Figure 12
From: Dynamics and spatial distribution of global nighttime lights
Largest contiguous light agglomerations detected with increasing thresholds: 30 (upper), 40 (middle) and 50 (bottom). The Western cities, in the left part of the graph, show a stable or slightly decreasing trend, whereas the other half experienced an incredible growth. Note how the trends are independent of the chosen threshold. Interesting are the remarkable growth of Cairo, due to the extraordinary development of the Nile Delta, and the agglomeration of Milano, resulting from the coalescence with the surrounding Monza, Bergamo and Brescia.