> Date: Fri, 30 Jul 2010 10:05:33 -0400
> From: Nan Galbraith <ngalbraith at whoi.edu>
> Subject: Re: [CF-metadata] new standard_name:
> surface_sea_water_velocity
> To: beate.geyer at gkss.de
> Cc: cf-metadata at cgd.ucar.edu
> Message-ID: <4C52DC2D.2000307 at whoi.edu>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>
> > these both variables already exist:
> > surface_eastward_sea_water_velocity and
> > surface_northward_sea_water_velocity
> >
> > we are in the need of
> > surface_sea_water_velocity
> >
>
> In some cases, it's preferable to provide speed and direction rather
> than vector velocities, at least for some current meters and anemometers
> that measure the former directly. I'm not sure if or how that applies
> to surface currents.
>
> I think the term requested may be surface_sea_water_speed, based on
> reading the definitions and use of the terms velocity and speed in the
> standard names table. A corresponding term for the direction would
> probably be in order, direction_of_surface_sea_water_velocity.
>
> For (non-surface) currents, we have sea_water_speed and
> direction_of_sea_water_velocity, plus a slew of vectors, including
> eastward_ northward_ and upward_sea_water_velocity. There are
> also x & y velocities, which may not require corresponding names for
> surface data.
>
> Would it be useful, or possible, for the on-line standard name search
> routine to return names containing 'speed' when 'velocity' is one of the
> search terms?
>
> Nan
>
> --
> *******************************************************
> * Nan Galbraith (508) 289-2444 *
> * Upper Ocean Processes Group Mail Stop 29 *
> * Woods Hole Oceanographic Institution *
> * Woods Hole, MA 02543 *
> *******************************************************
>
The measurement in question were HF-Radar measurements.
With a combination of different stations a surface velocity vector is
measured.
The measurements are stored as a grid in a netcdf file with the variables
(standard names):
surface_eastward_sea_water_velocity
surface_northward_sea_water_velocity
To visualize the measured data ncWMS/Godiva2 by Jon Blower is used.
This tools takes the components and creates a new display variable
surface_sea_water_velocity which is displayed as a vector.
The automatically created vector surface_sea_water_velocity doesn't exist
in the standard name table.
It would be nice if this vector could be added to the standard name table.
Gisbert
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Dr. Gisbert Breitbach
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Received on Wed Aug 18 2010 - 07:30:28 BST
