Over the network it takes 23 seconds:
time gdal_translate -oo OVERVIEW_LEVEL=NONE -outsize 219 226
/vsicurl/https://github.com/mdsumner/cog-example/raw/main/cog/sentinel-image.tif
net.tif
real 0m23.909s
user 0m4.374s
sys 0m1.021s
Saving the file locally and translating it's fractional second:
time gdal_translate -oo OVERVIEW_LEVEL=NONE -outsize 219 226 sent.tif
local.tif
real 0m0.143s
user 0m0.107s
sys 0m0.036s
My guess is there are numerous reads of the file and across a network,
depending on server load, etc, it may take muchlonger.
On 11/24/23 15:44, Michael Sumner via gdal-dev wrote:
When I translate this GeoTIFF to 10% original size, it's very very slow
if OVERVIEW_LEVEL=NONE is set.
The GeoTIFF has no overviews.
export
dsn="/vsicurl/https://github.com/mdsumner/cog-example/raw/main/cog/sentinel-image.tif <https://github.com/mdsumner/cog-example/raw/main/cog/sentinel-image.tif>"
## takes *forever*
gdal_translate $dsn out.tif -outsize 219 226 -oo OVERVIEW_LEVEL=NONE
## works fast as expected
gdal_translate $dsn out.tif -outsize 219 226
I found this in a package that has a global open option setting for
overviews for subsampling with RasterIO(). There we could detect that
overviews are not present, or even just not set it at all ... (better to
use GDALwarp() for general cases IMO).
But, is there a good reason why setting that open option affects
translate for sources with no overviews?
I'm in master at ebac6b74a429fa6eeeb94edd074b6cb60072a35f
Cheers, Mike
--
Michael Sumner
Software and Database Engineer
Australian Antarctic Division
Hobart, Australia
e-mail: mdsum...@gmail.com <mailto:mdsum...@gmail.com>
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