Jonathan,
We thought about using "1', but Paragraph 3.1 in CF 1.6 states "1" can be used for fractions or parts of a whole. Reflectance factor is neither a fraction nor part of a whole so I think the better option is Jim's suggestion - no units attribute, unless we're missing something about the uses of "1".
Mike
-----Original Message-----
From: cf-metadata-bounces at cgd.ucar.edu [mailto:cf-metadata-bounces at cgd.ucar.edu] On Behalf Of Jonathan Gregory
Sent: Monday, May 14, 2012 9:51 AM
To: cf-metadata at cgd.ucar.edu
Subject: Re: [CF-metadata] Reflectance channel satellite imagery units
Dear Mike
> > We?re producing a satellite imagery product where the pixel values are ?reflectance factors? which is unitless.
> >
> > What unit definition should we be using to comply with CF?
Jim is correct that you can omit the units attribute. It is also permissible
and may be more informative to code units="1". A dimensionless number is a
legal udunit.
Best wishes
Jonathan
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Received on Mon May 14 2012 - 08:00:08 BST
