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<p>I meant that the input GeoTIFF file should use the tile size and
compression method that you expect for the final COG, to be usable
with cogger. If you need to re-tile or change compression method,
use the GDAL COG driver<br>
</p>
<div class="moz-cite-prefix">Le 07/06/2021 à 23:17,
<a class="moz-txt-link-abbreviated" href="mailto:Matt.Wilkie@yukon.ca">Matt.Wilkie@yukon.ca</a> a écrit :<br>
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<p class="MsoNormal">…I'd expect it to be much faster than
gdal_translate -of COG (if your input is GeoTIFF and always
properly tiled and compressed of course!).<span></span></p>
<p class="MsoNormal"><span> </span></p>
<p class="MsoNormal"><span>I’m confident I know what a properly
compressed geotiff is, but what is a properly tiled one? (or
if it’s easier to define: what are improperly tiled
geotiff?)</span></p>
<p class="MsoNormal"><span> </span></p>
<p class="MsoNormal"><span> </span></p>
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<p class="MsoNormal"><span lang="EN-US">-Matt</span><i><span></span></i></p>
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<p class="MsoNormal"><span> </span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span
lang="EN-US"> Even Rouault
<a class="moz-txt-link-rfc2396E" href="mailto:even.rouault@spatialys.com"><even.rouault@spatialys.com></a>
<br>
<b>Sent:</b> June 4, 2021 9:33 AM<br>
<b>To:</b> thomas bonfort
<a class="moz-txt-link-rfc2396E" href="mailto:thomas.bonfort@gmail.com"><thomas.bonfort@gmail.com></a>; Matt.Wilkie
<a class="moz-txt-link-rfc2396E" href="mailto:Matt.Wilkie@yukon.ca"><Matt.Wilkie@yukon.ca></a><br>
<b>Cc:</b> Gdal Dev <a class="moz-txt-link-rfc2396E" href="mailto:gdal-dev@lists.osgeo.org"><gdal-dev@lists.osgeo.org></a><br>
<b>Subject:</b> Re: [gdal-dev] Introducing the cogger
and godal projects</span></p>
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<p>I haven't benchmarked cogger but I'd expect it to be much
faster than gdal_translate -of COG (if your input is GeoTIFF
and always properly tiled and compressed of course!).
gdal_translate -of COG uses generic GDAL API to acquire input
data, which implies decompression / recompression. And in
particular, if using input GeoTIFF with lossy compressed
methods such as JPEG or WebP, cogger will avoid adding any new
loss.</p>
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<p class="MsoNormal"><span>Le 04/06/2021 à 18:28, thomas
bonfort a écrit :</span></p>
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<p class="MsoNormal"><span>I haven't extensively used -of
COG (the cogger code actually predates the cog driver)
but iirc there are at least some cases where it uses
an intermediate file, which would imply that cogger
does offer some speedups. I'll let Even confirm...</span></p>
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<p class="MsoNormal"><span>Regards,</span></p>
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<p class="MsoNormal"><span>Thomas</span></p>
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<p class="MsoNormal"><span>Le ven. 4 juin 2021 à
18:14, <<a href="mailto:Matt.Wilkie@yukon.ca"
moz-do-not-send="true">Matt.Wilkie@yukon.ca</a>>
a écrit :</span></p>
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<p class="MsoNormal"><span>Is cogger specifically for
the scenario where your converting a large imagery
library that already exists, but isn't cloud
optimized? i.e. Does it offer any advantages over
the one step `gdal_translate -of cog ...` when
starting fresh?<br>
<br>
Cheers,<br>
<br>
Matt<br>
Geomatics Analyst | Environment | T 867-667-8133 |
Yukon.ca<br>
Hours: 08:30-16:30, Tue-Wed: Office, Thu-Fri:
Remote.</span></p>
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<p class="MsoNormal"><span><br>
<br>
</span></p>
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