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<H2><A NAME="SECTION001353000000000000000">
5.5.3 Winkel Tripel Projection (<B>-Jr</B> <B>-JR</B>)</A>
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<A NAME="9094"></A>
<A NAME="9106"></A>
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The Winkel Tripel projection, presented by Oswald Winkel in
1921, is a modified azimuthal projection that is neither
conformal nor equal-area. Central meridian and equator are
straight lines; other parallels and meridians are curved.
The projection is obtained by averaging the coordinates of
the Equidistant Cylindrical and Aitoff (not Hammer-Aitoff)
projections. The poles map into straight lines 0.4 times
the length of equator. To use it you must enter
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<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>-Jr</B>), or map width (<B>-JR</B>)
<P>
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Centered on Greenwich, the example in Figure <A HREF="node68.html#fig:GMT_winkel">5.28</A>
was created by this command:
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<PRE>
#!/bin/sh
# $Id: GMT_winkel.sh,v 1.1 2001/03/21 04:10:21 pwessel Exp $
#
pscoast -R-180/180/-90/90 -JR0/4.5i -Bg30/g15 -Dc -A10000 -G128 -P > GMT_winkel.ps
</PRE>
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<DIV ALIGN="CENTER"><A NAME="fig:GMT_winkel"></A><A NAME="9223"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 5.28:</STRONG>
World map using the Winkel Tripel projection</CAPTION>
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WIDTH="520" HEIGHT="318" BORDER="0"
SRC="img90.gif"
ALT="\begin{figure}\centering\epsfig{figure=eps/GMT_winkel.eps}\end{figure}"></TD></TR>
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<ADDRESS>
Paul Wessel
2001-04-18
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