论文标题
用全套光度法映射城市的亮度和颜色到农村天才
Mapping the brightness and color of urban to rural skyglow with all-sky photometry
论文作者
论文摘要
人造Skyglow是一种光污染的一种形式，对环境具有广泛的影响。 Skyglow的程度，强度和颜色取决于人造光源和天气条件。 Skyglow可以最好地通过基于地面的仪器确定。我们绘制了德国柏林的Skyglow，以使其在城市范围内外的晴朗的天空和绿色的天空状况。我们使用从柏林市中心向柏林以南58公里以上的乡村地区进行了观测，该横除使用带有校准的商用数码相机和鱼眼镜头的全套光度计进行了观察。从多光谱成像数据中，我们处理了亮度和相关的色温图。我们同时提取了天顶的夜空亮度和相关的色温以及水平和标量照明。我们计算了每个站点的云扩增因子，并研究了距离的亮度和颜色的变化，尤其是在城市限制内部和外部显示差异。我们发现，在市中心，高于满月光线和扩增因子高于25的照明值，以及朝着城市限制和城市限制外的梯度。我们进一步观察到，几乎在所有情况下，云都会降低相关的色温。我们讨论了我们方法的优势和弱点，将结果与建模的夜空亮度数据进行比较，并为将来的工作提供建议。
Artificial skyglow is a form of light pollution with wide ranging implications on the environment. The extent, intensity and color of skyglow depends on the artificial light sources and weather conditions. Skyglow can be best determined with ground based instruments. We mapped the skyglow of Berlin, Germany, for clear sky and overcast sky conditions inside and outside of the city limits. We conducted observations using a transect from the city center of Berlin towards a rural place more than 58 km south of Berlin using all-sky photometry with a calibrated commercial digital camera and a fisheye lens. From the multispectral imaging data, we processed luminance and correlated color temperature maps. We extracted the night sky brightness and correlated color temperature at zenith, as well as horizontal and scalar illuminance simultaneously. We calculated cloud amplification factors at each site and investigated the changes of brightness and color with distance, particularly showing differences inside and outside of the city limits. We found high values for illuminance above full moon light levels and amplification factors as high as 25 in the city center and a gradient towards the city limit and outside of the city limit. We further observed that clouds decrease the correlated color temperature in almost all cases. We discuss advantages and weaknesses of our method, compare the results with modeled night sky brightness data and provide recommendations for future work.
