ERT investigation of tumuli: Does the errors in locating electrodes influence the resistivity?

Among the princely tumuli near Vetulonia (Tuscany, Italy) the one of Poggio Pepe has never thoroughly been investigated. A joint project among three different departments of the University of Florence, lead to a new investigation campaign on this tumulus. The main goals are to verify the conservation structures state and to identify the tomb ancient access by means of geophysical methods. Moreover, this project aims to evaluate the influence on the geophysical acquired data of the error in collecting the geographical coordinates of the surface acquisition points. Optimizing the input data, in fact, it is possible to improve the anomalies localization and therefore facilitate the design of the excavation survey and the management of the research funding. The first results allow to make some assumptions about the state of the structures buried and suggest that in case of consistent error in locating acquisition points the measurement accuracy is strongly influenced.