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 <cf-metadata-bounces at cgd.ucar.edu> on behalf of Jim Biard <jbiard at cicsnc.org>
Sent: 03 October 2018 20:38
To: cf-metadata at cgd.ucar.edu
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: alison.pamment at stfc.ac.uk<mailto:alison.pamment at stfc.ac.uk>
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.
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