Parent Topic: <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/SST|PARAMETERS">PARAMETERS</a><hr>
<H4>AVHRRSEG</H4>
Specifies the text segment number containing the AVHRR
calibration/orbital data. This text segment is automatically created
when FIMPORT or MIAVHRR is used to read in an AVHRR image (from disk
or tape, respectively). If AVHRRSEG is not set, SST will try to find
a valid AVHRR text segment in the input file to use.
<P>
<PRE>
 EASI&gt;AVHRRSEG=j     | Use segment number j
 EASI&gt;AVHRRSEG=      | SST will try to find a valid text segment
</PRE>
This text segment (type 140) contains image specific information:
<P>
<UL>
<LI> Satellite Name, Year, Julian Day; 
<LI> Orbital Information (ASCEND/DESCEND); 
<LI> Platinum resistance temperature counts; 
<LI> Internal target count values for channels 3,4,5; 
<LI> Space count values for channels 3,4,5; 
<LI> Up to 5 LUTs used to compress 10-bit data to 8-bit data. Each LUT
corresponds to one AVHRR channel. 
</UL>
It is possible to change the values in this segment using the
program TEXWRIT, a system text editor, and TEXREAD. Be sure to
maintain exactly the same format as the original segment.<p>
For a detailed description of the AVHRRSEG text segment format,
please see the help for AVHRRAD.
<P>
<hr>
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