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<H2><A NAME="SECTION003243000000000000000">
O.4.3 Using a different data set for labels</A>
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<P>
In the next example we will use the bathymetry values along the transect as
our label, with placement determined by the distance along track. We choose
to place labels every 1500 km. To do this we need to pull out those records
whose distances are multiples of 1500 km and create a ``fixed points'' file
that can be used to place labels and specify the labels. This is done with
<I>awk</I><A NAME="32976"></A>.
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<PRE>awk '{if (NR > 1 && ($3 % 1500) == 0) print $1, $2, int($5)}' transect.d > fix2.d
pscoast -R50/160/-15/15 -JM5.3i -Glightgray -A500 -K -P > GMT_App_O_8.ps
grdcontour geoid.grd -J -O -K -B20f10WSne -C10 -A20+d+um+s8 -Gl50/10S/160/10S -S10 \
-T:-+ >> GMT_App_O_8.ps
psxy -R -J -O -Sqffix2.d:+g+an+p+Lf+um+s8 -Wthick transect.d >> GMT_App_O_8.ps
</PRE>
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The output is presented as Figure <A HREF="#fig:GMT_App_O_8">O.8</A>.
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<DIV ALIGN="CENTER"><A NAME="fig:GMT_App_O_8"></A><A NAME="32981"></A>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure O.8:</STRONG>
Labels based on another data set (here bathymetry) while
the placement is based on distances.</CAPTION>
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<ADDRESS>
Paul Wessel
2010-01-14
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