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<H1><A NAME="SECTION001440000000000000000"></A>
<A NAME="10399"></A>
<BR>
6.4 A 3-D perspective mesh plot
</H1>
<P>
This example will illustrate how to make a fairly complicated
composite figure. We need a subset of the ETOPO5 bathymetry<A NAME="tex2html382"
HREF="footnode.html#foot10400"><SUP>6.1</SUP></A>and Geosat geoid data sets which we will extract from the local
data bases using <A NAME="tex2html384"
HREF="../grdraster.html"><I><B>grdraster</B></I></A><A NAME="10409"></A>. We would like to show a
2-layer perspective plot where layer one shows a contour map
of the marine geoid with the location of the Hawaiian islands
superposed, and a second layer showing the 3-D mesh plot of
the topography. We also add an arrow pointing north and some
text. This is how to do it:
<P>
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<P>
<BR CLEAR="ALL">
<HR>
<BR>
<PRE>
echo '-10 255 0 255' >! zero.cpt
echo '0 100 10 100' >> zero.cpt
grdcontour HI_geoid4.grd -Jm0.45i -E60/30 -R195/210/18/25 -C1 -A5 -G4i -K -P -X1.5i -Y1.5i \
-U/-1.25i/-1.25i/"Example 4 in Cookbook" >! example_04.ps
pscoast -Jm -E60/30 -R -B2/2NEsw -G0 -O -K >> example_04.ps
echo '205 26 0 0 1.1' | psxyz -Jm -E60/30 -R -SV0.2i/0.5i/0.4ii -W1p -O -K -N >> example_04.ps
echo '205 29.2 36 -90 1 5 N' | pstext -Jm -E60/30 -R -O -K -N >> example_04.ps
grdview HI_topo4.grd -Jm -Jz0.34i -Czero.cpt -E60/30 -R195/210/18/25/-6/4 -N-6/200/200/200 -Qsm -O -K \
-B2/2/2:"Topo (km)":neswZ -Y2.2i >> example_04.ps
echo '3.25 5.75 60 0.0 33 2 H@#awaiian@# R@#idge' | pstext -R0/10/0/10 -Jx1i -O >> example_04.ps
\rm -f zero.cpt
csh -f job4c.csh
</PRE>
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<BR>
<P>
<BR CLEAR="ALL">
<HR>
<P>
The purpose of the color palette file <U>zero.cpt</U> is to have
the positive topography mesh painted light gray (the remainder
is white). Figure <A HREF="node77.html#fig:GMT_example_04">6.4</A> shows the complete illustration.
<P></P>
<DIV ALIGN="CENTER"><A NAME="fig:GMT_example_04"></A><A NAME="10467"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 6.4:</STRONG>
3-D perspective mesh plot</CAPTION>
<TR><TD><IMG
WIDTH="399" HEIGHT="499" BORDER="0"
SRC="img101.gif"
ALT="\begin{figure}\centering\epsfig{figure=eps/GMT_example_04.eps}\end{figure}"></TD></TR>
</TABLE>
</DIV><P></P>
<P>
A color version of this figure was used in our first article in EOS
Trans. AGU (Oct. 8th, 1991). It was created along similar
lines, but instead of a mesh plot we chose a color-coded surface
with artificial illumination from a light-source due north.
We choose to use the <B>-Qi</B> option in <A NAME="tex2html385"
HREF="../grdview.html"><I><B>grdview</B></I></A><A NAME="10473"></A> to
achieve a high degree of smoothness. Here, we select 100 dpi
since that will be the resolution of our final raster
(The EOS raster was 300 dpi). We used <A NAME="tex2html386"
HREF="../grdgradient.html"><I><B>grdgradient</B></I></A><A NAME="10482"></A> to
provide the intensity files. The following script creates
the color <I>PostScript</I> file. Note that the size of the
resulting output file is directly dependent on the square of
the dpi chosen for the scanline conversion. A higher value
for dpi in <B>-Qi</B> would have resulted in a much larger
output file. The cpt files were taken from Example 2.
<P>
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<PRE>
grdgradient HI_geoid4.grd -A0 -Gg_intens.grd -Nt0.75 -M
grdgradient HI_topo4.grd -A0 -Gt_intens.grd -Nt0.75 -M
grdview HI_geoid4.grd -Ig_intens.grd -JM6.75i -E60/30 -R195/210/18/25 -Cgeoid.cpt -Qi100 -K -X1.5i \
-Y1.25i -P -U/-1.25i/-1i/"Example 4c in Cookbook" >! example_4c.ps
pscoast -JM -E60/30 -R -B2/2NEsw -G0 -O -K >> example_4c.ps
echo '205 26 0 0 1.1' | psxyz -JM -E60/30 -R -SV0.2i/0.5i/0.4ii -W1p -G255/0/0 -O -K -N \
>> example_4c.ps
echo '205 29.2 36 -90 1 5 N' | pstext -JM -E60/30 -R -O -K -N >> example_4c.ps
grdview HI_topo4.grd -It_intens.grd -JM -JZ3.4i -Ctopo.cpt -E60/30 -R195/210/18/25/-6/4 \
-N-6/200/200/200 -Qi100 -O -K -Y2.2i >> example_4c.ps
psbasemap -JM -JZ3.4i -E60/30 -R -Z-6 -O -K -B2/2/2:"Topo (km)":neZ >> example_4c.ps
echo '3.25 5.75 60 0.0 33 2 H@#awaiian@# R@#idge' | pstext -R0/10/0/10 -Jx1i -O >> example_4c.ps
\rm -f *_intens.grd .gmtcommands
</PRE>
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<ADDRESS>
Paul Wessel
2001-04-18
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