[Qgis-user] QGIS project with no projection

[Andrew Harfoot]

Hi Simon,

Sorry for the confusion - GeoTiff is a standard for embedding the 
georeferencing information within the tif image file. A GeoTiff will 
usually contain the CRS information as well. A tfw file is an example of 
a world file, not a GeoTiff. It is an alternative approach to conveying 
georeferencing information, with the drawback of not also documenting 
the CRS of the georeferencing as you say.

Any possibility of sharing the image in question to allow people to 
suggest solutions?

Cheers,

Andy

On 11/05/2016 10:07, simonc8 wrote:
> Thanks for all the responses.
>
> I've tried the various suggestions but can't get my tiff to import properly
> without specifying a projection. Even following the steps suggested in Lee
> Hachadoorian's post the tiff imports and appears to show the correct units
> in the information bar but when I measure distances using the Measure tool
> these are nothing like what they should be.
>
> Incidentally a geotiff doesn't necessarily have any projection information -
> if you have a .tif file and an accompanying .tfw file it will merely
> register the image using the coordinates specified in the .tfw file with no
> information about what these refer to.
>
>
>
> --
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-- 
Andy Harfoot

GeoData Institute
University of Southampton
Southampton
SO17 1BJ

Tel:  +44 (0)23 8059 2719
Fax:  +44 (0)23 8059 2849

www.geodata.soton.ac.uk

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