[gdal-dev] Multidimensional raster support in GDAL

[Ari Jolma]

Even Rouault kirjoitti 26.10.2017 klo 20:17:
>
> >
>
> > Would it be possible to keep X,Y as it is and add support for
>
> > multidimensional data as an extension?
>
> That could be indeed an option if we are sure that the 2 first 
> dimensions are X and Y, and we want only to slice higher dimensionnal 
> variables to X,Y.
>

Assuming we have a X,Y,Z,T dataset of sea temperatures (Z is depth), we 
may want to warp it from projection A to B and then select a location 
and look a Z,T image from that location. Warping would work on X,Y and 
compute the Z,T as an extension what it now does for the pixel values 
(possibly multiple bands). I could imagine that the user would want to 
use GDAL for slicing the Z,T into an image - GDAL can write image files, 
so why not?

So perhaps the assumption for only slicing to X,Y is not ok.

> So instead of having a general purpose indexing mechanism as I 
> scetched initially an option would be to expose the extra 
> dimensions/axis, their bounds. The user could set the values at which 
> to set the values at which those extra dimensions must be considered, 
> so as to get a fully constrainted X,Y indexed field.
>
> The main advantage of this is that it would have presumably no impact 
> on 2D-only drivers.
>

I assume that would be very good from the point of view of actual 
feasibility of the whole project.

Ari

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