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In NPL's Good Pratice Guidance for underwater noise recordings (https://www.researchgate.net/publication/263229365_Good_Practice_Guide_No_133_Underwater_Noise_Measurement)

The underwater noise guideline (p33) states:

"To avoid degradation of the data quality, the data format used to store the data should ideally be lossless (no data compression). If data compression formats are used in order to increase the storage capacity (and thereby the recording duration), the effect on the data quality should be known."

This is nonsense to me as "lossless" compression is lossless, no information is lost. Therefore specifying, in brackets, that this means "no compression" is not logical (and I argue, wrong).

I assume they meant "(no lossy data compression)".

Can you confirm that I'm not the only one thinking the guidance has got this wrong?

2023/03/01: I queried the authors: "The main point is that the data should be stored with no loss of integrity. Some data compression techniques can recover the original data without loss, and this is perfectly fine."

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  • $\begingroup$ I agree they most probably meant 'lossy' compression $\endgroup$
    – Noil
    Commented Feb 16, 2023 at 16:13

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Agree, the sentence makes no sense and is most likely an oversight by authors and reviewers: "lossless compression" is "lossless" AND "compression", so you cannot ask for lossless data representation and discourage compression without being more specific.

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