cie_table: Set of 15 CIE Standard Skies
In rcaiman: CAnopy IMage ANalysis
cie_table R Documentation
Set of 15 CIE Standard Skies
Description
The Commission Internationale de l’Éclairage (CIE; International Commission
on Illumination) standard \insertCiteCIE2004rcaiman defines 15
pre-calibrated sky luminance distributions, each described by a pair of
analytical functions, the gradation function
\Phi(\theta) = 1 + a \cdot \exp\left(\frac{b}{\cos\theta}\right),
and the indicatrix function
f(\chi) = 1 + c \cdot \left[ \exp(d \cdot \chi) - \exp\left(d \cdot \frac{\pi}{2}\right) \right] + e \cdot \cos^2\chi.
Combined, they can predict the relative radiance \rho_R in any sky
direction (\theta, \phi) as:
\hat{\rho_R}^{\circ}(\theta, \phi) =
\frac{\Phi(\theta) \cdot f(\chi(\theta, \phi; \theta_\odot, \phi_\odot))}
{\Phi(0) \cdot f(\chi(\theta, \phi; 0, 0))}
, where \theta is the zenith angle, \phi is the azimuth angle,
and \theta_\odot, \phi_\odot are the zenith and azimuth of the sun disk.
Usage
cie_table
Format
data.frame with 15 rows and 8 columns:
agradation function parameter.
bgradation function parameter.
cindicatrix function parameter.
dindicatrix function parameter.
eindicatrix function parameter.
indicatrix_groupfactor with six categories and numerical tags.
general_sky_typefactor with three categories: "Overcast",
"Clear", and "Partly cloudy".
descriptionuser-friendly description of the sky type.
Source
\insertCiteLi2016;textualrcaiman
References
\insertAllCited
rcaiman documentation built on Sept. 9, 2025, 5:42 p.m.
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| cie_table | R Documentation |
Set of 15 CIE Standard Skies
Description
The Commission Internationale de l’Éclairage (CIE; International Commission
on Illumination) standard \insertCiteCIE2004rcaiman defines 15
pre-calibrated sky luminance distributions, each described by a pair of
analytical functions, the gradation function
\Phi(\theta) = 1 + a \cdot \exp\left(\frac{b}{\cos\theta}\right),
and the indicatrix function
f(\chi) = 1 + c \cdot \left[ \exp(d \cdot \chi) - \exp\left(d \cdot \frac{\pi}{2}\right) \right] + e \cdot \cos^2\chi.
Combined, they can predict the relative radiance \rho_R in any sky
direction (\theta, \phi) as:
\hat{\rho_R}^{\circ}(\theta, \phi) =
\frac{\Phi(\theta) \cdot f(\chi(\theta, \phi; \theta_\odot, \phi_\odot))}
{\Phi(0) \cdot f(\chi(\theta, \phi; 0, 0))}
, where \theta is the zenith angle, \phi is the azimuth angle,
and \theta_\odot, \phi_\odot are the zenith and azimuth of the sun disk.
Usage
cie_table
Format
data.frame with 15 rows and 8 columns:
agradation function parameter.
bgradation function parameter.
cindicatrix function parameter.
dindicatrix function parameter.
eindicatrix function parameter.
indicatrix_groupfactor with six categories and numerical tags.
general_sky_typefactor with three categories:
"Overcast","Clear", and"Partly cloudy".descriptionuser-friendly description of the sky type.
Source
\insertCiteLi2016;textualrcaiman
References
\insertAllCitedR Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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