Thanks, Roy. I'm happy with all of your recommendations. If they become implemented, I would appreciate a notice. Aloha, John
On Thu, Jun 1, 2017 at 11:20 PM, Lowry, Roy K. <[email protected]> wrote: > Dear John, > > > That's a good point about the ambiguity of 'direction_of_sea_water_velocity'. > As an observational oceanographer its built into my core program that > 'direction' means 'direction_to' for currents. I'm not alone here, which is > probably how the ambiguity got overlooked when the Standard Name was set > up. My suggestion for corrective action would be to alias ' > direction_of_sea_water_velocity' to 'sea_water_to_direction' whilst > adding a new Standard Name 'sea_water_from_direction'. I prefer your > suggestions here to the more verbose alternatives such as 'to_ > direction_of_sea_water_velocity'. > > > You could then use 'sea_water_speed' and 'sea_water_to_direction' for your > data as polar co-ordinates. You could also consider transforming to > cartesian co-ordinates and using 'eastward_sea_water_velocity' and > 'northward_sea_water_velocity' for the Standard Names. > > > I am opposed to the creation of separate 'surface' Standard Names unless > there is a case that the measured phenomenon is different. If you read the > definition of 'surface_eastward_sea_water_velocity' you will see that it > represents a different phenomenon to 'eastward_sea_water_velocity' because > it allows for the boundary between water body and atmosphere being either > water or ice. Consequently, unless there was a specific need to specify a > water-or-ice surface motion in terms of polar co-ordinates I would recommen > against adding the new 'surface' names that you suggest. > > > 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 John > Maurer <[email protected]> > *Sent:* 01 June 2017 20:37 > *To:* [email protected] > *Subject:* [CF-metadata] sea water speed and direction? > > Please provide guidance on which CF Standard Names to use for sea water > surface velocity. We will soon have a new buoy with an acoustic current > meter (ACM) that records speed (m/s) and direction (degrees) of the surface > currents. Are these the recommended CF Standard Names to attribute for > these measurement parameters?: > > - sea_water_speed > - direction_of_sea_water_velocity > > The latter does not indicate the "from" or "to" direction of the variable, > which concerns me. I am used to applying "wind_from_direction" or > "wind_to_direction" for wind measurements to solve this ambiguity. Thoughts > on replacing this with "sea_water_from_direction" and > "sea_water_to_direction"? > > Also, I note there are CF Standard Names that exist for > "surface_eastward_sea_water_velocity" and > "surface_northward_sea_water_velocity". > I would expect and recommend the addition of the following surface names: > > - surface_sea_water_speed > - surface_sea_water_from_direction > - surface_sea_water_to_direction > > Please advise. > Thanks!, > John Maurer > Data System Engineer > Pacific Islands Ocean Observing System (PacIOOS) > University of Hawaii at Manoa > ------------------------------ > 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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