Abstract
ABSTRACT Services related to generating and distributing electrical power are essential to economic growth and development. This study investigates the temporal patterns of night-time light (NTL) recorded by the Visible Infrared Imaging Radiometer Suite (VIIRS) on orbiting satellites. The time series data covers the years 2012 through 2022. The findings show that the year-on-year changes in lighting are quite small. Most major cities’ luminosity has diminished, whereas smaller cities have remained relatively constant. Using statistical approaches, this study located areas of hot and cold spots of NTL trends across Gauteng Province using a space–time cube. By using space–time cubes, it is possible to visualise how phenomena evolve over time and space. The most worrying is the diminishing hot spot located at the economic powerhouse of South Africa, Johannesburg. The study also used three-dimensional visualisation to comprehend better the underlying patterns represented by each hot spot. This dataset makes it possible to determine where urban sprawl occurs in the province, as they are characterised by new, consecutive, and sporadic hot spots. By looking at spatiotemporal dynamic changing patterns, it is easy to find complex patterns that change over time and space and provide valuable information for NTL.
Published Version
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