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<H2><A NAME="SECTION00375000000000000000">
1.7.5 Orthographic projection</A>
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<A NAME="1711"></A>
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<P>
The azimuthal orthographic projection (<B>-JG</B>) is one of several
projections with similar syntax and behavior; the one we have
chosen mimics viewing the Earth from space at an infinite distance.
The syntax for this projection is
<BR>
<P>
<B>-JG</B><!-- MATH
$lon_0/lat_0/width$
-->
<IMG
WIDTH="109" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img20.gif"
ALT="$lon_0/lat_0/width$">
<BR>
<P>
where (<IMG
WIDTH="62" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img33.gif"
ALT="$lon_0, lat_0$">) is the center of the map (projection).
As an example we will try
<P>
<PRE>
pscoast -R0/360/-90/90 -JG280/30/6i -Bg30/g15 -Dc -A5000 -G255/255/255 \
-S150/50/150 -P >! map.ps
</PRE>
<P>
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<ADDRESS>
Paul Wessel
2001-04-18
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