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	 Fri, 22 Mar 2002 10:27:39 -0700
From: "Roger Bedell" <roger@sylvanmaps.com>
To: <lmoore@usgs.gov>, <tiff@olympiakos.com>
Subject: RE: TIFF image tiles from the UK Ordnance Survey Errors out.
Date: Fri, 22 Mar 2002 10:18:19 -0700
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Larry,

The person I received this from is quite legit I believe, he works for
CERC (Cambridge Environmental Research Consultants Ltd). He has lodged a
complaint with the UK Ordnance Survey, but he is dubious about whether
it will be taken care of promptly. Therefore a workaround would be nice.
I'll try the various suggestions put forth in this list.

Thanks for your help!

Roger Bedell, President, Sylvan Ascent Inc.
roger@sylvanmaps.com
www.sylvanmaps.com
www.topodepot.com
505-758-7712


-----Original Message-----
From: Laurence R Moore [mailto:lmoore@usgs.gov] 
Sent: Friday, March 22, 2002 9:46 AM
To: roger@sylvanmaps.com
Subject: re: TIFF image tiles from the UK Ordnance Survey Errors out.

We have quite a bit of experience with scanned maps in TIFF format at
the
USGS.  I looked at the IFD of your file using od (Unix hex dump
utility),
and it looks like the error messages you are getting are correct
diagnostics of an illegal dataset.  The RowsPerStrip tag really does
have a
count of zero, and the DateTime tag has a count of 21.  Both are clearly
violations of the TIFF standard (page 31, DateTime N=20, page 39,
RowsPerStrip N=1)).

I think it unlikely that the file was accidentally corrupted; the
overall
structure of the IFD is coherent and the content looks mostly legal.  My
recommendation is to contact the data producer.  Before doing that, I
suggest you confirm with your customer that the Ordinance Survey is the
real source of the data; we have a lot of trouble with complaints from
people who believe they have USGS data when in fact they have a picture
of
a USGS map that was scanned by someone else.  On the other hand, we also
produce bad data now and then, and we like to know about it when someone
discovers the error.

----------
Larry Moore
U.S. Geological Survey
Mid-Continent Mapping Center
lmoore@usgs.gov

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