Parent Topic: <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/MODEL|Language|Variables">Variables</a><hr>
<H5>Attribute Variables</H5>
Attribute variables are identified by the leading character `%' and
a '.'. Attribute variables take on the value of an attribute
associated with the layer through the grey level value. For example,
%2.3 would be evaluated as follows: at the current pixel location,
the grey level value for the second image channel would be used as a
key to a single line of attribute data associated with the layer;
within this line, the list of attributes would be scanned and the
third attribute value extracted; %2.3 would take on this value. Note
that this value could be numeric or character depending on the
actual nature of the attribute.
<P>
<PRE>
 Syntax:    %x.i, %n.i

 Examples:  %slope.2, %5.3
</PRE>
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Parent Topic: <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/MODEL|Language|Variables">Variables</a><br>
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