Hi,
I guessed so. Is that your own invention or is it documented somewhere that
undefined GCPs should be marked that way by using INF? I ask because if it is
something that should be reliable then I may have use for that feature in the
future.
Problem may be limited to vrt. This test seems to pass
gdal_translate -gcp 0 0 inf inf test.tif inftest.tif
gdalinfo inftest.tif
…
GCP[ 0]: Id=1, Info=
(0,0) -> (inf,inf,0)
-Jukka Rahkonen-
Lähettäjä: Pierluigi Guasqui <guas...@actgate.com>
Lähetetty: torstai 25. tammikuuta 2024 14.16
Vastaanottaja: Rahkonen Jukka <jukka.rahko...@maanmittauslaitos.fi>
Aihe: Re: [gdal-dev] Bad values when reading GCPs from a VRT file with gdalinfo
in GDAL 3.8.3
Hello Jukka,
in general using infinite values is to mark undefined or invalid GCPs.
Pierluigi
On Thu, Jan 25, 2024 at 12:44 PM Rahkonen Jukka
<jukka.rahko...@maanmittauslaitos.fi<mailto:jukka.rahko...@maanmittauslaitos.fi>>
wrote:
Hi,
Out of curiosity, what is the purpose of using inf or -inf as values? Is it to
use them as placeholders telling that you do not know yet what the
georeferenced coordinates of the ground control points are?
-Jukka Rahkonen-
Lähettäjä: gdal-dev
<gdal-dev-boun...@lists.osgeo.org<mailto:gdal-dev-boun...@lists.osgeo.org>>
Puolesta Pierluigi Guasqui via gdal-dev
Lähetetty: torstai 25. tammikuuta 2024 13.34
Vastaanottaja: gdal-dev@lists.osgeo.org<mailto:gdal-dev@lists.osgeo.org>
Aihe: [gdal-dev] Bad values when reading GCPs from a VRT file with gdalinfo in
GDAL 3.8.3
Dear GDAL team,
I am using GDAL version 3.8.3 and I am trying to extract GCPs values with
gdalinfo tool from a VRT file (attached).
As you can see by looking at the VRT file with a text editor GCP XYZ values are
infinite values. When I read GCPs from the attached VRT file with gdalinfo
(latest version GDAL v. 3.8.3) I am getting all zeros:
GCP[ 0]: Id=0, Info=
(0,0) -> (0,0,0)
Instead, if I use gdalinfo (GDAL v. 3.6.3) I am getting the correct values:
GCP[ 0]: Id=0, Info=
(0,0) -> (inf,inf,-inf)
Is this a bug with GDAL 3.8.3?
Thank you for your help!
--
Pierluigi Guasqui
Software Engineer
Applied Coherent Technology Corporation (ACT)
www.actgate.com<http://www.actgate.com/>
--
Pierluigi Guasqui
Software Engineer
Applied Coherent Technology Corporation (ACT)
www.actgate.com<http://www.actgate.com/>
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