Search results for "Photogrammetry"
showing 10 items of 142 documents
Registration of arbitrary multi-view 3D acquisitions
2013
International audience; To register 3D meshes representing smooth surfaces we track the 3D digitization system using photogrammetric techniques and calibrations. We present an example by digitizing a 800 mm x 600 mm portion of a car door. To increase the tracking accuracy the 3D scanner is placed in a cubic frame of side 0.5 m covered with 78 targets. The target frame moves in a volume that is approximately 1100 mm x 850 mm x 900 mm, to digitize the area of interest. Using four cameras this target frame is tracked with of an accuracy of 0.03 mm spatially and 0.180 mrad angularly. A registration accuracy between 0.1 mm and 2 mm is reached. This method can be used for the registration of mesh…
Radiometric and geometric evaluation of the capabilities of the new airborne digital photogrammetric sensors
2008
In this paper the theoretic and practical points of view about the applications of the modern digital airborne sensors in the photogrammetry and remote sensing fields are described. The first part of the paper describes the theoretic matter, the second one shows the first results regarding the carried out elaborations on an image of Palermo acquired by digital airborne sensor LH System ADS40. Besides the research has examined most of sides regarding the trilinear sensor and it has highlighted the capabilities and limitations respect to the traditional analogical system and the matricial CCD sensor.
GPS/INS Systems for compilation of digital large-scale orthophotos
2004
The paper describes the first results of a study, supported by an Italian research project “Integrated Inertial Positioning Systems in Aerial Photogrammetry” on the potential use of these techniques for production of digital large scale orthophotos. The study has been done with aerial photographs collected from two different flights executed in Sicily: the former, relating to the city of Palermo, at average scale of 1:9300; the latter, over the city of Catania, at average scale of 1:2000. For both flights the orthorectification was carried out by direct georeferencing methods and by traditional photogrammetric techniques, using ground control points surveyed by means GPS techniques and aeri…
Preserving Cultural Landscapes in South Africa: UAV Mapping of a Bokoni Archaeological Complex
2021
During the second year of the project “A social and spatial investigation at the Moxomatsi village”- Joint Mobility Projects: New Technologies for Social Science, ISARP 2018-20 - the work team of the University of Salerno (Department of Civil Engineering and Department of Cultural Heritage Sciences) was engaged in South Africa for the documentation of the Bokoni Archaeological Complex. Located in the present province of Mpumalanga, the Bokoni was a pre-colonial South African society, the research will be mainly focused on the study of agricultural settlements characterized by areas where densely walled settlements with roughly circular homesteads linked by walled roads are interspersed amon…
The new boundaries of digitization: from bim to parametric modelling
2022
The theme of digitization and documentation, which inevitably affects the fields of surveying and designing architecture and urban areas, is constantly innovated by the new digital technologies and new multimedia communication systems that allow us to acquire, analyze and disseminate the value of our historical heritage. Research in this field pushes us to overcome the limits imposed by tested technologies in order to extend the field of application in the surveying and representation of the increasingly complex challenges imposed by the needs of conservation and maintenance. This volume, which follows on from the three previous conferences of the “Digital & Documentation” cycle that to…
Multi sensor photogrammetric techniques for the documentation of the ruins of Temple G in Selinunte
2022
In the past two decades UAV have been increasingly used for the survey of wide areas. The chosen case study, the huge heap of ruins of the Temple G in Selinunte, demands a higher accuracy than that usually accepted for wide areas survey; nonetheless, the morphology of the ruins makes laser scanning survey inadequate to the purpose of the analysis and interpretation. The proposed methodology integrates SfM photogrammetry from UAV and action camera’s photos. A test on a specific area has evaluated the accuracy of photogrammetric survey through the comparison with laser scanning data.
Integrating topographic, photogrammetric and laser scanning techniques for a scan-to-bim process
2021
Abstract. The preservation of historic buildings can often be particularly difficult due to the lack of detailed information about architectural features, construction details, etc.. However, in recent years considerable technological innovation in the field of Architecture, Engineering, and Construction (AEC) has been achieved by the Building Information Modeling (BIM) process. BIM was developed as a methodology used mainly for new construction but, given its considerable potential, this approach can also be successfully used for existing buildings, especially for buildings of historical and architectural value. In this case, it is more properly referred to as Historic – or Heritage – Buil…
ARCHITECTURAL SURVEY TECHNIQUES FOR DEGRADATION DIAGNOSTICS. AN APPLICATION FOR THE CULTURAL HERITAGE
2021
Abstract. The great technological development in recent years in the field of architectural survey has made possible increasingly expeditious and less invasive investigations with the aim of acquiring a series of data related to the asset and fundamental for the protection of cultural heritage. In addition, the synergy between the various techniques represents an added value able, not only, to fill possible gaps and lacks arising from application limits of the instruments, but also to enhance the peculiarities of the same. This paper presents an integrated survey activity (range-based, image-based and IR thermography techniques) aimed at applying the combination and collaboration of multipl…
Latest developments in rock art recording: towards an integral documentation of Levantine rock art sites combining 2D and 3D recording techniques
2013
This paper presents a further step in the integral documentation of prehistoric rock art, combining 2D and 3D digital recording techniques. Image processing and digital enhancement techniques are an invaluable aid to obtain high quality and accurate 2D recordings, especially when working with faint motifs or complex superimpositions. But what constitutes a real breakthrough is the possibility of combining 2D digital tracings with metric 3D models, providing a whole set of metric outputs that improve our understanding of the motifs in their context and, at the same time, can be used to deliver accurate metric reproductions. The Levantine rock art at Cingle de la Mola Remigia (Ares del Maestr…
Automatic orientation and 3D modelling from markerless rock art imagery
2013
This paper investigates the use of two detectors and descriptors on image pyramids for automatic image orientation and generation of 3D models. The detectors and descriptors replace manual measurements and are used to detect, extract and match features across multiple imagery. The Scale-Invariant Feature Transform (SIFT) and the Speeded Up Robust Features (SURF) will be assessed based on speed, number of features, matched features, and precision in image and object space depending on the adopted hierarchical matching scheme. The influence of applying in addition Area Based Matching (ABM) with normalised cross-correlation (NCC) and least squares matching (LSM) is also investigated. The pipel…