Re: [gdal-dev] GDALWarpOperation.ChunkAndWarpImage slow on large tiffs

2011-03-09 Thread Radim Blazek
Hi, yes that is the mail reporting the error. Thank you for explanation. I see that I have to reintroduce all the staff for GDALRasterIO() Radim On Wed, Mar 9, 2011 at 8:50 PM, Even Rouault wrote: > Le mercredi 09 mars 2011 19:46:26, Radim Blazek a écrit : >> Hi, >> > > Skimming qgis mailing li

Re: [gdal-dev] GDALWarpOperation.ChunkAndWarpImage slow on large tiffs

2011-03-09 Thread Even Rouault
Le mercredi 09 mars 2011 19:46:26, Radim Blazek a écrit : > Hi, > Skimming qgis mailing list, I read this http://lists.osgeo.org/pipermail/qgis- developer/2011-March/013291.html Was it the report you were refering too ? If yes, then the report gives an interesting hint. You must be aware that t

Re: [gdal-dev] GDALWarpOperation.ChunkAndWarpImage slow on large tiffs

2011-03-09 Thread Even Rouault
Le mercredi 09 mars 2011 19:46:26, Radim Blazek a écrit : > Hi, > > 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'

Re: [gdal-dev] GDALWarpOperation.ChunkAndWarpImage slow on large tiffs

2011-03-09 Thread Frank Warmerdam
On 11-03-09 01:46 PM, Radim Blazek wrote: Hi, 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 GDALRast

[gdal-dev] GDALWarpOperation.ChunkAndWarpImage slow on large tiffs

2011-03-09 Thread Radim Blazek
Hi, 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