Just as an aside (or maybe not), the udunits support list has been asked before to include dB, and I understood that they had (I think I actually saw it, but can?t find written confirmation). So it wouldn?t surprise me if the library included dB.
In case it?s useful I pasted in a bit of the old thread below.
john
---------------------------------------
John Graybeal
jbgraybeal at mindspring.com
> On Nov 4, 2018, at 09:03, Jonathan Gregory <j.m.gregory at reading.ac.uk> wrote:
>
> Dear Martin
>
> Your points are good ones and have been raised before. More than once we have
> talked about maintaining a CF version of the udunits definition to include dB
> and sverdrup, or ask udunits to add them (if they're not there). dB is a dimen-
> sionless unit, equivalent to 1. I suggest that dBZ should be changed to dB,
> as I don't think we ought to have several of them. I believe that the default
> reference levels are mostly conventional and stated in the definitions of the
> standard name, as you say. They can be overridden by supplying a size-one or
> scalar coordinate variable. You have previously suggested an xml table to
> contain more information about the definition of standard names, haven't you?
> It seems to me that an arrangement like that would be the right place to store
> the default reference levels and scale factor in a machine-readable way.
>
> Best wishes
>
> Jonathan
>
> ----- Forwarded message from Martin Juckes - UKRI STFC <martin.juckes at stfc.ac.uk> ??
>
> Begin forwarded message:
>
> From: "Moroni, David F (398M)" <David.F.Moroni at jpl.nasa.gov>
> Subject: Re: [CF-metadata] [cf-satellite] normalized_radar_backscatter_coefficient
> Date: August 8, 2014 at 3:10:50 PM PDT
> To: John Graybeal <john.graybeal at marinexplore.com>, "rhorne at excaliburlabs.com" <rhorne at excaliburlabs.com>
> Cc: "Weiss, Barry H (398B)" <barry.h.weiss at jpl.nasa.gov>, Jonathan Gregory <j.m.gregory at reading.ac.uk>, "cf-satellite at unidata.ucar.edu" <cf-satellite at unidata.ucar.edu>, CF Metadata List <cf-metadata at cgd.ucar.edu>
>
> Hi John,
>
> Thanks for providing the email link. I've already emailed Unidata and they are processing my request to include dB within UDUNITS.
>
> Cheers,
> David
>
> From: John Graybeal <john.graybeal at marinexplore.com <mailto:john.graybeal at marinexplore.com>>
> Date: Friday, August 8, 2014 10:57 AM
> To: "rhorne at excaliburlabs.com <mailto:rhorne at excaliburlabs.com>" <rhorne at excaliburlabs.com <mailto:rhorne at excaliburlabs.com>>
> Cc: "Weiss, Barry H (398B)" <barry.h.weiss at jpl.nasa.gov <mailto:barry.h.weiss at jpl.nasa.gov>>, David F Moroni <David.F.Moroni at jpl.nasa.gov <mailto:David.F.Moroni at jpl.nasa.gov>>, Jonathan Gregory <j.m.gregory at reading.ac.uk <mailto:j.m.gregory at reading.ac.uk>>, "cf-satellite at unidata.ucar.edu <mailto:cf-satellite at unidata.ucar.edu>" <cf-satellite at unidata.ucar.edu <mailto:cf-satellite at unidata.ucar.edu>>, CF Metadata List <cf-metadata at cgd.ucar.edu <mailto:cf-metadata at cgd.ucar.edu>>
> Subject: Re: [CF-metadata] [cf-satellite] normalized_radar_backscatter_coefficient
>
>> This request has now been made by me of UDUNITS on general principle, but I think individuals could also express their desire as a way to move the ball forward.
>>
>> John
>>
>> On Aug 7, 2014, at 07:57, rhorne at excaliburlabs.com <mailto:rhorne at excaliburlabs.com> wrote:
>>
>>> Dear Barry and David:
>>>
>>> For udunits support, send an email to support-udunits at unidata.ucar.edu <mailto:support-udunits at unidata.ucar.edu>.
>>>
>>>
>>>
>>> very respectfully,
>>>
>>> randy
>>>
>>>
>>>
>>> From: "Weiss, Barry H (398B)" <barry.h.weiss at jpl.nasa.gov <mailto:barry.h.weiss at jpl.nasa.gov>>
>>> Sent: Thursday, August 07, 2014 10:06 AM
>>> To: "Moroni, David F (398M)" <David.F.Moroni at jpl.nasa.gov <mailto:David.F.Moroni at jpl.nasa.gov>>, "Jonathan Gregory" <j.m.gregory at reading.ac.uk <mailto:j.m.gregory at reading.ac.uk>>
>>> Cc: "Niedfeldt, John C (398M-Affiliate)" <John.C.Niedfeldt at jpl.nasa.gov <mailto:John.C.Niedfeldt at jpl.nasa.gov>>, "CF Metadata List" <cf-metadata at cgd.ucar.edu <mailto:cf-metadata at cgd.ucar.edu>>, "John Graybeal" <john.graybeal at marinexplore.com <mailto:john.graybeal at marinexplore.com>>, "cf-satellite at unidata.ucar.edu <mailto:cf-satellite at unidata.ucar.edu>" <cf-satellite at unidata.ucar.edu <mailto:cf-satellite at unidata.ucar.edu>>
>>> Subject: Re: [cf-satellite] [CF-metadata] normalized_radar_backscatter_coefficient
>>>
>>> Jonathan,
>>>
>>> As the data product engineer for the SMAP project, I second David's
>>> request.
>>>
>>> We are attempting to employ CF metadata in our products. This is not a
>>> challenge at level 2 and above where our products provide geophysical
>>> measure, but is a challenge at level 1, where our products provide
>>> instrument measurements.
>>>
>>> Please consider inclusion of dB units. That should include dB based on
>>> unit less measure, as well as dB relative to watts and volts.
>>>
>>> Thanks and Regards,
>>>
>>> Barry
>>>
>>>
>>> On 8/6/14 7:49 PM, "Moroni, David F (398M)" <David.F.Moroni at jpl.nasa.gov <mailto:David.F.Moroni at jpl.nasa.gov>>
>>> wrote:
>>>
>>> >Hi Jonathan,
>>> >
>>> >Just as follow up from my last email, I noticed an online email exchange
>>> >where you had responded to a request to use units of dB (decibels) even
>>> >though it is not currently in the udunits database:
>>> >http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2013/056572.html <http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2013/056572.html>
>>> >
>>> >We also agree it would be wise to include dB in the udunits database, and
>>> >we will be applying these units for our scatterometer datasets.
>>> >
>>> >We hope to see this incorporated in the near future.
>>> >
>>> >Thanks again for your considerations.
>>> >
>>> >Cheers,
>>> >David
>>> >
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