[gdal-dev] BigTIFF Overviews ( OVR files )

[Even Rouault]

Could you append the output of gdalinfo on the TIF you make overviews on and 
the exact gdaladdo you're using (mainly if you use one particular resampling 
algorithm) ?

Le Tuesday 09 February 2010 22:57:26 David Fogel, vous avez écrit :
> 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?
>
> Thanks!
> = David
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