1,721,070 research outputs found
Production of DTM quality by TLS Data
Full text linkA procedure of calculation and experimentation addressed to a DTM extraction by TLS data has been implemented. The validation of elevation values has been realized by integrating the data collected with classical topographical and GPS observations. The results obtained allowed the assessment of the appropriate and simplified procedure for the determination of the DTM using laser technology and the possibility to improve and verify the attainable accuracy of the altitude plane.
The experimental outputs have been compared with those produced by commercial software. The difference obtained is primarily concerned with the conceptual scheme applied in the definition of the grid in the algorithm of interpolation and obtainable accuracy. Moreover, after obtaining the grid by topographic survey, characterized by a high precision, it is possible to verify its accuracy
RILIEVI FOTOGRAMMETRICI E TLS FINALIZZATI ALL’INCIDENTISTICA STRADALE
No full textUn settore di grande interesse sviluppato negli ultimi anni è quello del rilievo finalizzato alla ricostruzione della dinamica di un incidente stradale, il cui compito risulta talvolta delicato e decisivo, basti pensare all’ambito giudiziario, nel quale sono coinvolti aspetti sociali ed economici, oltre che penali. Considerando il carattere multidisciplinare dell’attività di ricostruzione, emerge la necessità di una elevata specializzazione e competenza di esperti che ne effettuino le ricostruzioni.
Nell’ambito del rilievo di un incidente stradale l’Ingegnere Forense, in qualità di Consulente Tecnico, ha ad oggi la possibilità di ricostruire la dinamica dell’incidente servendosi di tecnologie avanzate, le quali possono rendere le operazioni di rilievo più precise e veloci. Tra le metodologie che hanno trovato larga diffusione vi è l’integrazione tra la tecnica di rilievo Laser Scanning terrestre (TLS) e la fotogrammetria terrestre.
L’applicazione condotta consiste nel rilievo di un incidente stradale simulato tra una Toyota Yaris ed una Fiat Seicento presso il Politecnico di Bari. Le analisi condotte hanno evidenziato i vantaggi, ma anche gli svantaggi delle tecniche adottate per il rilievo e la ricostruzione dell’incidente stradale. Dall’analisi condotta è emersa la possibilità di risalire al veicolo che ha prodotto le tracce sull’asfalto, alla sua velocità di marcia, all’ambientazione del sinistro, nonché la quantificazione del danno provocato
Thermal monitoring using an ASTER image
No full textThe research is focused on the study of the applicability of remote sensing techniques (specifically using ASTER data) for marine environmental analysis, relative to the determination of the surface temperatures. Using a multitemporal approach, two images (classified as level-1B), acquired in August 2000 and in 2005, were considered. The thermal maps were realized by means of the emissivity spectral normalization method, defining the thermal gradients in the area under investigation. The spatial and temporal anomalies related to the temperature distribution were highlighted; these anomalies represent an important parameter for the identification of probable groundwater pollution and soil contamination. To define the map of the surface temperature using thermal infrared ASTER channels, a numerical model dedicated to ASTER data was implemented during the experimentation. This model is based on the principle of interpolation of the type "least square interpolation (linear)," and it implies a reduction in the number of unknowns to obtain an acceptable solution to the problem. This experimental model has provided good results in the phase of implementation and in the tests on a synthetic image that were simulated in the laboratory. However, further verifications and modifications are necessary for the processing of real ASTER images
Terrestrial LiDAR survey of archaeological site for prototyping
No full textUnder the LEADER + Puglia 2000/2006 project, the Community Initiative Programme aimed to promote the integrated,
endogenous and sustainable development of rural areas and enhancement of specific experiences with the external territories. A
terrestrial lidar survey of a protohistoric settlement dating from the period between the Bronze Age to the Iron Age (XVIII-VIII
century B.C.) has been conducted. The possibility to exploit, and make available at the same time, this very perishable settlement
(sandy site) took a survey of high detail aimed to the realization of a copy of the excavation to be placed in situ. Given the
complexity, for some areas, such as the furnace, an integration of lidar data with those from photogrammetric technique was
necessary. The integrated survey allowed to return a 3D numerical model aimed at the next step of prototyping in 1:1 scale
Ricostruzione tridimensionale per l'analisi del restauro della Chiesa di Cristo la Selva nella gravina di Matera
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