Abstract. This paper deals with the 3D City Modelling specific procedure developed as a tool to support strategies for urban regeneration, within the framework of the B-ROAD research project.The B-ROAD research project, whose acronym stands for Below the Road, is developing urban design strategies for upcycling urban infrastructure residual pockets.The B-ROAD’s methodology is conceived as research by design as it is carried out by creating pilot scenarios, disclosing the latent and still unexpressed potential of these wasted areas and displaying their potential transformations, to turn them into precious resources for the contemporary city.The 3D City Modelling of the study area has proved to be essential and strategic yet often complex and critical as most of the spatial and architectural features of B-ROAD spaces, as well as their potential, cannot be detected nor represented through the traditional means of representation of urbanised land, as aerial survey-based representations, or GIS. Likewise, traditional, or even cutting-edge, survey techniques that can be used to acquire missing data are often costly and time-consuming, thus making it hardly impossible to achieve the purpose of extensive and deep knowledge of such a vast area. Thus, 3D City Modelling aimed at examining spaces and providing a final representation of pilot scenarios has been a crucial stage requiring a specific in-depth study.

Abstract. The use of spherical cameras (with a field of view of 360°) is becoming increasingly popular for photogrammetric applications characterised by the opportunity to capture entire scenes in a relatively short time.This potential may be even more interesting for the digitisation of complex areas where, in addition to geometry, time, cost and social context play an important role.This contribution is part of this field of investigation by describing two experiments conducted on the use of an inexpensive 360° camera, the Insta360 OneX2, for the expeditious survey of residual spaces below road junctions.The area under investigation is a node in the city of Naples (Italy) located in the eastern area, considered particularly significant for the interaction between the geographical and infrastructural system.Two different approaches are tested starting from the acquisition of the spherical photographic dataset: the traditional one by means of photogrammetric software and the more economical and user-friendly one by employing the Matterport Capture application. Pros and cons of the two approaches are discussed: the first experimental results are encouraged and support the validity of the approach for surveying complex urban spaces.