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	 Fri, 22 Mar 2002 07:37:31 -0700
From: "Roger Bedell" <roger@sylvanmaps.com>
To: <tiff@olympiakos.com>
Subject: TIFF image tiles from the UK Ordnance Survey Errors out.
Date: Fri, 22 Mar 2002 07:28:12 -0700
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Please forgive me if this is a duplicate post, I had a little trouble
subscribing to the TIFF list (my fault).
 
I am trying to load a TIFF image tiles from the UK
Ordnance Survey. It errors out with a variety of warnings, the most
critical of which seems to be:
 
Incorrect count for field "RowsPerStrip" (0, expecting 1); tag ignored
 
And 
 
Incorrect count for field "StripOffsets"(2000, expecting 1); tag ignored
 
After this it crashes hard.
 
Can anyone help me? I am using v3.5.7 of libtiff. I've never had a
problem before.
 
You can download the test file I've been using from:
 
http://sylvanmaps.com/temp/Tq06.zip
 
Here is some more information from my customer who is trying to use
these files:
 
It's a standard Ordnance Survey 20km x 20km image tile. I tried another
one and that didn't work either. The Ordnance Survey is the UK
government national mapping agency.
 
"1:50,000 Scale Colour Raster data is the definitive raster dataset
providing national coverage of Great Britain. It is comprised of 812
20km by 20km tiles, offering seamless coverage of the entire country.
 
The 1:50,000 Scale Colour Raster data product mirrors the popular
LandrangerR map series, Britain's most popular map series. It can
provide the ideal mapping backdrop upon which to overlay business
information."
 
According to their technical spec the file I sent you was "TIFFT Palette
8 bit (256 colours) uncompressed". They charge a fee for these files, so
I don't think there's anywhere the libtiff developers can get them from.

 
Got all this from http://www.ordsvy.gov.uk/ choosing 1:50,000 scale
raster image from the dropdown. There is a sample you can download from
their website ("sample data" link). I just tried to download it but it
didn't succeed
 
Thanks for looking into it, I suppose now we wait to see whether anyone
responds on the libtiff list,
 
 
Thanks!!
 
 
Roger Bedell
roger@sylvanmaps.com
 

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<body lang=3DEN-US link=3Dblue vlink=3Dpurple =
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<div class=3DSection1>

<p class=3DMsoPlainText><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Please forgive me if this is a duplicate post, I had =
a
little trouble subscribing to the TIFF list (my =
fault).<o:p></o:p></span></font></p>

<p class=3DMsoPlainText><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoPlainText><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>I am trying to load a </span></font>TIFF image tiles =
from
the =
<st1:country-region><st1:place>UK</st1:place></st1:country-region><o:p></=
o:p></p>

<p class=3DMsoNormal><span class=3DGramE><font size=3D3 face=3D"Times =
New Roman"><span
style=3D'font-size:12.0pt'>Ordnance Survey.</span></font></span> It =
errors out
with a variety of warnings, the most critical of which seems to =
be:<o:p></o:p></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>Incorrect count for field &#8220;<span =
class=3DSpellE>RowsPerStrip</span>&#8221;
(0, expecting 1); tag ignored<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>And <o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>Incorrect count for field &#8220;<span =
class=3DSpellE>StripOffsets</span><span
class=3DGramE>&#8221;(</span>2000, expecting 1); tag =
ignored<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>After this it crashes hard.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>Can anyone help me? I am using v3.5.7 of <span =
class=3DSpellE>libtiff</span>.
I&#8217;ve never had a problem =
before&#8230;<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>You can download the test file I&#8217;ve been using =
from:<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><a =
href=3D"http://sylvanmaps.com/temp/Tq06.zip">http://sylvanmaps.com/temp/T=
q06.zip</a><o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>Here is some more information from my customer who is trying to =
use
these files:<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal =
style=3D'mso-layout-grid-align:none;text-autospace:none'><font
size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier New"'>It's
a standard Ordnance Survey 20km x 20km image tile. I tried another one =
and that
didn't work either. The Ordnance Survey is the =
</span></font><st1:country-region><st1:place><font
  size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New"'>UK</span></font></st1:place></st1:country-region><font
size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier New"'>
government national mapping agency.<o:p></o:p></span></font></p>

<p class=3DMsoNormal =
style=3D'mso-layout-grid-align:none;text-autospace:none'><font
size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal =
style=3D'mso-layout-grid-align:none;text-autospace:none'><font
size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier New"'>&quot;1:50,000
Scale <span class=3DSpellE>Colour</span> Raster data is the definitive =
raster
dataset providing national coverage of =
</span></font><st1:country-region><st1:place><font
  size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier New"'>Great
  Britain</span></font></st1:place></st1:country-region><font size=3D2
face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier New"'>.
It is comprised of 812 20km by 20km tiles, offering seamless coverage of =
the
entire country.<o:p></o:p></span></font></p>

<p class=3DMsoNormal =
style=3D'mso-layout-grid-align:none;text-autospace:none'><font
size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal =
style=3D'mso-layout-grid-align:none;text-autospace:none'><font
size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier New"'>The
1:50,000 Scale <span class=3DSpellE>Colour</span> Raster data product =
mirrors the
popular <span class=3DSpellE>Landranger</span>&reg; map series, =
</span></font><st1:country-region><st1:place><font
  size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New"'>Britain</span></font></st1:place></st1:country-region><font
size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier New"'>'s
most popular map series. It can provide the ideal mapping backdrop upon =
which
to overlay business information.&quot;<o:p></o:p></span></font></p>

<p class=3DMsoNormal =
style=3D'mso-layout-grid-align:none;text-autospace:none'><font
size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal =
style=3D'mso-layout-grid-align:none;text-autospace:none'><font
size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier New"'>According
to their technical spec the file I sent you was &quot;TIFF&#8482; =
Palette 8 bit
(256 <span class=3DSpellE>colours</span>) uncompressed&quot;. They =
charge a fee
for these files, so I don't think there's anywhere the <span =
class=3DSpellE>libtiff</span>
developers can get them from. <o:p></o:p></span></font></p>

<p class=3DMsoNormal =
style=3D'mso-layout-grid-align:none;text-autospace:none'><font
size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal =
style=3D'mso-layout-grid-align:none;text-autospace:none'><span
class=3DGramE><font size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt;
font-family:"Courier New"'>Got all this from <a =
href=3D"http://www.ordsvy.gov.uk/">http://www.ordsvy.gov.uk/</a>
choosing 1:50,000 scale raster image from the =
dropdown.</span></font></span><font
size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier New"'>
There is a sample you can download from their website (&quot;sample =
data&quot;
link). I just tried to download it but it didn't =
succeed<o:p></o:p></span></font></p>

<p class=3DMsoNormal =
style=3D'mso-layout-grid-align:none;text-autospace:none'><font
size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal =
style=3D'mso-layout-grid-align:none;text-autospace:none'><font
size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt;font-family:"Courier New"'>Thanks
for looking into it, I suppose now we wait to see whether anyone =
responds on
the <span class=3DSpellE>libtiff</span> =
list,<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>Thanks!!<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt;mso-no-proof:yes'>Roger Bedell<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt;mso-no-proof:yes'>roger@sylvanmaps.com<o:p></o:p></span></font></p=
>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

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