Estimation of spectral distribution of sky radiance using a commercial digital camera

Applied Optics
Masanori SaitoIsao Murata

Abstract

Methods for estimating spectral distribution of sky radiance from images captured by a digital camera and for accurately estimating spectral responses of the camera are proposed. Spectral distribution of sky radiance is represented as a polynomial of the wavelength, with coefficients obtained from digital RGB counts by linear transformation. The spectral distribution of radiance as measured is consistent with that obtained by spectrometer and radiative transfer simulation for wavelengths of 430-680 nm, with standard deviation below 1%. Preliminary applications suggest this method is useful for detecting clouds and studying the relation between irradiance at the ground and cloud distribution.

References

Oct 6, 2005·Applied Optics·Juan L NievesJavier Romero
Oct 1, 2008·Optics Express·Fred SigernesCharles Sterling Deehr
Nov 28, 2008·Applied Optics·Raymond L Lee
Nov 28, 2008·Applied Optics·Francisco J OlmoJavier Romero
Nov 28, 2008·Applied Optics·Miguel A López-AlvarezL Alados-Arboledas
Mar 5, 2010·Journal of Environmental Management·O RabazaF Aznar Dols
Mar 13, 2013·Applied Optics·Korntip TohsingGunther Seckmeyer

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