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<H2><A NAME="SECTION001412000000000000000">
6.1.2 Equidistant conic projection (<B>-Jd</B> <B>-JD</B>)</A>
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<P>
The equidistant conic projection was described by the Greek
philosopher Claudius Ptolemy about A.D. 150.  It is neither
conformal or equal-area, but serves as a compromise between them.
The scale is true along all meridians and the standard parallels.
To select this projection in <A NAME="tex2html1270"
  HREF="http://gmt.soest.hawaii.edu"><B>GMT</B></A> you must
provide the same information as for the other conic projection, i.e.

<P>

<UL>
<LI>Longitude and latitude of the projection center.
</LI>
<LI>Two standard parallels.
</LI>
<LI>Map scale in inch/degree or 1:xxxxx notation (<B>-Jd</B>), or map width (<B>-JD</B>).
</LI>
</UL>

<P>
The equidistant conic projection is often used for atlases with
maps of small countries.  As an example, we generate a map of
Cuba:

<P>
<BR CLEAR="ALL">
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<PRE>gmtset PLOT_DEGREE_FORMAT ddd:mm:ssF GRID_CROSS_SIZE_PRIMARY 0.05i
pscoast -R-88/-70/18/24 -JD-79/21/19/23/4.5i -B5g1 -Di -N1/thick -Glightgray \
        -Wthinnest -P &gt; GMT_equidistant_conic.ps
</PRE>
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<P>

<DIV ALIGN="CENTER"><A NAME="fig:GMT_equidistant_conic"></A><A NAME="22677"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 6.2:</STRONG>
Equidistant conic map projection</CAPTION>
<TR><TD>
<DIV ALIGN="CENTER"><IMG
 WIDTH="614" HEIGHT="248" ALIGN="BOTTOM" BORDER="0"
 SRC="img123.png"
 ALT="\includegraphics{scripts/GMT_equidistant_conic}"></DIV></TD></TR>
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<ADDRESS>
Paul Wessel
2010-07-14
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