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Workspace Method specular_losCalc
Calculates the specular direction of surface reflections.
A help method to set up the surface properties. This method
calculates specular_los, that is required in several methods
to convert zenith angles to incidence angles.
The method also returns the line-of-sight matching the surface normal.
The default is to consider the surface slope when calculating the
specular direction. That is, the variation of z_surface (as well as
the geoid radius) is considered and the specular direction is calculated
including the specified topography. This part can be deactivated by
setting *ignore_surface_slope* to 1. In this case, the zenith angle of
the specular direction is simply 180-rtp_los. *ignore_surface_slope*
has only an effect for 2D and 3D, as 1D implies a constant radius of
the surface (i.e. no topography).
Authors: Patrick Eriksson