1,721,031 research outputs found
High accuracy images and range based acquiring for artistic handworks 3D-models
Full text linkThe research topics and the applications in the Geomatic area are often connected to the land knowledge and management or to human artefacts usually studied and analyzed from expert of other areas. When these subjects are a part of the Cultural Heritage the survey methodology for the documentation and the knowledge need to consider the final users (belong to different disciplines), in order to realize correct descriptive products suitable for all the actors involved in the preservation and the safeguard of the Cultural Heritage. During the last decade one of the important aim related to the cooperation between the Geomatics group of Politecnico di Torino and the experts working on archaeological sites is to join the new Geomatic methodology and techniques in order to realize documents and products, usable by the specialists, aimed to the archaeological site knowledge and documentation. The past applications were focused on the ancient city, from the urban scale through the archaeological evidences up till the architectural elements. The paper deal with the last experiences of the research group relating to two important archaeological objects. In particular the archaeological artefacts are figurative relief featured by small dimension, carved in the marble and belonging to two architectural elements; the subjects are two theatrical masks, one comical featured and the other tragical. In order to aid and support other analyses involving restoration strategies one of the goals of the last expedition was the documentation, the survey and modelling of the artefacts. According to the complex shape of the theatrical masks, and in order to obtain all the information requested for a correct survey documentation, a triangulation-based LiDAR system was employed (HandyScan 3D- model HZ). Moreover, since the LiDAR survey was performed on the more complex decorated surface (theatrical masks) in order to achieve a complete 3D model of the marble blocks a photogrammetric survey was realized. In the paper some topics are going to be described, highlighting advantages coming from multi-sensor data fusion techniques, both for obtaining multi-scale models and for general accuracy improvement. Some discussed topics are: The acquisition phases and the obtained results of the 3D HandyScan survey, the photogrammetric processing steps and the realized products, the assembling and integration of the different kinds of data, the 3D representation and the photorealistic modeling phases
OBLIQUE IMAGES and DIRECT PHOTOGRAMMETRY with A FIXED WING PLATFORM: FIRST TEST and RESULTS in HIERAPOLIS of PHRYGIA (TK)
Full text linkThe complex archaeological site documentation benefits for a long time now from the aerial point of view and remote sensing methods. Moreover, the recent research on UAV photogrammetry platform equipment and flight planning actively contribute in this sense for a scaling improvement and cost-benefits balance. Frequently, the experiences on articulated topographic profiles in archaeological excavations require not only a multi-sensor approach but also and above all a multiscale one. According to this line, in a general time-cost ration framework, the geometric content of the generated DSMs should be complete of nadir and oblique point of view for the accurate 3D reconstruction of both upstanding buildings and excavations. In the same way, also the radiometric content closely depends on sensor payload quality and is strictly affected by excavation site condition, related to the site material and light. In this research, carried out in the impressive archaeological site of the ancient city of Hierapolis in Phrygia (Turkey) in the autumn 2019 campaign, the main goal was to evaluate and validate the overall performance of a novel UAV fix-wing ultralight platform with onboard GNSS receiver for RTK/PPK processing of cameras positioning and with the possibility of oblique images capturing. The expected contribute in terms of the acquisition, processing time, radiometric enhancement and geometry 3D reconstruction will be explored with preliminary test and outcomes, and with the results of the high-scale DSM and orthoimage generation of the complete Hierapolis site
ANCYRA PROJECT 2008 - RILIEVO E RAPPRESENTAZIONE DELL'AREA ARCHEOLOGICA DEL TEMPIO DI AUGUSTO AD ANKARA
No full textPhotogrammetric underwater and UAS surveys of archaeological sites: the case study of the Roman shipwreck of Torre Santa Sabina
Full text linkThe 2020 underwater archaeological research in the inlet of Torre Santa Sabina - Baia dei Camerini (Municipality of Carovigno,
Brindisi, Italy) represented the first phase of the pilot intervention of the Interreg Italia-Croatia UnderwaterMuse project. The project
aims to enhance and make accessible the vast underwater heritage of the areas involved; this will be done by creating submerged
archaeological parks and using virtual reality's narrative and communicative tools and platforms. During the 2020 campaign, different
survey activities were carried out using several techniques and methodology to produce the area's multi-scale documentation. First of
all, the entire stretch of coast was mapped with UASs (Uncrewed Aerial Systems) flights to reconstruct the coastal landscape in various
phases. Furthermore, an underwater photogrammetric survey carried out by expert scuba divers has been achieved in the wreck's aft
area (the site analyzed during the 2020 excavation activities). The fruitful synergy between the various actors involved and the support
of the territory and the community has allowed the achievement of this campaign's objectives, preliminary to the broader and more
articulated intervention foreseen for the following year
Uav direct georeferencing approach in an emergency mapping context. the 2016 central Italy earthquake case study
Full text linkUtilizzo di sistemi GIS per lo studio della “temporaneità” nei territori post-sisma del Centro Italia
Full text linkDOCUMENTATION OF COMPLEX ENVIRONMENTS IN CULTURAL HERITAGE SITES. A SLAM-BASED SURVEY IN THE CASTELLO DEL VALENTINO BASEMENT
Full text linkUnderground Built Heritage (UBH) stands out among the existing Cultural Heritage sites as a peculiar scenario. The assets belonging to this type of heritage are typically difficult to manage, exploit, and promote because of a lack of knowledge and documentation. The challenges in documenting built heritage are many and wide-ranging, and the main need must be to provide an accurate and appropriate representation of the surveyed area and its geometric features without employing time-consuming processes. Mobile Mapping Systems (MMSs) are nowadays trending technologies for the geomatics community, proving to be a useful alternative to traditional surveying techniques when taking time and cost constraints into account.
The paper focuses on the use of an MMS, the STONEX® X120GO SLAM Laser Scanner system, in documenting a portion of the Castello del Valentino, an articulated and complex architecture located in Turin (Italy). The underground floor of the castle, due to its complexity in terms of accessibility and the challenge it poses for the documentation approach, was chosen as a case study to assess the STONEX® X120GO's capabilities in terms of portability of the instrument, speed of acquisition, as well as completeness and accuracy of the acquired dataset. The results obtained using the MMS technique have been compared to and validated using data from a TLS (Terrestrial Laser Scanner) survey used as a ground reference. The results and considerations reported in this paper demonstrate that MMSs can accurately and completely depict built spaces and their main characteristics and have substantial potential in mapping complex assets
Modelli 3D densi tra esperienze didattiche e ricerche di soluzioni fruibili
Full text linkLe innumerevoli esperienze di documentazione metrica dei siti archeologici e dei beni culturali hanno ormai evidenziato quanto oggi sia opportuno nella fase di rilievo metrico prevedere l’integrazione di metodi differenti e multi-sensore che rispondano efficacemente alle esigenze specifiche che man mano si presentano nel corso delle fasi di documentazione tenendo conto anche dell’importanza dell’utilizzo di metodi quanto più possibile a basso costo rendendo il processo di rilevamento e fornitura dei dati maggiormente sostenibile.
Tali obiettivi sono stati perseguiti ad Aquileia sia per quanto riguarda il rilievo metrico alla scala archeologica delle emergenze di scavo, sia lo era stato anche per la documentazione a scala territoriale
DEEP LEARNING FOR AUTOMATIC BUILDING DAMAGE ASSESSMENT: APPLICATION IN POST-DISASTER SCENARIOS USING UAV DATA
Full text linkDuring the last few years, the technical and scientific advances in the Geomatics research field have led to the validation of new mapping and surveying strategies, without neglecting already consolidated practices. The use of remote sensing data for damage assessment in post-disaster scenarios underlined, in several contexts and situations, the importance of the Geomatics applied techniques for disaster management operations, and nowadays their reliability and suitability in environmental emergencies is globally recognized. In this paper, the authors present their experiences in the framework of the 2016 earthquake in Central Italy and the 2019 Cyclone Idai in Mozambique. Thanks to the use of image-based survey techniques as the main acquisition methods (UAV photogrammetry), damage assessment analysis has been carried out to assess and map the damages that occurred in Pescara del Tronto village, using DEEP (Digital Engine for Emergency Photo-analysis) a deep learning tool for automatic building footprint segmentation and building damage classification, functional to the rapid production of cartography to be used in emergency response operations. The performed analyses have been presented, and the strengths and weaknesses of the employed methods and techniques have been outlined. In conclusion and based on the authors' experience, some operational suggestions and best practices are provided and future research perspectives within the same research topic are introduced
Challenging multi-sensor data models and use of 360 images. The Twelve Months Fountain of Valentino park in Turin
Full text linkThe cultural heritage and the ways in which it is today studied and analysed as well as disseminated and enhanced for the purposes of conservation, requires high attention in the choice of 3D survey and modelling methods. This manuscript investigates the possible integrations and fusion of methods and data, among the vast availability of image and range based systems, especially in the sphere of low cost techniques, which in the context of heritage documentation makes the whole and complex process of conservation more sustainable. The investigation is carried out on a historical fountain that includes a quantity of cultural values and the need to document its context: its location in the historical Valentino of Turin park, its architectural values and the geometry of the complex typically related to the tastes of the late XIX century that consist in the extreme refinement of the statuary complexes and the underground portion with the technological equipment for the activation of the water games. Basically, it will be possible to appreciate solved issues and permanent criticalities derived from the integration of close range and UAV photogrammetry techniques in addition to the LiDAR survey, both classic from a fixed position, and in the portable scanner mode, based on SLAM technology
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