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Workspace Method surface_rtpropFromTypesAverage

Description

Extracts surface RT properties by averaging.

This method allows to let one pencil beam calculation represent
an area when it comes to surface RT properties. The surface is
sampled at a set of positions. The sampling is defined as a set
of angles by the WSV dlos.

A weight must be specified for each angle by dlos_weight_vector.
These weights should represent the solid angle each dlos covers,
but can also include other weighting factors such as antenna pattern.
The sum of dlos_weight_vector is internally normalised to 1.

All the output variables are a weighted average between the surface
types inside the area sampled.

Authors: Patrick Eriksson

Synopsis

surface_rtpropFromTypesAverage(

surface_type_mix, surface_skin_t, surface_los, surface_rmatrix, surface_emission, f_grid, stokes_dim, atmosphere_dim, lat_grid, lon_grid, lat_true, lon_true, rtp_pos, rtp_los, refellipsoid, surface_type_mask, surface_rtprop_agenda_array, z_sensor, dlos, dlos_weight_vector )

Variables

OUT	surface_type_mix	(Vector)	Gives the fraction of different surface types.
OUT	surface_skin_t	(Numeric)	Surface skin temperature.
OUT	surface_los	(Matrix)	Downwelling radiation directions to consider in surface reflection.
OUT	surface_rmatrix	(Tensor4)	The reflection coefficients for the directions given by surface_los to the direction of interest.
OUT	surface_emission	(Matrix)	The emission from the surface.
IN	f_grid	(Vector)	The frequency grid for monochromatic pencil beam calculations.
IN	stokes_dim	(Index)	The dimensionality of the Stokes vector (1-4).
IN	atmosphere_dim	(Index)	The atmospheric dimensionality (1-3).
IN	lat_grid	(Vector)	The latitude grid.
IN	lon_grid	(Vector)	The longitude grid.
IN	lat_true	(Vector)	Latitudinal geolocation for 1D and 2D data.
IN	lon_true	(Vector)	Longitudinal geolocation for 1D and 2D data.
IN	rtp_pos	(Vector)	Position of a radiative transfer point.
IN	rtp_los	(Vector)	Line-of-sight at a radiative transfer point.
IN	refellipsoid	(Vector)	Reference ellipsoid.
IN	surface_type_mask	(GriddedField2)	Classification of the surface using a type coding.
IN	surface_rtprop_agenda_array	(ArrayOfAgenda)	Description of surface radiative properties, for each surface type.
IN	z_sensor	(Numeric)	The altitude of the sensor.
IN	dlos	(Matrix)	A set of relative angles.
IN	dlos_weight_vector	(Vector)	A weight associated with each direction dlos.