Measurements of sky luminance in various meteorological conditions were taken in three localities: Arcavacata di Rende (Italy), Lyon (France) and Osaka (Japan), by means of a sky scanner. The data were compared with Perez, Igawa and CIE luminance calculation models. The analysis of the comparison shows that the best luminance predictions are obtained by the CIE model, but the predictions by the CIE model need the knowledge of the measured luminance distributions themselves and, consequently, this model is, at present, only suitable for the determination of the frequency of occurrence of the CIE sky types in a given place. Between the other two calculation models, Perez and Igawa, the latter appears somewhat more accurate than the former.

Sky luminance measurements and comparison with calculations models.

FERRARO, VITTORIO;
2011

Abstract

Measurements of sky luminance in various meteorological conditions were taken in three localities: Arcavacata di Rende (Italy), Lyon (France) and Osaka (Japan), by means of a sky scanner. The data were compared with Perez, Igawa and CIE luminance calculation models. The analysis of the comparison shows that the best luminance predictions are obtained by the CIE model, but the predictions by the CIE model need the knowledge of the measured luminance distributions themselves and, consequently, this model is, at present, only suitable for the determination of the frequency of occurrence of the CIE sky types in a given place. Between the other two calculation models, Perez and Igawa, the latter appears somewhat more accurate than the former.
Sky Luminance; Experimental Data; Calculation Models
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11770/144892
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