On Thu, Sep 17, 2015 at 3:12 AM, <alison.pamment at stfc.ac.uk> wrote:
> Dear Chris,
>
> Thanks for your comments on these names.
>
All sounds good -- go for it!
-CHB
> 1. "Thickness" is the term generally used in CF standard names to describe
> the vertical extent of a layer. For example, we have the existing names
> atmosphere_boundary_layer_thickness and ocean_mixed_layer_thickness, and
> there are quite a number of others that follow this pattern. Therefore I
> think flood_water_thickness is the correct term for the new name.
>
> 2. The name as proposed can be used with a vertical coordinate variable or
> scalar coordinate variable to specify the altitude/height above the solid
> earth surface to which the speed applies. So you could have a speed that
> varies in the vertical or a mean speed representative of the whole
> flood_water layer. If the latter is required, you would use a scalar
> vertical coordinate with coordinate bounds specifying the full extent of
> the layer and a cell_methods of "altitude: mean". If the data values were
> simply taken from a representative level you would do the same thing except
> to specify a cell_methods of "altitude:point", I think. This flexibility
> means that we don't need to be prescriptive about vertical processing in
> the standard name definition.
>
> 3. Indeed this is a new name (distinct from the existing name
> surface_altitude). It is longstanding CF practice that we don't add new
> standard names unless someone has an actual need for them. Occasionally,
> this may lead to "gaps" in the standard name table which some people find
> surprising, but if a commonly used quantity is "missing" it simply means
> that no one has ever asked for it :)
>
> Best wishes,
> Alison
>
> ------
> Alison Pamment Tel: +44 1235 778065
> Centre for Environmental Data Analysis Email:
> alison.pamment at stfc.ac.uk
> STFC Rutherford Appleton Laboratory
> R25, 2.22
> Harwell Oxford, Didcot, OX11 0QX, U.K.
>
>
> From: Chris Barker [mailto:chris.barker at noaa.gov]
> Sent: 16 September 2015 18:54
> To: Pamment, Alison (STFC,RAL,RALSP)
> Cc: Eizi TOYODA; cf-metadata at cgd.ucar.edu
> Subject: Re: [CF-metadata] new standard names for flood simulation
>
> All good.
>
> A couple nitpicky questions:
>
> 1. flood_water_thickness (m)
>
> I'd expect this to be "flood_water_depth" -- never heard the term
> thickness used. Or does that use of depth conflict with a definition
> elsewhere. In which case, maybe a note is in order.
>
> 2. flood_water_speed (m s-1)
> 'Speed is the magnitude of velocity. Flood water is water that covers land
> which is normally not covered by water.'
>
> id this depth-averaged, or at a given depth, height, etc? or is that
> distinction defined elsewhere depending on use?
>
> 5. ground_level_altitude (m)
> 'The ground_level_altitude is the geometric height of the upper boundary
> of the solid Earth above the geoid, which is the reference geopotential
> surface. The geoid is similar to mean sea level.'
>
> we really don't already have this? interesting....
>
>
> But good stuff overall.
>
> -Chris
>
>
> --
>
> Christopher Barker, Ph.D.
> Oceanographer
>
> Emergency Response Division
> NOAA/NOS/OR&R (206) 526-6959 voice
> 7600 Sand Point Way NE (206) 526-6329 fax
> Seattle, WA 98115 (206) 526-6317 main reception
>
> Chris.Barker at noaa.gov
>
--
Christopher Barker, Ph.D.
Oceanographer
Emergency Response Division
NOAA/NOS/OR&R (206) 526-6959 voice
7600 Sand Point Way NE (206) 526-6329 fax
Seattle, WA 98115 (206) 526-6317 main reception
Chris.Barker at noaa.gov
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