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<H1><A NAME="SECTION001480000000000000000"></A>
<A NAME="10773"></A>
<BR>
6.8 A 3-D histogram
</H1>
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The program <A NAME="tex2html402"
HREF="../psxyz.html"><I><B>psxyz</B></I></A><A NAME="10783"></A> allows us to plot three-dimensional
symbols, including columnar plots. As a simple demonstration,
we will convert a gridded netCDF of bathymetry into an
ASCII <IMG
WIDTH="25" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img107.gif"
ALT="$xyz$"> table and use the height information to draw a
2-D histogram in a 3-D perspective view. Our gridded
bathymetry file is called <U>topo.grd</U> and covers the region
from 0 to 5 <IMG
WIDTH="11" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
SRC="img61.gif"
ALT="$^{o}$">E and 0 to 5 <IMG
WIDTH="11" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
SRC="img61.gif"
ALT="$^{o}$">N. Depth ranges from
-5000 meter to sea-level. We produce the illustration by
running this command:
<P>
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<PRE>
grd2xyz guinea_bay.grd >! $$
psxyz $$ -B1/1/1000:"Topography (m)"::.ETOPO5:WSneZ+ -R-0.1/5.1/-0.1/5.1/-5000/0 \
-P -JM5i -JZ6i -E200/30 -So0.0833333ub-5000 -U"Example 8 in Cookbook" -W0.25p -G240 -K >! \
example_08.ps
echo '0.1 4.9 24 0 1 9 This is the surface of cube' | pstext -R -JM -JZ -Z0 -E200/30 -O \
>> example_08.ps
\rm -f $$ .gmtcommands
</PRE>
<P>
<BR>
<BR>
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<P>
The output can be viewed in Figure <A HREF="node81.html#fig:GMT_example_08">6.8</A>.
<P></P>
<DIV ALIGN="CENTER"><A NAME="fig:GMT_example_08"></A><A NAME="10850"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 6.8:</STRONG>
A 3-D histogram</CAPTION>
<TR><TD><IMG
WIDTH="404" HEIGHT="540" BORDER="0"
SRC="img108.gif"
ALT="\begin{figure}\centering\epsfig{figure=eps/GMT_example_08.eps}\end{figure}"></TD></TR>
</TABLE>
</DIV><P></P>
<P>
<A NAME="10836"></A>
<P>
<BR><HR>
<ADDRESS>
Paul Wessel
2001-04-18
</ADDRESS>
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