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p.MsoNormal,p.MsoNoSpacing{margin:0}</style></head><body><div style="font-family:Arial;">On Fri, Dec 8, 2023, at 21:32, Even Rouault wrote:<br></div><blockquote type="cite" id="qt" style=""><p>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...<br></p></blockquote><div style="font-family:Arial;"><a href="https://www.blosc.org/posts/bytedelta-enhance-compression-toolset/">https://www.blosc.org/posts/bytedelta-enhance-compression-toolset/</a> seems to be the equivalent.<br></div><div style="font-family:Arial;"><br></div><div style="font-family:Arial;">> inode allocation<br></div><div style="font-family:Arial;"><br></div><div style="font-family:Arial;">XFS or ZIP?<br></div><div style="font-family:Arial;"><br></div><div style="font-family:Arial;">> extra step to decompress Zarr out of ZIP<br></div><div style="font-family:Arial;"><br></div><div style="font-family:Arial;">Most libraries should be able to read Zarr directly from a ZIP archive.<br></div><div style="font-family:Arial;"><br></div></body></html>