|Tipo di tesi||Tesi di dottorato di ricerca|
|Titolo||Aspetti metodologici per la conoscenza geometrica e l’analisi multi-temporale con sistemi a scansione laser in applicazioni ingegneristiche|
|Titolo in inglese||Methodological aspects for geometry investigations and multi-temporal analysis by means of laser scanning systems in engineering applications|
|Settore scientifico disciplinare||ICAR/06 - TOPOGRAFIA E CARTOGRAFIA|
|Corso di studi||Scuola di D.R. in HIGH MECHANICS AND AUTOMOTIVE DESIGN & TECHNOLOGY / MECCANICA AVANZATA E TECNICA DEL VEICOLO|
|Data inizio appello||2015-03-24|
|Disponibilità||Accessibile via web (tutti i file della tesi sono accessibili)|
Il presente lavoro di ricerca nasce nell’ambito delle più avanzate tecnologie della geomatica e si sofferma sulla definizione di un corretto approccio metodologico per la documentazione geometrica attraverso la tecnica laser scanning. In particolare è stato svolto un approfondito studio per la determinazione degli aspetti tecnici e metodologici fondamentali da conoscere e considerare per una corretta programmazione delle campagne di rilievo tridimensionale con tecnologia laser scanning, con particolare riferimento all’efficace progettazione di analisi multi-temporali in diversi contesti e campi applicativi.
This research, arising from practical application of state-of-the-art geomatic technology, seeks to define a sound methodology for geometric data capture using laser scanning techniques. In particular, it seeks to define technical and methodological criteria that must be considered to correctly program three-dimensional relief measurement campaigns with laser scanning technology, with emphasis on effective design of multi-temporal analysis in a variety of contexts and applications. There is limited experience in use of this technology to identify geometric variations between successive epochs (displacements and deformations), even internationally. The scientific community has focused recently on how best to carry out surveys and on which algorithms are most effective for multi-temporal analysis of survey data, an essential aspect in many engineering applications. Ever-increasing efficiency and capability of commercially-available instrumentation makes possible analysis and interpretation that was unobtainable only a few years ago. This research is in the field of applied geomatics, and specifically in Geomatic Engineering, a pioneering discipline on the international level with strong potential for rapid development, but which is still mostly unknown in Italy. Its aim is to identify the contexts and real-world cases in which the investigated methodologies were applied and validated, both for planning and execution of surveys and for processing and interpretation of the resultant data. Terrestrial Laser Scanning (TLS) systems are now widely available and used for many applications due to the speed with which they can acquire a large amount of data (points in space) with high resolution and accuracy. TLS systems are used for 3D measurements on sites affected by hydrogeological and landslide risks in the environmental field, for high-precision geometrical analysis on buildings in the civil engineering field, and for the study of the deterioration of monuments in conservation and cultural contexts. There are various types of laser scanners: in terrestrial applications at medium or long range (tens or hundreds of meters) measurements are performed by calculating time of flight or phase shift of the emitted pulse; however, in short range applications instruments exploit the principle of the forward intersection, hence the name triangulation. Each instrument has unique characteristics that make it suitable for a certain range of applications. This research covers the engineering applications of hydrological risk, structural survey, and damage analysis and for each application, proposes best practices in the selection and use of the various technical solutions available on the market.