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<H2><A NAME="SECTION00376000000000000000">
1.7.6 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.gif"
ALT="$\vert$">s</B>]<IMG
WIDTH="77" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img23.gif"
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="img35.gif"
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 -G180/120/60 \
-S100/180/255 -W0.25p >! map.ps
</PRE>
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<ADDRESS>
Paul Wessel
2001-04-18
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