Definition of the CIE standard skies and application of high dynamic range imaging technique to characterize the spatial distribution of daylight in Chile

Maria Beatriz Piderit, Coralie Cauwerts, Muriel Díaz

Abstract


The effectiveness and accuracy of a daylight lighting study relies on knowing the climate and light conditions available at a given place, to then evaluate the illuminance obtained during the project process. This paper presents the methodologies of a research process carried out, whose objective is providing realistic data to provide the foundations for future lighting studies in Chile. It starts with the revision of the metrics to quantify daylight; later, the methodology used to collate the frequency information month-on-month on four types of standard CIE skies, starting from climate files, is presented. Finally, the methodology and the results obtained are shown to measure and characterize the real skies, the High Dynamic Range photographs (HDR) and as complement of this information, the illuminance measurements of the sky dome to define the types of skies of six Chilean cities. From the study applied, it is possible to conclude that knowing the standard CIE skies of a place allows us to adjust and focus the daylighting study for predetermined and predominant skies. It is just as important to mention that the measuring techniques for the skies must be adjusted and calibrated for each studied location.

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