[gdal-dev] GDALWarpOperation.ChunkAndWarpImage slow on large tiffs
radim.blazek at gmail.com
Wed Mar 9 17:00:39 EST 2011
yes that is the mail reporting the error.
Thank you for explanation. I see that I have to reintroduce all the
staff for GDALRasterIO()
On Wed, Mar 9, 2011 at 8:50 PM, Even Rouault
<even.rouault at mines-paris.org> wrote:
> Le mercredi 09 mars 2011 19:46:26, Radim Blazek a écrit :
> Skimming qgis mailing list, I read this http://lists.osgeo.org/pipermail/qgis-
> Was it the report you were refering too ? If yes, then the report gives an
> interesting hint. You must be aware that the warping code does not take
> advantage of overviews (it is intended to operate on the full-resolution
> raster, and not for downsampling as Frank underlined), so you will have really
> bad performance comparing too GDALRasterIO() if the output dimensions are much
> smaller than the input window size.
>> GDALWarpOperation.ChunkAndWarpImage was reported to be extremly slow
>> on larger geotiff (over 1GB). Is it possible that it is much slower
>> with respect to GDALRasterIO() even without reprojection? Should I
>> return to 'manualy' reading data via GDALRasterIO() + fidling with
>> data extents and cells alignement? I thought that GDAL
>> ChunkAndWarpImage will do it even faster, possibly knowing better (?)
>> various formats nature.
>> Is there way to tune somehow performance? Currently no reprojection
>> and GRA_NearestNeighbour.
>> Still the same code which I posted before
>> Thanks for help.
>> gdal-dev mailing list
>> gdal-dev at lists.osgeo.org
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