[Gdal-dev] Help creating NITF file.

[Frank Warmerdam]

On Wed, 1 Dec 2004 13:15:23 -0500 (EST), Ken Sewell <sewell at dramail.com> wrote:
> 
> I'm trying to write out a NITF file and I need a little help.  This is
> the first time I've tried writing a file with GDAL so I'm in unfamiliar
> territory here.  I can write the file with all of the raster data, but
> I'm getting stuck on the georeferencing.  I know the lat/lon/alt of my
> images corner points but I'm not sure how to write that to the NITF file.
> Any help is appreciated.  Thanks.

Ken,

Are you doing this with calls to the API or just using
gdal_translate?  Usually the easiest way to associate
georeferencing to a raw image is to write a world file for
it.  Many of the drivers, notably including the TIFF driver, 
support world files.  Then you could just gdal_translate to 
NITF, also setting the -a_srs WGS84 switch to let GDAL
know the coordinates are geodetic.  

If you need details on how to prepare a world file let me know.
If you are using the API you should just be able to do 
a SetGeoTransform() call.  The geotransform is essentially
the same values you would put in a world file though in a
different order.

Best regards,
-- 
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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