"SDN:P07::KZRZCYPD" . "accepted"@en . "" . . "SDN:P07::KZRZCYPD" . . "The quantity with standard name sea_surface_swell_wave_from_direction_at_variance_spectral_density_maximum is the direction from which the most energetic waves are coming in the swell wave component of a sea. Swell waves are waves on the ocean surface and are the low frequency portion of a bimodal wave frequency spectrum. The spectral peak is the most energetic wave in the wave spectrum partition. 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 swell 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."@en . "1" . "2020-02-03 16:02:29.0" . . "SDN:P07::KZRZCYPD" . "sea_surface_swell_wave_from_direction_at_variance_spectral_density_maximum"@en . "2020-02-03 16:02:29.0" . . . "1" . . "false" .