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Date: Tue, 22 Nov 2005 10:22:00 -0500
From: Alex Brown <albrown@clarku.edu>
Organization: Clark University
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Subject: [Tiff] Geotifcp for  decompression?
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Status:   

Hello - I'm processing a large timeseries collection from
http://glcf.umiacs.umd.edu/data/gimms;  I find the data is in a 16b
integer "compressed greyscale" GeoTIFF format that's not supported by
Idrisi, our preferred toolkit here at Clark U.   I am trying to find a
scriptable solution to decompression, and although it looks like
geotifcp should be able to do it (based on tiffcp(1) support of LZW etc
through -c switch), geotifcp can't read the header, and tiffinfo finds 
unknown tags (below).

As a file integrity check I read it with "irfanview" and saved with no
compression;  the resulting file did import to Idrisi as two 8b band
images, which look like they might be high and low order bytes.  I
really need the 16b data unfortunately, and I would like to find a clean
way to use geotifcp to process hundreds of 40MB files rather than
irfanview's batch feature.  Any suggestions?

Thanks in advance -

-- 
Alex Brown <albrown@clarku.edu>
http://black.clarku.edu/~abrown2
+1 508 421 3712 lab
+1 617 308 9456 mobile


bash-2.05b$ tiffinfo  81aug15a.n07-VIg_data.tif > 
81aug15a.n07-VIg_data_tif_info.txt
TIFFReadDirectory: Warning, 81aug15a.n07-VIg_data.tif: unknown field 
with tag 33550 (0x830e) encountered.
TIFFReadDirectory: Warning, 81aug15a.n07-VIg_data.tif: unknown field 
with tag 33922 (0x8482) encountered.
TIFFReadDirectory: Warning, 81aug15a.n07-VIg_data.tif:  with tag 34735 
(0x87af) encountered.
bash-2.05b$
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