[gdal-dev] mosaicking is very slow

[elmir]

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) <jukka.rahkonen at maanmittauslaitos.fi> 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 twinbirds at protonmail.com
> Lähetetty: maanantai 27. tammikuuta 2020 13.18
> Vastaanottaja: Rahkonen Jukka (MML) jukka.rahkonen at maanmittauslaitos.fi
> Kopio: gdal-dev at lists.osgeo.org
> 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 jukka.rahkonen at maanmittauslaitos.fi 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
> >
> > > gdal-dev at .osgeo
> >
> > > https://lists.osgeo.org/mailman/listinfo/gdal-dev
> >
> > --
> > Sent from: http://osgeo-org.1560.x6.nabble.com/GDAL-Dev-f3742093.html
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>
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