Tohsing, Korntip; Schrempf, Michael; Riechelmann, Stefan; Seckmeyer, Gunther: Validation of spectral sky radiance derived from all-sky camera images - a case study. In: Atmospheric Measurement Techniques 7 (2014), Nr. 7, S. 2137-2146. DOI:
http://dx.doi.org/10.5194/amt-7-2137-2014
Zusammenfassung: |
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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Lizenzbestimmungen: |
CC BY 3.0 Unported - http://creativecommons.org/licenses/by/3.0/de/
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Publikationstyp: |
Article |
Publikationsstatus: |
publishedVersion |
Erstveröffentlichung: |
2014 |
Schlagwörter (deutsch): |
CCD Kamera, Leuchtdichteverteilung, Feldmessung, Optische Eigenschaften, Strahlung, Algorithmus
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Schlagwörter (englisch): |
CCD Camera, Luminance Distributions, Field-Measurements, Optical-Properties, Irradiance, Algorithm, Skylight, View
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Fachliche Zuordnung (DDC): |
550 | Geowissenschaften
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Kontrollierte Schlagwörter: |
Leuchtdichte, Himmelsstrahlung
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