[gdal-dev] slow raster (large GDALRasterAttributeTable?)

Frank Warmerdam warmerdam at pobox.com
Mon Aug 24 14:05:30 EDT 2009

bartvde at osgis.nl wrote:
> Hi list,
> I've got a tiff file of 28 Mb and it is really slow, so I am assuming the
> classification gets applied on the fly or something like that.
> If I do a gdalinfo I get a huge list of STATISTICS_HISTOBINVALUES
>   Metadata:
>     STATISTICS_MEAN=-1010.4585191036
>     STATISTICS_STDDEV=1833.0113850333
>     LAYER_TYPE=athematic
>     STATISTICS_HISTOBINVALUES=1|1|1|1|1|1|1|1|1|1|1|2|1|2|1|1|1|2|1|1|1|1.......
> Also, the GDALRasterAttributeTable has 9150 rows. Don't know if this is
> related.
> Any ideas on how to speed this up? I tried to write it out to a new
> GeoTiff or MrSID file, but somehow all this info is preserved, and the
> slowness continues.


Could you provide the dataset?  I'd be interested in reviewing the
performance of the raster attribute table logic with an eye towards
optimizing it.

Best regards,
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent

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