sea_surface_wave_directional_variance_spectral_density
https://w3id.org/hacid/data/cs/variables/cf/sea_surface_wave_directional_variance_spectral_density <https://w3id.org/hacid/onto/data/Variable>
Sea surface wave directional variance spectral density is the variance of the amplitude of the waves within given ranges of direction and wave frequency.
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sea_surface_wave_directional_variance_spectral_density