Distribución de Cielo (CIE)

La Comisión Nacional de Iluminación (2004). menciona que es ‘’la Función bidimensional que describe la cantidad de luz diurna procedente de distintas partes del hemisferio celeste en un momento determinado. Cielo despejado, cielo cubierto, cielo parcialmente nublado. La CIE publicó en 1996 la norma «CIE S003 Distribución espacial de la luz diurna - Cielo nublado y cielo despejado estándar CIE». Desde entonces se han examinado otros tipos de cielos y se ha llegado a un consenso internacional sobre su distribución de luminancia y su normalización.
La distribución de la luminancia del cielo depende del tiempo y del clima, y cambia a lo largo del día con la posición del sol. Esta norma enumera un conjunto de distribuciones de luminancia, que modelizan el cielo en una amplia gama de condiciones, desde el cielo muy nublado hasta el tiempo despejado. Su finalidad es doble:
1-Ser una base universal para la clasificación de las distribuciones de luminancia del cielo medidas.
2-Proporcionar un método para calcular la luminancia del cielo en los procedimientos de diseño de la iluminación natural’.

The National Commission on Illumination (2004) mentions that it is “the two-dimensional function that describes the amount of daylight coming from different parts of the celestial hemisphere at a given time. Clear sky, overcast sky, partly cloudy sky. The CIE published the standard “CIE S003 Spatial distribution of daylight - CIE standard cloudy sky and CIE standard clear sky” in 1996. Since then, other types of skies have been examined and an international consensus has been reached on their luminance distribution and standardization.
The luminance distribution of the sky depends on weather and climate, and changes throughout the day with the position of the sun. This standard lists a set of luminance distributions, which model the sky over a wide range of conditions, from very cloudy sky to clear weather. Its purpose is twofold:
1-To be a universal basis for the classification of measured sky luminance distributions.
2-To provide a method for calculating sky luminance in daylighting design procedures'.
The luminance distribution of the sky depends on weather and climate, and it changes during the course of a day with the position of the sun. This standard lists a set of luminance distributions, which model the sky under a wide range of conditions, from the heavily overcast sky to cloudless weather. It is intended for two purposes:
1-To be a universal basis for the classification of measured sky luminance distributions
2-To give a method for calculating sky luminance in daylighting design procedures.

Referencia:

International Commission on Illumination. (2004). Spatial distribution of daylight – CIE standard general sky (ISO 15469:2004(E)/CIE S 011/E:2003). CIE. Retrieved February 6, 2025, from cie.co.at/publications/spatial-distribution-daylight-cie-standard-general-sky

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