[gdal-dev] remote png and aux file

[Even Rouault]

yes you are demanding a bit too much to the simple HTTP driver (the one 
that kicks in with http:// without /vsicurl/ prefixing). It just 
dowloads the content pointed by the URL , put in in a /vsimem/ file and 
then let other drivers try to recognize that. The logic to query side 
car files can't work there because the PNG driver will try to open 
/vsimem/something.png.aux.xml .

Le 31/10/2025 à 05:26, Michael Sumner via gdal-dev a écrit :
> > Should it be picking that up, or is that too much to ask with the 
> /vsi* protocol?
>
>  I meant to say:   ' Should it be picking that up, or is that too much 
> to ask *without* the /vsi* protocol?'
>
> On Fri, Oct 31, 2025 at 3:21 PM Michael Sumner <mdsumner at gmail.com> wrote:
>
>     I've noticed that a sidecar .aux.xml for a PNG is not picked up on
>     a bare url:
>
>      gdal.Open("https://projects.pawsey.org.au/geotar0/sentinel-2-c1-l2a/2023/01/03/Macquarie_Island_Station_2023-01-03.png").GetGeoTransform()
>     (0.0, 1.0, 0.0, 0.0, 0.0, 1.0)
>
>     gdal.Open("/vsicurl/https://projects.pawsey.org.au/geotar0/sentinel-2-c1-l2a/2023/01/03/Macquarie_Island_Station_2023-01-03.png").GetGeoTransform()
>     (-3000.0, 10.0, 0.0, 3000.0, 0.0, -10.0)
>
>     Should it be picking that up, or is that too much to ask with the
>     /vsi* protocol?  (I don't have an opinion, just vaguely expected
>     that it would find the sidecar file without /vsi*).
>
>     Cheers, Mike
>
>
>
>
>     -- 
>     Michael Sumner
>     Ordinary Member,  Streets People Love Hobart Association
>     Research Software Engineer
>     Australian Antarctic Division
>     Hobart, Australia
>     0438489030
>     e-mail: mdsumner at gmail.com
>
>
>
> -- 
> Michael Sumner
> Ordinary Member,  Streets People Love Hobart Association
> Research Software Engineer
> Australian Antarctic Division
> Hobart, Australia
> 0438489030
> e-mail: mdsumner at gmail.com
>
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