Validation of spectral sky radiance derived from all-sky camera images – a case study

Tohsing, K.; Schrempf, M.; Riechelmann, S.; Seckmeyer, G.

Spectral sky radiance (380–760 nm) is derived from measurements with a hemispherical sky imager (HSI) system. The HSI consists of a commercial compact CCD (charge coupled device) camera equipped with a fish-eye lens and provides hemispherical sky images in three reference bands such as red, green and blue. To obtain the spectral sky radiance from these images, non-linear regression functions for various sky conditions have been derived. The camera-based spectral sky radiance was validated using spectral sky radiance measured with a CCD spectroradiometer. The spectral sky radiance for complete distribution over the hemisphere between both instruments deviates by less than 20% at 500 nm for all sky conditions and for zenith angles less than 80°. The reconstructed spectra of the wavelengths 380–760 nm between both instruments at various directions deviate by less than 20% for all sky conditions.

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Tohsing, K. / Schrempf, M. / Riechelmann, S. / et al: Validation of spectral sky radiance derived from all-sky camera images – a case study. 2014. Copernicus Publications.

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