[Qgis-user] Tif too slow to show
Kris Nackaerts
knackaerts at gmx.net
Fri Apr 29 05:57:16 PDT 2011
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
> >> 28: 0,0,0,255
> >> 29: 0,0,0,255
> >> 30: 0,0,0,255
> >> 31: 0,0,0,255
> >> 32: 0,0,0,255
> >> 33: 0,0,0,255
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> >> 35: 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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