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<H2><A NAME="SECTION001354000000000000000">
5.5.4 Robinson Projection (<B>-Jn</B> <B>-JN</B>)</A>
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<A NAME="9207"></A>
<A NAME="9219"></A>
<P>
The Robinson projection, presented by Arthur H. Robinson in
1963, is a modified cylindrical projection that is neither
conformal nor equal-area. Central meridian and all parallels
are straight lines; other meridians are curved. It uses
lookup tables rather than analytic expressions to make the
world map ``look'' right<A NAME="tex2html341"
HREF="footnode.html#foot9220"><SUP>5.2</SUP></A>. The scale is true
along latitudes <IMG
WIDTH="16" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img53.gif"
ALT="$\pm$"> 38<IMG
WIDTH="11" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
SRC="img61.gif"
ALT="$^{o}$">. The projection was originally
developed for use by Rand McNally and is currently used by
the National Geographic Society. To use it you must enter
<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>-Jn</B>), or map width (<B>-JN</B>)
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Again centered on Greenwich, the example below was created by this command:
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<PRE>
#!/bin/sh
# $Id: GMT_robinson.sh,v 1.1 2001/03/21 04:10:21 pwessel Exp $
#
pscoast -R-180/180/-90/90 -JN0/4.5i -Bg30/g15 -Dc -A10000 -G128 -P > GMT_robinson.ps
</PRE>
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<DIV ALIGN="CENTER"><A NAME="fig:GMT_robinson"></A><A NAME="9357"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 5.29:</STRONG>
World map using the Robinson projection</CAPTION>
<TR><TD><IMG
WIDTH="520" HEIGHT="264" BORDER="0"
SRC="img91.gif"
ALT="\begin{figure}\centering\epsfig{figure=eps/GMT_robinson.eps}\end{figure}"></TD></TR>
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<ADDRESS>
Paul Wessel
2001-04-18
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