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<H2><A NAME="SECTION00364000000000000000">
1.6.4 The <B>-J?</B> options</A>
</H2>
<A NAME="1673"></A>
<A NAME="397"></A>
<P>
<P></P>
<DIV ALIGN="CENTER"><A NAME="fig:GMT_-J"></A><A NAME="2226"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 1.9:</STRONG>
The 25 projections available in <A NAME="tex2html110"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A></CAPTION>
<TR><TD><IMG
WIDTH="527" HEIGHT="310" BORDER="0"
SRC="img19.gif"
ALT="\begin{figure}\centering\epsfig{figure=eps/GMT_-J.eps}\end{figure}"></TD></TR>
</TABLE>
</DIV><P></P>
<P>
Selects the map projection. The following code (?) determines the
projection. Specify map <I>width</I> (or axis lengths) in the unit of
your choice. The projections avaiable in <A NAME="tex2html113"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> are presented in Figure <A HREF="node28.html#fig:GMT_-J">1.9</A>.
For this tutorial we will choose one of the following projections
(for details on all <A NAME="tex2html114"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> projections see the <A NAME="tex2html115"
HREF="../psbasemap.html"><I><B>psbasemap</B></I></A><A NAME="2240"></A> man page):
<P>
<DL>
<DT><STRONG>Mercator:</STRONG></DT>
<DD><B>-JM</B><I>width</I>.
<A NAME="1674"></A>
<A NAME="1675"></A>
<P>
</DD>
<DT><STRONG>Orthographic:</STRONG></DT>
<DD><B>-JG</B><!-- MATH
$lon_0/lat_0/width$
-->
<IMG
WIDTH="109" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img20.gif"
ALT="$lon_0/lat_0/width$">. The
<IMG
WIDTH="64" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img21.gif"
ALT="$lon_0/lat_0$"> specifies the projection center.
<A NAME="1676"></A>
<A NAME="1677"></A>
<P>
</DD>
<DT><STRONG>Albers conic:</STRONG></DT>
<DD><B>-JB</B><!-- MATH
$lon_0/lat_0/lat_1/lat_2/width$
-->
<IMG
WIDTH="172" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img22.gif"
ALT="$lon_0/lat_0/lat_1/lat_2/width$">.
Give projection center and two standard parallels.
<A NAME="1678"></A>
<A NAME="1679"></A>
<P>
</DD>
<DT><STRONG>Eckert IV and VI:</STRONG></DT>
<DD><B>-JK</B>[<B>f<IMG
WIDTH="8" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img1.gif"
ALT="$\vert$">s</B>]<IMG
WIDTH="77" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img23.gif"
ALT="$lon_0/width$">. Give the central meridian.
<A NAME="1680"></A>
<A NAME="1681"></A>
<P>
</DD>
<DT><STRONG>Linear:</STRONG></DT>
<DD><B>-JX</B><IMG
WIDTH="89" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img24.gif"
ALT="$width/height$">. Give width [and height]
of plot. <I>width</I> [and/or <I>height</I>] can be given in any of the
following 3 formats:
<A NAME="1682"></A>
<A NAME="1683"></A>
<P>
<OL>
<LI><B>-JX</B><I>width</I>[<B>d</B>]--Regular linear scaling. Append
'<B>d</B>' if <I>x</I> and <I>y</I> are geographical coordinates in degrees;
this allows for 360<IMG
WIDTH="11" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
SRC="img25.gif"
ALT="$^{o}$"> periodicity and degree-symbols in annotations.
<P>
</LI>
<LI><B>-JX</B><I>width</I><B>l</B>--Take log<IMG
WIDTH="17" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img3.gif"
ALT="$_{10}$"> of values before scaling.
<P>
</LI>
<LI><B>-JX</B><I>width</I><B>p</B><I>power</I>--Raise values to <I>power</I>
before scaling.
</LI>
</OL>
<P>
</DD>
</DL>
<P>
Use negative <I>width </I>[<I>and height</I>] to reverse the direction of
an axis (e.g., to have <I>y</I> be positive down).
<P>
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<ADDRESS>
Paul Wessel
2001-04-18
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