[gdal-dev] projection in external file

[Frank Warmerdam]

On 11-01-26 08:33 AM, morabit wrote:
>
> Hi All,
>   In our project we have to support the loading of tiff images
> that will be geo-referenced by means of external companion
> files containing the affine geo transformation and projection
> information (WKT).
> We have tested that GDAL supports external geo-transform
> using .tfw files, but we are not able to load WKT info included
> in companion .proj or .wkt files.
> Does GDAL support this kind of feature?
> Perhaps it supports this feature using some other format (aux.xml)?
> In case of positive answer, what is the right way to accomplish this?

Bruno,

Yes, it should be possible to embed a coordinate system in an .aux.xml file
and have GDAL utilize it transparently for GeoTIFF files.  I have attached
an example .aux.xml file with a coordinate system and geotransform in it.
Note that the coordinate system is in WKT, but with XML encoding of special
characters like quotes.

Best regards,
-- 
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent

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