[Qgis-user] Tif too slow to show
Kris Nackaerts
knackaerts at gmx.net
Fri Apr 29 05:21:51 PDT 2011
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
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>
>
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