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<H1><A NAME="SECTION0014120000000000000000"></A>
<A NAME="11128"></A>
<BR>
6.12 Optimal triangulation of data
</H1>
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Our next example (Figure <A HREF="node85.html#fig:GMT_example_12">6.12</A>)
operates on a data set of topographic
readings non-uniformly distributed in the plane (Table
5.11 in Davis: <I>Statistics and Data Analysis in Geology</I>,
J. Wiley). We use <A NAME="tex2html410"
HREF="../triangulate.html"><I><B>triangulate</B></I></A><A NAME="11141"></A> to perform the optimal
Delaunay triangulation, then use the output to draw the
resulting network. We label the node numbers as well as
the node values, and call <A NAME="tex2html411"
HREF="../pscontour.html"><I><B>pscontour</B></I></A><A NAME="11150"></A> to make a contour
map and image directly from the raw data. Thus, in this
example we do not actually make gridded files but still
are able to contour and image the data. We use a color
palette table <U>topo.cpt</U> (supplied with the script data
separately). The script becomes:
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triangulate table_5.11 -M >! net.xy
psxy -R0/6.5/-0.2/6.5 -JX3.06i/3.15i -B2f1WSNe -M net.xy -W0.5p -P -K -Y4.65i >! example_12.ps
psxy table_5.11 -R -JX -O -K -Sc0.12i -G255 -W0.25p >> example_12.ps
$AWK '{print $1, $2, 6, 0, 0, 6, NR-1}' table_5.11 | \
pstext -R -JX -O -K >> example_12.ps
psxy -R -JX -B2f1eSNw -M net.xy -W0.5p -O -K -X3.25i >> example_12.ps
psxy -R -JX -O -K table_5.11 -Sc0.03i -G0 >> example_12.ps
$AWK '{printf "%g %s 6 0 0 5 %g\n", $1, $2, $3}' table_5.11 | pstext -R -JX -O -K -W255o \
-C0.01i/0.01i -D0.08i/0i -N >> example_12.ps
set z = `minmax table_5.11 -C -I25`
makecpt -Cjet -T$z[5]/$z[6]/25 >! topo.cpt
pscontour -R -JX table_5.11 -B2f1WSne -W0.75p -Ctopo.cpt -L0.25pta -G1i -X-3.25i -Y-3.65i -O -K \
-U"Example 12 in Cookbook" >> example_12.ps
pscontour -R -JX table_5.11 -B2f1eSnw -Ctopo.cpt -I -X3.25i -O -K >> example_12.ps
echo "3.16 8 30 0 1 2 Delaunay Triangulation" | pstext -R0/8/0/11 -Jx1i -O -X-3.25i >> example_12.ps
\rm net.xy topo.cpt .gmtcommands
</PRE>
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<DIV ALIGN="CENTER"><A NAME="fig:GMT_example_12"></A><A NAME="11208"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 6.12:</STRONG>
Optimal triangulation of data</CAPTION>
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WIDTH="386" HEIGHT="494" BORDER="0"
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ALT="\begin{figure}\centering\epsfig{figure=eps/GMT_example_12.eps}\end{figure}"></TD></TR>
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<ADDRESS>
Paul Wessel
2001-04-18
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