150 research outputs found
Progettazione e realizzazione di moduli in ambiente GIS per lo studio dell'accessibilità territoriale
No full textThis project has been developed within the First Degree Thesis in Environmental and Territory Engineering of Andrea Cervetto with cooperation of the “Comunità Montana Argentea”.
The main target of this work is the development of an open-source Geographic Information System (GIS) application as a tool for the planning and optimization of wilderness walking paths. It's based on the study of the wilderness accessibility that take into account the walking costs, on and off paths through the analysis about morphological parameters of terrain.
This methodology, creating in Bash scripting language, allows different functions available for users through a simple graphic interface. The modules realized, supply tools to plan mountains hut and design a new net of paths or specific tracks in mountain areas
Modulo in ambiente GIS-GRASS per lo studio dell'accessibilità territoriale in ambiente montano: applicazione alla Comunità Montana Argentea.
No full textThe present work has been developed under a thesis work in cooperation with the “Comunità Montana Argentea”. The GIS is used as a tool for the analysis, management and optimization of wilderness walking paths in relation to shelter’s location.
The procedure evaluates the accessibility to territory away from urban centres, calculating the walking costs on and off paths, by some scripts that analyse the morphological parameters of terrain deductible from Digital Terrain Model (DTM) as well as thematic maps affiliates. Because of a great number of parameters, particular importance is given to the testing and calibration phase, carried out by comparing the values evaluated with new implemented modules with values derived from commonly used algorithms and from other empirical surveys.
The module, written in a Bash language and available in an user-friendly and simple interface, represents a useful tool for planning the recovery and inclusion of shelters in the paths network and new connections to integrate new interesting points
3D reconstruction of the Pollera cave, Italy
No full textThe Pollera cave is situated in the region of Liguria, Italy, and it is the subject of a strategy aimed at improving and promoting tourism in the area. In this project, 3D laser scans of some of the more easily accessible cave rooms were needed to create multimedi products such as movies, images and scenes for 3D virtual tours, and to generae geocartographic products for tourist excursions. To achieve this, the cave was scanned using a Z+F IMAGER 5010 high-precision laser scanner. Surveying and data processing proved to be particularly difficult and costly due to the underground environment, but by using free and open-sourced software a fully textured 3D model was successfully generated.The Pollera cave is situated in the region of Liguria, Italy, and is the subject of a strategy aimed at improving and promoting tourism in the area. In this project, 3D laser scans of some of the more easily accessible cave rooms were needed to create multimedia products such as movies, images and scenes for 3D virtual tours, and to generate geocartographic products for tourist excursions. To achieve this, the cave was scanned using a Z+F IMAGER 5010 high-precision laser scanner. Surveying and data processing proved to be particularly diffi cult and costly due to the underground environment, but by using free and open-sourced software a fully textured 3D model was successfully generated
HIGH-PRECISION LASER SCANNING FOR CAVE TOURISM 3D Reconstruction of the Pollera Cave, Italy
No full textIl rilevamento di DTM per analisi morfodinamiche
No full textThe present work arises from the need to monitor an area of sufficiently limited extension through ground survey by means of traditional or GPS techniques, aimed at achieving a prescribed accuracy and, most of all, describing the ground in relation to the requested applications.
A typical application is the morphodynamic analysis of a braided river, namely a river consisting of more than one channel contributing to flow and sediment transport. Such channels are very unstable, so braided rivers pose difficult problems of river management. Fluvial engineers often need frequent and detailed surveys in order to monitor the motions of channels. Such need leads to onerous field measurements.
In the present work we investigate how to optimise the topographic survey of braided rivers, in the sense of reducing the number of topographic points that we have to survey, selecting their distribution such to reproduce at best the complex bed surface. Starting from synthetic DTMs, different survey points and different interpolation methods are tested in a didactic approach through GIS open source GRASS. Hence, we have derived useful indications on how to reproduce digital terrain models that describe satisfactorily the morphology of a braided river with the lowest effort.
The above approach has been applied to a field survey of a braided reach of Borbera River (AL)
River Survey Evolution by means of Autonomous Surface Vehicles
No full textLiguria (Italy) is one of the European regions where extreme events related to anthropogenic changes have had the greatest number of negative effects. In this area the use of suitable robots can improve monitoring the impact of anthropogenic pressure in wetland ecosystems. A recent bathymetry survey took place with an ASV named SWAMP that was specifically designed for the extremely shallow waters peculiar of rivers and inland waters. SWAMP was equipped with a single beam sonar protected inside the hull and performed a bathimetry in the area where Roja river flows not far from the Italy-France border. During the survey SWAMP proved to be easily transportable in a harsh environment and to be capable of working in extremely shallow water without any risk for sensors and propulsion and to be highly manoeuvrable in narrow space
Rilevamenti in tempo reale in prossimità dei confini di reti di stazioni permanenti GPS
No full textIl presente lavoro si propone di verificare le problematiche legate ai servizi di posizionamento GPS tramite correzioni differenziali in tempo reale offerti dalle reti di Stazioni Permanenti GPS nelle vicinanze dei propri confini, soprattutto in termini di affidabilità e di coerenza con soluzioni provenienti da reti confinanti. Sono state progettate due campagne di misura RTK in riferimento alle reti regionali per la Lombardia e il Piemonte; la prima nell'area circostante la stazione permanente di Varzi (Pv) facente parte della rete lombarda, la seconda nell'area circostante la stazione permanente di Alessandria appartenente alla rete piemontese.
L’analisi dei risultati è stata eseguita mettendo a confronto le diverse tipologie delle correzioni differenziali per il tempo reale, offerte dai gestori delle reti
Contribution of a Kinematic Station to the GNSS Network Solution for Real Time
No full textGNSS networks for real time compute differential corrections using undifferenced equations to model observations' biases.
The main goal of the present work is to analyse the contribution of the correlations in a network solution, due to some common parameters such as ephemeris or satellites' clocks. Some network simulations have been carried out considering undifferenced equations with different number of stations. In addition we investigate the opportunity to consider a multi-station with three joint antennas, instead of a single permanent station, to quantify the contribution that the increased correlations could provide in the estimation of the GNSS observations' biases and in the network design. The obtained results are compared with a solution computed with a Kalman filter, ad-hoc implemented to process a real data-set
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