The analytical function of 3D data beyond visualisation and aesthetics has been a well-discussed issue in archaeological literature. Several recent projects have proposed case studies and workflows...Show moreThe analytical function of 3D data beyond visualisation and aesthetics has been a well-discussed issue in archaeological literature. Several recent projects have proposed case studies and workflows that implement three-dimensional data in 3D GIS software, yet few have truly utilised 3D modelling as a valued part of the analytical process. This begs the question, is there an added value of 3D approaches over traditional GIS, and what kinds of analytical possibilities does 3D documentation provide? This project aims to address these questions by integrating all available site datasets in a single, ‘living’ 3D GIS database which can be accessed and edited either in the ‘back end’ SQL database or the ‘front end’ 3D GIS. Furthermore, this project integrates 3D models created by structure-from-motion photogrammetry and establishes a number of useful analytical tools for working with three-dimensional spatial data, such as using artefact clusters to determine the function of space, and to comment on the taphonomic processes of the site. This project introduces the workflow for a fully integrated, interoperable database using 3D GIS, whereby three-dimensional data can be stored, viewed, and analysed alongside traditional GIS components and relevant site data such as (but by no means limited to) photographs, published related literature, and field notes. The project utilises the data from trenches B and H at Dhaskalio, Greece, excavated between 2016 and 2018. This site presented an ideal case study for the incorporation of 3D models as the project aimed to use an entirely digital recording system with photogrammetric models taken of every stratigraphic layer excavated and each architectural feature on site. This approach presents an advantageous use of 3D data in the intra-site interpretation processes.Show less
Advances in digital recording technology make it possible to document three-dimensional data during excavation. Yet this opens up the question: what do we do with this data? Is there an added value...Show moreAdvances in digital recording technology make it possible to document three-dimensional data during excavation. Yet this opens up the question: what do we do with this data? Is there an added value to recording 3D data that exceeds traditional 2D drawing approaches? Various 3D GIS workflows have been introduced over the years, yet little research has been done exploring the analytical possibilities of this approach. This thesis presents an effective workflow for creating a vector-based 3D GIS model that is capable of operating in the four subsystems of GIS: data entry, data storage, analysis, and visualization. Three excavation trenches from the Chalcolithic site of Chlorakas-Palloures, Cyprus are modeled using TS spatial data and 3D photogrammetry models. Moreover, three methods are introduced for modeling the volume of stratigraphic units using the capabilities of Esri ArcScene. This approach presents a significant advantage over 2D plan and section drawings in regards to stratigraphic analysis. The excavation database can be joined within the 3D GIS environment and easily queried, thus creating a complete 3D spatial database of all excavated materials. Using this method, it is possible to find spatial correlations between units in trenches that may have been excavated at different times. Furthermore, unit relations identified in the field can be visualized and verified in an intuitive, user-friendly interface. Along with being able to depict features and materials found within the interior of the trench, models can be cross-sectioned at any angle and in any direction to show the stratigraphic sequence. This is particularly helpful in aiding in the stratigraphic studies of Chalcolithic sites in Cyprus which have characteristically shallow occupation layers and are subject to extensive post-depositional processes. Stratigraphic analysis of the modeled trenches provides evidence of multiple occupation phases at the site, thus supporting the idea of dynamic settlement patterns during the Late Chalcolithic period in Cyprus. However, the ability to create a 3D GIS model is predicated on the quality and type of data recorded in the field. Volumetric modeling methods showed promise for depicting certain types of features, yet these must be improved in order to accurately represent the volume of all excavated units. An ideal documentation method is introduced that addresses these deficiencies and presents a means of capturing the volumetric data needed for creating a true 3D GIS model for stratigraphic analysis.Show less
