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In the first stages of this research, presented Chapter 5, we consciously decided to not undertake least-cost-path analyses because we were interested in exploratory and experimental applications of network science approaches, and we were aware of several issues raised in the application of least-cost-path analysis. Therefore the trade-off between costs and benefits of such an application did not seem remunerative enough or worthwhile in the first instance. However, it was also clear from the analyses that the variable of distance was relevant for the analyses and that an integration of network science approaches within GIS applications, now more and more common, is promising and profitable.1 Therefore, this chapter present a multi-scale analysis of transportation routes in Etruria and Latium vetus based on least-cost path analyses, although we are aware of the critique and problems of such applications.2
Our purpose, in this chapter, is to infer how settlements were organised at the regional level by analysing the structure formed by the roads that connected them. The basic idea is to compare different hypotheses and quantitatively assess which of them is (or are) more plausible and, we do this in three steps (see Section 3.2). Adopting a network science approach implies that the first step is to translate available information on pathways from the usual map format into networks, that is, mathematical structures made up of interconnected objects. Once the empirical system is mapped onto weighted geographical networks, one can apply the established analytic tools provided by network science for their characterisation.
For this work, settlements from Latium vetus and southern Etruria from the end of the Bronze Age to the end of the Archaic Period have been considered. These sites are very well known and documented thanks to a long tradition of studies that goes back to the first topographic studies conducted within the tradition of the aristocratic grand tours of Rome and the Roman countryside during the 18th century. British and German aristocrats, fascinated by the possibility of interacting and getting closer to ancient authors through the contemplation and study, were the first to produce catalogues and descriptions of the monuments and environment of the so-called Campagna Romana, including both the immediate surroundings of Rome and the southern Etruscan region, respectively, to the south and north of the Tiber river.1 Subsequently this early activity of survey and documentation was continued by the antiquarian tradition of the late 19th to early 20th century2 and the more recent landscape and topographic traditions before3 and after World War II, by both Italian4 and international scholars.5