[gdal-dev] dataset with no driver?

[Even Rouault]

Mike,

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.

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.

Even

Le 22/07/2025 à 05:04, Michael Sumner via gdal-dev a écrit :
> Hi, this is new to me -  casting from MDIM results in a dataset with a 
> null driver:
>
> ds = gdal.Open("../gdrivers/data/small_world.tif")
> ds.GetRasterBand(1).AsMDArray().AsClassicDataset(0,1).GetDriver()
>
> (stupid question:   )
> It makes sense to me for GTiff which has no MDIM capability, but how 
> then does the work get done?
>
> I noticed by going from truly MDIM netcdf to AsClassicDataset() - I'd 
> expected that the NetCDF driver was still involved.
>
> Does this mean we just have to test for null driver and report <none> 
> in that case generally?
>
> Thanks, 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
>
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