@classmethod
def HomogeneousOcean(cls, wind_speed, wind_azimuth, salinity,
    pigment_concentration):
    """Parameterisation for a surface BRDF based on the Ocean BRDF model.

        The parameters are:

        - wind speed (in m/s)
        - azimuth of the wind (in degrees)
        - salinity (in ppt) (set to 34.3ppt if < 0)
        - pigment concentration (in mg/m3)

        """
    return (
        '0 Homogeneous surface\n1 (directional effects)\n6 (Ocean BRDF)\n%f %f %f %f\n'
         % (wind_speed, wind_azimuth, salinity, pigment_concentration))
