Figure 4
From: Allometric scaling, size distribution and pattern formation of natural cities
Fractal dimension v.s. size of clusters for (a) North America (2009) (DNth=4) and (b) model simulation. One example of using box-counting method in calculating the fractal dimension of nighttime light cluster is illustrated at the lower right corner in (a). Saturated clusters marked in yellow include pixels with DN equals to DNmax of the satellite image, while unsaturated ones marked in grey only include pixels with DN smaller than DNmax. Only the fractal dimension of clusters larger than 60×60 km2 is calculated.
