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<H3><A NAME="SECTION001722100000000000000"></A>
<A NAME="13262"></A>
<BR>
B.2.2.1 Grid line registration
</H3>
<P>
In this registration, the nodes are centered on the grid line
intersections and the data points represent the average value
in a cell of dimensions (<!-- MATH
$x_{inc} \cdot y_{inc}$
-->
<IMG
WIDTH="58" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img142.gif"
ALT="$x_{inc} \cdot y_{inc}$">) centered on the
nodes (Figure <A HREF="node116.html#fig:GMT_gridreg">B.1</A>).
In the case of grid line registration the number of nodes are
related to region and grid spacing by
<BR>
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<!-- MATH
\begin{displaymath}
\begin{array}{ccl}
nx & = & (x_{max} - x_{min}) / x_{inc} + 1 \\
ny & = & (y_{max} - y_{min}) / y_{inc} + 1
\end{array}
\end{displaymath}
-->
<IMG
WIDTH="195" HEIGHT="45" BORDER="0"
SRC="img143.gif"
ALT="\begin{displaymath}\begin{array}{ccl}
nx & = & (x_{max} - x_{min}) / x_{inc} + 1 \\
ny & = & (y_{max} - y_{min}) / y_{inc} + 1
\end{array} \end{displaymath}">
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which for the example in Figure <A HREF="node116.html#fig:GMT_gridreg">B.1</A> yields <IMG
WIDTH="81" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img144.gif"
ALT="$nx = ny = 4$">.
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<DIV ALIGN="CENTER"><A NAME="fig:GMT_gridreg"></A><A NAME="13523"></A>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure B.1:</STRONG>
Grid line registration of data nodes</CAPTION>
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SRC="img145.gif"
ALT="\begin{figure}\centering\epsfig{figure=eps/GMT_gridreg.eps}\end{figure}"></TD></TR>
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<P>
<A NAME="13278"></A>
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<BR><HR>
<ADDRESS>
Paul Wessel
2001-04-18
</ADDRESS>
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