[gdal-dev] remote png and aux file

[Michael Sumner]

Ah, I see - thanks!  I hadn't understood that properly.

cheers, Mike


On Fri, Oct 31, 2025 at 3:35 PM Even Rouault <even.rouault at spatialys.com>
wrote:

> 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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>
> -- http://www.spatialys.com
> My software is free, but my time generally not.
>
>

-- 
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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