Hi, Yes, you can change the tile size. It is documented in https://gdal.org/drivers/raster/gtiff.html, BLOCKXSIZE and BLOCKYSIZE. Make a controlled test and measure timings. Optimizing one thing may lead to something suboptimal in another place and what is optimal for me does not need to be optimal for you because of different source data and hardware.
-Jukka Rahkonen- -----Alkuperäinen viesti----- Lähettäjä: elmir <[email protected]> Lähetetty: maanantai 27. tammikuuta 2020 15.12 Vastaanottaja: Rahkonen Jukka (MML) <[email protected]> Kopio: Simon <[email protected]>; [email protected] Aihe: Re: [gdal-dev] mosaicking is very slow 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
