Datafication of an Ancient Greek City: Multi-sensorial Remote Sensing of Heloros (Sicily) Davide Tanasi 1(B ) , Stephan Hassam 1 , Dario Calderone 2 , Paolino Trapani 3 , Nicola Lercari 2 , Gerardo Jim´ enez Delgado 4 , and Rosa Lanteri 5 1 University of South Florida, Institute for Digital Exploration (IDEx), 4202 E. Fowler Ave, Tampa, FL 33620, USA dtanasi@usf.edu 2 Ludwig Maximilian University of Munich, Institute for Digital Cultural Heritage Studies, Geschwister-Scholl-Platz 1, Munich 80539, Germany 3 Universit´a di Catania, Dipartimento di Scienze Umanistiche, Piazza Dante Alighieri, 24, Catania 95124, Italy 4 Universidad Nacional Aut´onoma de M´ exico, Instituto de Investigaciones Antropol´ ogicas, Cto. Exterior, s/n Ciudad Universitaria, Ciudad de M´ exico 04510, Mexico 5 Parco Archeologico e Paesaggistico di Siracusa, Eloro, Villa del Tellaro e Akrai, Viale Teocrito 66, Siracusa 96100, Italy Abstract. As 3D tools become increasingly used in archaeology and cul- tural heritage management, best practices are continuously developing to mediate their adoption. As part of an effort to revalorize the archaeo- logical site of Heloros in southeastern Sicily, the authors have applied the concept of datafication to heuristically plan the approaches and objec- tives for its digitization. The process of datafication, i.e. the creation of new data through layered collection of natively digital and digitized legacy data, guided the collection of digital data aimed to consolidate archaeological and landscape data for the purposes of virtual reconstruc- tion and planning of future interventions. The process of datafication, used here for the first time in a Mediterranean context led to the dis- covery of unpublished information about the previously excavated site of Heloros. Three-dimensional data were captured using terrestrial laser scanning, aerial and handheld photogrammetry, and integrated into a Geographic Information System to investigate and record the ancient Greek city of Heloros and individual elements of the site. Digitized legacy data were compared with the natively digital data of the site collected in 2021 and used to create a Digital Terrain Model. Bespoke GIS visualiza- tions techniques were applied to identify as series of anomalies that were compared with legacy data. The preliminary results of this research led to the verification of hypotheses about the fortification system, previous excavation trenches, and the identification of possible further fortifica- tions and unpublished use-phases of the site. Keywords: Heloros · Greek Sicily · remote sensing · revalorization · datafication c  Springer Nature Switzerland AG 2023 J.-J. Rousseau and B. Kapralos (Eds.): ICPR 2022 Workshops, LNCS 13645, pp. 131–141, 2023. https://doi.org/10.1007/978-3-031-37731-0_11