Luigi,
The GDAL GeoTIFF or COG drivers have currently no provision for writing
EXIF (the fact that you see Exif.Image.Software is due to, I assume,
exiftool synthetizing that information from the regular Software TIFF
tag, which is propagated), so I don't have any solution to offer. Could
potentially be implemented, but not a 5-minute job.
"Breaking" the COG structure shouldn't be the end of the world. The
breakage should be minimal. That will just cause one extra HTTP GET to
clients. 95% of the value of COG is just being a tiled GeoTIFF with
overviews. Putting all metadata (including the main TIFF directory) at
beginning of the file is just the cherry on the cake.
(a quick skim at https://github.com/airbusgeo/cogger which is useful to
COGify a tiled GeoTIFF doesn't show any provision for EXIF, so I don't
think you can use it for your use case)
The XMP TIFF tag is propagated:
$ gdal_translate autotest/gdrivers/data/gtiff/byte_with_xmp.tif out.tif
-of cog
$ gdalinfo out.tif -mdd all | grep XMP
Metadata (xml:XMP):
<rdf:li>XMP</rdf:li>
Even
Le 14/11/2024 à 12:39, Luigi Pirelli via gdal-dev a écrit :
Hi,
I'm struggling to generate a COG maintaining the original (or at least
a selected subset of) Exif and XMP tags (I ses that Iptc tags are not
propagated at all, but I'm not interested in them).
I used gda_translate via CLI or python and the best option seems
-strict that, theoretically should maintain all original tags.
But some standard tags are propagated and others not!
e.g.
Exif.Image.Software yes
Exif.Photo.CameraOwnerName no
Exif.Image.Artist yes
Exif.Image.Copyright yes
Exif.Image.DateTimeOriginal no
Exif.Photo.DateTimeOriginal no
Exif.Image.Model no
Exif.Image.CameraSerialNumber no
etc
It is a bug? a feature? if a bug in any case is there a way to
override? The reason to find a solution is that adding tags over a COG
with "standard" tools like exiftool, exiv2 etc destroy COG structure.
So I need to add or modify tags before converting to COG.
any suggestion?
Luigi Pirelli
mails: lui...@gmail.com
luigi.pire...@geobeyond.it
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