[Geotiff] Combining world files, tab files and tiffs

[Craig Stanton]

Thanks Dave and Hermann,
	I'm not sure of the projection used in the maps I've got. I looked on the website and either missed something obvious or the makers have just assumed everyone knows. I'll look further and try out what you suggested.

Cheers,
	Craig

On 27/08/2010, at 10:34 PM, David Burken wrote:

> Hi Craig,
> 
> On 08/26/2010 07:24 PM, Craig Stanton wrote:
>> Hi All,
>> 	I'm trying to make geotiffs out of the tiffs available from the British Ordanance Survey (https://www.ordnancesurvey.co.uk/opendatadownload/products.html). They come with both .tfw and .tab files and I understand how to use listgeocp to insert the world files into the tif but without projection information they're still next to useless within the app I'm using. I've searched around and found this question was once asked on this very list, but the answer doesn't help me
>> 
>> http://lists.maptools.org/pipermail/geotiff/2007-December/000430.html
>> 
>> I've now got GDAL and don't know what to do with it. I'm on OS X so if there is another (free) tool I can use that would be OK with me, just so long as I end up with a fully valid geotiff.
> I'm sure that gdal can do this, you probably should ping their mailing list.  Do you know the underlying projection for the matching tfw files?  If so, the ossim library has an application "ossim-tfw2ogeom" that takes a template file that has the projection in it and the tfw an makes an ossim geometry file.  Once you have that you would use "ossim-icp" to copy your.tif -> geo.tif.  Not the ideal solution but it works.  The key is you need to know what projection the tfw is relative to and make the template.
> 
> Hope that helps,
> Dave
> 
>> 
>> Cheers,
>> 	Craig
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