On Thu, Sep 17, 2015 at 3:12 AM, <[email protected]> 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: > [email protected] > STFC Rutherford Appleton Laboratory > R25, 2.22 > Harwell Oxford, Didcot, OX11 0QX, U.K. > > > From: Chris Barker [mailto:[email protected]] > Sent: 16 September 2015 18:54 > To: Pamment, Alison (STFC,RAL,RALSP) > Cc: Eizi TOYODA; [email protected] > 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 > > [email protected] > -- 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 [email protected]
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