There's a whole discussion starting at comment
https://github.com/OSGeo/gdal/pull/7256#issuecomment-1433318699 about
how the old approach implicitly assuming same georeferencing for MS and
PAN bands could be wrong for some data products, which could lead to
increasing errors on right and bottom edges of images. It was decided
that it was better for pansharpening to require having explicit
geotransform in its inputs rather than making possibly incorrect guesses.
Even
Le 15/07/2023 à 16:13, Ferdinand a écrit :
Hi Evan,
Thanks for the response, I'll give it a go.
As you are on the ticket I mentioned, I assume the rationale behind
the change was to remove the implicit assumption of overlap?
Was there also a subpixel shift then when doing it the "old" way?
Cheers,
Ferdi
On Fri, Jul 14, 2023 at 10:50 PM Even Rouault
wrote:
Ferdinand,
you can for example use "gdal_edit.py -ro -a_ullr X1 Y1 X2 Y2
your.tif" to create a geotransform in a sidecar .aux.xml file. If
the pan and ms images have the same extent, you could possibly
just use -a_ullr 0 0 1 -1 (untested though). This hypothesis is
not totally true as there's some subpixel shift for those products
between the pan and ms bands if I remember well, so you might need
to tune that a bit to get optimal results, but generally assuming
same extent should give you already a decent result.
Even
Le 14/07/2023 à 17:36, Ferdinand a écrit :
Hi all,
We do stereo photogrammetry on Pleiades/PNeo images, and in one
case we run our algorithms on pansharpened images.
Our workflow therefore was that we would pan-sharpen the images
and then run our stereo processing (using the panchromatic RPC
model for the pansharpened image).
However, with the change in this PR:
https://github.com/OSGeo/gdal/pull/7373 which was integrated into
release 3.7.0, this is no longer possible. gdal_pansharpen.py now
gives: `RuntimeError: Panchromatic band has no associated
geotransform`.
What is the recommended workflow for this now? We can't
orthorectify the images first, as we need the raw row/column
information in the image in order for the photogrammetry
processing to work.
Is there some other way to add a geotransform that does not
require warping the image?
Cheers,
Ferdi
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