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<H2><A NAME="SECTION001351000000000000000">
5.5.1 Hammer Projection (<B>-Jh</B> <B>-JH</B>)</A>
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<P>
<A NAME="8901"></A>
<A NAME="8893"></A>
<A NAME="8902"></A>
<P>
The equal-area Hammer projection, first presented by
Ernst von Hammer in 1892, is also known as Hammer-Aitoff
(the Aitoff projection looks similar, but is not equal-area).
The border is an ellipse, equator and central meridian are
straight lines, while other parallels and meridians are
complex curves. The projection is defined by selecting:
<P>
<DL>
<DD><P>
</DD>
<DT><STRONG><IMG
WIDTH="12" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
SRC="img54.gif"
ALT="$\bullet$"></STRONG></DT>
<DD>The central meridian
<P>
</DD>
<DT><STRONG><IMG
WIDTH="12" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
SRC="img54.gif"
ALT="$\bullet$"></STRONG></DT>
<DD>Scale along equator in inch/degree or
1:xxxxx (<B>-Jh</B>), or map width (<B>-JH</B>)
<P>
</DD>
</DL>
<P>
A view of the Pacific ocean using the Dateline as central
meridian is accomplished thus
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<PRE>
#!/bin/sh
# $Id: GMT_hammer.sh,v 1.1 2001/03/21 04:10:21 pwessel Exp $
#
pscoast -R0/360/-90/90 -JH180/4.5i -Bg30/g15 -Dc -A10000 -G0 -P > GMT_hammer.ps
</PRE>
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<DIV ALIGN="CENTER"><A NAME="fig:GMT_hammer"></A><A NAME="8987"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 5.26:</STRONG>
World map using the Hammer projection</CAPTION>
<TR><TD><IMG
WIDTH="520" HEIGHT="261" BORDER="0"
SRC="img88.gif"
ALT="\begin{figure}\centering\epsfig{figure=eps/GMT_hammer.eps}\end{figure}"></TD></TR>
</TABLE>
</DIV><P></P>
<P>
<A NAME="8980"></A>
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<A NAME="8981"></A>
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<ADDRESS>
Paul Wessel
2001-04-18
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