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<H2><A NAME="SECTION001346000000000000000">
5.4.6 Cylindrical Equidistant Projection (<B>-Jq</B> <B>-JQ</B>)</A>
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<A NAME="8399"></A>
<A NAME="8400"></A>
<A NAME="8401"></A>
<P>
This simple cylindrical projection is really a linear scaling
of longitudes and latitudes (if you desire a different scaling
for one of the axes you must choose the linear projection <B>-Jx</B>
and append <B>d</B> for degrees; see Section <A HREF="node39.html#sec:linear">5.1.4</A>.)
It is also known as the Plate Carrée projection. All
meridians and parallels are straight lines. The requirements
to define this projection are:
<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 in inch/degree or as 1:xxxxx (<B>-Jq</B>),
or map width (<B>-JQ</B>)
<P>
</DD>
</DL>
<P>
A world map centered on the dateline using this projection
can be obtained by running the command:
<P>
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<PRE>
#!/bin/sh
# $Id: GMT_equi_cyl.sh,v 1.1 2001/03/21 04:10:21 pwessel Exp $
#
pscoast -R0/360/-90/90 -JQ180/4.5i -B60f30g30 -Dc -A5000 -G0 -P > GMT_equi_cyl.ps
</PRE>
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<BR>
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<HR>
<P></P>
<DIV ALIGN="CENTER"><A NAME="fig:GMT_equi_cyl"></A><A NAME="8562"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 5.23:</STRONG>
World map using the equidistant cylindrical projection</CAPTION>
<TR><TD><IMG
WIDTH="608" HEIGHT="318" BORDER="0"
SRC="img85.gif"
ALT="\begin{figure}\centering\epsfig{figure=eps/GMT_equi_cyl.eps}\end{figure}"></TD></TR>
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<ADDRESS>
Paul Wessel
2001-04-18
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