Hi John, What about pyranometers that measure light intensity in terms of energy (by determining black body temperature change) as opposed to determining the quantity of photons?
Cheers, Roy. ________________________________________ From: John Graybeal [jbgrayb...@mindspring.com] Sent: 15 January 2011 02:23 To: Lowry, Roy K. Cc: Miles Jordan; cf-metadata@cgd.ucar.edu; Jonathan Gregory Subject: Re: [CF-metadata] Ambient light [Sec=Unclassified] Is ''A photometric measurement of' a critical part of the definition? I can imagine another magical technology that measures the intensity of the light in some other way. Well, I *can't* imagine the technology, but you know what I mean.... john On Jan 12, 2011, at 00:36, Lowry, Roy K. wrote: > Thanks Miles, > > Having read around a bit more I agree that the term luminance implies visible > (ie wavelengths detected by the human eye) light and so 'luminance_in_air' > would work, providing a suitable definition is included. > > My straw man proposal for a definition would be 'A photometric measurement of > the intensity of visible light that passes through or is emitted from a given > area'. Anyone anything better? > > Cheers, Roy. > > -----Original Message----- > From: Miles Jordan [mailto:miles.jor...@aad.gov.au] > Sent: 11 January 2011 23:56 > To: Lowry, Roy K. > Cc: Jonathan Gregory; cf-metadata@cgd.ucar.edu > Subject: RE: [CF-metadata] Ambient light [Sec=Unclassified] > > Thanks for your patience. > > I've asked what people think, and we have come up with a couple: > surface_diffuse_luminance_of_shortwave_radiation_in_air or just > luminance_of_shortwave_radiation_in_air. > > I don't think you can have luminance without diffuse reflection and I also > don't think it can be a measurement of any other wavelength so it could be as > simple as luminance_in_air. But I'll leave it up to the list to decide. > > Regards, > > Miles > > > Lowry, Roy K. wrote: >> Hi Miles, >> >> I would confirm with somebody who undestands the data before making >> any decisions. >> >> Cheers, Roy. >> >> ________________________________________ >> From: Miles Jordan [miles.jor...@aad.gov.au] >> Sent: 07 January 2011 12:07 >> To: Lowry, Roy K. >> Cc: Jonathan Gregory; cf-metadata@cgd.ucar.edu >> Subject: Re: [CF-metadata] Ambient light [Sec=Unclassified] >> >> Quite possibly. I will have to take your recommendation on that as I >> am more on the software development side of things. Or shall I ask the >> people from my end that understand the data better? >> >> Sounds ok to me though. >> >> Regards, >> >> Miles Jordan >> mi...@milesjordan.com >> +61 424 879 668 >> >> On 07/01/2011, at 8:35 PM, "Lowry, Roy K." <r...@bodc.ac.uk> wrote: >> >>> Hi Miles, >>> >>> Should there be anything in the Standard Name to specify the >> wavelengths of light detected in the measurement e.g. >> luminous_intensity_of_shortwave_radiation_in air? >>> >>> Cheers, Roy. >>> >>> ________________________________________ >>> From: cf-metadata-boun...@cgd.ucar.edu >>> [cf-metadata-boun...@cgd.ucar.edu] On Behalf Of Miles Jordan >>> [miles.jor...@aad.gov.au] >>> Sent: 07 January 2011 00:41 >>> To: 'Jonathan Gregory' >>> Cc: cf-metadata@cgd.ucar.edu >>> Subject: Re: [CF-metadata] Ambient light [Sec=Unclassified] >>> >>> Jonathan Gregory wrote: >>>> Dear Miles >>>> >>>>> Just wondering if there is a standard name that I should use for >>>> ambient light in air measured in candles; I can't see one for ambient >>>> light, luminous intensity, or anything else I can think of. >>>> >>>> I don't think there is at present. Is "candle" the same as the SI >>>> unit "candela"? Please propose a standard name if you would like >> to. >>> >>> Yes, candela == candle. May I suggest luminous_intensity_in_air? >>> >>> Regards, >>> >>> Miles >>> >>> > > > > ___________________________________________________________________________ > > Australian Antarctic Division - Commonwealth of Australia > IMPORTANT: This transmission is intended for the addressee only. If you are > not the > intended recipient, you are notified that use or dissemination of this > communication is > strictly prohibited by Commonwealth law. If you have received this > transmission in error, > please notify the sender immediately by e-mail or by telephoning +61 3 6232 > 3209 and > DELETE the message. > Visit our web site at http://www.antarctica.gov.au/ > ___________________________________________________________________________ > > -- > This message (and any attachments) is for the recipient only. NERC > is subject to the Freedom of Information Act 2000 and the contents > of this email and any reply you make may be disclosed by NERC unless > it is exempt from release under the Act. Any material supplied to > NERC may be stored in an electronic records management system. > _______________________________________________ > CF-metadata mailing list > CF-metadata@cgd.ucar.edu > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata John Graybeal <mailto:jgrayb...@ucsd.edu> phone: 858-534-2162 System Development Manager Ocean Observatories Initiative Cyberinfrastructure Project: http://ci.oceanobservatories.org Marine Metadata Interoperability Project: http://marinemetadata.org _______________________________________________ CF-metadata mailing list CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
