Dear Randy and Jonathan,
I agree with the proposal for a single lightning standard name. Like Jonathan I think it is a good idea to provide as much help as possible in the definition on how best to use the name in conjunction with associated quantities such as coordinates and bounds. To capture all the information and to keep the wording as consistent as possible with existing definitions I suggest modifying it slightly:
"The standard name "lightning radiant energy" means the energy emitted as electromagnetic radiation due to lightning. A coordinate variable of radiation_wavelength, radiation_frequency, or sensor_band_central_wavelength may be specified to indicate that the lightning_radiant_energy applies at specific wavelengths or frequencies. Bounds of the time and spatial coordinates may be specified to indicate the time interval and spatial extent over which the energy is emitted."
The name itself and the units look fine.
Best wishes,
Alison
------
Alison Pamment Tel: +44 1235 778065
NCAS/British Atmospheric Data Centre Email: alison.pamment at stfc.ac.uk<mailto:J.A.Pamment at rl.ac.uk>
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.
From: rhorne at excaliburlabs.com [mailto:rhorne at excaliburlabs.com]
Sent: 14 July 2014 17:29
To: Jonathan Gregory; cf-metadata at cgd.ucar.edu
Subject: Re: [CF-metadata] Proposing Standard Names for Lightning Event, Group and Flash Radiant Energy
Dear Jonathan:
In the interest of making the definition more clear, I would like to propose the following amendment.
Standard_name:
lightning_radiant_energy
Definition:
Radiant energy associated with the emission of electromagnetic radiation due to lightning. Bounds of the time and spatial coordinates associated with the radiant energy may be specified. In addition, the radiant energy's range of wavelengths may be specified by the bounds of a coordinate variable of radiation_wavelength, radiation_frequency, or sensor_band_central_wavelength.
Canonical units: J
very respectfully,
randy
________________________________
From: "Jonathan Gregory" <j.m.gregory at reading.ac.uk<mailto:j.m.gregory at reading.ac.uk>>
Sent: Monday, July 14, 2014 11:57 AM
To: cf-metadata at cgd.ucar.edu<mailto:cf-metadata at cgd.ucar.edu>
Subject: [CF-metadata] Proposing Standard Names for Lightning Event, Group and Flash Radiant Energy
Dear Randy
> Is there a need to specifically call out the need for "time and space bounds" in the definition of this standard name or is it good as is ?
It's correct as it stands, but I thought that it might not be obvious to all
readers that "coordinates" also includes "bounds" and in some cases bounds may
be the more useful part of the coordinate information. If you regard lightning
as monochromatic you might specify a wavelength (rather than bounds), but that
isn't realistic, is it? If it's a single event then maybe it can be regarded
as occurring at an instant of time and a point in space, but in your hierarchy
it appeared that events were grouped, so I suppose there may be a finite time-
interval and spatial extent to be specified.
Best wishes
Jonathan
>
>
>
> On Jul 11, 2014, at 10:52 AM, Jonathan Gregory <j.m.gregory at reading.ac.uk<mailto:j.m.gregory at reading.ac.uk>> wrote:
>
> > Dear Randy and Gary
> >
> >> I am working with Gary on the standard name for lightning radiant energy.
> >>
> >> The original proposed standard names (see below) are inextricably associated with the characteristics of the lightning detection algorithm we have employed, including the notion of flashes, groups, and events. A more general (and useful) way to approach this standard name is to simply call out a lightning radiant energy, and then use one or more of temporal and spatial coordinate variables in conjunction with cell_methods and cell_measures to describe the specific characteristics of the lightning radiant energy data variable. As a result, see the following amended proposal:
> >>
> >> Standard_name:
> >> lightning_radiant_energy
> >>
> >> Definition:
> >> Radiant energy associated with the emission of electromagnetic radiation due to lightning. A coordinate variable of radiation_wavelength, radiation_frequency, or sensor_band_central_wavelength may be specified to indicate that the lightning_radiant_energy applies at specific wavelengths or frequencies.
> >>
> >> Canonical units: J
> >
> > I agree that it should be independent of a particular algorithm, and if this
> > approach works for you, that's good. Thanks. Since it's joules it's extensive
> > in time and space so you would probably need time and space bounds to specify
> > what it applies to. Likewise it would need bounds in radiation frequency or
> > wavelength if it was not the complete spectrum.
> >
> > Best wishes
> >
> > Jonathan
> > _______________________________________________
> > CF-metadata mailing list
> > CF-metadata at cgd.ucar.edu<mailto:CF-metadata at cgd.ucar.edu>
> > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
>
>
> ____________________________________
>
> Randy C. Horne (rhorne at excaliburlabs.com<mailto:rhorne at excaliburlabs.com>)
> Principal Engineer, Excalibur Laboratories Inc.
> voice & fax: (321) 952.5100
> url: http://www.excaliburlabs.com
>
>
>
>
>
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