Dear Jim,
Currents are measured by attaching one or more current meters along a rope suspended in the water body known as the mooring. Established practice is to call the current meters the instruments and the mooring the platform. As current meters have developed, some have been fitted with orientation sensors. Nan's concern, which I share, was to be sure that orientation data from current meters (which everybody in oceanography I know thinks of as instruments) were covered by the new Standard Name definitions. There are other examples I can think of where oceanographic equipment commonly regarded as instruments measure orientation and/or motion relative to a local CRS. Cheers, Roy I have now retired but will continue to be active through an Emeritus Fellowship using this e-mail address. ________________________________ From: CF-metadata <[email protected]> on behalf of Jim Biard <[email protected]> Sent: 03 October 2018 20:38 To: [email protected] Subject: Re: [CF-metadata] Platform Heave Alison, It all looks good to me. I must confess that I didn't give the definitions a super-careful reading. I have a question, but I don't want it to derail anything. I'd just like to understand the thought. We have included instrument as a type of platform per Nan's request, but in the areas I have worked in an instrument is always mounted on something, so I don't consider it to be an example of a platform. I'd consider the thing the instrument is mounted on as the platform. Is it common in other disciplines to think of instruments as free-standing (or floating or flying)? Grace and peace, Jim On 10/3/18 1:10 PM, Alison Pamment - UKRI STFC wrote: Dear Jim, Roy, Nan, Jonathan, et al., I have drawn together what I hope is the final list for the platform names. We seem to be agreed on the need to have triplets of names to cope with opposite sign conventions and the case where the sign convention is unknown. I've followed Roy's comment http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2018/020540.html regarding cross-referencing in the definitions, i.e. adding the statement to only choose the unsigned names if the convention is truly unknown. I plan to create aliases for some of the existing names as follows: platform_yaw_angle -> platform_yaw platform_pictch_angle -> platform_pitch platform_roll_angle > platform_roll to make them consistent with the new names. In addition to Jim's 12th September proposals (http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2018/020513.html), new names for platform_sway, platform_sway_rate, platform_surge and platform_surge_rate are needed to provide complete triplets of names for all the quantities. The definitions of the new quantities are all based on Jim's text, with the 'platform' description moved to the end. 'Instrument' has been added to the list of platforms as I think this was requested by Nan earlier in the discussion. (I think we can regard an 'instrument' as a way to mount one or more 'sensors'). The definitions of all existing platform names will be updated for consistency. On a grammatical point, I noticed that the definitions of yaw/pitch/roll/surge rate in Jim's message all said "Yaw/pitch/roll/surge rate *might not* include changes to the "at rest" position of the platform ..." whereas the definitions of sway/heave rate said "Sway/heave rate *may not* include changes to the "at rest" position of the platform ...". I have changed all the definitions to say "might not" instead of "may not" as I think the latter could sound like we are prohibiting the inclusion of changes to the "at rest" position, which I don't think is the intention. Please correct me if this is wrong! I have added all the names into the standard names editor: http://cfeditor.ceda.ac.uk/proposals/1?status=active&namefilter=platform&proposerfilter=&descfilter=&unitfilter=&yearfilter=&commentfilter=&filter+and+display=Filter. To save copying and pasting all the text into this message, please use the link to check through the full list. N.B. You can refine the filters to view smaller subsets of names together, e.g., 'platform_sway'. If no objections or suggestions for further changes are received, the names will be accepted in their current form and published on 15th October. Best wishes, Alison ------ Alison Pamment Tel: +44 1235 778065 NCAS/Centre for Environmental Data Archival Email: [email protected]<mailto:[email protected]> STFC Rutherford Appleton Laboratory R25, 2.22 Harwell Oxford, Didcot, OX11 0QX, U.K. _______________________________________________ CF-metadata mailing list [email protected]<mailto:[email protected]> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata -- [CICS-NC] <http://www.cicsnc.org/> Visit us on Facebook <http://www.facebook.com/cicsnc> Jim Biard Research Scholar Cooperative Institute for Climate and Satellites NC <http://cicsnc.org/> North Carolina State University <http://ncsu.edu/> NOAA National Centers for Environmental Information <http://ncdc.noaa.gov/> formerly NOAA’s National Climatic Data Center 151 Patton Ave, Asheville, NC 28801 e: [email protected]<mailto:[email protected]> o: +1 828 271 4900 Connect with us on Facebook for climate<https://www.facebook.com/NOAANCEIclimate> and ocean and geophysics<https://www.facebook.com/NOAANCEIoceangeo> information, and follow us on Twitter at @NOAANCEIclimate<https://twitter.com/NOAANCEIclimate> and @NOAANCEIocngeo<https://twitter.com/NOAANCEIocngeo>. ________________________________ 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 [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
