Table of Contents
J. Imaging, Volume 5, Issue 5 (May 2019)
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Cover Story (view full-size image) Artificial light at night (ALAN) exerts significant stress on natural environments around the [...] Read more. Artificial light at night (ALAN) exerts significant stress on natural environments around the world. The deleterious effects of ALAN are compounded by processes such as climate change, which affect biological communities from the level of individuals to ecosystems. National parks, nature reserves, and other protected places act as reservoirs of nighttime darkness, but they are vulnerable to interference from ALAN. Addressing this problem requires understanding its magnitude from local to global scales, in order to prioritize the most promising outdoor lighting and public policy interventions. An array of techniques now exists that involves both photometric and radiometric methods to characterize ALAN in and near protected places. This paper reviews those approaches, provides some specific examples of cutting-edge work, and suggests future directions. View this paper