Even Rouault wrote:
What raster format would you suggest then?

I mean, based on those requirements:

- Multiband;
- Large files;
- Good performance *reading* the data in pixel space. Not the "band as
usual" ;)

How about rotating the axis so:
stored x axis = data time axis,
stored y axis = data x axis,
stored z (band) axis = data y axis. For your 5000x2500 with 312 bands example this would result in 312x5000 and 2500 bands tiff file. Reading all 312 values for some point would mean reading a single row (scanline) from a single band, a very fast operation.
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