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<p>Mike,</p>
<p>there are a number of situations where you can get a Dataset not
linked to a driver. Code expecting a Dataset as input should be
robust to it having a null driver.</p>
<p>In your situation, given that small_world.tif is a multiband
dataset, but AsMDArray().AsClassicDataset() returning a single
band one, having GetDriver() report the GTiff driver would not
match the expectation that if Dataset.GetDriver() returns a non
null pointer ,then Dataset.GetDescription() can be passed to
GDALOpen() and returns a dataset that is identical to it.<br>
</p>
<p>Even<br>
</p>
<div class="moz-cite-prefix">Le 22/07/2025 à 05:04, Michael Sumner
via gdal-dev a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:CAAcGz99U-ahb4oMUX2Cp0PYPVSRG_6drr8G_Tfstu0d1y7Fo2Q@mail.gmail.com">
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<div>Hi, this is new to me - casting from MDIM results in a
dataset with a null driver: </div>
<div><br>
</div>
<div>ds = gdal.Open("../gdrivers/data/small_world.tif")</div>
<div>ds.GetRasterBand(1).AsMDArray().AsClassicDataset(0,1).GetDriver()<br>
</div>
<div><br>
</div>
<div>(stupid question: )</div>
<div>It makes sense to me for GTiff which has no MDIM
capability, but how then does the work get done? </div>
<div><br>
</div>
<div>I noticed by going from truly MDIM netcdf to
AsClassicDataset() - I'd expected that the NetCDF driver was
still involved. </div>
<div><br>
</div>
<div>Does this mean we just have to test for null driver and
report <none> in that case generally? </div>
<div><br>
</div>
<div>Thanks, Mike</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<span class="gmail_signature_prefix">-- </span><br>
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data-smartmail="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>
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<br>
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