Color and Spectral Analysis of Daylight in Southern Europe
NAVAL ACADEMY ANNAPOLIS MD MATHEMATICS AND SCIENCES DIV
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We have analyzed the colorimetric and spectral characteristics of 2600 daylight spectra global spectral irradiances on a horizontal surface measured for all sky states during a 2-year period at Granada, Spain. We describe in detail the chromaticity coordinates, correlated color temperatures CCT, luminous efficacies, and relative UV and IR contents of Granada daylight. The chromaticity coordinates of Granada daylight lie far above the CIE locus at high CCTs greater than 9000 K, and a CCT of 5700 K best typifies this daylight. Our principal components analysis shows that Granada daylight spectra can be adequately represented by using six dimensional linear models in the visible, whereas seven-dimensional models are required if we include the UV or near-IR. Yet on average only three-dimensional models are needed to reconstruct spectra that are colorimetrically indistinguishable from the original spectra.
- Atmospheric Physics
- Atomic and Molecular Physics and Spectroscopy