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<H2><A NAME="SECTION001447000000000000000">
6.4.7 Van der Grinten projection (<B>-Jv</B> <B>-JV</B>)</A>
</H2>
<P>
<A NAME="22010"></A>
<A NAME="22011"></A>
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<P>
The Van der Grinten projection, presented by Alphons J. van der Grinten in 1904,
is neither equal-area nor conformal. Central meridian
and Equator are straight lines; other meridians are
arcs of circles. The scale is true along the Equator only.
Its main use is to show the entire world enclosed in a circle.
To use it you must enter
<P>
<UL>
<LI>The central meridian [Middle of your map].
</LI>
<LI>Scale along equator in inch/degree or 1:xxxxx (<B>-Jv</B>), or map width (<B>-JV</B>).
</LI>
</UL>
<P>
Centered on the Dateline, the example below was created by this command:
<P>
<BR CLEAR="ALL">
<HR>
<BR>
<PRE>pscoast -Rg -JV4i -Bg30/g15 -Dc -Glightgray -A10000 -Wthinnest -P > GMT_grinten.ps
</PRE>
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<P>
<DIV ALIGN="CENTER"><A NAME="fig:GMT_grinten"></A><A NAME="22732"></A>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure 6.33:</STRONG>
World map using the Van der Grinten projection.</CAPTION>
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<ADDRESS>
Paul Wessel
2010-01-14
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