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<H3><A NAME="SECTION001922200000000000000"></A>
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B.2.2.2 Pixel registration
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<P>
Here, the nodes are centered in the grid cells, i.e., the areas
between grid lines, and the data points represent the average
values within each cell (Figure&nbsp;<A HREF="#fig:GMT_App_B_2">B.2</A>.
In the case of pixel registration the number of nodes are related
to region and grid spacing by 
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<!-- MATH
 \begin{displaymath}
\begin{array}{ccl} 
nx & =  &       (x_{max} - x_{min}) / x_{inc}   \\
ny & =  &       (y_{max} - y_{min}) / y_{inc}
\end{array}
\end{displaymath}
 -->

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 WIDTH="171" HEIGHT="45" BORDER="0"
 SRC="img223.png"
 ALT="\begin{displaymath}\begin{array}{ccl}
nx &amp; = &amp; (x_{max} - x_{min}) / x_{inc} \\
ny &amp; = &amp; (y_{max} - y_{min}) / y_{inc}
\end{array} \end{displaymath}">
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Thus, given the same region (<B>-R</B>), the pixel node registered grids have one less
column and one less row than the grid line registered grids; here we
find <IMG
 WIDTH="81" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
 SRC="img224.png"
 ALT="$nx = ny = 3$">.

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<DIV ALIGN="CENTER"><A NAME="fig:GMT_App_B_2"></A><A NAME="29682"></A>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure B.2:</STRONG>
Pixel registration of data nodes.</CAPTION>
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<ADDRESS>
Paul Wessel
2010-07-14
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