I have found that the existing MrSID gdal driver will ignore j2w files for geotransform information if present with JPEG2000 formatted files.
While symlinking the j2w files to sdw is an option, adding code to look for and use a j2w files is simple and seemingly useful. I added and tested such code to trunk <http://trac.osgeo.org/gdal/browser/trunk>/gdal<http://trac.osgeo.org/gdal/browser/trunk/gdal> /frmts <http://trac.osgeo.org/gdal/browser/trunk/gdal/frmts>/mrsid<http://trac.osgeo.org/gdal/browser/trunk/gdal/frmts/mrsid> /mrsiddataset.cpp<http://trac.osgeo.org/gdal/browser/trunk/gdal/frmts/mrsid/mrsiddataset.cpp> at line 1311 || GDALReadWorldFile( GetDescription(), ".j2w", adfGeoTransform ) and this change appears to do the right thing with j2w files. Please consider integrating this change into the next gdal release. Best, -- John Novak -- John Novak Novacell Technologies and the Old Topo Depot http://www.novacell.com 585-OLD-TOPOS (585-653-8676)
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