[gdal-dev] What is the meaning of the message from gdalinfo

Frank Warmerdam warmerdam at pobox.com
Tue Dec 16 11:47:34 EST 2008

Mo Wang wrote:
> Frank,
> I have built Jasper JPEG2000. And my question was what
> 'J2K_SUBFILE:3935,115450995,caf_08mar12.ntf' is. My input file name was
> caf_08mar12.ntf. It seems wants to tell me something: why J2K_SUBFILE?
> And what are those two numbers (3935 and 115450995) for? Thanks.


The Jasper JPEG2000 driver does not provide support for J2K_SUBFILE
access.  I believe it is provided by the JP2ECW, JP2MRSID and JP2KAK
driver (well I'm positive at least about the JP2KAK driver).

The 3935 is the byte offset to the jpeg2000 data stream within the
caf_08mar12.ntf file.  115450995 is the size of the jpeg2000 data
stream in bytes.

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

More information about the gdal-dev mailing list