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BODC parameter semantic model parameter entity names
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NTR: Request for S06 Size category (BODCNVS-989) #28

Closed nvsvocabs closed 3 years ago

nvsvocabs commented 3 years ago

Required

Term name (PrefLabel)

Size category

Definition

Terms used in the contruction of a complex variable description when the objects of interest need to be grouped according to their size. These categories may be expressed as text (e.g. "small", "large") or size intervals (e.g. ">200um", "20-20um"). It is recommended that the result be constrained by a controlled vocabulary such as [S09](http://vocab.nerc.ac.uk/collection/S09/current/) for biological objects.

Optional

Sources/references

https://github.com/nvs-vocabs/P01/issues/65

gwemon commented 3 years ago

Hi @danibodc could you add this one in S06 please? Thank you.

danibodc commented 3 years ago

Hi @gwemon

I have now created this S06 term:

S0600270 Size category

Terms used in the construction of a complex variable description when the objects of interest need to be grouped according to their size. These categories may be expressed as text (e.g. "small", "large") or size intervals (e.g. ">200um", "20-20um"). It is recommended that the result be constrained by a controlled vocabulary such as [S09] (http://vocab.nerc.ac.uk/collection/S09/current/) for biological objects.

dr-shorthair commented 3 years ago

What is the relationship of this to http://vocab.nerc.ac.uk/collection/S06/current/S0600192/ and http://vocab.nerc.ac.uk/collection/S06/current/S0600089/ ??

gwemon commented 3 years ago

@dr-shorthair the new term is a nominal property category; that means that any P01 code built with this S06 property would have a character string result. The S06 concept "Size class" clearly states that it is "a size interval defined as a character string indicating the lower size limit, the upper size limit and the unit of measurement of the upper and lower limits."; so it would not accept text categories like e.g. "small"/"medium"/"large" terms that are often used in e.g. plankton samples counted using optical microscopy. Same for the other S06 concept "Grain-size". "Grain-size" is a legacy term somewhat, inherited from the old version of the P01 parameter dictionary. I have often wondered if it should not be replaced by "Equivalent Spherical Diameter". This might be something worth discussing with sedimentologists at some stage and also comparing with the way other terminologies have defined or labelled these concepts.

dr-shorthair commented 3 years ago

OK - should 'grain-size' be seen as a specialization of the new term? Should 'size-class' be a generalization??

gwemon commented 3 years ago

I see the new term as the more generic term of all 3, and size-class and "grain-size" may be seen as specialisations with the difference that "grain-size", unlike the other 2, is a quantity whose result is a numerical value that needs to be linked to a unit unlike the other 2 for which the result will be text (preferably constrained by a controlled vocabulary but it could also be free text, depending on how we define the P01 code).