[gdal-dev] read a catalog is slower then directly the raster?
even.rouault at mines-paris.org
Tue Jan 31 15:25:53 EST 2012
> Hello Even,
> We have tested as you said. Also we added some code to check execution
> time of GDALRasterIO. We used two rasters in QGIS. First
> ftp://ftp.remotesensing.org/pub/geotiff/samples/misc/tjpeg.tif have
> rotation and warpped in QGIS, second - without rotation
> http://gis-lab.info/data/samples/tjpeg-unroated.7z (the same raster with
> removed rotation)
> For first raster there was such situation (just only for one raster block):
> GDALRasterIO time (ms): 18874
> For second raster:
> GDALRasterIO time (ms): 2
> If you need more test, don't hesitate to say.
> My be, it worth thinking to apply my patch.
I don't intend to work directly on that issue, but now you are a GDAL
committer, you can make appropriate use of your rights :-)
I hadn't reviewed in deep details your patch, but as I remember it was a non
trivial one, I'd encourage you to check that the GDAL python autotest suite
still passes in your local tree. And possibly to extend it to trigger your new
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