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<H2><A NAME="SECTION003231000000000000000">
O.3.1 Equidistant labels</A>
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<P>
Our first example uses the default placement algorithm.  Because of the size
of the map we request contour labels every 1.5 inches along the lines:

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<PRE>pscoast -R50/160/-15/15 -JM5.3i -Glightgray -A500 -K -P &gt; GMT_App_O_1.ps
grdcontour geoid.nc -J -O -B20f10WSne -C10 -A20+s8 -Gd1.5i -S10 -T:LH &gt;&gt; GMT_App_O_1.ps
</PRE>
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As seen in Figure&nbsp;<A HREF="#fig:GMT_App_O_1">O.1</A>, the contours are placed rather arbitrary.
The string of contours for <IMG
 WIDTH="32" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
 SRC="img295.png"
 ALT="$-40$"> to <IMG
 WIDTH="20" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
 SRC="img296.png"
 ALT="$60$"> align well but that is a fortuitous 
consequence of reaching the 1.5 inch distance from the start at the bottom of the map.

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<DIV ALIGN="CENTER"><A NAME="fig:GMT_App_O_1"></A><A NAME="33500"></A>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure:</STRONG>
Equidistant contour label placement with <B>-Gd</B>, the only algorithm
available in previous <A NAME="tex2html1940"
  HREF="http://gmt.soest.hawaii.edu"><B>GMT</B></A> versions.</CAPTION>
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<ADDRESS>
Paul Wessel
2010-07-14
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