Average nocturnal light emissions – state 2012

The map shows the nocturnal emissions of light in Flanders observed from space. The Suomi National Polar-orbiting Partnership satellite flies over Flanders after midnight and has a very sensitive sensor (Visible/Infrared Imaging Sensor or VIIRS). Data from this sensor are processed by NASA into global nocturnal light emissions (Román, M.O., Wang, Z., Sun, Q., Kalb, V., Miller, S.D., Molthan, A., Schultz, L., Bell, J., Stokes, E.C., Pandey, B. and Seto, K.C., et al. (2018). NASA's Black Marble nighttime lights product suite. Remote Sensing of Environment 210, 113-143. doi:10.1016/j.rse.2018.03.017). Only high-quality data was used without the influence of atmospheric disturbances, terrain and vegetation disturbances, moonlight, stray light, clouds and snow. This processing takes place on a daily basis. The annual map is based on the annual average of the daily maps, excluding outliers and observations on snow days. The units of the card are Watt/cm2/steradians. This is the power per surface area per angle of space. The map shows the average value of the light masses for the Flemish Region for the reference year 2012.本地图展示了从太空观测到的弗兰德斯（Flanders）地区夜间光辐射状况。苏奥米国家极轨伙伴卫星（Suomi National Polar-orbiting Partnership）会在午夜后飞越弗兰德斯地区，其搭载的可见光/红外成像传感器（Visible/Infrared Imaging Sensor，VIIRS）灵敏度极高。该传感器采集的数据由美国国家航空航天局（NASA）处理为全球夜间光辐射数据集：Román, M.O.、Wang, Z.、Sun, Q.、Kalb, V.、Miller, S.D.、Molthan, A.、Schultz, L.、Bell, J.、Stokes, E.C.、Pandey, B.与Seto, K.C.等（2018）。《NASA黑大理石夜间灯光产品套件》，刊载于《环境遥感（Remote Sensing of Environment）》第210卷，第113-143页，DOI:10.1016/j.rse.2018.03.017。本次研究仅选用不受大气干扰、地形与植被干扰、月光、杂散光、云层及积雪影响的高质量数据。该数据处理流程每日执行一次，年度地图基于每日地图的年度平均值生成，同时剔除异常值与降雪日的观测数据。该地图的单位为瓦特每平方厘米每球面度（Watt/cm²/steradians），即单位表面积、单位空间立体角对应的光功率。本地图展示了2012年基准年弗兰德斯地区的光辐射亮度平均值。