Fig. 2.13. Color coded maps representing the spatial distributions of centrality in Cairo, an example of a largely self-organized city. The four indices of node centrality, (a) closeness; (b) betweenness; (c) straightness and (d) information, are visually compared over the spatial graph. Different colors represent classes of nodes with different values of the centrality index. The classes are defined in terms of multiples of standard deviations from the average, as reported in the color legend. Figure taken from Ref. [47].
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