[gdal-dev] cogger output has no overviews?

[thomas bonfort]

Matt,
In the general case, cogger supports a tiff with internal overviews, i.e.
without a .tif.ovr sidecar file. The advanced usecase which takes multiple
files is a remnant of the time when gdaladdo was much slower than
successive runs of "gdal_translate -outsize 50% 50%", or for when you need
specific compression/tiling options for the overviews that gdaladdo does
not support.
In your scenario, you should delete your .tif.ovr file, run "gdaladdo -r
average myfile.tif 2 4 8 16 ..." and then "cogger myfile.tif"
Direct support for .tif.ovr files could be something we can support if
proposed as a pull request, but is not on our roadmap.
Regards,
Thomas

Le mar. 8 juin 2021 à 20:21, <Matt.Wilkie at yukon.ca> a écrit :

> I forgot to add: I tried adding the .ovr file in a manner similar to the
> Cogger readme example but got an error:
>
>
>
> ~~~
>
> $ cogger -output test.tif
> SPOT6_321_BeaverRiver_08Sep2018_NAD83_YAlbers.tif
> SPOT6_321_BeaverRiver_08Sep2018_NAD83_YAlbers.tif.ovr
>
>
>
> mucog write: load: cannot load multiple tifs if they contain overviews
>
> ~~~
>
>
>
> -Matt
>
>
>
> *From:* Matt.Wilkie
> *Sent:* June 8, 2021 11:19 AM
> *To:* Gdal Dev <gdal-dev at lists.osgeo.org>
> *Subject:* cogger output has no overviews?
>
>
>
> Hi,
>
>
>
> I took cogger for a first test drive and I’m confused. I’m relatively new
> to the world of Cloud Optimized Geotiffs, so I don’t know if my confusion
> is about the COG format itself or cogger:
>
>
>
> I fed a jpeg-in-geotiff file with external overviews (tif.ovr) and mask
> (tif.msk) to cogger. The output contains neither overviews or mask. Is that
> the expected result?
>
>
>
> It’s my understanding not having overviews is the rare case, and do that
> only if you know what you're doing (I don’t!). Is there something I should
> be doing to keep or regenerate the overviews?
>
>
>
> Gdalinfo reports for in and output attached. Gdal’s validate-cog python
> script says the output is a valid cog, also attached.
>
>
>
> Best,
>
>
>
> *Matt Wilkie*
>
> Geomatics Developer & Administrator
>
> Environment | Technology, Innovation and Mapping
>
> T 867-667-8133 | *Yukon.ca <http://yukon.ca/>*
>
> *Hours: 08:30-16:30, Mon-Wed: Office, Thu: Remote, Fri: Away.*
>
>
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