[gdal-dev] Stacks versus mosaics with GTI Driver

[Even Rouault]

Hi,

The GTI driver indeed doesn't support -separate type of datasets. It 
would mean it would have to ingest the whole "index" at opening, so 
apart from a reduction in size of the index compared to VRT, you'd 
likely have little benefits. If you have really a lot of bands (like 
100k or more), GDAL will struggle memory wise and CPU wise at some 
point. Using a 3D multidim array will be a better model then.

(Your question is slightly related, but not completely, to 
https://github.com/OSGeo/gdal/issues/11321 which is something 
in-between, where one would want to group together a number of 
single-band assets per feature as multi-band tiles)

Even

Le 26/11/2024 à 13:07, Scott Henderson via gdal-dev a écrit :
> 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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