Dear Rob >From the responses it's clear we need a name for this. I'm a bit nervous about "spread", which sounds vague to me. Can you clarify it?
Best wishes and thanks Jonathan On Fri, Sep 28, 2018 at 07:47:51AM +0000, Rob Thomas wrote: > Date: Fri, 28 Sep 2018 07:47:51 +0000 > From: Rob Thomas <[email protected]> > To: "[email protected]" <[email protected]> > Subject: [CF-metadata] Spectral wave direction spread parameter > > Hi, > > > > Please can I propose/request a new standard name for the list: > "sea_surface_wave_directional_spread_at_variance_spectral_density_maximum" > > > > The rationale for this request is that in assessing our mappings of spectral > wave parameters to the CF standard names we have mapped "Peak Direction" > (described as "Dirp Direction for waves at peak of wave energy spectrum from > which the waves are coming") to > "sea_surface_wave_from_direction_at_variance_spectral_density_maximum" with > definition: > > > The quantity with standard name > sea_surface_wave_from_direction_at_variance_spectral_density_maximum is the > direction from which the most energetic waves are coming. The spectral peak > is the most energetic wave in the total wave spectrum. The phrase > "from_direction" is used in the construction X_from_direction and indicates > the direction from which the velocity vector of X is coming. The direction is > a bearing in the usual geographical sense, measured positive clockwise from > due north. The wave directional spectrum can be written as a five dimensional > function S(t,x,y,f,theta) where t is time, x and y are horizontal coordinates > (such as longitude and latitude), f is frequency and theta is direction. S > has the standard name sea_surface_wave_directional_variance_spectral_density. > S can be integrated over direction to give S1= integral(S dtheta) and this > quantity has the standard name sea_surface_wave_variance_spectral_density. > > > > It does not appear there is an appropriate partner term for Peak Spread > (described as "Dsprp Directional spread of waves at peak of wave energy > spectrum") because the options currently available do not appear to tie in to > the peak wave energy spectrum/spectral peak information. > > > > Kind regards, > > Rob > > > > Dr. Rob Thomas > > Senior Data Analyst - European Data Management Projects Team Leader > > > > Marine Institute, Rinville, Oranmore, County Galway, H91 R673, Ireland > > Tel: (+)353 (0)91 387 409 > > Mob: (+)353 (0)87 952 3467 > > Email: [email protected]<mailto:[email protected]> > > ORCID: 0000-0001-6068-4924 > > Web: http://data.marine.ie/ > _______________________________________________ > CF-metadata mailing list > [email protected] > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
