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<p>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 .<br>
</p>
<div class="moz-cite-prefix">Le 31/10/2025 à 05:26, Michael Sumner
via gdal-dev a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:CAAcGz98fzu5xdBDP9q8vtSeLh8GMdSoDtWQNNt0Z3H9c7HpjaQ@mail.gmail.com">
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<div>> Should it be picking that up, or is that too much to
ask with the /vsi* protocol? </div>
<div><br>
</div>
I meant to say: '
Should it be picking that up, or is that too much to ask
*without* the /vsi* protocol?'</div>
<br>
<div class="gmail_quote gmail_quote_container">
<div dir="ltr" class="gmail_attr">On Fri, Oct 31, 2025 at
3:21 PM Michael Sumner <<a href="mailto:mdsumner@gmail.com"
moz-do-not-send="true" class="moz-txt-link-freetext">mdsumner@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<div>I've noticed that a sidecar .aux.xml for a PNG is not
picked up on a bare url: </div>
<div><br>
</div>
<div> gdal.Open("<a
href="https://projects.pawsey.org.au/geotar0/sentinel-2-c1-l2a/2023/01/03/Macquarie_Island_Station_2023-01-03.png"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">https://projects.pawsey.org.au/geotar0/sentinel-2-c1-l2a/2023/01/03/Macquarie_Island_Station_2023-01-03.png</a>").GetGeoTransform()<br>
(0.0, 1.0, 0.0, 0.0, 0.0, 1.0)</div>
<div><br>
gdal.Open("/vsicurl/<a
href="https://projects.pawsey.org.au/geotar0/sentinel-2-c1-l2a/2023/01/03/Macquarie_Island_Station_2023-01-03.png"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">https://projects.pawsey.org.au/geotar0/sentinel-2-c1-l2a/2023/01/03/Macquarie_Island_Station_2023-01-03.png</a>").GetGeoTransform()<br>
(-3000.0, 10.0, 0.0, 3000.0, 0.0, -10.0)<br>
</div>
<div><br>
</div>
<div>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*). </div>
<div><br>
</div>
<div>Cheers, Mike</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<span class="gmail_signature_prefix">-- </span><br>
<div dir="ltr" class="gmail_signature">
<div dir="ltr">
<div dir="ltr" style="color:rgb(34,34,34)">
<div dir="ltr">Michael Sumner</div>
<div dir="ltr">Ordinary Member, Streets People Love
Hobart Association<br>
Research Software Engineer<br>
Australian Antarctic Division<br>
Hobart, Australia</div>
<div dir="ltr">0438489030<br>
e-mail: <a href="mailto:mdsumner@gmail.com"
style="color:rgb(17,85,204)" target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">mdsumner@gmail.com</a></div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<div><br clear="all">
</div>
<div><br>
</div>
<span class="gmail_signature_prefix">-- </span><br>
<div dir="ltr" class="gmail_signature">
<div dir="ltr">
<div dir="ltr" style="color:rgb(34,34,34)">
<div dir="ltr">Michael Sumner</div>
<div dir="ltr">Ordinary Member, Streets People Love Hobart
Association<br>
Research Software Engineer<br>
Australian Antarctic Division<br>
Hobart, Australia</div>
<div dir="ltr">0438489030<br>
e-mail: <a href="mailto:mdsumner@gmail.com"
style="color:rgb(17,85,204)" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">mdsumner@gmail.com</a></div>
</div>
</div>
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<br>
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</blockquote>
<pre class="moz-signature" cols="72">--
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My software is free, but my time generally not.</pre>
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