Le lundi 17 décembre 2012 20:50:27, Stephen Woodbridge a écrit : > Hi all, > > I have an ECW file, see gdal info below. I need to reproject this into > EPSG:900913 or EPSG:3857 > > Do I need a key to make the output file ECW?
If you use SDK 4.x, yes. With SDK 3.X if the image was < 500 MB, you didn't need a licence. > > The performance vs size when zooming out is impressive with ECW, but it > does not look like I have ability to create ECW. Are there better > formats then GTif in the list below? JPEG2000 or MrSID are somewhat similar to ECW. > > > $ gdalwarp -t_srs EPSG:900913 -of GTiff -co TILED=YES -co COMPRESS=JPEG > Saraji_South.ecw Saraji_South-900913.tif > Creating output file that is 34551P x 32332L. > Processing input file Saraji_South.ecw. > 0...10... I'd recommand also adding -co PHOTOMETRIC=YCBCR that will make the resulting file typically 2 to 3 times smaller (at the expense of some quality loss of course) See "About JPEG compression of RGB images" section of http://gdal.org/frmt_gtiff.html > > This seems to be working, I suspect this will bulk up after I add > overviews. Yes, with overviews you should have good performance. _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev