Hoi Stefan No it doesn'nt need to be gauss resampling method. We found that GeoTIFF with overview index performs fastest.
Yours, S. 2014-10-13 15:22 GMT+02:00 Ziegler Stefan <[email protected]>: > Hi Stefan > > Does it need to be "gauss" as resampling method? You can use QGIS' own > resampling functionality to get nice raster rendering. > > Regards > Stefan > >> -----Ursprüngliche Nachricht----- >> Von: [email protected] >> [mailto:[email protected]] Im >> Auftrag von Jonathan Moules >> Gesendet: Montag, 13. Oktober 2014 15:05 >> An: 'Stefan Keller'; '[email protected]'; 'qgis-user' >> Betreff: Re: [Qgis-user] Generating GeoTIFF overview ("gdaladdo -r gauss >> ...") takes >> days for 2GB file... >> >> 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: [email protected] >> [mailto:[email protected]] >> On Behalf Of Stefan Keller >> Sent: Sunday, October 12, 2014 1:34 PM >> To: [email protected]; 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 >> [email protected] >> 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+TFa >> pmLjYzc0LQlVsaeWay487vQIAp6KUWSPFO0UaI8cQ== 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 >> [email protected] >> http://lists.osgeo.org/mailman/listinfo/qgis-user _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
