Parent Topic: <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/CLWORKS|Accuracy+Assessment">Accuracy Assessment</a><hr>
<H4>Load Reference Image</H4>
Note:  Loading a reference image is optional, since Accuracy Assessment can
be performed using a hardcopy map instead of database reference image.
However, it is highly recommended that at least the original input image for
classification be used as a reference image because this makes the task of
identifying classes for each random point much easier.<p>
The ``Load Reference Image Overview'' panel contains two scrollable lists. 
The Database
Channels list selects one or three 8-bit image channels to use as a
reference image. For example, a high-resolution reference image from
another database file could be selected using the New File button. 
The Database PCT Segments list (optional) selects a pseudo-colour table (PCT)
segment for use with a one-channel reference image.<p>
The five action buttons along the bottom do the following:
<P>
<UL>
<LI> Load&amp;Close: This button loads an overview of the reference image and (if
selected) the pseudo-colour table to the ImageWorks main display
window, then closes the panel. The Full Res Reference window opens.
<LI> Load: This button loads an overview of the reference image and (if 
selected)
the pseudo-colour table to the ImageWorks main display window without
closing the panel. The Full Res Reference window opens.
<LI> Close: This button closes the panel without loading image or PCT data. 
<LI> New File: This button opens a Database File Selection panel allowing a
different file for the reference image to be selected. The reference image
and classified image database file must be both georeferenced with the
same units. The resolution (pixel size) of the reference image and the 
classified image do NOT have to be the same. 
<LI> Help: This button displays this help information. 
</UL>
There are three possible modes for loading data:
<P>
<UL>
<LI> If three image channels are selected, the display is put in RGB mode
(PCT is ignored).
<LI> If one image channel and no PCT segment are selected, the display is put
in BW mode. 
<LI> If one image channel and one PCT segment are selected, the display is
put in PC mode. 
</UL>
<hr>
Parent Topic: <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/CLWORKS|Accuracy+Assessment">Accuracy Assessment</a><br>
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