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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[0]. *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


specular_losCalc( specular_los, surface_normal, rtp_pos, rtp_los, atmosphere_dim, lat_grid, lon_grid, refellipsoid, z_surface, ignore_surface_slope )


OUTspecular_los(Vector)The specular direction (for reflection by a flat surface).
OUTsurface_normal(Vector)The normal vector for a point at the surface.
INrtp_pos(Vector)Position of a radiative transfer point.
INrtp_los(Vector)Line-of-sight at a radiative transfer point.
INatmosphere_dim(Index)The atmospheric dimensionality (1-3).
INlat_grid(Vector)The latitude grid.
INlon_grid(Vector)The longitude grid.
INrefellipsoid(Vector)Reference ellipsoid.
INz_surface(Matrix)The surface altitude.
GINignore_surface_slope(Index, Default: 0)Flag to control if surface slope is consdered or not.