“…Indicator systems have been extensively analysed using density maps and, to a lesser extent, cluster maps [9,22,28,30,34,36,37]. In addition, the considered variables in each study have been likewise analysed using correlations [23,25,38,39,42,43,47] or regression models [8,9,28,30,34,35,40,43,48], and even both statistics used for the same study [12,36,37]. It should be noted that univariate global spatial autocorrelations (Global Moran's Index)-rather than the bivariate one [9,28,30,49]-have been extensively performed in the studies [16,[34][35][36][37]41].…”