Dear Elodie Thanks for your postings. I hope you don't mind my making some more comments.
> - *sea_surface_wave_significant_height* > The already existing definition is "Height is the vertical distance > above the surface." We believe that this definition defines the > "sea_surface_wave_height" part, but not the "significant" part. Could it > be possible to revise it to make it more precise? We think that a more > precise definition could be :"Height is the vertical distance above the > surface. The significant height is defined as the average height of the > highest third of observed sea surface waves over a 30 minutes period." "height" by itself in CF names means above the land surface or the sea surface. I don't think that's what you mean in "wave height", really. What is the level with respect to which the wave height is measured? I agree that "significant wave height" can't be described by existing cell_methods. We could introduce a new cell_method for this purpose i.e. the mean of the largest third. This would be an alternative to naming it as a different quantity from "wave height". However, mean wave height and maximum wave height could be described by existing cell_methods. I wonder why the definitions all refer to a 30-minute period. If the data variable has a time dimension, it could indicate any time interval to which the statistical operations apply. > - *sea_surface_wave_height_of_highest_tenth* > Height is the vertical distance above the surface. The height of the > highest tenth is defined as the average height of the highest tenth of > observed sea surface waves over a 30 minutes period. This is a similar sort of definition to "significant height", but with a different percentile (1/10 instead of 1/3). Again, we could define a cell_method for this. If it's named specifically, why is it not mean_wave_height_of_highest_tenth? > - *sea_surface_wave_height_of_the_highest_crest* > The crest is the vertical distance above the mean sea surface to the > maximum in a wave. Height of the highest crest is the maximum value of > wave crests observed over a 30 minutes period. > > - *sea_surface_wave_deepest_trough* > Trough is the vertical distance below the mean sea surface to the > minimum in a wave. The deepest trough is the maximum value of wave > troughs observed over a 30 minutes period. These two names look like they should be opposites, but they are not named in a corresponding way. What's the difference between maximum wave height and height of the highest crest? Best wishes Jonathan _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
