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<H1><A NAME="SECTION001570000000000000000"></A>
<A NAME="23798"></A>
<BR>
7.7 A simple location map
</H1>
<P>
Many scientific papers start out by showing a location map
of the region of interest. This map will typically also
contain certain features and labels. This example will
present a location map for the equatorial Atlantic ocean,
where fracture zones and mid-ocean ridge segments have been
plotted. We also would like to plot earthquake locations
and available isochrons. We have obtained one file,
<U>quakes.xym</U>, which contains the position and magnitude of
available earthquakes in the region. We choose to use
magnitude/100 for the symbol-size in inches. The digital
fracture zone traces (<U>fz.xy</U>) and isochrons (0 isochron as
<U>ridge.xy</U>, the rest as <U>isochrons.xy</U>) were digitized from
available maps<A NAME="tex2html1340"
HREF="footnode.html#foot23803"><SUP>7.2</SUP></A>.
We create the final location map
(Figure <A HREF="#fig:GMT_example_07">7.7</A>) with the following script:
<P>
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<PRE>#!/bin/sh
# GMT EXAMPLE 07
#
# Purpose: Make a basemap with earthquakes and isochrons etc
# GMT progs: pscoast, pstext, psxy
# Unix progs: $AWK, echo, rm
#
ps=example_07.ps
pscoast -R-50/0/-10/20 -JM9i -K -GP300/26 -Dl -Wthinnest -B10 -U"Example 7 in Cookbook" > $ps
psxy -R -J -O -K -m fz.xy -Wthinner,- >> $ps
$AWK '{print $1-360.0, $2, $3*0.01}' quakes.xym | psxy -R -J -O -K -H1 -Sci -Gwhite -Wthinnest >> $ps
psxy -R -J -O -K -m isochron.xy -Wthin >> $ps
psxy -R -J -O -K -m ridge.xy -Wthicker >> $ps
psxy -R -J -O -K -Gwhite -Wthick -A >> $ps << END
-14.5 15.2
-2 15.2
-2 17.8
-14.5 17.8
END
psxy -R -J -O -K -Gwhite -Wthinner -A >> $ps << END
-14.35 15.35
-2.15 15.35
-2.15 17.65
-14.35 17.65
END
echo "-13.5 16.5" | psxy -R -J -O -K -Sc0.08i -Gwhite -Wthinner >> $ps
echo "-12.5 16.5 18 0 6 LM ISC Earthquakes" | pstext -R -J -O -K >> $ps
pstext -R -J -O -Sthin -Gwhite >> $ps << END
-43 -5 30 0 1 CM SOUTH
-43 -8 30 0 1 CM AMERICA
-7 11 30 0 1 CM AFRICA
END
rm -f .gmt*
</PRE>
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<DIV ALIGN="CENTER"><A NAME="fig:GMT_example_07"></A><A NAME="24458"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 7.7:</STRONG>
A typical location map.</CAPTION>
<TR><TD>
<DIV ALIGN="CENTER"><IMG
WIDTH="573" HEIGHT="348" ALIGN="BOTTOM" BORDER="0"
SRC="img164.png"
ALT="\includegraphics[scale=0.5]{scripts/example_07}"></DIV></TD></TR>
</TABLE>
</DIV>
<P>
The same figure could equally well be made in color, which
could be rasterized and made into a slide for a meeting
presentation. The script is similar to the one outlined
above, except we would choose a color for land and oceans,
and select colored symbols and pens rather than black and white.
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<A NAME="23808"></A>
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<ADDRESS>
Paul Wessel
2010-01-14
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