摘要：Architectural structures are 3D volumes and their features, which are recognized in the field through archaeological investigation (stratigraphic, metric and formal data), are distributed within the three-dimensions. Stratigraphic wall analysis normally needs front elevations or photo-mosaic images to draw the boundaries between each Stratigraphic Unit (SU). The Stratigraphic 3D component is not recorded because it is not taken into account by these supporting documents. With the support of photo-modelling and stereophotogrammetry, instead, it is possible to record the perimeter and volume of each SU in 3D space and also obtain isomorphic reproductions of the detected object. These copies are high quality photo-textured models that provide a complete overview of architectural volumes and the close dimensional framework (length, depth and width) of mouldings and decorative architectural elements. Moreover, the coordinates of any point can be extracted from these models in order to obtain traditional charts (maps, sections, elevations and axonometric views, useful to understand the process of installation of building elements). The purpose of this paper is to describe different techniques capable of acquiring 3D data of wall stratigraphy in order to define new methods of documentation based on the use of photo-modelling and stereophotogrammetry. The data used for this research refer to excavated sites or high-preserved fabrics of different ages and functions such as the late medieval bell-tower of the basilica of San Severo (Classe, Ravenna), the modern tower of Monte Erno (FC) and the church of San Bartolomeo in Tipano (FC). Starting with these cases, in this article we explore some of the technical aspects of data processing like speed, measurement accuracy, information content and equipment cost.
