scholarly journals Going from Analogue to Digital: A Study of Documentation Methods during an Excavation of the Neolithic Flint Mines at Pilbladet, Sweden

2021 ◽  
Vol 26 (1) ◽  
pp. 119-158
Author(s):  
Åsa Ottosson Berggren ◽  
Anders Gutehall
Keyword(s):  
3D Model ◽  
Digital Photography ◽  
Additional Research ◽  
Southern Sweden ◽  
Digital Mapping ◽  
Archaeological Interpretation ◽  
Archaeological Knowledge ◽  
Analogue To Digital ◽  
Digital Plan ◽  
Archaeological Excavations

The ‘digital turn’ in archaeology has resulted in documentation, analysis, visualization and repository requirements becoming increasingly digital in recent years. However, we are only at the beginning of understanding how the shift from analogue to digital affects archaeological interpretation, as attention has mainly been directed towards technological aspects. However, how archaeology is executed influences the production of archaeological knowledge, and additional research into digital practices and their consequences is needed. During the latest excavation in 2014 of the Neolithic flint mines of Södra Sallerup, in Malmö in southern Sweden, several recording methods were used to document the remains in plan, including hand drawing, digital mapping with GPS and digital photography using a camera mounted on a pole. The records were used to create both a digital plan as well as georeferenced orthophotos from a 3D model and from photomosaic. The aim was to produce a record comparable to previous documentation from decades of archaeological excavations of the flint mines in the area, as well as one that is up-to-date with today’s digital standards. The methods are described and their consequences for the archaeological results are discussed.

scholarly journals VERIFICATION OF POTENCY OF AERIAL DIGITAL OBLIQUE CAMERAS FOR AERIAL PHOTOGRAMMETRY IN JAPAN

2016 ◽  
Vol XLI-B1 ◽  
pp. 63-68 ◽  
Author(s):  
Ryuji Nakada ◽  
Masanori Takigawa ◽  
Tomowo Ohga ◽  
Noritsuna Fujii
Keyword(s):  
3D Model ◽  
3D Models ◽  
Aerial Photographs ◽  
Digital Cameras ◽  
Digital Mapping ◽  
Aerial Photogrammetry ◽  
Public Survey ◽  
Survey Accuracy ◽  
Left And Right ◽  
Simultaneous Adjustment

Digital oblique aerial camera (hereinafter called “oblique cameras”) is an assembly of medium format digital cameras capable of shooting digital aerial photographs in five directions i.e. nadir view and oblique views (forward and backward, left and right views) simultaneously and it is used for shooting digital aerial photographs efficiently for generating 3D models in a wide area. <br><br> For aerial photogrammetry of public survey in Japan, it is required to use large format cameras, like DMC and UltraCam series, to ensure aerial photogrammetric accuracy. <br><br> Although oblique cameras are intended to generate 3D models, digital aerial photographs in 5 directions taken with them should not be limited to 3D model production but they may also be allowed for digital mapping and photomaps of required public survey accuracy in Japan. <br><br> In order to verify the potency of using oblique cameras for aerial photogrammetry (simultaneous adjustment, digital mapping and photomaps), (1) a viewer was developed to interpret digital aerial photographs taken with oblique cameras, (2) digital aerial photographs were shot with an oblique camera owned by us, a Penta DigiCAM of IGI mbH, and (3) accuracy of 3D measurements was verified.

scholarly journals 3D DOCUMENTATION OF FRAIL ARCHAEOLOGICAL FINDS USING LOW-COST INSTRUMENTATION

2019 ◽  
Vol XLII-2/W17 ◽  
pp. 157-164
Author(s):  
V. Katsichti ◽  
G. Kontogianni ◽  
A. Georgopoulos
Keyword(s):  
Data Acquisition ◽  
3D Model ◽  
Low Cost ◽  
Laser Scanner ◽  
3D Models ◽  
The Other ◽  
3D Documentation ◽  
Hand Image ◽  
Archaeological Excavations ◽  
Suitable Processing

Abstract. In archaeological excavations, many small fragments or artefacts are revealed whose fine details sometimes should be captured in 3D. In general, 3D documentation methods fall into two main categories: Range-Based modelling and Image-Based modelling. In Range Based modelling, a laser scanner (Time of Flight, Structured light, etc.) is used for the raw data acquisition in order to create the 3D model of an object. The above method is accurate enough but is still very expensive in terms of equipment. On the other hand, Image-Based modelling, is affordable because the equipment required is merely a camera with the appropriate lens, and possibly a turntable and a tripod. In this case, the 3D model of an object is created by suitable processing of images which are taken around the object with a large overlap. In this paper, emphasis is given on the effectiveness of 3D models of frail archaeological finds originate from the palatial site of Ayios Vasileios in Laconia in the south-eastern Peloponnese, using low-cost equipment and methods. The 3D model is also produced using various, mainly freeware, hence low-cost, software and the results are compared to those from a well-established commercial one.

scholarly journals Photogrammetry (SfM) vs. Terrestrial Laser Scanning (TLS) for Archaeological Excavations: Mosaic of Cantillana (Spain) as a Case Study

2021 ◽  
Vol 11 (24) ◽  
pp. 11994
Author(s):  
Carmen Marín-Buzón ◽  
Antonio Miguel Pérez-Romero ◽  
Manuel J. León-Bonillo ◽  
Rubén Martínez-Álvarez ◽  
Juan Carlos Mejías-García ◽  
...  
Keyword(s):  
Laser Scanning ◽  
3D Model ◽  
Laser Scanner ◽  
Control Points ◽  
Ground Control Points ◽  
Accuracy And Precision ◽  
Restoration Work ◽  
Special Relevance ◽  
Archaeological Excavations

The discovery of a Roman mosaic from the 2nd century AD in Cantillana (Seville) generated interest and the need for exhaustive documentation, so that it could be recreated with real measurements in a 3D model, not only to obtain an exact replica, but with the intention of analyzing and studying the behavior of two main geomatics techniques. Thus, the objective of this study was the comparative analysis of both techniques: near object photogrammetry by SfM and terrestrial laser scanner or TLS. The aim of this comparison was to assess the use of both techniques in archaeological excavations. Special attention was paid to the accuracy and precision of measurements and models, especially in altimetry. Mosaics are frequently relocated from their original location to be exhibited in museums or for restoration work, after which they are returned to their original place. Therefore, the altimetric situation is of special relevance. To analyze the accuracy and errors of each technique, a total station was used to establish the real values of the ground control points (GCP) on which the comparisons of both methods were to be made. It can be concluded that the SfM technique was the most accurate and least limiting for use in semi-buried archaeological excavations. This manuscript opens new perspectives for the use of SfM-based photogrammetry in archaeological excavations.

scholarly journals Autoritet i proizvodnja arheološkog znanja

2016 ◽  
Vol 11 (3) ◽  
pp. 749
Author(s):  
Natalija Ćosić
Keyword(s):  
Material Culture ◽  
Professional Identity ◽  
Production Of Knowledge ◽  
The Past ◽  
Disciplinary Practice ◽  
Sources Of Authority ◽  
Archaeological Knowledge ◽  
The Times ◽  
Archaeological Ethnography ◽  
Archaeological Excavations

The discipline of archaeology is founded upon the interaction of various practices, in the network of individuals and institutions, jointly shaping and formulating the explanations of the past. The registered sites and material remains represent the places where undefined layers and physical structures are converted from heaps of dirt and discarded material into the knowledge of the past. From the perspective of production of knowledge and construction of facts about the times past, the archaeological excavations are not only a process of research. The production of archaeological knowledge, in the field and beyond, always takes place under specific circumstances, including not only the relations among professionals and institutions, but also the relations between material remains and the individuals “discovering” them and translating them into interpretations. Metaphorically speaking, in the complex relationship between archaeologists and material culture, an individual in the process of creating the knowledge of an object creates his/her own professional identity, while an object creates an archaeologist in the process of identification. The final outcome presents a chosen and formulated explanation about the past, stemming from a specific logic of disciplinary practice. However, the question arises: what or who decides which interpretations are more valid than the others, and who is in the position to declare an authentic interpretation of the excavated material. Thus the discussion enters the field of problematizing the concept of authority and its role in the production of archaeological knowledge. The analyses show that authority should not be understood as a definite source, periodically appearing and disappearing, but rather as an achievement of social and cultural interactions and changes. The theoretical grounds for the research of authority is formulated based upon Foucault’s interpretation of relation between power and knowledge. The axis for identification of authority in disciplinary practices is determined by the chosen categories of executive, epistemic, and intellectual authority, coupled with archaeological ethnography. The suggested development of the theoretical framework is aimed to secure the tools for considering the shapes and sources of authority in archaeology and its role in the production of archaeological knowledge of the past.

Assembling archaeological pedagogy. A theoretical framework for valuing pedagogy in archaeological interpretation and practice

2014 ◽  
Vol 21 (2) ◽  
pp. 197-216 ◽  
Author(s):  
Hannah Cobb ◽  
Karina Croucher
Keyword(s):  
Theoretical Framework ◽  
Assemblage Theory ◽  
Teaching And Research ◽  
Archaeological Practice ◽  
Archaeological Interpretation ◽  
Theoretical Perspectives ◽  
Pedagogic Research ◽  
Archaeological Knowledge ◽  
Current Practices

AbstractDrawing on relational theoretical perspectives in archaeological discourse, this paper considers how we can address the undervaluation of pedagogy and pedagogic research in archaeology. Through examining the relationships between fieldwork, teaching, and research, in light of Ingold's concept of the meshwork and DeLanda's assemblage theory, the division between teaching and research is undermined, and students and pedagogy are recentred as fundamental to the production of archaeological knowledge. This paper provides a theoretical grounding for resituating our current practices, suggests practical means for change, and highlights the benefit to the archaeological discipline arising from a revaluation of archaeological pedagogic research and an enmeshed understanding of archaeological practice.

scholarly journals VERIFICATION OF POTENCY OF AERIAL DIGITAL OBLIQUE CAMERAS FOR AERIAL PHOTOGRAMMETRY IN JAPAN

2016 ◽  
Vol XLI-B1 ◽  
pp. 63-68
Author(s):  
Ryuji Nakada ◽  
Masanori Takigawa ◽  
Tomowo Ohga ◽  
Noritsuna Fujii
Keyword(s):  
3D Model ◽  
3D Models ◽  
Aerial Photographs ◽  
Digital Cameras ◽  
Digital Mapping ◽  
Aerial Photogrammetry ◽  
Public Survey ◽  
Survey Accuracy ◽  
Left And Right ◽  
Simultaneous Adjustment

Digital oblique aerial camera (hereinafter called “oblique cameras”) is an assembly of medium format digital cameras capable of shooting digital aerial photographs in five directions i.e. nadir view and oblique views (forward and backward, left and right views) simultaneously and it is used for shooting digital aerial photographs efficiently for generating 3D models in a wide area. <br><br> For aerial photogrammetry of public survey in Japan, it is required to use large format cameras, like DMC and UltraCam series, to ensure aerial photogrammetric accuracy. <br><br> Although oblique cameras are intended to generate 3D models, digital aerial photographs in 5 directions taken with them should not be limited to 3D model production but they may also be allowed for digital mapping and photomaps of required public survey accuracy in Japan. <br><br> In order to verify the potency of using oblique cameras for aerial photogrammetry (simultaneous adjustment, digital mapping and photomaps), (1) a viewer was developed to interpret digital aerial photographs taken with oblique cameras, (2) digital aerial photographs were shot with an oblique camera owned by us, a Penta DigiCAM of IGI mbH, and (3) accuracy of 3D measurements was verified.

The mensuration of interfaces

1992 ◽  
Vol 50 (1) ◽  
pp. 216-217
Author(s):  
W.M. Stobbs
Keyword(s):  
Electron Microscopy ◽  
50Th Anniversary ◽  
Numerical Data ◽  
Industrial Applications ◽  
Dynamical Theory ◽  
Large Strains ◽  
Reasonable Approach ◽  
Lattice Resolution ◽  
Analogue To Digital ◽  
The Way

I do not have access to the abstracts of the first meeting of EMSA but at this, the 50th Anniversary meeting of the Electron Microscopy Society of America, I have an excuse to consider the historical origins of the approaches we take to the use of electron microscopy for the characterisation of materials. I have myself been actively involved in the use of TEM for the characterisation of heterogeneities for little more than half of that period. My own view is that it was between the 3rd International Meeting at London, and the 1956 Stockholm meeting, the first of the European series , that the foundations of the approaches we now take to the characterisation of a material using the TEM were laid down. (This was 10 years before I took dynamical theory to be etched in stone.) It was at the 1956 meeting that Menter showed lattice resolution images of sodium faujasite and Hirsch, Home and Whelan showed images of dislocations in the XlVth session on “metallography and other industrial applications”. I have always incidentally been delighted by the way the latter authors misinterpreted astonishingly clear thickness fringes in a beaten (”) foil of Al as being contrast due to “large strains”, an error which they corrected with admirable rapidity as the theory developed. At the London meeting the research described covered a broad range of approaches, including many that are only now being rediscovered as worth further effort: however such is the power of “the image” to persuade that the above two papers set trends which influence, perhaps too strongly, the approaches we take now. Menter was clear that the way the planes in his image tended to be curved was associated with the imaging conditions rather than with lattice strains, and yet it now seems to be common practice to assume that the dots in an “atomic resolution image” can faithfully represent the variations in atomic spacing at a localised defect. Even when the more reasonable approach is taken of matching the image details with a computed simulation for an assumed model, the non-uniqueness of the interpreted fit seems to be rather rarely appreciated. Hirsch et al., on the other hand, made a point of using their images to get numerical data on characteristics of the specimen they examined, such as its dislocation density, which would not be expected to be influenced by uncertainties in the contrast. Nonetheless the trends were set with microscope manufacturers producing higher and higher resolution microscopes, while the blind faith of the users in the image produced as being a near directly interpretable representation of reality seems to have increased rather than been generally questioned. But if we want to test structural models we need numbers and it is the analogue to digital conversion of the information in the image which is required.

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