[Qgis-user] Tif too slow to show
Luca Lanteri
mescal72 at gmail.com
Fri Apr 29 06:21:55 PDT 2011
I've had the same problem with my ortophoto. I'm not really sure but I think
the problem is due to the rotation parameter that is not managed at the best
by QGIS. Some months ago I've tried to oped a ticket (
https://trac.osgeo.org/qgis/ticket/3460).
2011/4/29 Kris Nackaerts <knackaerts at gmx.net>
> I see now that your files are CCITTFAX4 compressed.
>
> I had similar B&W rasters, topographic maps from Belgium, same compression.
>
> I uncompressed all, should boost performance. Plus, I added plenty
> overviews.
>
> Kris
>
>
> -------- Original-Nachricht --------
> > Datum: Fri, 29 Apr 2011 14:40:29 +0200
> > Von: Patrice Vetsel <ubuntu at kagou.fr>
> > An: Kris Nackaerts <knackaerts at gmx.net>
> > Betreff: Re: [Qgis-user] Tif too slow to show
>
> > I'v done a
> > gdaladdo -r average 3004221146000AB010200001.tif 2 4 8 16
> >
> > but QGis is always too slow.
> >
> > Thanks
> >
> >
> > Le 29 avr. 2011 à 14:21, Kris Nackaerts a écrit :
> >
> > > Dear,
> > >
> > > I would start trying gdaladdo to create overviews. Does wonders for
> > speed.
> > >
> > > I'm working right now with a global Landsat dataset, vrt, +4000 tiles,
> > roughly 700k by 300k pixels in total, and even this can be handled
> > efficiently once you've overviews.
> > >
> > > I mainly use uncompressed geotiffs.
> > >
> > > Kris
> > >
> > >
> > > -------- Original-Nachricht --------
> > >> Datum: Fri, 29 Apr 2011 14:08:00 +0200
> > >> Von: Patrice Vetsel <ubuntu at kagou.fr>
> > >> An: qgis-user at lists.osgeo.org
> > >> Betreff: [Qgis-user] Tif too slow to show
> > >
> > >> Hi,
> > >>
> > >> with an original raster (tif+tfw), from french cadastre, when I open
> it
> > >> under qgis, it's unusable because QGis is horribly slow.
> > >> with the same raster, but after using georef extension (tif+aux.xml),
> > QGis
> > >> is responsive
> > >>
> > >> here I put gdalinfo of the original (slow) and referenced :
> > >>
> > >> What's the problem with the first ? I would prefer to not have to
> > manually
> > >> georeference all my original rasters ;)
> > >>
> > >> In the same time, what's the most efficient raster type to use with
> > QGis ?
> > >>
> > >> Regards
> > >>
> > >>
> > >> Patrice Vetsel
> > >>
> > >> SLOW :
> > >> MacBook-Pro-de-Patrice-Vetsel:~ Patrice$
> > >> /Library/Frameworks/GDAL.framework/Programs/gdalinfo
> > ~/Desktop/3004221146000AB010200001.tif
> > >> Driver: GTiff/GeoTIFF
> > >> Files: /Users/Patrice/Desktop/3004221146000AB010200001.tif
> > >> /Users/Patrice/Desktop/3004221146000AB010200001.tfw
> > >> Size is 12329, 8760
> > >> Coordinate System is `'
> > >> GeoTransform =
> > >> 740551.2494, 0.078, 0.1506
> > >> 189669.7013, 0.1506, -0.078
> > >> Metadata:
> > >> TIFFTAG_ARTIST=JBG-PYV-APIC
> > >> TIFFTAG_XRESOLUTION=300
> > >> TIFFTAG_YRESOLUTION=300
> > >> TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)
> > >> Image Structure Metadata:
> > >> COMPRESSION=CCITTFAX4
> > >> INTERLEAVE=BAND
> > >> MINISWHITE=YES
> > >> Corner Coordinates:
> > >> Upper Left ( 740551.249, 189669.701)
> > >> Lower Left ( 741870.505, 188986.421)
> > >> Upper Right ( 741512.911, 191526.449)
> > >> Lower Right ( 742832.167, 190843.169)
> > >> Center ( 741691.708, 190256.435)
> > >> Band 1 Block=12329x1 Type=Byte, ColorInterp=Palette
> > >> Image Structure Metadata:
> > >> NBITS=1
> > >> Color Table (RGB with 2 entries)
> > >> 0: 255,255,255,255
> > >> 1: 0,0,0,255
> > >>
> > >>
> > >> OK :
> > >> MacBook-Pro-de-Patrice-Vetsel:~ Patrice$
> > >> /Library/Frameworks/GDAL.framework/Programs/gdalinfo
> > ~/Desktop/testgeo/AB_georef.tif
> > >> Driver: GTiff/GeoTIFF
> > >> Files: /Users/Patrice/Desktop/testgeo/AB_georef.tif
> > >> /Users/Patrice/Desktop/testgeo/AB_georef.tif.aux.xml
> > >> Size is 13446, 14968
> > >> Coordinate System is `'
> > >> Origin = (740550.783870017039590,191526.220101331215119)
> > >> Pixel Size = (0.169699598291267,-0.169699598291267)
> > >> Image Structure Metadata:
> > >> INTERLEAVE=BAND
> > >> Corner Coordinates:
> > >> Upper Left ( 740550.784, 191526.220)
> > >> Lower Left ( 740550.784, 188986.157)
> > >> Upper Right ( 742832.565, 191526.220)
> > >> Lower Right ( 742832.565, 188986.157)
> > >> Center ( 741691.674, 190256.188)
> > >> Band 1 Block=13446x1 Type=Byte, ColorInterp=Palette
> > >> Color Table (RGB with 256 entries)
> > >> 0: 255,255,255,255
> > >> 1: 0,0,0,255
> > >> 2: 0,0,0,255
> > >> 3: 0,0,0,255
> > >> 4: 0,0,0,255
> > >> 5: 0,0,0,255
> > >> 6: 0,0,0,255
> > >> 7: 0,0,0,255
> > >> 8: 0,0,0,255
> > >> 9: 0,0,0,255
> > >> 10: 0,0,0,255
> > >> 11: 0,0,0,255
> > >> 12: 0,0,0,255
> > >> 13: 0,0,0,255
> > >> 14: 0,0,0,255
> > >> 15: 0,0,0,255
> > >> 16: 0,0,0,255
> > >> 17: 0,0,0,255
> > >> 18: 0,0,0,255
> > >> 19: 0,0,0,255
> > >> 20: 0,0,0,255
> > >> 21: 0,0,0,255
> > >> 22: 0,0,0,255
> > >> 23: 0,0,0,255
> > >> 24: 0,0,0,255
> > >> 25: 0,0,0,255
> > >> 26: 0,0,0,255
> > >> 27: 0,0,0,255
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> > >> 255: 0,0,0,255
> > >>
> > >>
> > >> _______________________________________________
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> > >> Qgis-user at lists.osgeo.org
> > >> http://lists.osgeo.org/mailman/listinfo/qgis-user
> > >
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>
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