This paper presents a comparison between some new models for representing sky luminance, as proposed by Kittler, Darula and Perez, and some typical skies recorded in Sydney, Australia. The results of this study show that these new models are most probably better suited to model skies that are clear or fully overcast as compared with the CIE standard sky models. Skies that have partial cloud coverage are typically more complex than can be modelled using standard models. In such cases special local models would have to be devised.
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