Le jeudi 14 avril 2011 17:02:36, Eli Adam a écrit : I'm not aware of any recent change in the GTiff driver that could have "solved" the issue you've seen. This is a bit surprising.
Could you also try with the -stable builds (based on 1.8 branch) from http://vbkto.dyndns.org/sdk/ to compare ? > This is an informational report only, there are not problems in trunk. > > Using 1.8.0 from OSGeo4W on XP, I made a mosaic of about 1200 uncompressed > tifs totally 80G. > > gdalbuildvrt mosaic.vrt *.tif > > Then gdal_translated that to a compressed tif of about 8G > > gdal_translate mosaic.vrt mosaic_ycbcr_big.tif -co COMPRESS=JPEG -co > PHOTOMETRIC=YCBCR -co TILED=YES -co BIGTIFF=YES --config GDAL_CACHEMAX 800 > > Last step was to add some overviews: > > gdaladdo --config COMPRESS_OVERVIEW JPEG --config PHOTOMETRIC_OVERVIEW > YCBCR --config INTERLEAVE_OVERVIEW PIXEL --config BIGTIFF_OVERVIEW YES > --config GDAL_CACHEMAX 800 -r average -ro mosaic_ycbcr_big.tif 2 4 8 16 32 > 64 128 > > It works (at least in OpenEV it displays quickly like it is using > overviews), except the file sizes for the overviews seem odd and too > large. > > The tiles are about 80G, the result of gdal_translate is 8G, the result of > gdaladdo, mosaic_ycbcr_big.tif.ovr, is 375G! That was using 1.8.0. > > I tested on trunk on ubuntu and XP from here, http://vbkto.dyndns.org/sdk/ > which produce reasonable results. The ovr is about 3G. > > A dif of gdalinfo on the .tif and .ovr are the same. > > (I hope that is not the result of a typo when I initially typed the > command. I unfortunately don't have the shell around any more but took > the above listed commands from some notes I took.) > > I have tried making the overviews internal and external with similar > results. I also tried making the overviews on the uncompressed files (the > vrt) with the same results. Then I made the overviews 1 level at a time > and those results seemed reasonable. > > I didn't find any tickets about this in trac, but don't experience this in > trunk so apparently it is fixed. Just reporting in case it is useful. > > Do you want any other information? > > Thanks, Eli > > > > > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev