New features features to the night sky radiance model illumina: Hyperspectral support, improved obstacles and cloud reflection

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 pen-urban and a rural site both located inside the International Dark Sky reserve of Mont-Megantic (QC, Canada). (C) 2018 Elsevier Ltd. All rights reserved.