[Qgis-user] Tif too slow to show
Luca Lanteri
mescal72 at gmail.com
Fri Apr 29 23:17:01 PDT 2011
yes, in the 1st tiff header the
GeoTransform =
740551.2494, 0.078, 0.1506
189669.7013, 0.1506, -0.078
it means
GeoTransform =
<lon offset> <scale related> <nonzero rotation>
<lat offset> <nonzero rotation> <scale related>
if you transform the N-S oriented image in a NS oriented image I think the
image will be magically displayed faster.
Of course, adding tiled and overview with gdal should improve the
performance.
I think the problem isn't in the GDAL drivers because I try to open the same
"slow" image with others OS GIS and the it's is displayed well.
2011/4/29 Patrice Vetsel <ubuntu at kagou.fr>
> Is it because the original is not Nort-South oriented and must be rotated
> by QGis ?
>
>
> Le 29/04/11 14:08, Patrice Vetsel a écrit :
>
> 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: 0,0,0,255
>> 80: 0,0,0,255
>> 81: 0,0,0,255
>> 82: 0,0,0,255
>> 83: 0,0,0,255
>> 84: 0,0,0,255
>> 85: 0,0,0,255
>> 86: 0,0,0,255
>> 87: 0,0,0,255
>> 88: 0,0,0,255
>> 89: 0,0,0,255
>> 90: 0,0,0,255
>> 91: 0,0,0,255
>> 92: 0,0,0,255
>> 93: 0,0,0,255
>> 94: 0,0,0,255
>> 95: 0,0,0,255
>> 96: 0,0,0,255
>> 97: 0,0,0,255
>> 98: 0,0,0,255
>> 99: 0,0,0,255
>> 100: 0,0,0,255
>> 101: 0,0,0,255
>> 102: 0,0,0,255
>> 103: 0,0,0,255
>> 104: 0,0,0,255
>> 105: 0,0,0,255
>> 106: 0,0,0,255
>> 107: 0,0,0,255
>> 108: 0,0,0,255
>> 109: 0,0,0,255
>> 110: 0,0,0,255
>> 111: 0,0,0,255
>> 112: 0,0,0,255
>> 113: 0,0,0,255
>> 114: 0,0,0,255
>> 115: 0,0,0,255
>> 116: 0,0,0,255
>> 117: 0,0,0,255
>> 118: 0,0,0,255
>> 119: 0,0,0,255
>> 120: 0,0,0,255
>> 121: 0,0,0,255
>> 122: 0,0,0,255
>> 123: 0,0,0,255
>> 124: 0,0,0,255
>> 125: 0,0,0,255
>> 126: 0,0,0,255
>> 127: 0,0,0,255
>> 128: 0,0,0,255
>> 129: 0,0,0,255
>> 130: 0,0,0,255
>> 131: 0,0,0,255
>> 132: 0,0,0,255
>> 133: 0,0,0,255
>> 134: 0,0,0,255
>> 135: 0,0,0,255
>> 136: 0,0,0,255
>> 137: 0,0,0,255
>> 138: 0,0,0,255
>> 139: 0,0,0,255
>> 140: 0,0,0,255
>> 141: 0,0,0,255
>> 142: 0,0,0,255
>> 143: 0,0,0,255
>> 144: 0,0,0,255
>> 145: 0,0,0,255
>> 146: 0,0,0,255
>> 147: 0,0,0,255
>> 148: 0,0,0,255
>> 149: 0,0,0,255
>> 150: 0,0,0,255
>> 151: 0,0,0,255
>> 152: 0,0,0,255
>> 153: 0,0,0,255
>> 154: 0,0,0,255
>> 155: 0,0,0,255
>> 156: 0,0,0,255
>> 157: 0,0,0,255
>> 158: 0,0,0,255
>> 159: 0,0,0,255
>> 160: 0,0,0,255
>> 161: 0,0,0,255
>> 162: 0,0,0,255
>> 163: 0,0,0,255
>> 164: 0,0,0,255
>> 165: 0,0,0,255
>> 166: 0,0,0,255
>> 167: 0,0,0,255
>> 168: 0,0,0,255
>> 169: 0,0,0,255
>> 170: 0,0,0,255
>> 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
>> 216: 0,0,0,255
>> 217: 0,0,0,255
>> 218: 0,0,0,255
>> 219: 0,0,0,255
>> 220: 0,0,0,255
>> 221: 0,0,0,255
>> 222: 0,0,0,255
>> 223: 0,0,0,255
>> 224: 0,0,0,255
>> 225: 0,0,0,255
>> 226: 0,0,0,255
>> 227: 0,0,0,255
>> 228: 0,0,0,255
>> 229: 0,0,0,255
>> 230: 0,0,0,255
>> 231: 0,0,0,255
>> 232: 0,0,0,255
>> 233: 0,0,0,255
>> 234: 0,0,0,255
>> 235: 0,0,0,255
>> 236: 0,0,0,255
>> 237: 0,0,0,255
>> 238: 0,0,0,255
>> 239: 0,0,0,255
>> 240: 0,0,0,255
>> 241: 0,0,0,255
>> 242: 0,0,0,255
>> 243: 0,0,0,255
>> 244: 0,0,0,255
>> 245: 0,0,0,255
>> 246: 0,0,0,255
>> 247: 0,0,0,255
>> 248: 0,0,0,255
>> 249: 0,0,0,255
>> 250: 0,0,0,255
>> 251: 0,0,0,255
>> 252: 0,0,0,255
>> 253: 0,0,0,255
>> 254: 0,0,0,255
>> 255: 0,0,0,255
>>
>>
>> _______________________________________________
>> Qgis-user mailing list
>> Qgis-user at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/qgis-user
>>
>
> _______________________________________________
> Qgis-user mailing list
> Qgis-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-user
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20110430/225bdc3f/attachment.html>
More information about the Qgis-user
mailing list