Average nocturnal light emissions – state 2012 to 2022

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 to 2022.本地图展示了从太空观测到的弗兰德斯地区夜间光辐射情况。搭载高灵敏度传感器——可见光/红外成像传感器（Visible/Infrared Imaging Sensor，简称VIIRS）的苏奥米国家极轨伙伴卫星会在午夜后飞越弗兰德斯上空。美国国家航空航天局（NASA）将该传感器获取的数据处理为全球夜间光辐射产品（参考文献：Román, M.O.、Wang, Z.、Sun, Q.、Kalb, V.、Miller, S.D.、Molthan, A.、Schultz, L.、Bell, J.、Stokes, E.C.、Pandey, B.、Seto, K.C.等，2018。NASA的"黑大理石"夜间灯光产品套件，《环境遥感》，第210卷，113-143页，DOI:10.1016/j.rse.2018.03.017）。本数据集仅采用不受大气干扰、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。该数据处理每日进行；年度地图基于每日地图的年度平均值，并剔除异常值与积雪日的观测数据。本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辐射功率。本地图展示了2012至2022年参考时段内弗兰德斯地区的夜间光辐射平均数值。