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 [email protected] > On Nov 4, 2018, at 09:03, Jonathan Gregory <[email protected]> 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 > <[email protected]> —— > > Begin forwarded message: > > From: "Moroni, David F (398M)" <[email protected]> > Subject: Re: [CF-metadata] [cf-satellite] > normalized_radar_backscatter_coefficient > Date: August 8, 2014 at 3:10:50 PM PDT > To: John Graybeal <[email protected]>, > "[email protected]" <[email protected]> > Cc: "Weiss, Barry H (398B)" <[email protected]>, Jonathan Gregory > <[email protected]>, "[email protected]" > <[email protected]>, CF Metadata List <[email protected]> > > 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 <[email protected] > <mailto:[email protected]>> > Date: Friday, August 8, 2014 10:57 AM > To: "[email protected] <mailto:[email protected]>" > <[email protected] <mailto:[email protected]>> > Cc: "Weiss, Barry H (398B)" <[email protected] > <mailto:[email protected]>>, David F Moroni > <[email protected] <mailto:[email protected]>>, Jonathan > Gregory <[email protected] <mailto:[email protected]>>, > "[email protected] <mailto:[email protected]>" > <[email protected] <mailto:[email protected]>>, CF > Metadata List <[email protected] <mailto:[email protected]>> > 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, [email protected] >> <mailto:[email protected]> wrote: >> >>> Dear Barry and David: >>> >>> For udunits support, send an email to [email protected] >>> <mailto:[email protected]>. >>> >>> >>> >>> very respectfully, >>> >>> randy >>> >>> >>> >>> From: "Weiss, Barry H (398B)" <[email protected] >>> <mailto:[email protected]>> >>> Sent: Thursday, August 07, 2014 10:06 AM >>> To: "Moroni, David F (398M)" <[email protected] >>> <mailto:[email protected]>>, "Jonathan Gregory" >>> <[email protected] <mailto:[email protected]>> >>> Cc: "Niedfeldt, John C (398M-Affiliate)" <[email protected] >>> <mailto:[email protected]>>, "CF Metadata List" >>> <[email protected] <mailto:[email protected]>>, "John >>> Graybeal" <[email protected] >>> <mailto:[email protected]>>, "[email protected] >>> <mailto:[email protected]>" <[email protected] >>> <mailto:[email protected]>> >>> 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)" <[email protected] >>> <mailto:[email protected]>> >>> 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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