Parent Topic: <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/RTV">RTV</a><hr>
<H3>EXAMPLE</H3>
Following are the steps used in exporting a coverage to a GIS
system:
<P>
<UL>
<LI> Creation of a coverage on an image channel. Typically the result
of maximum likelihood classification (MLC), modelling (MODEL), or
other processing. 
</UL>
<UL>
<LI> `Cleaning' of the coverage to remove small polygons. This can be
done using mode/median filtering (FMO,FME). 
</UL>
<UL>
<LI> Raster-to-vector conversion of the coverage with both line and
point data generated (RTV). 
</UL>
<UL>
<LI> Warping of the vector data to georeference it (VECREG). This is
necessary only if the georeferencing segment is in line and pixel
coordinate form. 
</UL>
<UL>
<LI> Writing out of the vector data to a form readable by a GIS
(VECWRIT). 
</UL>
The user wishes to export a classification coverage, which is on
channel 7 of the file irvine.pix, to the ARC/INFO GIS system. The
data is `cleaned' by running the coverage through the mode filter
filter twice. The original data on channel 7 will be overwritten.
<P>
<PRE>
 EASI&gt;FILE=&quot;irvine.pix&quot;
 EASI&gt;DBIC = 7
 EASI&gt;DBOC = 8
 EASI&gt;FLSZ = 5,5                | 5x5 filter
 EASI&gt;THINLINE = &quot;OFF&quot;          | do not filter thin lines
 EASI&gt;RUN FMO                   | Mode Filter, first pass

 EASI&gt;DBIC = 8
 EASI&gt;DBOC = 7
 EASI&gt;RUN FMO                   | second pass
</PRE>
The cleaned data on channel 7 will now be vectorized by the RTV
program.
<P>
<PRE>
 EASI&gt;DBIC = 7
 EASI&gt;DBIW =
 EASI&gt;DBSN = &quot;Topology&quot;
 EASI&gt;DBSD = &quot;Lines and Points for cleaned theme data&quot;
 EASI&gt;POLYINFO = &quot;BOTH&quot;         | generate points and lines
 EASI&gt;BORDER   = &quot;ON&quot;           | generate border lines
 EASI&gt;CONTINT =                 | contour interval of 1
 EASI&gt;RUN RTV
</PRE>
The generated vector data is in &quot;UTM 11 S E000&quot; coordinates. Segment
1 of irvine.pix contains the georeferencing information used to
convert the PIXEL coordinates to UTM coordinates.<p>
The program VECWRIT can now be used to output the vector data to the
intermediate ARC/INFO Generate format. The PACE programs IVV and VED
can also be used to show and edit the vector data.
<P>
<PRE>
 EASI&gt;DBVS = LASC               | segment created by VECREG
 EASI&gt;FILV = &quot;topology&quot;
 EASI&gt;VECFORM = &quot;ARC&quot;           | ARC INFO Generate format
 EASI&gt;RUN VECWRIT
</PRE>
<hr>
Parent Topic: <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/RTV">RTV</a><br>
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