Hi Jukka, > > If I run gdalinfo against the JPEG2000 image in > http://kartat.kapsi.fi/files/orto/etrs-tm35fin/mara_v_25000_50/2013/N53/02m > /1/N5144H.jp2 the JP2ECW driver reports the blocksize as (256x256) and > JPEG2000OpenJPEG driver reports that the block size is (1024x1024).
Yes for single tiled images, all JPEG2000 drivers will report a block size of much smaller dimension to avoid GDAL consuming too much memory. > > What interests me would be to know the fact that this image has only one > JPEG2000 tile with a tilesize of (11754x11754). Is there any > driver-independent way for getting this information? You can use the opj_dump utility from openjpeg, or a GDAL Python script https://svn.osgeo.org/gdal/trunk/gdal/swig/python/samples/dump_jp2.py $ python swig/python/samples/dump_jp2.py /vsicurl/http://kartat.kapsi.fi/files/orto/etrs-tm35fin/mara_v_25000_50/2013/N53/02m/1/N5144H.jp2 | grep "siz\"" <Field name="Rsiz" type="uint16" description="Unrestricted profile">0</Field> <Field name="Xsiz" type="uint32">11754</Field> <-- image width <Field name="Ysiz" type="uint32">11754</Field> <-- image height <Field name="XOsiz" type="uint32">0</Field> <Field name="YOsiz" type="uint32">0</Field> <Field name="XTsiz" type="uint32">11754</Field> <-- tile width <Field name="YTsiz" type="uint32">11754</Field> <-- tile height <Field name="Csiz" type="uint16">3</Field> Even -- Spatialys - Geospatial professional services http://www.spatialys.com
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