Module: WrfLibrary::Measurand::Wind

Defined in:
lib/wrf_library/measurand/wind.rb

Overview

Helper module to calculate wind information from the wind vector components

Class Method Summary collapse

Class Method Details

.calculate_winddirection(u_component, v_component) ⇒ Array

method to calculate the wind direction from its two dimenstional components

Parameters:

  • u_component (Array) —

    the horizontal wind component

  • v_component (Array) —

    the vertical wind component

Returns:

  • (Array) —

    the wind directions



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# File 'lib/wrf_library/measurand/wind.rb', line 26

def self.calculate_winddirection(u_component, v_component)
  r2d = 180.0 / (Math.atan(1) * 4.0)
  wind_direction = Array.new()
  u_component.zip(v_component).each { |u, v|
    if (u != 0.0 || v != 0.0) 
      wind_direction << Math.atan2(u, v) * r2d + 180
    else
      # normally atan2(0,0) is undefined, but implementation returns 0, so catch this edge case
      wind_direction << -1 
    end
  }
  wind_direction
end

.calculate_windspeed(u_component, v_component) ⇒ Array

method to calculate the wind speed from its two dimenstional components

Parameters:

  • u_component (Array) —

    the horizontal wind component

  • v_component (Array) —

    the vertical wind component

Returns:

  • (Array) —

    the two dimensional wind speed



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# File 'lib/wrf_library/measurand/wind.rb', line 13

def self.calculate_windspeed(u_component, v_component)
  r2d = 180.0 / (Math.atan(1) * 4.0)
  wind_speed = Array.new()
  u_component.zip(v_component).each { |u, v| 
    wind_speed << Math.sqrt(u**2+v**2)
  }
  wind_speed
end