New Features to the Night Sky Radiance Model Illumina: Hyperspectral Support, Improved Obstacles and Cloud Reflection
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Published on 2018 by
Highlights: The blue component of the Artifical Sky Brightness (ASB) is lower for distant observers. Ground reflectance and atmospheric extinction attenuate the blue content of the ASB. Full cutoff lamps reduce the ASB but decreases the ASB contrast from horizon to zenith. Buildings and trees can reduce the ASB by a factor of 5 while clouds increase it by a factor of up to 24. Cloudy sky ASB show clumpy structures highly linked to nearby light sources. Abstract: Illumina is one of the most physically detailed artificial night sky brightness model to date. It has been in continuous development since 2005 [1]. In 2016–17, many improvements were made to the Illumina code including an overhead cloud scheme, an improved blocking scheme for subgrid obstacles (trees and buildings), and most importantly, a full hyperspectral modeling approach. Code optimization resulted in significant reduction in execution time enabling users to run the model on standard personal computers for some applications. After describing the new schemes introduced in the model, we give some examples of applications for a peri-urban and a rural site both located inside the International Dark Sky reserve of Mont-Mégantic (QC, Canada).
This Book was ranked at 41 by Google Books for keyword night sky.
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