3.5. Reconstruction of activity data
The UBN index, which exhibited a symmetrical distribution and a high correlation with NVPC, was identified as the most suitable indicator for all regions under analysis (Fig. 8). The best fit is indicated by the following equation
where, l denotes the geographical area of interest.
Regarding the other indicators, GGP by province correlated with NV (r2 = 0.98).
However, its low availability for smaller regions impairs its usage as a driving variable. In general, population, population density and HDI did not correlate with either NV or NVPC.