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 <knackae...@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 <ubu...@kagou.fr> > > An: Kris Nackaerts <knackae...@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 <ubu...@kagou.fr> > > >> An: qgis-user@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 > > >> 34: 0,0,0,255 > > >> 35: 0,0,0,255 > > >> 36: 0,0,0,255 > > >> 37: 0,0,0,255 > > >> 38: 0,0,0,255 > > >> 39: 0,0,0,255 > > >> 40: 0,0,0,255 > > >> 41: 0,0,0,255 > > >> 42: 0,0,0,255 > > >> 43: 0,0,0,255 > > >> 44: 0,0,0,255 > > >> 45: 0,0,0,255 > > >> 46: 0,0,0,255 > > >> 47: 0,0,0,255 > > >> 48: 0,0,0,255 > > >> 49: 0,0,0,255 > > >> 50: 0,0,0,255 > > >> 51: 0,0,0,255 > > >> 52: 0,0,0,255 > > >> 53: 0,0,0,255 > > >> 54: 0,0,0,255 > > >> 55: 0,0,0,255 > > >> 56: 0,0,0,255 > > >> 57: 0,0,0,255 > > >> 58: 0,0,0,255 > > >> 59: 0,0,0,255 > > >> 60: 0,0,0,255 > > >> 61: 0,0,0,255 > > >> 62: 0,0,0,255 > > >> 63: 0,0,0,255 > > >> 64: 0,0,0,255 > > >> 65: 0,0,0,255 > > >> 66: 0,0,0,255 > > >> 67: 0,0,0,255 > > >> 68: 0,0,0,255 > > >> 69: 0,0,0,255 > > >> 70: 0,0,0,255 > > >> 71: 0,0,0,255 > > >> 72: 0,0,0,255 > > >> 73: 0,0,0,255 > > >> 74: 0,0,0,255 > > >> 75: 0,0,0,255 > > >> 76: 0,0,0,255 > > >> 77: 0,0,0,255 > > >> 78: 0,0,0,255 > > >> 79: 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> > >> 171: 0,0,0,255 > > >> 172: 0,0,0,255 > > >> 173: 0,0,0,255 > > >> 174: 0,0,0,255 > > >> 175: 0,0,0,255 > > >> 176: 0,0,0,255 > > >> 177: 0,0,0,255 > > >> 178: 0,0,0,255 > > >> 179: 0,0,0,255 > > >> 180: 0,0,0,255 > > >> 181: 0,0,0,255 > > >> 182: 0,0,0,255 > > >> 183: 0,0,0,255 > > >> 184: 0,0,0,255 > > >> 185: 0,0,0,255 > > >> 186: 0,0,0,255 > > >> 187: 0,0,0,255 > > >> 188: 0,0,0,255 > > >> 189: 0,0,0,255 > > >> 190: 0,0,0,255 > > >> 191: 0,0,0,255 > > >> 192: 0,0,0,255 > > >> 193: 0,0,0,255 > > >> 194: 0,0,0,255 > > >> 195: 0,0,0,255 > > >> 196: 0,0,0,255 > > >> 197: 0,0,0,255 > > >> 198: 0,0,0,255 > > >> 199: 0,0,0,255 > > >> 200: 0,0,0,255 > > >> 201: 0,0,0,255 > > >> 202: 0,0,0,255 > > >> 203: 0,0,0,255 > > >> 204: 0,0,0,255 > > >> 205: 0,0,0,255 > > >> 206: 0,0,0,255 > > >> 207: 0,0,0,255 > > >> 208: 0,0,0,255 > > >> 209: 0,0,0,255 > > >> 210: 0,0,0,255 > > >> 211: 0,0,0,255 > > >> 212: 0,0,0,255 > > >> 213: 0,0,0,255 > > >> 214: 0,0,0,255 > > >> 215: 0,0,0,255 > > >> 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Qgis-user@lists.osgeo.org > > >> http://lists.osgeo.org/mailman/listinfo/qgis-user > > > > > > -- > > > Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir > > > belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de > > > > -- > NEU: FreePhone - kostenlos mobil telefonieren und surfen! > Jetzt informieren: http://www.gmx.net/de/go/freephone > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/qgis-user >
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