Hi, As Frank said in his email, there's work needed in GDAL internals to do what you want properly. But I've just found a workaround that might work if you only plan to use the produced (external) overviews with GDAL. The trick is to generate the overviews by hand with gdalwarp.
Let's say that your input file is 1024x1024 large. Then try : gdalwarp -rcs -ts 512 512 input.tif input.tif.ovr gdalwarp -rcs -ts 256 256 input.tif.ovr input.tif.ovr.ovr gdalwarp -rcs -ts 128 128 input.tif.ovr.ovr input.tif.ovr.ovr.ovr By chance, GDAL can handle overviews of overviews... Best regards, Even _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
