[gdal-dev] BigTIFF Overviews ( OVR files )

[Even Rouault]

And the exact gdaladdo command line you're using ? (must be sure if it's 
internal or external overviews)

Le Tuesday 09 February 2010 23:22:05 David Fogel, vous avez écrit :
> Hi Even:
>
> The GeoTIFF file is described below (output from gdalinfo).  The
> pre-compiled code is from Tamas' site:
> http://vbkto.dyndns.org/sdk/
> I am using the MSVC2008 version ( scroll to the bottom of the page ).
> This ought to be v1.7.0 with some or all of the code for HFA files
> folded into it.
>
> The workstation is running Windows 7 64-bit w/ 8 GB of RAM and too
> much disk space to know what to do with .. for the moment.
>
> Thanks.
> = David
>
> ----- % cut here % -----
> Driver: GTiff/GeoTIFF
> Files: Central_North.tif
> Size is 119999, 74401
> Coordinate System is:
> GEOGCS["WGS 84",
>     DATUM["WGS_1984",
>         SPHEROID["WGS 84",6378137,298.257223563,
>             AUTHORITY["EPSG","7030"]],
>         AUTHORITY["EPSG","6326"]],
>     PRIMEM["Greenwich",0],
>     UNIT["degree",0.0174532925199433],
>     AUTHORITY["EPSG","4326"]]
> Origin = (-31.999583000000001,60.000416333276846)
> Pixel Size = (0.000833333333333,-0.000833333333333)
> Metadata:
>   AREA_OR_POINT=Area
> Image Structure Metadata:
>   COMPRESSION=LZW
>   INTERLEAVE=BAND
> Corner Coordinates:
> Upper Left  ( -31.9995830,  60.0004163) ( 31d59'58.50"W, 60d 0'1.50"N)
> Lower Left  ( -31.9995830,  -2.0004170) ( 31d59'58.50"W,  2d 0'1.50"S)
> Upper Right (  67.9995837,  60.0004163) ( 67d59'58.50"E, 60d 0'1.50"N)
> Lower Right (  67.9995837,  -2.0004170) ( 67d59'58.50"E,  2d 0'1.50"S)
> Center      (  18.0000003,  28.9999997) ( 18d 0'0.00"E, 29d 0'0.00"N)
> Band 1 Block=119999x1 Type=Int16, ColorInterp=Gray
>   NoData Value=-32768
>   Metadata:
>     LAYER_TYPE=athematic
> ----- % cut here % -----
>
> On Tue, Feb 9, 2010 at 2:09 PM, Even Rouault
>
> <even.rouault at mines-paris.org> wrote:
> > 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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