About: sea_surface_wave_principal_from

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An Entity of Type : skos:Concept, within Data Space : foodie-cloud.org, foodie-cloud.org associated with source document(s)

Attributes	Values
type	Concept
versionInfo	1
sameAs	sea_surface_wave_principal_from_direction sea_surface_wave_principal_from_direction
preferred label	sea_surface_wave_principal_from_direction (en)
Identifier	SDN:P07::TNCL40SJ
dc:identifier	SDN:P07::TNCL40SJ
Date	2024-05-20 20:39:48.0
definition	The wave direction in each frequency band, calculated from the second-order components of the wave directional spectrum. Since there is an ambiguity of 180 degrees in the calculation of Alpha2 (i.e. 90 degrees and 270 degrees result in equivalent spectra), the value closer to Alpha1 is selected. The full directional wave spectrum is described as a Fourier series: S = a0/2 + a1cos(theta) + b1sin(theta) + a2cos(2theta) + b2sin(2theta). The Fourier coefficients a1, b1, a2, & b2 can be converted to polar coordinates as follows: R1 = (SQRT(a1a1+b1b1))/a0, R2 = (SQRT(a2a2+b2b2))/a0, ALPHA1 = 270.0-ARCTAN(b1,a1), ALPHA2 = 270.0-(0.5*ARCTAN(b2,a2)+{0 or 180, whichever minimizes the difference between ALPHA1 and ALPHA2}). ALPHA2 is the principal wave direction, which is determined from the second-order Fourier coefficients. This spectral parameter is a separate quantity from the bulk parameter (MWDIR), which has the standard name sea_surface_wave_from_direction_at_variance_spectral_density_maximum. 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. (en)
notation	SDN:P07::TNCL40SJ
alternative label
owl:deprecated	false
note	accepted (en)
void:inDataset	http://vocab.nerc.ac.uk/.well-known/void
has related	http://vocab.nerc.ac.uk/collection/P06/current/UAAA/
http://purl.org/pav/authoredOn	2024-05-20 20:39:48.0
http://purl.org/pav/hasCurrentVersion	http://vocab.nerc.ac.uk/collection/P07/current/TNCL40SJ/1/
http://purl.org/pav/version	1
is sameAs of	sea_surface_wave_principal_from_direction sea_surface_wave_principal_from_direction
is has member of	Climate and Forecast Standard Names

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