Thanks Chris,
An excellent point, and the word 'vertical' should be added to the definitions. I was wondering about including highest one-third in the Hs definition, but there are alternatives and I tried to find an understandable form of words covering all and failed dismally. Maybe something like:? Significant wave height is a statistic computed from wave measurements collected during an observation period that approximates to the wave height that would be recorded visually by a human observer during that observation period. This corresponds to the average height of the highest one third of the waves. Cheers, Roy. Please note that I partially retired on 01/11/2015. I am now only working 7.5 hours a week and can only guarantee e-mail response on Wednesdays, my day in the office. All vocabulary queries should be sent to [email protected]. Please also use this e-mail if your requirement is urgent. ________________________________ From: CF-metadata <[email protected]> on behalf of Chris Barker <[email protected]> Sent: 04 May 2016 22:46 To: Elodie Fernandez Cc: [email protected]; [email protected] Subject: Re: [CF-metadata] Waves just a little note: - sea_surface_wave_significant_height Wave height is defined as the distance from a wave trough to the following wave crest. NOTE: the is the VERTICAL distance -- difference in elevation between the bottom of a trough and top of the crest. this wording sounds a lot like a horizontal distance -- a totally different concept. Anyone that words with waves knows this, of course, but if we're going to have definitpons they should be clear to lay people, too. Significant wave height is a statistic computed from wave measurements collected during an observation period that approximates to the wave height that would be recorded visually by a human observer during that observation period. this is a bit tricky -- yes, that's what significant wave height means, but it is often (usually?) used now to mean the height of the highest third, perhaps that goes in the long name, but I think it should probably be in the description, as that's how it's actually measured/computed these days. -CHB -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/OR&R (206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception [email protected]<mailto:[email protected]> ________________________________ 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. ________________________________
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