[gdal-dev] GTiff bit shuffle compression feature request

[Laurențiu Nicola]

On Fri, Dec 8, 2023, at 21:32, Even Rouault wrote:
> yes, poor wording of mine. I meant that if using PREDICTOR=3, one should compare with FILTER=DELTA. But looking more closely, they are not strictly equivalent. PREDICTOR=3 applies the delta as b[0]-a[0], b[1]-a[1], b[2]-a[2], b[3]-a[3] where a[0...3] and b[0...3] are seen as the 4 byte representation of the float32, whereas FILTER=DELTA does the difference b_float - a_float as floating point. This isn't the same...
> 
https://www.blosc.org/posts/bytedelta-enhance-compression-toolset/ seems to be the equivalent.

> inode allocation

XFS or ZIP?

> extra step to decompress Zarr out of ZIP

Most libraries should be able to read Zarr directly from a ZIP archive.
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