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The PoPaTERVA project is developing applied research regarding the comprehension of the multi-layered culturalbackground of the Terva Valley Archaeological Park, in Boticas, Portugal. One of the main aspects focused on theproject is the appliance of remote sensing techniques to enhance non visible archaeological features. An earth resistancetomography (ERT) survey was carried out at the Sapelos hillfort, by the specialized SINERGEO geophysicist’s team,using a Wenner-Schlumberger array. The resulting data was analyzed by the authors in order to extract and verify validarchaeological features regarding the settlement’s structures. There are several adequate systems that can be used tovisualize the surveyed data (x, y, z, Ω). However, the authors preferred the open source Visualization Toolkit (VTK)from Kitware Inc., since it supports several visualization and modelling techniques that are useful for interpretationpurposes in archaeological contexts: for instance, it is possible to represent the archaeological site as a virtual scalemodel, which can be freely manipulated. For the Sapelos hillfort, two distinct visualizations were developed to representthe acquired electrical resistivity data. The first one is used to create a comprehensive volume from the surveyed data,which is imported as structured 3D points and mapped into a 3D volume. However, this representation does not providethe necessary insight for analysis purposes, so a second visualization is needed to cluster the relevant data forarchaeological research. This visualization is based on contouring algorithms that generate isosurfaces from scalarresistivity values (Ω), therefore enhancing the features with potential archaeological interest

Feature enhancement from electrical resistivity data in an archaeological survey: the Sapelos hillfort experiment (Boticas, Portugal)