hi, thanks for nicely explaining. Can i change size of tile, 256*256; for speeding up?
‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ On Monday, January 27, 2020 9:04 PM, Rahkonen Jukka (MML) <[email protected]> wrote: > Hi, > > If your source images are 4 GB then their size is at least 40000 by 40000 > pixels, or more if they are compressed. If gdalwarp now needs 256256 pixels > worth of source data, from a striped image it must read 25640000 (rowspixels > per row), while from tiled source it can read just from 1 to 4 tiles, 256256 > each. > > Pre-processing is additional load but if you pay 10 units extra for tiling > and then save 100 units in warping you are still a winner. > > Make copies as > gdal_translate -of GTiff -co tiled=yes -co compress=LZW input1.tif copy1.tif > > Then create a new VRT file. Absolutely do not remove -co tiled=yes from the > gdalwarp command or you'll demand GDAL to write at least 400000 pixels wide > stripes. > > -Jukka Rahkonen- > > -----Alkuperäinen viesti----- > Lähettäjä: Simon [email protected] > Lähetetty: maanantai 27. tammikuuta 2020 13.18 > Vastaanottaja: Rahkonen Jukka (MML) [email protected] > Kopio: [email protected] > Aihe: Re: [gdal-dev] mosaicking is very slow > > Hi, > Thanks for your answer. The source images are not tiled. So, how can I tile > them? Is not it additional load? I will try removing these ones: > --config GDAL_CACHEMAX 8000 > -co TILED=YES > > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ > On Monday, January 27, 2020 7:48 PM, jratike80 > [email protected] wrote: > > > Hi, > > I would suggest to remove --config GDAL_CACHEMAX 8000 first. Then I > > would check if the source images are tiled. If they are not it could > > be worth an extra step to make tiled copies. > > -Jukka Rahkonen- > > Simon-4 wrote > > > > > Hello everyone, > > > I am stiching aroung 100 geotiff images each of around 4gb. However, > > > translating the vrt file into geotiff is going on for days. > > > gtranslate --config GDAL_CACHEMAX 8000 -co TILED=YES -co > > > COMPRESS=LZW -co BIGTIFF=YES infile.vrt outfile.tif How can I speed > > > up it? > > > Thank you. > > > Simon > > > gdal-dev mailing list > > > > > [email protected] > > > > > https://lists.osgeo.org/mailman/listinfo/gdal-dev > > > > -- > > Sent from: http://osgeo-org.1560.x6.nabble.com/GDAL-Dev-f3742093.html > > gdal-dev mailing list > > [email protected] > > https://lists.osgeo.org/mailman/listinfo/gdal-dev > > gdal-dev mailing list > [email protected] > https://lists.osgeo.org/mailman/listinfo/gdal-dev _______________________________________________ gdal-dev mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/gdal-dev
