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<H2><A NAME="SECTION002243000000000000000">
An example of a Classification Process</A>
</H2>
We have defined a set of rules for classifying SUSI exposures according to
the exposure type (BIAS, FF, SCI) and a set of rules for classifying them
according to the optical path. (In this case, this consists
simply in classifying the frames according to the filter number that was used.)
<BR>
The MIDAS session shown in Table <A HREF="node380.html#midasproc">15.5</A>
creates these rules and applies them to our set
of SUSI exposures (Table <A HREF="node377.html#fig:susiost">15.3</A>).
The result of the classification process is illustrated in Table <A HREF="node381.html#fig:susiclas">15.6</A>.
<BR>
For convenience, one may also store all the classification parameters in a table (Table <A HREF="node381.html#fig:clastab">15.7</A>) and apply a set of classification rules in one step.
<BR>
Note that instead of the interactive command CREATE/CRULE the equivalent
command WRITE/DESCR may be used.
The table must
contain the following columns:
<UL>
<LI>:DESCR - character column <BR>
Contains the names of the classification rules descriptors
<LI>:OUTCOL - character column <BR>
Contains the label of the output column of the OST in which
the string flagging the exposures satisfying the corresponding rule should be
stored.
<LI>:OUTCHAR - character column <BR>
Contains the character string for flagging the rows satisfying
the corresponding rule.
<BR>
</UL>
<P>
In the session mentioned above, one can replace the four calls to the command
<BR>
CLASSIFY/IMAGE by:<BLOCKQUOTE>
<TT>CLASSIFY/IMAGE susi_ost susi_rule.tbl</TT></BLOCKQUOTE>
<P>
<BR>
<DIV ALIGN="CENTER"><A NAME="fig:susiclas"> </A><A NAME="17539"> </A>
<TABLE>
<CAPTION><STRONG>Table:</STRONG>
Observation Summary Table with file classifications appended in column :EXPTYPE and :OPATH as defined and applied in Table <A HREF="node380.html#midasproc">15.5</A></CAPTION>
<TR><TD><IMG
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ALT="\begin{table}
\centerline{\vbox{\psfig{figure=fig_do_7.ps,bbllx=6.1cm,bblly=10.3cm,bburx=15.3cm,bbury=17.8cm,width=9.4cm,height=7.5cm}}}
\end{table}"></TD></TR>
</TABLE>
</DIV>
<BR>
<P>
<BR>
<DIV ALIGN="CENTER"><A NAME="fig:clastab"> </A><A NAME="17452"> </A>
<TABLE>
<CAPTION><STRONG>Table 15.7:</STRONG>
Classification Table for SUSI exposures (susi_rule.tbl)</CAPTION>
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ALT="\begin{table}
\centerline{\vbox{\psfig{figure=fig_do_2.ps,bbllx=7.4cm,bblly=12.3cm,bburx=14cm,bbury=15.5cm,width=6.7cm,height=3.1cm}}}
\end{table}"></TD></TR>
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<ADDRESS>
<I>Petra Nass</I>
<BR><I>1999-06-15</I>
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