Francesco Mugnai

Francesco Mugnai
European Commission | ec · Joint Research Centre (JRC)

PhD

About

45
Publications
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879
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Publications

Publications (45)
Article
Full-text available
Comparing photogrammetric performances of four user-grade unmanned aircraft systems (UAS) is the main aim of this paper. This study investigates what is the more suitable UAS for specific applications considering the required scale factor, such as for architectural, environmental and restoration purposes. Some photogrammetric surveys were conducted...
Article
This paper shows results of comparing performances of four unmanned aircraft systems (UAS) in terms of photogrammetric survey’s quality. This study aims to investigate what is the more suitable UAS for specific applications considering the required scale factor, such as for architectural, environmental, and restoration purposes. A series of photogr...
Article
Full-text available
The paper addresses a relevant subject in structural health monitoring for civil engineering applications such as bridges or other large structures. Experimental laboratory program on the accuracy and precision of remote displacement measurements was reported. Could an onboard optical camera of a Total Station (Image-Assisted Total Station (IATS) L...
Preprint
This paper shows the results of applying high-resolution Unmanned Aircraft System (UAS) photogrammetric surveying on a large landslide. A real case study, where permanently installing GCPs could be complex, where natural shaped and formed land pose severe limitations in deploying ground targets with optimal geometric configuration. We analysed perf...
Chapter
On the 50th anniversary of the 1966 flood, the University of Florence, together with many other institutions, promoted the “Florence 2016 Project” by collecting materials, launching new research activities, supporting projects and events to obtain tangible results for the prevention of future disasters and identify good practices for the protection...
Article
Full-text available
The study presents results from applying the Real Aperture Radar interferometry technique and Digital Image Correlation through a mobile phone camera to identify static and dynamic deformations of a gantry during surveying operations on the Michelangelo’s David at the Galleria dell’Accademia di Firenze Museum in Florence. The statue has considerabl...
Article
Full-text available
The work presents a survey campaign specifically designed to formulate an effective restoration project in a Cultural Heritage context, the Military Shrine in Cima Grappa (Italy). Several outputs have been generated by exploring the most advanced laser scanning survey technique and some specific point cloud analysis algorithms. A detailed geometric...
Article
Full-text available
The paper points the attention to some hidden parts of metric surveys, that usually are not enough documented in scientific papers but in technical reposts. Reporting encountered challenges and discussing identified technical solutions and methodologies to overcome bottlenecks and operative issues, highlights the novelty of the presented experience...
Article
Full-text available
The paper presents results from applying Digital Image Correlation (DIC) technique to determine deformations and verify stability on a gantry during surveying operations on the Michelangelo’s David at the Galleria dell’Accademia di Firenze museum in Florence. An advanced hi-resolution Structured-light 3D scanner has been used to create a hi-detaile...
Article
Full-text available
This paper presents results from applying semi-automatic point cloud segmentation methods in the underground tunnels within the Military Shrine’s conservative restoration project in Cima Grappa (Italy). The studied area, which has a predominant underground development distributed in a network of tunnels, is characterized by diffuse rock collapsing....
Conference Paper
The work presents results obtained performing a survey campaign specifically designed to formulate an effective restoration project in a critical context. Within the remarkable project, promoted and financed by the Italian Presidency of the Council of the Ministers, and the Italian Ministry of Defence, for designing the conservative restoration pla...
Article
Full-text available
This paper presents the geomatic contribution to the hydrographical survey applied to the Arno River in Tuscany (Italy) that has been performed to obtain both underwater cross-sections as well as riverbank height using point cloud data from echo-sounder and terrestrial laser scanner so that water flow storage capability could be further estimated w...
Article
Full-text available
The advent of the smartphones brought with them higher processing capabilities and improved camera specifications which boosted the applications of mobile-based imagery in a range of domains. One of them is the 3-D reconstruction of objects by means of photogrammetry, which now enjoys great popularity. This fact brings potential opportunities to de...
Article
Full-text available
This paper focuses on the implementation of new techniques for bathymetric inspections. The scope is the exploitation of sensors, usually and commonly used for navigation, namely the altimeter and the Forward Looking Sonar (FLS), for identifying objects which are laying on the sea floor. In this particular framework, the low spatial resolution and...
Article
Full-text available
Autonomous Underwater Vehicles (AUVs), benefiting from significant investments in the past years, are commonly used for military security and offshore Oil&Gas applications. The ARROWS project, aimed at exporting the AUV technology to the field of underwater archaeology, a low-budget research field compared to the previous ones. The paper focuses on...
Article
Full-text available
The paper presents preliminary findings from a research study designed to assess the health status of a medieval bridge built on 1500 under the Medici dynasty over the river Sieve, close to Florence. The structure, a two span stone bridge with a main central pillar, experienced some restructuring interventions from 1555 to the present. The left spa...
Article
Full-text available
An innovative wireless sensor network (WSN) based on Ultra-Wide Band (UWB) technology for 3D accurate superficial monitoring of ground deformations, as landslides and subsidence, is proposed. The system has been designed and developed as part of an European Life+ project, called Wi-GIM (Wireless Sensor Network for Ground Instability Monitoring). Th...
Preprint
Full-text available
An innovative wireless sensor network (WSN) based on Ultra-Wide Band (UWB) technology for 3D accurate superficial monitoring of ground deformations, as landslides and subsidence, is proposed. The system has been designed and developed as part of an European Life+ project, called Wi-GIM (Wireless Sensor Network for Ground Instability Monitoring). Th...
Article
Full-text available
Ground displacement monitoring is one of the most important aspects of early warning systems and risk management strategies when addressing phenomena such as landslides or subsidence. Several types of instrumentation already exist, but those able to provide real-time warnings on multiple time series are typically based on expensive technology, high...
Article
Full-text available
Background Rockfall events are one of the most dangerous phenomena that often cause several damages both to people and facilities. During recent years, the scientific community focused the attention at evaluating the effectiveness of seismological methods in monitoring these phenomena. In this work, we present a quick and practical method to locate...
Conference Paper
This paper describes some experiences gained by the University of Florence (UNIFI) on the development of two low-cost Unmanned Underwater Vehicles (UUV). The first one, named NEMO, is a Remotely Operated Vehicle (ROV) specifically designed for the exploration of the Costa Concordia wreck, Isola del Giglio, Italy. The second one, named FeelHippo, is...
Article
Remotely operated underwater vehicles are mobile robots increasingly used in underwater applications; these devices are widely used and suitable for different scenarios, for example, for patrolling and monitoring and also for underwater interventions. In the last 30 years, the remotely operated underwater vehicles have become more and more advanced...
Article
Full-text available
Sinkholes represent a natural risk that may hit catastrophically without clearly detectible precursors. However, they are often overlooked by people and administrators. Therefore sinkhole monitoring and associated early warnings constitute a important research topics but currently only a few papers about sinkhole prediction can be found. In this pa...
Article
Full-text available
At Il Piano (Elba Island, Central Italy) 11 sinkhole events occurred on 9 different points on or close to a strategic road connecting Rio Marina to the rest of the island. In order to reduce the risk, a ground-based interferometric radar has been experimentally installed to detect possible precursor deformations of the ground. In this paper we pres...
Article
Full-text available
Stromboli volcano (Southern Italy) is one of the most monitored volcano in the world with a surveillance network that includes a permanently sited ground-based SAR interferometer (GBInSAR). This work is the review of the GBInSAR data gained from the last decade of monitoring activity. The analysis of the entire dataset of GBInSAR measurements allow...
Article
Full-text available
An integrated methodology based on traditional field and remote surveys such as terrestrial laser scanning and terrestrial infrared thermography is proposed, with the aim of defining susceptibility scenarios connected to rock slopes affected by instability processes. The proposed methodology was applied to a rock slope threatening a coastal panoram...
Article
Full-text available
Stromboli is characterized by frequent explosions of variable energy and periodically interrupted by more en-ergetic blasts emitting large volumes of material. The pressurization of a volatile-poor, high-porphyritic magma column that is gas-recharged by the deep-seated, volatile-rich, low-porphyritic magma precedes such events and produces deformat...
Conference Paper
The recent development of new remote sensing instrumentations, such as ground-based radar and terrestrial laser scanner, has encouraged the implementation of these non-invasive devices during diagnostic campaigns for the monitoring and geotechnical characterization of the instability processes in historic sites. This work presents the results of th...
Article
Full-text available
At Stromboli volcano (Southern Italy), only few minor precursors (gas output) have been identified for 'major' Strombolian explosions. We use ground-based interferometric synthetic aperture radar (GBInSAR) technology to monitor the displacement rate of the summit area of Stromboli. We analysed the 2009-2011 period. We analysed three major explosion...
Article
Full-text available
Stromboli is a volcanic island in Southern Italy characterized by explosions of variable energy every 10-20 minutes and periodically interrupted by more energetic blasts emitting large volumes of material. The pressurization of volatile-poor, high-porphyritic magma column that is gas-recharged by the deep-seated, volatile-rich, low-porphyritic magm...
Data
At Stromboli volcano (Southern Italy), only few minor precursors (gas output) have been identified for ‘major’ Strombolian explosions. We use ground-based interferometric synthetic aperture radar (GBInSAR) technology to monitor the displacement rate of the summit area of Stromboli. We analysed the 2009–2011 period. The analysis of the displacement...
Data
At Stromboli volcano (Southern Italy), only few minor precursors (gas output) have been identified for ‘major’ Strombolian explosions. We use ground-based interferometric synthetic aperture radar (GBInSAR) technology to monitor the displacement rate of the summit area of Stromboli. We analysed the 2009–2011 period. The analysis of the displacement...
Article
Full-text available
In this paper all the phases for the realization of the early warning system for the rockslide of Torgiovannetto in Central Italy are described. The landslide consists in a 182,000 m3 rock wedge threatening two roads which are important for local transportation. The present work encompasses all the components of an early warning system, including t...
Conference Paper
Full-text available
Conservation of outdoor stone heritage built on unstable rock masses can benefit from a holistic approach which leads to an analysis of instability mechanisms of the geologic substratum, deterioration processes of the architectural surfaces and their mutual relationships over time. An analytical procedure combining on site and laboratory diagnostic...
Conference Paper
Full-text available
A holistic methodology combining conventional diagnostic investigations and kinematic analysis performed on 3D laser scanning survey is here proposed for rockfall hazard assessment and erosion patterns study, to map critical sectors and evaluate potential impacts on the conservation of cultural heritage sites built on unstable rock masses. Experime...
Article
Full-text available
The superimposition of geological formations with marked contrast in geotechnical properties presents one of the most critical environments for slope instability due to the different response of the materials to the applied disturbances. Moreover, the above-mentioned geological setting is often associated with high risk conditions, since many isola...
Conference Paper
Full-text available
Within the framework of landslide management, early warning systems (EWSs) are an alternative and cost-effective means to reduce the risk with a low environmental and economical impact. In some cases they can even be the only solution, for instance when a landslide is so large that it cannot possibly be stabilized, when in an area there are too man...
Conference Paper
Full-text available
Military architecture heritage is frequently built on rock masses affected by slope instability and weathering processes, which progressively undermine the foundations and cause collapses and toppling of the masonries. The latter can be also weakened by alteration of the stone surfaces, as a consequence of the interactions with the local environmen...
Article
Full-text available
At Stromboli volcano (Southern Italy), only few minor precursors (gas output) have been identified for ‘major’ Strombolian explosions. We use ground-based interferometric synthetic aperture radar (GBInSAR) technology to monitor the displacement rate of the summit area of Stromboli. We analysed the 2009–2011 period. The analysis of the displacement...
Conference Paper
Full-text available
Volcanic eruptions are preceded by a series of detectable phenomena related to: i) rise of magma and gas from deep, dike-filling intrusions, ii) increase in magma pressures within conduits, iii) inflation of volcanic edifices.. Ground deformation resulting from volcano inflation can be recorded by various techniques as the recent ground-based radar...
Conference Paper
Full-text available
On March 10th, 2010, due to the heavy rainfall occurred in the previous days, the Montaguto earthflow reactivated, involving the road SS 90 “Delle Puglie”, as already happened in September 2009 and previously in May 2005, and reaching the Caserta-Foggia railway. The Department of Earth Sciences, University of Florence (DST-UNIFI), on behalf of the...
Article
Full-text available
The terrestrial laser scanning (TLS) technique has been used to accurately reconstruct the 3-D shape of the walls and bastions of the historic city of Mdina (Malta) and underlying terrain. By applying this technique it has also been possible to extract additional quantitative information regarding weathering and deformational processes affecting th...
Article
A Ground Based SAR Interferometer (GB-InSAR) was installed at Stromboli volcano (Italy) in February 2003 to continuously monitor the behaviour of the morphological depression known as Sciara del Fuoco, SdF, with alerting purposes. This was decided as a consequence of the collapse of a large landslide from the NW slope of the SdF and the subsequent...

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Projects

Project (1)
Archived project
Wireless sensor network for Ground Instability Monitoring (Wi-GIM) project aims, in the frame of EU LIFE+ program, to develop an accurate, flexible and low-cost system for ground deformation monitoring. The Wi-GIM system is based on two types of wireless devices: the nodes (sensor node - SN) and base stations (Base Station - BS). The movement of ground is detected by acquiring the position of each of the SN that are organized in a wireless sensor network (WSN), whose position is determined by integrating two different technologies, specifically designed for the purpose. The data collected by technology 1 are processed with the data collected by technology 2 in order increase the accuracy of the system. The displacements of the landslide can be then displayed in different modes, including 3D.