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<H1><A NAME="SECTION001470000000000000000"></A>
<A NAME="10719"></A>
<BR>
6.7 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="tex2html399"
HREF="footnode.html#foot10724"><SUP>6.2</SUP></A>. We create the final location map
(Figure <A HREF="node80.html#fig:GMT_example_07">6.7</A>) with the following script:
<P>
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<PRE>
pscoast -R-50/0/-10/20 -JM9i -K -GP300/26 -Dl -W0.25p -B10 -U"Example 7 in Cookbook" >! example_07.ps
psxy -R -JM -O -K -M fz.xy -W0.5pta >> example_07.ps
$AWK '{print $1-360.0, $2, $3*0.01}' quakes.xym | psxy -R -JM -O -K -H1 -Sci -G255 -W0.25p \
>> example_07.ps
psxy -R -JM -O -K -M isochron.xy -W0.75p >> example_07.ps
psxy -R -JM -O -K -M ridge.xy -W1.75p >> example_07.ps
psxy -R -JM -O -K -G255 -W1p -A << END >> example_07.ps
-14.5 15.2
-2 15.2
-2 17.8
-14.5 17.8
END
psxy -R -JM -O -K -G255 -W0.5p -A << END >> example_07.ps
-14.35 15.35
-2.15 15.35
-2.15 17.65
-14.35 17.65
END
echo "-13.5 16.5" | psxy -R -JM -O -K -Sc0.08i -G255 -W0.5p >> example_07.ps
echo "-12.5 16.5 18 0 6 5 ISC Earthquakes" | pstext -R -JM -O -K >> example_07.ps
pstext -R -JM -O -S0.75p -G255 << END >> example_07.ps
-43 -5 30 0 1 6 SOUTH
-43 -8 30 0 1 6 AMERICA
-7 11 30 0 1 6 AFRICA
END
\rm -f .gmtcommands
</PRE>
<P>
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<P>
<BR CLEAR="ALL">
<HR>
<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.
<P></P>
<DIV ALIGN="CENTER"><A NAME="fig:GMT_example_07"></A><A NAME="10778"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 6.7:</STRONG>
A typical location map</CAPTION>
<TR><TD><IMG
WIDTH="573" HEIGHT="347" BORDER="0"
SRC="img106.gif"
ALT="\begin{figure}\centering\epsfig{figure=eps/GMT_example_07.eps}\end{figure}"></TD></TR>
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<ADDRESS>
Paul Wessel
2001-04-18
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