Roy-
I'm glad that it's on your plate!
Conceptually, I am a bit uncomfortable with having frequency as Z since
many of us think of Z as depth/altitude. Having frequency as Z fits the
shapes allowed, but I wonder what confusion it would start. Are there
ways for clients to identify Z as a non-depth content? Is it as simple
as calling the Z coordinate "frequency" instead of "depth", and then
clients would be able to know what to do?
Then of course the direction component would need to be wedged into the
coordinate system somehow. Such fun!
Looking forward to the discussion!
Ellyn
On 08/29/2012 09:54 AM, Lowry, Roy K. wrote:
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:[email protected]] On Behalf Of Ellyn
Montgomery
Sent: 28 August 2012 15:04
To: [email protected]
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
--
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
(508)457-2356
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