[Geotiff] ECW Compression

[Frank Warmerdam]

Mike Edwards wrote:
> I have some Geotiffs which need to be compressed into ECW format.  Does 
> anyone know of a program that will do this while maintaining the geotiff 
> tag?

Mike,

ECW files do not have a mechanism to hold geotiff tags as far as I know.
You can use the gdal_translate utility from the FWTools suite to compress
geotiff to ecw, and a reasonable attempt is made to map to corresponding
geotransform and coordinate system tags in ecw though the process is not
perfect.

   http://fwtools.maptools.org/

eg.
gdal_translate -of ECW in.tif out.ecw

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