
<I>Option</I></FONT></TD>
<TD ALIGN="CENTER" COLSPAN=1><FONT SIZE="-1"> <I>Symbol</I></FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-Sa</B></FONT><FONT SIZE="-1"><I>size</I> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> st</FONT><FONT SIZE="-1"><B>a</B>r; </FONT><FONT SIZE="-1"><I>size</I> is radius of circumscribing circle </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-Sb</B></FONT><FONT SIZE="-1"><I>size</I>[/</FONT><FONT SIZE="-1"><I>base</I>][</FONT><FONT SIZE="-1"><B>u</B>] </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> </FONT><FONT SIZE="-1"><B>b</B>ar; </FONT><FONT SIZE="-1"><I>size</I> is bar width, append </FONT><FONT SIZE="-1"><B>u</B> if </FONT><FONT SIZE="-1"><I>size</I> is in </FONT><FONT SIZE="-1"><I>x</I>-units </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Bar extends from </FONT><FONT SIZE="-1"><I>base</I> [0] to the </FONT><FONT SIZE="-1"><I>y</I>-value </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-Sc</B></FONT><FONT SIZE="-1"><I>size</I> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> </FONT><FONT SIZE="-1"><B>c</B>ircle; </FONT><FONT SIZE="-1"><I>size</I> is the diameter </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-Sd</B></FONT><FONT SIZE="-1"><I>size</I> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> </FONT><FONT SIZE="-1"><B>d</B>iamond; </FONT><FONT SIZE="-1"><I>size</I> is its side </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-Se</B> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> </FONT><FONT SIZE="-1"><B>e</B>llipse; </FONT><FONT SIZE="-1"><I>direction</I> (CCW from horizontal), </FONT><FONT SIZE="-1"><I>major</I>, and </FONT><FONT SIZE="-1"><I>minor</I> axes in inches </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> are read from the input file </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-SE</B> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> </FONT><FONT SIZE="-1"><B>e</B>llipse; </FONT><FONT SIZE="-1"><I>azimuth</I> (CW from vertical), </FONT><FONT SIZE="-1"><I>major</I>, and </FONT><FONT SIZE="-1"><I>minor</I> axes in kilometers </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> are read from the input file</FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-Sf</B></FONT><FONT SIZE="-1"><I>gap</I>/</FONT><FONT SIZE="-1"><I>tick</I>[</FONT><FONT SIZE="-1"><B>l<IMG
WIDTH="8" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img1.gif"
ALT="$\vert$">L<IMG
WIDTH="8" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img1.gif"
ALT="$\vert$">r<IMG
WIDTH="8" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img1.gif"
ALT="$\vert$">R</B>] </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> </FONT><FONT SIZE="-1"><B>f</B>ault; </FONT><FONT SIZE="-1"><I>gap</I> and </FONT><FONT SIZE="-1"><I>tick</I> set length of and distance between ticks. </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> If </FONT><FONT SIZE="-1"><I>gap</I> <IMG
WIDTH="16" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img8.gif"
ALT="$<$"> 0 it means the number of ticks. </FONT><FONT SIZE="-1"><B>l</B> or </FONT><FONT SIZE="-1"><B>r</B> will draw ticks to left or right </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> side of line [Default is centered] </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Use upper case </FONT><FONT SIZE="-1"><B>L</B> or </FONT><FONT SIZE="-1"><B>R</B> to draw triangles instead of ticks </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-Sh</B></FONT><FONT SIZE="-1"><I>size</I> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> </FONT><FONT SIZE="-1"><B>h</B>exagon; </FONT><FONT SIZE="-1"><I>size</I> is its side </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-Si</B></FONT><FONT SIZE="-1"><I>size</I> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> </FONT><FONT SIZE="-1"><B>i</B>nverted triangle; </FONT><FONT SIZE="-1"><I>size</I> is its side </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-Sl</B></FONT><FONT SIZE="-1"><I>size</I>/</FONT><FONT SIZE="-1"><I>string</I>[%</FONT><FONT SIZE="-1"><I>font</I>] </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> </FONT><FONT SIZE="-1"><B>l</B>etter; </FONT><FONT SIZE="-1"><I>size</I> is fontsize. Append a letter or text string, and optionally a font </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-Sp</B> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> </FONT><FONT SIZE="-1"><B>p</B>oint; no size needed (1 pixel at current resolution is used) </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-Ss</B></FONT><FONT SIZE="-1"><I>size</I> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> </FONT><FONT SIZE="-1"><B>s</B>quare, </FONT><FONT SIZE="-1"><I>size</I> is its side </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-St</B></FONT><FONT SIZE="-1"><I>size</I> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> </FONT><FONT SIZE="-1"><B>t</B>riangle; </FONT><FONT SIZE="-1"><I>size</I> is its side </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-Sv</B>[</FONT><FONT SIZE="-1"><I>thick</I>/</FONT><FONT SIZE="-1"><I>length</I>/</FONT><FONT SIZE="-1"><I>width</I>][</FONT><FONT SIZE="-1"><B>n</B></FONT><FONT SIZE="-1"><I>norm</I>] </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> </FONT><FONT SIZE="-1"><B>v</B>ector; </FONT><FONT SIZE="-1"><I>direction</I> (CCW from horizontal) and </FONT><FONT SIZE="-1"><I>length</I> are read from input data </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> Optionally, append the thickness of the vector and the width and length of the </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> arrow-head. If the </FONT><FONT SIZE="-1"><B>n</B></FONT><FONT SIZE="-1"><I>norm</I> is appended, all vectors whose lengths are less than </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> </FONT><FONT SIZE="-1"><I>norm</I> will have their attributes scaled by length/</FONT><FONT SIZE="-1"><I>norm</I> </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-SV</B>[</FONT><FONT SIZE="-1"><I>thick</I>/</FONT><FONT SIZE="-1"><I>length</I>/</FONT><FONT SIZE="-1"><I>width</I>][</FONT><FONT SIZE="-1"><B>n</B></FONT><FONT SIZE="-1"><I>norm</I>] </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> </FONT><FONT SIZE="-1"><B>v</B>ector, except </FONT><FONT SIZE="-1"><I>azimuth</I> (degrees east of north) is expected instead of </FONT><FONT SIZE="-1"><I>direction</I> </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> The angle on the map is calculated based on the chosen map projection </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-Sw</B>[</FONT><FONT SIZE="-1"><I>size</I> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> pie </FONT><FONT SIZE="-1"><B>s</B>edge; </FONT><FONT SIZE="-1"><I>start</I> and </FONT><FONT SIZE="-1"><I>stop</I> directions (CCW from horizontal) are read from input data </FONT></TD>
</TR>
<TR><TD ALIGN="LEFT"><FONT SIZE="-1">
</FONT><FONT SIZE="-1"><B>-Sx</B></FONT><FONT SIZE="-1"><I>size</I> </FONT></TD>
<TD ALIGN="LEFT"><FONT SIZE="-1"> cross; </FONT><FONT SIZE="-1"><I>size</I> is length of crossing lines </FONT></TD>
</TR>
</TABLE><FONT SIZE="-1">
<A NAME="tbl:psxysymbols"></A></FONT></DIV></TD></TR>
</TABLE>
</DIV><P></P>
<BR>
<P>
Because some symbols require more input data than others, and because the
size of symbols as well as their color can be determined from the input data,
the format of data can be confusing. The general format for the input data
is (optional items are in brackets []):
<BR><A NAME="1727"></A>
<P>
<IMG
WIDTH="22" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img39.gif"
ALT="$x\mbox{ } y$"> [ <IMG
WIDTH="10" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img38.gif"
ALT="$z$"> ] [ <IMG
WIDTH="28" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img40.gif"
ALT="$size$"> ] [ <IMG
WIDTH="20" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img41.gif"
ALT="$\sigma_x$"> ] [ <IMG
WIDTH="20" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img42.gif"
ALT="$\sigma_y$"> ] [ <IMG
WIDTH="50" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img43.gif"
ALT="$symbol$"> ]
<BR>
<P>
The only required input columns are the first two which must contain the
longitude and latitude (or <I>x</I> and <I>y</I>). The remaining items
apply when one (or more) of the following conditions are met:
<P>
<OL>
<LI>If you want the color of each symbol to be determined individually,
supply a cptfile with the <B>-C</B> option and let the 3rd data column
contain the <I>z</I>-values to be used with the cptfile.
<P>
</LI>
<LI>If you want the size of each symbol to be determined individually,
append the size in a separate column.
<P>
</LI>
<LI>To draw error bars, use the <B>-E</B> option and give one or two
additional data columns with the <IMG
WIDTH="32" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img44.gif"
ALT="$\pm dx$"> and <IMG
WIDTH="32" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img45.gif"
ALT="$\pm dy$"> values; the form of
<B>-E</B> determines if one (<B>-Ex</B> or <B>-Ey</B>) or two (<B>-Exy</B>)
columns are needed. If upper case flags <B>X</B> or <B>Y</B> are given then
we will instead draw a ``box-and-whisker'' symbol and the <IMG
WIDTH="20" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img41.gif"
ALT="$\sigma_x$"> (or
<IMG
WIDTH="20" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img42.gif"
ALT="$\sigma_y$">) must represent 4 columns containing the minimum, the 25 and 75%
quartiles, and the maximum value. The given coordinate is taken as the 50%
quartile (median).
<A NAME="903"></A>
<P>
</LI>
<LI>If you draw vectors with <B>-Sv</B> (or <B>-SV</B>) then <I>size</I> is
actually two columns containing the <I>direction</I> (or <I>azimuth</I>)
and <I>length</I> of each vector.
<A NAME="910"></A>
<P>
</LI>
<LI>If you draw ellipses (<B>-Se</B>) then <I>size</I> is actually three
columns containing the <I>direction</I> and the <I>major</I> and <I>minor</I>
axes in inches (with <B>-SE</B> we expect <I>azimuth</I> instead and axes
in km).
<A NAME="918"></A>
<P>
</LI>
</OL>
<P>
Before we try some examples we need to discuss two key switches; they
specify pen attributes and symbol or polygon fill.
<P>
<BR><HR>
<!--Table of Child-Links-->
<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
<UL>
<LI><A NAME="tex2html1126"
HREF="node51.html">2.1.1 Specifying pen attributes</A>
<LI><A NAME="tex2html1127"
HREF="node52.html">2.1.2 Specifying fill attributes</A>
<LI><A NAME="tex2html1128"
HREF="node53.html">2.1.3 Examples</A>
<LI><A NAME="tex2html1129"
HREF="node54.html">2.1.4 Exercises</A>
<LI><A NAME="tex2html1130"
HREF="node55.html">2.1.5 More exercises</A>
</UL>
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<ADDRESS>
Paul Wessel
2001-04-18
</ADDRESS>
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