[CF-metadata] example of sea_surface_wave_directional_variance_spectral_density

Lowry, Roy K. rkl at bodc.ac.uk
Wed Aug 29 07:54:20 MDT 2012

Hi Ellyn,

Encoding wave spectra in a CF-compliant manner is an issue that I plan to address on behalf of SeaDataNet in the next month or so.  The point I'd reached in thinking this through was to use the timeSeriesProfile feature type with frequency as the z co-ordinate.  I think this OK, but if not I'm sure somebody on this list will shout.

I prefer single-value vectors rather to scalars because it opens the way to packaging multiple instances into a single NetCDF file.

Cheers, Roy.  

-----Original Message-----
From: CF-metadata [mailto:cf-metadata-bounces at cgd.ucar.edu] On Behalf Of Ellyn Montgomery
Sent: 28 August 2012 15:04
To: cf-metadata at cgd.ucar.edu
Subject: [CF-metadata] example of sea_surface_wave_directional_variance_spectral_density

Hello folks-

We want our wave data observations to be CF compliant, with the 
dimensions and representation of time correct.  I believe the data we 
collect fits somewhere under Discrete Samples, since we end up with a 
time series of wave spectra from our stationary, bottom-mounted acoustic 
instruments.  I couldn't find how the file might look in the 1.6 
conventions document or appendices, so could someone please direct me to 
an example dataset that includes some wave spectra?  Help with which 
featureType should be used would also be appreciated.

The Standard Name table says the dimension order should be 
S(t,x,y,f,theta).  Since our data is from a point observation (lat and 
lon are size (1)), can the X,Y dimensions be dropped, or are they needed 
as place-holders?

Thanks very much for the help!

Ellyn T. Montgomery, Oceanographer and Data Manager
U.S. Geological Survey
Woods Hole Coastal and Marine Science Center
384 Woods Hole Road, Woods Hole, MA 02543-1598

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