Hi Christopher, And so I shall experiment with the GDAL_CACHEMAX setting. Perhaps I can post back on that before the end of the day here (US West Coast; PST);
Thanks. = David On Tue, Feb 9, 2010 at 2:13 PM, Christopher Schmidt <crschm...@metacarta.com> wrote: > On Tue, Feb 09, 2010 at 01:57:26PM -0800, David Fogel wrote: >> Hi: >> >> In the process of moving data into GeoTIFF, I am re-creating pyramids >> (OVR files). The good news: It takes fewer than ten minutes to create >> an LZW Horizontal Differenced compressed 3.5 GB file on a Windows 7 >> box using GDAL 1.70+ ( via Tamas Szekeres site; 64-bit precompiled ). >> >> The OVR files are problematic. Using gdal_translate, I can resize by >> 50% in less than ten minutes. Using gdaladdo, the first layer ( "2" ) >> takes hours to complete. >> >> This is for SRTM 16-bit data. It appears that something is amiss. >> >> Tips and tricks? > > One piece of advice; I find that adding overlays is often significantly > helped by increasing the GDAL_CACHEMAX setting. > > gdaladdo --config GDAL_CACHEMAX 800 file.tif 2 4 8 16 32 64 > > 800 is MB of memory; as a result, it probably makes sense to limit this > if your platform is low on free RAM. > > Regards, > -- > Christopher Schmidt > MetaCarta > _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
