Bridging the gap: An open-source gis+bim system for archaeological data.The case study of altinum, Italy

GIS tools in archaeology have become fundamental for professionals and researchers around the world. In recent years, the "3D revolution"has drastically changed archaeological practices and methods, including the use of GIS. This paper presents the results of a project aimed at building an integrated system for the management and study of archaeological data in 2D and 3D, connecting GIS to BIM. Building Information Modeling (BIM) is an innovative technology developed for architectural design and planning, and later adapted for cultural heritage and historic buildings (HBIM). More recently, it has been tested on archaeological sites. Some attempts have been made to connect landscape scale GIS projects with BIM models of individual buildings. However, these have not been applied specifically to archaeology thus far. Through the use of open-source software, a seamless workflow from data collection in GIS to 3D visualization and modeling in a native OpenBIM environment has been created. The paper illustrates this methodology with a case study about Altinum, a Roman city in northeastern Italy near Venice. The GIS component of the project manages the archaeological map of the city, while the OpenBIM application allows the virtual reconstruction of the sites. For the latter, the case of the ancient city-gate of Altinum is considered and explained.