Hello all, 

I have a question on scope of the GTI driver, which I think provides a really 
nice capability for a lightweight single file raster catalog!
 
One very common pattern I use and often see others using is `gdalbuildvrt 
-separate stack.vrt *.tif` for approximately-coincident satellite images over 
time. I was hoping to use the GTI driver for this, but as far as I can tell, it 
must return a 2D raster. Am I missing a setting to treat input features as 
separate bands?  Or is this just out of scope for GTI and instead adding this 
3rd ‘band’ or ‘time’ dimension is better suited for a custom script using the 
multidimensional raster API?

Cheers,
Scott
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