1,721,815 research outputs found
Presentación Dr. Gustavo Chiabrando Jornadas Abiertas UNC 2018-2028
No full textFil: Chiabrando, Gustavo. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas; Argentina.Panel: “Hacia una nueva gobernanza”. Tema: Estructura orgánica: relación entre los niveles de gestión y administrativos.Fil: Chiabrando, Gustavo. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas; Argentina
Disertación Dr. Gustavo Chiabrando en las Jornadas Abiertas UNC 2018-2028 "Haciendo posible la Universidad que queremos"
No full textFil: Chiabrando, Gustavo. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas; Argentina.Panel: “Hacia una nueva gobernanza”. Tema: Estructura orgánica: relación entre los niveles de gestión y administrativos. Decano Facultad de Ciencias Químicas UNC. Doctor en Ciencias Químicas.Fil: Chiabrando, Gustavo. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas; Argentina
Archaeological site monitoring: UAV photogrammetry can be an answer
No full textDuring archaeological excavations it is important to monitor the new excavated areas and findings day by day in order to be able to plan future excavation activities. At present, this daily activity is usually performed by using total stations, which survey the changes of the archaeological site: the surveyors are asked to produce day by day draft plans and sections which allow archaeologists to plan their future activities. The survey is realized during the excavations or just at the end of every working day and drawings have to be produced as soon as possible in order to allow the comprehension of the work done and to plan the activities for the following day. By using this technique, all the measurements, even those not necessary for the day after, have to be acquired in order to avoid a ‘loss of memory'. A possible alternative to this traditional approach is aerial photogrammetry, if the images can be acquired quickly and at a taken distance able to guarantee the necessary accuracy of a few centimeters. Today the use of UAVs (Unmanned Aerial Vehicles) can be considered a proven technology able to acquire images at distances ranging from 4 m up to 20 m: and therefore as a possible monitoring system to provide the necessary information to the archaeologists day by day. The control network, usually present at each archaeological site, can give the stable control points useful for orienting a photogrammetric block acquired by using an UAV equipped with a calibrated digital camera and a navigation control system able to drive the aircraft following a pre-planned flight scheme. Modern digital photogrammetric software can solve for the block orientation and generate a DSM automatically, allowing rapid orthophoto generation and the possibility of producing sections and plans. The present paper describes a low cost UAV system realized by the research group of the Politecnico di Torino and tested on a Roman villa archaeological site located in Aquileia (Italy), a well-known UNESCO WHL site. The results of automatic orientation and orthophoto production are described in terms of their accuracy and the completeness of information guaranteed for archaeological site excavation managemen
Uno sguardo dall'alto sul territorio costruito
No full textL'acquisizione di immagini digitali mediante velivoli a pilotaggio remoto (droni) per il rilevamento del territorio e dell'edificato è una procedura ormai affermata (Chiabrando et al, 2013 - Gerke 2012) che, potenzialmente permette di documentare, in modo rapido, completo ed economico, il paesaggio urbano e rurale da un punto di vista non usuale né convenzionale. L'efficienza di questa tecnologia viene ulteriormente accresciuta grazie all'utilizzo combinato di algoritmi di image processing (SemiGlobal Matching, SIFT, Structure-from-Motion, …) che permettono di estrarre in modo quasi automatico informazioni metriche tridimensionali (nuvole di punti e modelli tridimensionali) con precisioni/accuratezze controllate utili per generare prodotti cartografici finali quali modelli altimetrici (Dense Digital Surface Model, DDSM) e ortofoto ordinarie e di precisione, ma anche solide mediante la fusione con il DDSM (Chiabrando et al, 2013b). Per assicurare l'efficacia di questi strumenti e metodi sono state svolte numerose verifiche operative in un contesto rurale mediante i droni disponibili presso il laboratorio di Fotogrammetria, Geomatica e GIS del Politecnico di Torino e i numerosi software commerciali e freeware che negli ultimi anni si sono diffusi e affermati tra gli operatori. A titolo esemplificativo, in questo contributo verranno descritti i risultati svolti su un caso studio in un contesto costruito (anche se completamente disabitato), acquisito prima dell'entrata in vigore degli attuali regolamenti nazional
New instruments and technologies for Cultural Heritage survey: full integration between point clouds and digital photogrammetry
No full textIn the last years the Geomatic Research Group of the Politecnico di Torino faced some new research topics about new instruments for point cloud generation (e.g. Time of Flight cameras) and strong integration between multi-image matching techniques and 3D Point Cloud information in order to solve the ambiguities of the already known matching algorithms. ToF cameras can be a good low cost alternative to LiDAR instruments for the generation of precise and accurate point clouds: up to now the application range is still limited but in a near future they will be able to satisfy the most part of the Cultural Heritage metric survey requirements. On the other hand multi-image matching techniques with a correct and deep integration of the point cloud information can give the correct solution for an "intelligent" survey of the geometric object break-lines, which are the correct starting point for a complete survey. These two research topics are strictly connected to a modern Cultural Heritage 3D survey approach. In this paper after a short analysis of the achieved results, an alternative possible scenario for the development of the metric survey approach inside the wider topic of Cultural Heritage Documentation is reporte
Esperienze didattiche e approfondimenti sui temi dell’HBIM e della realtà virtuale
No full textQuesto contributo ha il ruolo di riferire di una interessante esperienza didattica e di altre due attività di studio svolte nell’ambito di tesi di laurea, ciascuna originata dallo stage didattico realizzato dal team studentesco DIRECT del Politecnico di Torino a Tolentino, finalizzato al rilievo 3D del complesso conventuale.
La prima esperienza è legata al workshop di “Fotogrammetria digitale e scansioni 3D per il rilievo di beni culturali” (a.a. 2016-17), coordinato da Nannina Spanò e Filiberto Chiabrando. Gli approfondimenti legati alle tesi di laurea riguardano nel primo caso le relazioni tra la modellazione 3D dai metodi reality based per sviluppare applicazioni di virtual reality (Carla Borriello), mentre il secondo la strutturazione di un HBIM (Heritage Building Information Modelling) che per definizione si origina anch’esso da nuvole di punti di natura fotogrammetrica o laser scanning (Raffaella Stano)
Generation of large scale numeric cartography with digital photogrammetric camera: the case of Ilidza-Sarajevo (BiH)
No full textSensors for 3D Imaging: Metric Evaluation and Calibration of a CCD/CMOS Time-of-Flight Camera
No full text3D imaging with Time-of-Flight (ToF) cameras is a promising recent technique which allows 3D point clouds to be acquired at video frame rates. However, the distance measurements of these devices are often affected by some systematic errors which decrease the quality of the acquired data. In order to evaluate these errors, some experimental tests on a CCD/CMOS ToF camera sensor, the SwissRanger (SR)-4000 camera, were performed and reported in this paper. In particular, two main aspects are treated: the calibration of the distance measurements of the SR-4000 camera, which deals with evaluation of the camera warm up time period, the distance measurement error evaluation and a study of the influence on distance measurements of the camera orientation with respect to the observed object; the second aspect concerns the photogrammetric calibration of the amplitude images delivered by the camera using a purpose-built multi-resolution field made of high contrast target
Orthophoto and Map Generation by digital photogrammetric camera Leica ADS 40. The case of Sarajevo (BiH)
No full textSilicon nanowire-based circuit: fabrication, characterization and simulation
No full textAn intense effort in nanofabrication and measurement of silicon nanowire (SiNW) devices has been profounded at INRiM in the last ten years, for different metrological applications ranging from current and voltage standards, quantum electronics, sensing and biosensing. All these activities are currently developed at Nanofacility Piemonte, a Laboratory of Electromagnetism Division, in the Quantum Metrology group, and more recently in cooperation with the Electronics and Telecommunications Department of Politecnico di Torino. The major objectives of my Ph.D. program was the fabrication of silicon nanowires, the electrical characterization of a single NW and the development of a method to simulate its behaviour in a complex electronic circuit. First two objectives were pursued at INRiM, whereas the ``computational'' part was carried out in the Department of Electronics and Telecommunications (DET) at the Politecnico. A protocol of fabrication has been drafted so as to obtain a sample of ordered nanowires with the same geometric and structural properties; this has been possible through the exploitation of the properties of self-assembling nanospheres of polystyrene. These nanowires were manipulated in order to obtain a device that would allow the analysis of the electrical characteristics of a single nanowire. In parallel, it has been provided a Spice method for simulation of electronic circuits that can use data tables from measurements or from literature works, or models too
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