[CF-metadata] sea water speed and direction?

John Maurer jmaurer at hawaii.edu
Fri Jun 2 15:38:37 MDT 2017

Thanks, Roy. I'm happy with all of your recommendations. If they become
implemented, I would appreciate a notice.

On Thu, Jun 1, 2017 at 11:20 PM, Lowry, Roy K. <rkl at bodc.ac.uk> 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
> enquiries at bodc.ac.uk. Please also use this e-mail if your requirement is
> urgent.
> ------------------------------
> *From:* CF-metadata <cf-metadata-bounces at cgd.ucar.edu> on behalf of John
> Maurer <jmaurer at hawaii.edu>
> *Sent:* 01 June 2017 20:37
> *To:* cf-metadata at cgd.ucar.edu
> *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
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