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Workspace Method irradiance_fieldFromRadiance

Description

Calculate the irradiance also known as flux density from the radiance_field .
by integrating over the angular grids according to the grids set
by AngularGridsSetFluxCalc 
See *AngularGridsSetFluxCalc to set 
*za_grid, aa_grid, and za_grid_weights*

Authors: Manfred Brath

Synopsis

irradiance_fieldFromRadiance( irradiance_field, radiance_field, za_grid, aa_grid, za_grid_weights )

Variables

OUTirradiance_field(Tensor4)Irradiance also known as flux density.
INradiance_field(Tensor5)Radiant flux per unit solid angle per unit projected area seperately for each hemisphere.
INza_grid(Vector)Zenith angle grid.
INaa_grid(Vector)Azimuthal angle grid.
INza_grid_weights(Vector)TBD.