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Validation of Spectral Sky Radiance Derived from All-sky Camera Images – a Case Study : Volume 7, Issue 7 (16/07/2014)

By Tohsing, K.

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Book Id: WPLBN0003999405
Format Type: PDF Article :
File Size: Pages 10
Reproduction Date: 2015

Title: Validation of Spectral Sky Radiance Derived from All-sky Camera Images – a Case Study : Volume 7, Issue 7 (16/07/2014)  
Author: Tohsing, K.
Volume: Vol. 7, Issue 7
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Seckmeyer, G., Riechelmann, S., Tohsing, K., & Schrempf, M. (2014). Validation of Spectral Sky Radiance Derived from All-sky Camera Images – a Case Study : Volume 7, Issue 7 (16/07/2014). Retrieved from

Description: Institut für Meteorologie und Klimatologie, Leibniz Universität Hannover, Herrenhäuser Straße 2, Hanover 30419, Germany. 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.

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

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