Mark,
Logarithmic units need a reference level in order to support numerical
conversions; "dB" doesn't have one. A decibel unit with a one milliwatt
reference level would be "0.1 lg(re 1 mW)".
Regards,
Steven Emmerson
Software Developer
Unidata Program Center
University Corporation for Atmospheric Research
On Wed, May 29, 2013 at 4:31 AM, Hedley, Mark
<mark.hedley at metoffice.gov.uk>wrote:
> Hello CF
>
> A few standard names:
>
> sound_intensity_level_*
> sound_pressure_level_*
>
> have a stated canonical units of dB. I think valid units in CF are
> defined by udunits2.
>
> My install of udunits (udunits2-2.1.24) does not recognise dB as a valid
> units string.
>
> Is this an issue for the CF standard names maintainers or for the udunits
> maintainers?
>
> thank you
> mark
>
>
> _______________________________________________
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> CF-metadata at cgd.ucar.edu
> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
>
>
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