On the relationship between direct and diffuse radiation (II) δ-2N-stream discrete ordinates method

The relationship between the direct and diffuse radiation for discrete ordinates method (DOM) is analyzed. It is shown that the solution of diffuse radiation is a special case of the solution for direct radiation in δ-2N-stream DOM. No extra effort is needed to find out the solution of diffuse radiation for DOM. Under the single-layer condition, the diffuse reflection/transmission are compared for the δ-two-stream, δ-four-stream, δ-six-stream, and δ-eight-stream approximations.