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<H2><A NAME="SECTION00346000000000000000">
1.4.6 Eckert IV and VI projection</A>
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We conclude the survey of map projections with the Eckert IV and VI projections
(<B>-JK</B>), two of several projections used for global thematic maps; They
are both equal-area projections whose syntax is 
<BR>
<P>
<B>-JK</B>[<B>f<IMG
 WIDTH="8" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
 SRC="img1.png"
 ALT="$\vert$">s</B>]<IMG
 WIDTH="77" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
 SRC="img13.png"
 ALT="$lon_0/width$"> 
<BR>
<P>
where <B>f</B> gives Eckert IV (4) and <B>s</B> (Default) gives Eckert VI (6).
The <IMG
 WIDTH="32" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
 SRC="img14.png"
 ALT="$lon_0$"> is the central meridian (which takes precedence over
the mid-value implied by the <B>-R</B> setting).  A simple Eckert VI world map
is thus generated by

<P>
<PRE>
pscoast -R0/360/-90/90 -JKs180/9i -B60g30/30g15 -Dc -A5000 \
    -Gchocolate -SDarkTurquoise -Wthinnest &gt; map.ps
</PRE>

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<ADDRESS>
Paul Wessel
2010-07-14
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