Jonathan Thanks for asking. See below the output of gdalinfo.
Yours, S. >gdalinfo zh.tif Driver: GTiff/GeoTIFF Files: zh.tif Size is 152498, 190232 Coordinate System is: PROJCS["CH1903 / LV03", GEOGCS["CH1903", DATUM["CH1903", SPHEROID["Bessel 1841",6377397.155,299.1528128000009, AUTHORITY["EPSG","7004"]], TOWGS84[674.4,15.1,405.3,0,0,0,0], AUTHORITY["EPSG","6149"]], PRIMEM["Greenwich",0], UNIT["degree",0.0174532925199433], AUTHORITY["EPSG","4149"]], PROJECTION["Hotine_Oblique_Mercator"], PARAMETER["latitude_of_center",46.95240555555556], PARAMETER["longitude_of_center",7.439583333333333], PARAMETER["azimuth",90], PARAMETER["rectified_grid_angle",90], PARAMETER["scale_factor",1], PARAMETER["false_easting",600000], PARAMETER["false_northing",200000], UNIT["metre",1, AUTHORITY["EPSG","9001"]], AUTHORITY["EPSG","21781"]] Origin = (669243.920000001790000,283343.191250000090000) Pixel Size = (0.312500368857287,-0.312499428329607) Metadata: AREA_OR_POINT=Area Image Structure Metadata: COMPRESSION=LZW INTERLEAVE=BAND Corner Coordinates: Upper Left ( 669243.920, 283343.191) ( 8d21'43.79"E, 47d41'54.41"N) Lower Left ( 669243.920, 223895.800) ( 8d21'10.57"E, 47d 9'49.48"N) Upper Right ( 716899.601, 283343.191) ( 8d59'49.11"E, 47d41'30.00"N) Lower Right ( 716899.601, 223895.800) ( 8d58'53.05"E, 47d 9'25.32"N) Center ( 693071.761, 253619.496) ( 8d40'24.09"E, 47d25'41.40"N) Band 1 Block=152498x1 Type=Byte, ColorInterp=Gray Min=1.000 Max=255.000 Minimum=1.000, Maximum=255.000, Mean=231.759, StdDev=73.234 NoData Value=0 Overviews: 76249x95116, 38125x47558, 19063x23779, 9532x11890, 4766x5945, 2383x 2973, 1192x1487 Metadata: STATISTICS_MAXIMUM=255 STATISTICS_MEAN=231.75856617323 STATISTICS_MINIMUM=1 STATISTICS_STDDEV=73.233598475527 2014-10-13 15:05 GMT+02:00 Jonathan Moules <j.mou...@hrwallingford.com>: > Hi Stefan, > How large is the image? As in, pixel width & height. > > Also the GDALinfo would be helpful. > > 7 days is a very long time. I've seen times like that myself for images that > were 100,000*50,000 or similar dimensions where there was (still is?) an > issue with the pyramiding function in GDAL (it was re-reading the data again > and again). > > Cheers, > Jonathan > > -----Original Message----- > From: qgis-user-boun...@lists.osgeo.org > [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Stefan Keller > Sent: Sunday, October 12, 2014 1:34 PM > To: gdal-...@lists.osgeo.org; qgis-user > Subject: [Qgis-user] Generating GeoTIFF overview ("gdaladdo -r gauss ...") > takes days for 2GB file... > > Hi, > > I have a GeoTIFF file of 2GB size. Now, this question is about gdaladdo and > how to optimize loading time of such a large raster file. > > According to my observations QGIS has fastest loading times when it's a > single GeoTIFF file with overview images. > > Q.1: Does anybody have tipps for even faster solutions loading raster files > into in QGIS (prepared by OGR or other preprocessors)? > > The command "gdaladdo -r gauss C:\SG.tif 2 4 8 16 32 64 128 256" > takes actually about 7 days on a Lenovo notebook. > > Q2.: Any hint's on how to accelerate this (or to other tools generating > overviews/pyramids)? > > Yours, S. > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/qgis-user > > > This message has been scanned for viruses by MailControl - www.mailcontrol.com > > > > Click > https://www.mailcontrol.com/sr/pdM3aunlCjzGX2PQPOmvUgEBY15Clgt1cLVtYJoNw+TFapmLjYzc0LQlVsaeWay487vQIAp6KUWSPFO0UaI8cQ== > to report this email as spam. > > ________________________________ > > HR Wallingford and its subsidiaries uses faxes and emails for confidential > and legally privileged business communications. They do not of themselves > create legal commitments. Disclosure to parties other than addressees > requires our specific consent. We are not liable for unauthorised disclosures > nor reliance upon them. > If you have received this message in error please advise us immediately and > destroy all copies of it. > > HR Wallingford Limited > Howbery Park, Wallingford, Oxfordshire, OX10 8BA, United Kingdom > Registered in England No. 02562099 > > ________________________________ _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user