论文标题
迈向人造全天空亮度的全球地图
Towards a global map of the artificial all-sky brightness
论文作者
论文摘要
建模人为来源的半球夜空亮度是一项艰巨的计算挑战，这是由于生产具有精细角度分辨率的全天空图所需的大量计算，包括高阶散射效应。我们在这封信中介绍了由人造光源产生的全天空辐射的物理一致，半分析的两参数模型，该模型在观察者上方的天空的各个方向上有效地编码了光谱辐射。该功能的两个参数源自大气状态，与观察者的距离以及源的角度和光谱发射模式。使用夜间卫星图像和地面真实照明库存中可获得的信息，可以通过添加周围人造源的贡献来轻松计算地球上任何地方的人为全天空光芒。这为阐述了人造全套亮度的全球世界地图打开了道路。
Modeling the hemispherical night sky brightness of anthropogenic origin is a demanding computational challenge, due to the intensive calculations required to produce all-sky maps with fine angular resolution including high-order scattering effects. We present in this Letter a physically consistent, semi-analytic two-parameter model of the all-sky radiance produced by an artificial light source that encodes efficiently the spectral radiance in all directions of the sky above the observer. The two parameters of this function are derived from the state of the atmosphere, the distance to the observer, and the source's angular and spectral emission pattern. The anthropogenic all-sky radiance at any place on Earth can be easily calculated by adding up the contributions of the surrounding artificial sources, using the information available from nighttime satellite imagery and ground-truth lighting inventories. This opens the way for the elaboration of a global world map of the artificial all-sky brightness.
