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<H3><A NAME="SECTION001331200000000000000"></A>
<A NAME="6853"></A>
<BR>
5.3.1.2 Hemisphere map
</H3>
<P>
<A NAME="sec:lamb"></A>Here, you must specify the world as your region (<B>-R</B>0/360/-90/90).
E. g., to obtain a hemisphere view that shows the Americas, try
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<PRE>
#!/bin/sh
# $Id: GMT_lambert_az_hemi.sh,v 1.1 2001/03/21 04:10:21 pwessel Exp $
#
pscoast -R0/360/-90/90 -JA280/30/3.5i -B30g30/15g15 -Dc -A1000 -G0 -P > GMT_lambert_az_hemi.ps
</PRE>
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<DIV ALIGN="CENTER"><A NAME="fig:GMT_lambert_az_hemi"></A><A NAME="6945"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 5.10:</STRONG>
Hemisphere map using the Lambert
azimuthal equal-area projection.</CAPTION>
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WIDTH="405" HEIGHT="405" BORDER="0"
SRC="img72.gif"
ALT="\begin{figure}\centering\epsfig{figure=eps/GMT_lambert_az_hemi.eps}\end{figure}"></TD></TR>
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<P>
To geologists, the Lambert azimuthal equal-area projection (with
origin at 0<IMG
WIDTH="11" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
SRC="img61.gif"
ALT="$^{o}$">/0<IMG
WIDTH="11" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
SRC="img61.gif"
ALT="$^{o}$">) is known as the <I>equal-area</I>
(Schmidt) stereonet and used for plotting fold axes, fault planes,
and the like. An <I>equal-angle</I> (Wulff) stereonet can
be obtained by using the stereographic projection (discussed later).
The stereonets produced by these two projections appear below.
<P>
<P></P>
<DIV ALIGN="CENTER"><A NAME="fig:GMT_stereonets"></A><A NAME="6952"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 5.11:</STRONG>
Equal-Area (Schmidt) and Equal-Angle (Wulff) stereo nets</CAPTION>
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WIDTH="520" HEIGHT="225" BORDER="0"
SRC="img73.gif"
ALT="\begin{figure}\centering\epsfig{figure=eps/GMT_stereonets.eps}\end{figure}"></TD></TR>
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<A NAME="6918"></A>
<A NAME="6919"></A>
<P>
<A NAME="6920"></A>
<A NAME="6938"></A>
<A NAME="6939"></A>
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<ADDRESS>
Paul Wessel
2001-04-18
</ADDRESS>
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