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AttributesValues
type
versionInfo
  • 1
sameAs
preferred label
  • sea_surface_wave_mean_from_direction (en)
Identifier
  • SDN:P07::TISEXP3S
dc:identifier
  • SDN:P07::TISEXP3S
Date
  • 2024-05-20 20:39:48.0
definition
  • The wave direction in each frequency band, calculated from the first-order components of the wave directional spectrum. 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}). ALPHA1 is the mean wave direction, which is determined from the first-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::TISEXP3S
alternative label
owl:deprecated
  • false
note
  • accepted (en)
void:inDataset
has related
http://purl.org/pav/authoredOn
  • 2024-05-20 20:39:48.0
http://purl.org/pav/hasCurrentVersion
http://purl.org/pav/version
  • 1
is sameAs of
is has member of
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