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<H2><A NAME="SECTION001331000000000000000"></A>
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5.3.1 Lambert Azimuthal Equal-Area (<B>-Ja </B> <B>-JA</B>)
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<P>
This projection was developed by Lambert in 1772 and is
typically used for mapping large regions like continents
and hemispheres. It is an azimuthal, equal-area projection,
but is not perspective. Distortion is zero at the center
of the projection, and increases radially away from this
point. To define this projection in <A NAME="tex2html310"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> you must provide
the following information:
<P>
<DL>
<DT><STRONG><IMG
WIDTH="12" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
SRC="img54.gif"
ALT="$\bullet$"></STRONG></DT>
<DD>Longitude and latitude of the projection center
</DD>
<DT><STRONG><IMG
WIDTH="12" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
SRC="img54.gif"
ALT="$\bullet$"></STRONG></DT>
<DD>Scale as 1:xxxxx or as radius/latitude where radius
is distance on map in inches from projection center to an oblique
latitude (<B>-Ja</B>), or map width in inches (<B>-JA</B>).
</DD>
</DL>
<P>
Two different types of maps can be made with this projection
depending on how the region is specified. We will give
examples of both types.
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<LI><A NAME="tex2html1648"
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<LI><A NAME="tex2html1649"
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<ADDRESS>
Paul Wessel
2001-04-18
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