To facilitate the generation of mission requirements from user requirements it is necessary to prepare adequate radiative transfer modelling tools. This document describes the objectives and the results of a study performed under EUMETSAT Contract EUM/CO/06/1529/PS Reference Tool for Simulation of VIS/NIR Spectral Radiances, in support of the PostEPS mission on Cloud, Precipitation, and largescale Land surface imaging (CPL). The CPL mission will require a capability to coprocess data from passive instruments working in the broadest possible spectral range. The purpose of the study is to extend the existing validated linebyline model LBLMS to develop towards a unified scheme to compute radiance and fluxes from UV to far infrared in any direction in space for a planeparallel atmosphere. The scheme is based on linebyline methods to compute optical depths at high spectral resolution and on the adding/doubling method to solve the radiative transfer equation in a scattering atmosphere.
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