Responses of Suomi- NPP VIIRS- derived nighttime lights to socioeconomic activity in China's cities

Remotely sensed measurements of anthropogenic nocturnal lighting have been extensively used for studying human settlements and socioeconomic dynamics. Considerable efforts have been devoted to build the connections between nightlight signals and demographic and economic variables at local to global scales in order to obtain observationally based estimates for human activity. Recently, the first cloud-free composite of global nighttime light data derived from the Suomi National Polar orbiting Partnership (Suomi-NPP) with the Visible Infrared Imaging Radiometer Suite (VIIRS) sensor yields an increasingly clearer view of the earth surface on nights. The responses to socioeconomic activity and the potential utility of VIIRS nighttime light data, however, still remain less well understood. In this study, we examined the quantitative relationships between VIIRS nightlight-derived indices and socioeconomic variables at fine and local scales. Our results suggest that the total night radiance has significant positive associations with two airport performance indicators - passenger traffic and aircraft movement. In addition, there is a strong correlation with four urbanization variables - human population, gross domestic product, electric power consumption and paved road area. Our findings suggest that VIIRS nightlight data could be more indicative of socioeconomic dynamics and may provide insights into the potential applications for studying human settlement and urbanization processes based on anthropogenic nocturnal lighting.