This research performs an uncertainty analysis on each of the steps utilized to convert GEO radiances to fluxes. This will help pinpoint inadequate steps and to minimize potential errors that can propagate through the process. The GEO narrowband radiances are converted to fluxes using the following steps. The CERES project inter-calibrates the GEO radiances using MODIS as a reference and for temporal stability; GEO imagers were designed for weather forecasting and most do not have onboard calibration systems. Once the GEOs are calibrated the narrowband radiances must be converted to broadband CERES-like radiances. This is challenging, since each of the GEOs have their own spectral response functions. The converted radiances are then passed to an angular distribution model (ADM) to derive the fluxes. This step requires consistent scene type identification across GEO domains. GEO derived fluxes are then normalized to the CERES fluxes in order to maintain CERES calibration. This study will focus on the narrowband to broadband process and the ADM used in the SYN1deg product.