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<H2><A NAME="SECTION003233000000000000000">
O.3.3 Prescribed label placements</A>
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<P>
Here, we specify four points where we would like contour labels to be placed. Our points
are not exactly on the contour lines so we give a nonzero ``slop'' to be used in the
distance calculations: The point on the contour closest to our fixed points and within
the given maximum distance will host the label.
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<PRE>cat << EOF > fix.d
80 -8.5
55 -7.5
102 0
130 10.5
EOF
pscoast -R50/160/-15/15 -JM5.3i -Glightgray -A500 -K -P > GMT_App_O_3.ps
grdcontour geoid.nc -J -O -B20f10WSne -C10 -A20+d+s8 -Gffix.d/0.1i -S10 -T:LH >> GMT_App_O_3.ps
</PRE>
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<P>
The angle of the label is evaluated from the contour line geometry, and the final result
is shown in Figure <A HREF="#fig:GMT_App_O_3">O.3</A>.
<DIV ALIGN="CENTER"><A NAME="fig:GMT_App_O_3"></A><A NAME="33519"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure:</STRONG>
Four labels are positioned on the points along the contours that
are closest to the locations given in the file <U>fix.d</U> in the <B>-Gf</B> option.</CAPTION>
<TR><TD>
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WIDTH="653" HEIGHT="195" ALIGN="BOTTOM" BORDER="0"
SRC="img299.png"
ALT="\includegraphics{scripts/GMT_App_O_3}"></DIV></TD></TR>
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To aid in understanding the algorithm we chose to specify ``debug'' mode (<B>+d</B>) which placed a
small circle at each of the fixed points.
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<ADDRESS>
Paul Wessel
2010-07-14
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