Harmonised Night-light Data

However, due to the lack of on-board calibration, it necessitates inter-annual calibration for practical applications. In this dataset, a stepwise calibration approach was employed to generate a temporally consistent NTL time series spanning from 1992 to 2013.

Initially, temporal inconsistencies in the original NTL time series were identified. Subsequently, a stepwise calibration scheme was developed to systematically address over- and under-estimations in NTL images derived from specific satellites and years, utilizing temporally neighboring images as references for calibration. Following the stepwise calibration, the raw NTL series demonstrated improvement with a more consistent temporal trend.