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titleRecommendation: DIWG-R15

We recommend adhering to the CF convention's guidance on the use of the units attribute with the following clarifications:

  • Unitless (dimensionless in the physical sense) property of the data in a variable is indicated by the lack of a units attribute, unless:
    • appropriate physical units do exist;
    • use of dimensionless units identifiers is common practice in the target user community.
  • Values of the units attribute should be supported by the UDUNITS-2 library.
  • A variable used in any context other than data storage should never have the units attribute.

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