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Prof. Riccardo Roncella
Universita degli Studi di Parma, Department of Engineering and Architecture, Parma, Italy

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0 Monitoring
0 image matching
0 3D Reconstruction
0 Image orientation

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image matching
3D Reconstruction
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Journal article
Published: 26 March 2021 in Remote Sensing
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Digital surface models (DSM) have become one of the main sources of geometrical information for a broad range of applications. Image-based systems typically rely on passive sensors which can represent a strong limitation in several survey activities (e.g., night-time monitoring, underground survey and night surveillance). However, recent progresses in sensor technology allow very high sensitivity which drastically improves low-light image quality by applying innovative noise reduction techniques. This work focuses on the performances of night-time photogrammetric systems devoted to the monitoring of rock slopes. The study investigates the application of different camera settings and their reliability to produce accurate DSM. A total of 672 stereo-pairs acquired with high-sensitivity cameras (Nikon D800 and D810) at three different testing sites were considered. The dataset includes different camera configurations (ISO speed, shutter speed, aperture and image under-/over-exposure). The use of image quality assessment (IQA) methods to evaluate the quality of the images prior to the 3D reconstruction is investigated. The results show that modern high-sensitivity cameras allow the reconstruction of accurate DSM in an extreme low-light environment and, exploiting the correct camera setup, achieving comparable results to daylight acquisitions. This makes imaging sensors extremely versatile for monitoring applications at generally low costs.

ACS Style

Riccardo Roncella; Nazarena Bruno; Fabrizio Diotri; Klaus Thoeni; Anna Giacomini. Photogrammetric Digital Surface Model Reconstruction in Extreme Low-Light Environments. Remote Sensing 2021, 13, 1261 .

AMA Style

Riccardo Roncella, Nazarena Bruno, Fabrizio Diotri, Klaus Thoeni, Anna Giacomini. Photogrammetric Digital Surface Model Reconstruction in Extreme Low-Light Environments. Remote Sensing. 2021; 13 (7):1261.

Chicago/Turabian Style

Riccardo Roncella; Nazarena Bruno; Fabrizio Diotri; Klaus Thoeni; Anna Giacomini. 2021. "Photogrammetric Digital Surface Model Reconstruction in Extreme Low-Light Environments." Remote Sensing 13, no. 7: 1261.

Journal article
Published: 31 July 2020 in Remote Sensing
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In surface mining, rockfall can seriously threaten the safety of personnel located at the base of highwalls and cause serious damage to equipment and machinery. Close-range photogrammetry for the continuous monitoring of rock surfaces represents a valid tool to efficiently assess the potential rockfall hazard and estimate the risk in the affected areas. This work presents an autonomous terrestrial stereo-pair photogrammetric monitoring system developed to observe volumes falling from sub-vertical rock faces located in surface mining environments. The system has the versatility for rapid installation and quick relocation in areas often constrained by accessibility and safety issues and it has the robustness to tolerate the rough environmental conditions typical of mining operations. It allows the collection of synchronised images at different periods with high-sensitivity digital single-lens reflex cameras, producing accurate digital surface models (DSM) of the rock face. Comparisons between successive DSMs can detect detachments and surface movements during defined observation periods. Detailed analysis of the changes in the rock surface, volumes and frequency of the rocks dislodging from the sub-vertical rock surfaces can provide accurate information on event magnitude and return period at very reasonable cost and, therefore, can generate the necessary data for a detailed inventory of the rockfall spatial-temporal occurrence and magnitude. The system was first validated in a trial site, and then applied on a mine site located in NSW (Australia). Results were analysed in terms of multi-temporal data acquired over a period of seven weeks. The excellent detail of the data allowed trends in rockfall event to be correlated to lithology and rainfall events, demonstrating the capability of the system to generate useful data that would otherwise require extended periods of direct observation.

ACS Style

Anna Giacomini; Klaus Thoeni; Marina Santise; Fabrizio Diotri; Shaun Booth; Stephen Fityus; Riccardo Roncella. Temporal-Spatial Frequency Rockfall Data from Open-Pit Highwalls Using a Low-Cost Monitoring System. Remote Sensing 2020, 12, 2459 .

AMA Style

Anna Giacomini, Klaus Thoeni, Marina Santise, Fabrizio Diotri, Shaun Booth, Stephen Fityus, Riccardo Roncella. Temporal-Spatial Frequency Rockfall Data from Open-Pit Highwalls Using a Low-Cost Monitoring System. Remote Sensing. 2020; 12 (15):2459.

Chicago/Turabian Style

Anna Giacomini; Klaus Thoeni; Marina Santise; Fabrizio Diotri; Shaun Booth; Stephen Fityus; Riccardo Roncella. 2020. "Temporal-Spatial Frequency Rockfall Data from Open-Pit Highwalls Using a Low-Cost Monitoring System." Remote Sensing 12, no. 15: 2459.

Journal article
Published: 26 July 2019 in Remote Sensing
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The so-called Real Time Kinematic (RTK) option, which allows one to determine with cm-level accuracy the Unmanned Aerial Vehicles (UAV) camera position at shooting time, is also being made available on medium- or low-cost drones. It can be foreseen that a sizeable amount of UAV surveys will be soon performed (almost) without Ground Control Points (GCP). However, obstacles to Global Navigation Satellite Systems (GNSS) signal at the optimal flight altitude might prevent accurate retrieval of camera station positions, e.g., in narrow gorges. In such cases, the master block can be georeferenced by tying it to an (auxiliary) block flown at higher altitude, where the GNSS signal is not impeded. To prove the point in a worst case scenario, but under controlled conditions, an experiment was devised. A single strip about 700 m long, surveyed by a multi-copter at 30 m relative flight height, was referenced with cm-level accuracy by joint adjustment with a block flown at 100 m relative flight height, acquired by a fixed-wing UAV provided with RTK option. The joint block orientation was repeated with or without GCP and with pre-calibrated or self-calibrated camera parameters. Accuracy on ground was assessed on a fair number of Check Points (CP). The results show that, even without GCP, the precision is effectively transferred from the auxiliary block projection centres to the object point horizontal coordinates and, with a pre-calibrated camera, also to the elevations.

ACS Style

Gianfranco Forlani; Fabrizio Diotri; Umberto Morra Di Cella; Riccardo Roncella. Indirect UAV Strip Georeferencing by On-Board GNSS Data under Poor Satellite Coverage. Remote Sensing 2019, 11, 1765 .

AMA Style

Gianfranco Forlani, Fabrizio Diotri, Umberto Morra Di Cella, Riccardo Roncella. Indirect UAV Strip Georeferencing by On-Board GNSS Data under Poor Satellite Coverage. Remote Sensing. 2019; 11 (15):1765.

Chicago/Turabian Style

Gianfranco Forlani; Fabrizio Diotri; Umberto Morra Di Cella; Riccardo Roncella. 2019. "Indirect UAV Strip Georeferencing by On-Board GNSS Data under Poor Satellite Coverage." Remote Sensing 11, no. 15: 1765.

Journal article
Published: 25 July 2019 in Remote Sensing
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Thanks to its capability of archiving and organizing all the information about a building, HBIM (Historical Building Information Modeling) is considered a promising resource for planned conservation of historical assets. However, its usage remains limited and scarcely adopted by the subjects in charge of conservation, mainly because of its rather complex 3D modeling requirements and a lack of shared regulatory references and guidelines as far as semantic data are concerned. In this study, we developed an HBIM methodology to support documentation, management, and planned conservation of historic buildings, with particular focus on non-geometric information: organized and coordinated storage and management of historical data, easy analysis and query, time management, flexibility, user-friendliness, and information sharing. The system is based on a standalone specific-designed database linked to the 3D model of the asset, built with BIM software, and it is highly adaptable to different assets. The database is accessible both with a developed desktop application, which acts as a plug-in for the BIM software, and through a web interface, implemented to ensure data sharing and easy usability by skilled and unskilled users. The paper describes in detail the implemented system, passing by semantic breaking down of the building, database design, as well as system architecture and capabilities. Two case studies, the Cathedral of Parma and Ducal Palace of Mantua (Italy), are then presented to show the results of the system’s application.

ACS Style

Nazarena Bruno; Riccardo Roncella. HBIM for Conservation: A New Proposal for Information Modeling. Remote Sensing 2019, 11, 1751 .

AMA Style

Nazarena Bruno, Riccardo Roncella. HBIM for Conservation: A New Proposal for Information Modeling. Remote Sensing. 2019; 11 (15):1751.

Chicago/Turabian Style

Nazarena Bruno; Riccardo Roncella. 2019. "HBIM for Conservation: A New Proposal for Information Modeling." Remote Sensing 11, no. 15: 1751.

Journal article
Published: 28 April 2019 in Construction and Building Materials
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Curved glazed façades of buildings are often realized by cold bending of flat plates. This paper is devoted to experimental tests under static loading on the geometrically non-linear anticlastic bending of aluminium plates, whose constituent material is used as a phantom material to mimic the elastic mechanical behaviour of glass. The 3D displacement field of the plates is reconstructed through the use of the DIC (Digital Image Correlation) technique and several numerical FE analyses are performed to simulate the experimental results. A critical value, corresponding to a configuration of the plate where a change in its curvature sign occurs, of the applied displacement at the plate corner is determined. The results are discussed in terms of critical applied displacement against the plate thickness for different plate sizes. It is shown that the critical displacements are almost independent on the plate size, but linearly depend on the plate thickness.

ACS Style

Andrea Spagnoli; Roberto Brighenti; Marco Biancospino; Marco Rossi; Riccardo Roncella. Geometrically non-linear bending of plates: Implications in curved building façades. Construction and Building Materials 2019, 214, 698 -708.

AMA Style

Andrea Spagnoli, Roberto Brighenti, Marco Biancospino, Marco Rossi, Riccardo Roncella. Geometrically non-linear bending of plates: Implications in curved building façades. Construction and Building Materials. 2019; 214 ():698-708.

Chicago/Turabian Style

Andrea Spagnoli; Roberto Brighenti; Marco Biancospino; Marco Rossi; Riccardo Roncella. 2019. "Geometrically non-linear bending of plates: Implications in curved building façades." Construction and Building Materials 214, no. : 698-708.

Journal article
Published: 31 January 2019 in ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Google Street View is a technology implemented in several Google services/applications (e.g. Google Maps, Google Earth) which provides the user, interested in viewing a particular location on the map, with panoramic images (represented in equi-rectangular projection) at street level. Generally, consecutive panoramas are acquired with an average distance of 5–10 m and can be compared to a traditional photogrammetric strip and, thus, processed to reconstruct portion of city at nearly zero cost. Most of the photogrammetric software packages available today implement spherical camera models and can directly process images in equi-rectangular projection. Although many authors provided in the past relevant works that involved the use of Google Street View imagery, mainly for 3D city model reconstruction, very few references can be found about the actual accuracy that can be obtained with such data. The goal of the present work is to present preliminary tests (at time of writing just three case studies has been analysed) about the accuracy and reliability of the 3D models obtained from Google Street View panoramas.

ACS Style

N. Bruno; R. Roncella. ACCURACY ASSESSMENT OF 3D MODELS GENERATED FROM GOOGLE STREET VIEW IMAGERY. ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences 2019, XLII-2/W9, 181 -188.

AMA Style

N. Bruno, R. Roncella. ACCURACY ASSESSMENT OF 3D MODELS GENERATED FROM GOOGLE STREET VIEW IMAGERY. ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. 2019; XLII-2/W9 ():181-188.

Chicago/Turabian Style

N. Bruno; R. Roncella. 2019. "ACCURACY ASSESSMENT OF 3D MODELS GENERATED FROM GOOGLE STREET VIEW IMAGERY." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2/W9, no. : 181-188.

Journal article
Published: 30 May 2018 in The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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The need to safeguard and preserve Cultural Heritage (CH) is increasing and especially in Italy, where the amount of historical buildings is considerable, having efficient and standardized processes of CH management and conservation becomes strategic. At the time being, there are no tools capable of fulfilling all the specific functions required by Cultural Heritage documentation and, due to the complexity of historical assets, there are no solution as flexible and customizable as CH specific needs require. Nevertheless, BIM methodology can represent the most effective solution, on condition that proper methodologies, tools and functions are made available. The paper describes an ongoing research on the implementation of a Historical BIM system for the Parma cathedral, aimed at the maintenance, conservation and restoration. Its main goal was to give a concrete answer to the lack of specific tools required by Cultural Heritage documentation: organized and coordinated storage and management of historical data, easy analysis and query, time management, 3D modelling of irregular shapes, flexibility, user-friendliness, etc. The paper will describe the project and the implemented methodology, focusing mainly on survey and modelling phases. In describing the methodology, critical issues about the creation of a HBIM will be highlighted, trying to outline a workflow applicable also in other similar contexts.

ACS Style

N. Bruno; R. Roncella. A RESTORATION ORIENTED HBIM SYSTEM FOR CULTURAL HERITAGE DOCUMENTATION: THE CASE STUDY OF PARMA CATHEDRAL. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences 2018, XLII-2, 171 -178.

AMA Style

N. Bruno, R. Roncella. A RESTORATION ORIENTED HBIM SYSTEM FOR CULTURAL HERITAGE DOCUMENTATION: THE CASE STUDY OF PARMA CATHEDRAL. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. 2018; XLII-2 ():171-178.

Chicago/Turabian Style

N. Bruno; R. Roncella. 2018. "A RESTORATION ORIENTED HBIM SYSTEM FOR CULTURAL HERITAGE DOCUMENTATION: THE CASE STUDY OF PARMA CATHEDRAL." The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2, no. : 171-178.

Journal article
Published: 30 May 2018 in The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Rockfalls and rockslides represent a significant risk to human lives and infrastructures because of the high levels of energy involved in the phenomena. Generally, these events occur in accordance to specific environmental conditions, such as temperature variations between day and night, that can contribute to the triggering of structural instabilities in the rock-wall and the detachment of blocks and debris. The monitoring and the geostructural characterization of the wall are required for reducing the potential hazard and to improve the management of the risk at the bottom of the slopes affected by such phenomena. In this context, close range photogrammetry is largely used for the monitoring of high-mountain terrains and rock walls in mine sites allowing for periodic survey of rockfalls and wall movements. This work focuses on the analysis of low-light and night-time images of a fixed-base stereo pair photogrammetry system. The aim is to study the reliability of the images acquired over the night to produce digital surface models (DSMs) for change detection. The images are captured by a high-sensitivity DLSR camera using various settings accounting for different values of ISO, aperture and time of exposure. For each acquisition, the DSM is compared to a photogrammetric reference model produced by images captured in optimal illumination conditions. Results show that, with high level of ISO and maintaining the same grade of aperture, extending the exposure time improves the quality of the point clouds in terms of completeness and accuracy of the photogrammetric models.

ACS Style

M. Santise; K. Thoeni; R. Roncella; F. Diotri; A. Giacomini. ANALYSIS OF LOW-LIGHT AND NIGHT-TIME STEREO-PAIR IMAGES FOR PHOTOGRAMMETRIC RECONSTRUCTION. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences 2018, XLII-2, 1015 -1022.

AMA Style

M. Santise, K. Thoeni, R. Roncella, F. Diotri, A. Giacomini. ANALYSIS OF LOW-LIGHT AND NIGHT-TIME STEREO-PAIR IMAGES FOR PHOTOGRAMMETRIC RECONSTRUCTION. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. 2018; XLII-2 ():1015-1022.

Chicago/Turabian Style

M. Santise; K. Thoeni; R. Roncella; F. Diotri; A. Giacomini. 2018. "ANALYSIS OF LOW-LIGHT AND NIGHT-TIME STEREO-PAIR IMAGES FOR PHOTOGRAMMETRIC RECONSTRUCTION." The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2, no. : 1015-1022.

Journal article
Published: 23 May 2018 in Road Materials and Pavement Design
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ACS Style

Antonio Roberto; Elena Romeo; Antonio Montepara; Riccardo Roncella. Effect of fillers and their fractional voids on fundamental fracture properties of asphalt mixtures and mastics. Road Materials and Pavement Design 2018, 21, 25 -41.

AMA Style

Antonio Roberto, Elena Romeo, Antonio Montepara, Riccardo Roncella. Effect of fillers and their fractional voids on fundamental fracture properties of asphalt mixtures and mastics. Road Materials and Pavement Design. 2018; 21 (1):25-41.

Chicago/Turabian Style

Antonio Roberto; Elena Romeo; Antonio Montepara; Riccardo Roncella. 2018. "Effect of fillers and their fractional voids on fundamental fracture properties of asphalt mixtures and mastics." Road Materials and Pavement Design 21, no. 1: 25-41.

Journal article
Published: 17 February 2018 in Remote Sensing
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High-resolution Digital Surface Models (DSMs) from unmanned aerial vehicles (UAVs) imagery with accuracy better than 10 cm open new possibilities in geosciences and engineering. The accuracy of such DSMs depends on the number and distribution of ground control points (GCPs). Placing and measuring GCPs are often the most time-consuming on-site tasks in a UAV project. Safety or accessibility concerns may impede their proper placement, so either costlier techniques must be used, or a less accurate DSM is obtained. Photogrammetric blocks flown by drones with on-board receivers capable of RTK (real-time kinematic) positioning do not need GCPs, as camera stations at exposure time can be determined with cm-level accuracy, and used to georeference the block and control its deformations. This paper presents an experimental investigation on the repeatability of DSM generation from several blocks acquired with a RTK-enabled drone, where differential corrections were sent from a local master station or a network of Continuously Operating Reference Stations (CORS). Four different flights for each RTK mode were executed over a test field, according to the same flight plan. DSM generation was performed with three block control configurations: GCP only, camera stations only, and with camera stations and one GCP. The results show that irrespective of the RTK mode, the first and third configurations provide the best DSM inner consistency. The average range of the elevation discrepancies among the DSMs in such cases is about 6 cm (2.5 GSD, ground sampling density) for a 10-cm resolution DSM. Using camera stations only, the average range is almost twice as large (4.7 GSD). The average DSM accuracy, which was verified on checkpoints, turned out to be about 2.1 GSD with the first and third configurations, and 3.7 GSD with camera stations only.

ACS Style

Gianfranco Forlani; Elisa Dall’Asta; Fabrizio Diotri; Umberto Morra Di Cella; Riccardo Roncella; Marina Santise. Quality Assessment of DSMs Produced from UAV Flights Georeferenced with On-Board RTK Positioning. Remote Sensing 2018, 10, 311 .

AMA Style

Gianfranco Forlani, Elisa Dall’Asta, Fabrizio Diotri, Umberto Morra Di Cella, Riccardo Roncella, Marina Santise. Quality Assessment of DSMs Produced from UAV Flights Georeferenced with On-Board RTK Positioning. Remote Sensing. 2018; 10 (2):311.

Chicago/Turabian Style

Gianfranco Forlani; Elisa Dall’Asta; Fabrizio Diotri; Umberto Morra Di Cella; Riccardo Roncella; Marina Santise. 2018. "Quality Assessment of DSMs Produced from UAV Flights Georeferenced with On-Board RTK Positioning." Remote Sensing 10, no. 2: 311.

Journal article
Published: 14 November 2017 in The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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This paper presents preliminary tests of a new low-cost photogrammetric system for 4D modelling of large scale areas for civil engineering applications. The system consists of five stand-alone units. Each of the units is composed of a Raspberry Pi 2 Model B (RPi2B) single board computer connected to a PiCamera Module V2 (8 MP) and is powered by a 10 W solar panel. The acquisition of the images is performed automatically using Python scripts and the OpenCV library. Images are recorded at different times during the day and automatically uploaded onto a FTP server from where they can be accessed for processing. Preliminary tests and outcomes of the system are discussed in detail. The focus is on the performance assessment of the low-cost sensor and the quality evaluation of the digital surface models generated by the low-cost photogrammetric systems in the field under real test conditions. Two different test cases were set up in order to calibrate the low-cost photogrammetric system and to assess its performance. First comparisons with a TLS model show a good agreement.

ACS Style

M. Santise; K. Thoeni; R. Roncella; S. W. Sloan; A. Giacomini. PRELIMINARY TESTS OF A NEW LOW-COST PHOTOGRAMMETRIC SYSTEM. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences 2017, XLII-2/W8, 229 -236.

AMA Style

M. Santise, K. Thoeni, R. Roncella, S. W. Sloan, A. Giacomini. PRELIMINARY TESTS OF A NEW LOW-COST PHOTOGRAMMETRIC SYSTEM. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. 2017; XLII-2/W8 ():229-236.

Chicago/Turabian Style

M. Santise; K. Thoeni; R. Roncella; S. W. Sloan; A. Giacomini. 2017. "PRELIMINARY TESTS OF A NEW LOW-COST PHOTOGRAMMETRIC SYSTEM." The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2/W8, no. : 229-236.

Journal article
Published: 01 May 2017 in ISPRS Journal of Photogrammetry and Remote Sensing
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Among other techniques, aerial and terrestrial photogrammetry have long been used to control the displacements of landslides and glaciers as well as for the detection of terrain morphological changes. Unmanned Aerial Systems (UAS) are today an efficient tool to perform data acquisition in rough or difficult terrain, both safely and quickly, avoiding hazards and risks for the operators while at the same time containing the survey costs. Since 2012 ARPAVdA (the Regional Environmental Protection Agency of Aosta Valley, Italy) periodically surveys with UAS photogrammetry the Gran Sometta rock glacier, the Agency main monitoring site for the climate change impacts on high-mountain areas and related infrastructures. A Digital Surface Model (DSM) and an orthophoto of the rock glacier are produced after each survey flight. In order to accurately georeference them in a stable reference system, a Global Navigation Satellite System (GNSS) campaign is carried out at each epoch, to update the coordinates of signalised Ground Control Points (GCPs), since they partly lay in unstable (moving) areas. In late August 2015 a survey flight has been executed with a senseFly eBee RTK, with differential corrections sent from a ground reference station. The block has been adjusted without GCP using, as control information, only the projection centres coordinates encoded in the images. The RMS of the differences found on twelve Check Points were about 4 cm in horizontal and 7 cm in elevation, i.e. practically the same accuracy found using GCP. Differences between the DSMs produced at the same epoch with block orientation performed with GCP and with GNSS-determined projection centres were also investigated. To evaluate the rock glacier displacement fields between two epochs, corresponding features were at first manually identified on the orthophotos by a trained operator. To avoid the manual time-consuming procedure and increase the density of displacement information, two automatic procedures, the former using Least Squares Matching (LSM) and the latter a proprietary implementation of Semi-Global Matching (SGM) have been implemented. Both techniques were applied to pairs of orthophotos as well as to pairs of DSMs at different epochs. A discussion of the characteristics of the implemented methods is provided and the results of the comparison of the two methods with manual measurements are illustrated. Overall, results using DSM matching provided higher completeness of the displacement field than orthophoto matching, especially if long-term (year-to-year) comparisons are considered. At the same time, SGM in both cases produced less mismatches and more smooth and reliable displacement fields than LSM.

ACS Style

Elisa Dall’Asta; Gianfranco Forlani; Riccardo Roncella; Marina Santise; Fabrizio Diotri; Umberto Morra di Cella. Unmanned Aerial Systems and DSM matching for rock glacier monitoring. ISPRS Journal of Photogrammetry and Remote Sensing 2017, 127, 102 -114.

AMA Style

Elisa Dall’Asta, Gianfranco Forlani, Riccardo Roncella, Marina Santise, Fabrizio Diotri, Umberto Morra di Cella. Unmanned Aerial Systems and DSM matching for rock glacier monitoring. ISPRS Journal of Photogrammetry and Remote Sensing. 2017; 127 ():102-114.

Chicago/Turabian Style

Elisa Dall’Asta; Gianfranco Forlani; Riccardo Roncella; Marina Santise; Fabrizio Diotri; Umberto Morra di Cella. 2017. "Unmanned Aerial Systems and DSM matching for rock glacier monitoring." ISPRS Journal of Photogrammetry and Remote Sensing 127, no. : 102-114.

Journal article
Published: 18 February 2017 in Remote Sensing
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UAV Photogrammetry today already enjoys a largely automated and efficient data processing pipeline. However, the goal of dispensing with Ground Control Points looks closer, as dual-frequency GNSS receivers are put on board. This paper reports on the accuracy in object space obtained by GNSS-supported orientation of four photogrammetric blocks, acquired by a senseFly eBee RTK and all flown according to the same flight plan at 80 m above ground over a test field. Differential corrections were sent to the eBee from a nearby ground station. Block orientation has been performed with three software packages: PhotoScan, Pix4D and MicMac. The influence on the checkpoint errors of the precision given to the projection centers has been studied: in most cases, values in Z are critical. Without GCP, the RTK solution consistently achieves a RMSE of about 2–3 cm on the horizontal coordinates of checkpoints. In elevation, the RMSE varies from flight to flight, from 2 to 10 cm. Using at least one GCP, with all packages and all test flights, the geocoding accuracy of GNSS-supported orientation is almost as good as that of a traditional GCP orientation in XY and only slightly worse in Z.

ACS Style

Francesco Benassi; Elisa Dall’Asta; Fabrizio Diotri; Gianfranco Forlani; Umberto Morra Di Cella; Riccardo Roncella; Marina Santise. Testing Accuracy and Repeatability of UAV Blocks Oriented with GNSS-Supported Aerial Triangulation. Remote Sensing 2017, 9, 172 .

AMA Style

Francesco Benassi, Elisa Dall’Asta, Fabrizio Diotri, Gianfranco Forlani, Umberto Morra Di Cella, Riccardo Roncella, Marina Santise. Testing Accuracy and Repeatability of UAV Blocks Oriented with GNSS-Supported Aerial Triangulation. Remote Sensing. 2017; 9 (2):172.

Chicago/Turabian Style

Francesco Benassi; Elisa Dall’Asta; Fabrizio Diotri; Gianfranco Forlani; Umberto Morra Di Cella; Riccardo Roncella; Marina Santise. 2017. "Testing Accuracy and Repeatability of UAV Blocks Oriented with GNSS-Supported Aerial Triangulation." Remote Sensing 9, no. 2: 172.

Journal article
Published: 01 February 2017 in Planetary and Space Science
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ACS Style

C. Re; E. Simioni; G. Cremonese; R. Roncella; G. Forlani; Y. Langevin; V. Da Deppo; G. Naletto; G. Salemi. Effects of image compression and illumination on digital terrain models for the stereo camera of the BepiColombo mission. Planetary and Space Science 2017, 136, 1 -14.

AMA Style

C. Re, E. Simioni, G. Cremonese, R. Roncella, G. Forlani, Y. Langevin, V. Da Deppo, G. Naletto, G. Salemi. Effects of image compression and illumination on digital terrain models for the stereo camera of the BepiColombo mission. Planetary and Space Science. 2017; 136 ():1-14.

Chicago/Turabian Style

C. Re; E. Simioni; G. Cremonese; R. Roncella; G. Forlani; Y. Langevin; V. Da Deppo; G. Naletto; G. Salemi. 2017. "Effects of image compression and illumination on digital terrain models for the stereo camera of the BepiColombo mission." Planetary and Space Science 136, no. : 1-14.

Journal article
Published: 01 February 2017 in Transportation Research Part F: Traffic Psychology and Behaviour
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Correctly designed roundabouts proved to have positive safety and functional performances. However, they are also affected by peculiar disadvantages. In particular, they are difficult to manoeuvre, especially for heavy vehicle drivers. Despite these concerns, there are currently no driving workload metrics devoted to roundabouts. A novel methodological approach is proposed for trying to quantify workload impinging on heavy vehicle drivers when manoeuvring through complex at-grade intersections. Proper acquisition of input data constitutes the starting point for future research about ascertainment of workload for these particular road scenarios. The described procedure enables recording steering wheel angles performed by a driver when manoeuvring an articulated lorry through a complex at-grade intersection. A field trial was carried out for verifying the practical feasibility of proposed method in capturing driver’s steering behaviour. Dynamic data acquired via global navigation satellite system instrumentation were related to actual driver’s steering wheel behaviour captured by camera frames. As a complement to the experiment, selected steering behaviour metrics were calculated. Steering Entropy attributed a high difficulty level to the manoeuvres performed through the roundabout, whereas High Frequency Component and Steering Reversal Rate showed intensity and occurrences of driver’s corrections needed for controlling position of the semitrailer at the ring. It appears that even a single roundabout may represent an arduous task for drivers. The study concludes with recommendations for further research about workload imposed by roundabouts to heavy vehicle drivers, with special attention to successions of closely spaced roundabouts.

ACS Style

Dario Pecchini; Riccardo Roncella; Gianfranco Forlani; Felice Giuliani. Measuring driving workload of heavy vehicles at roundabouts. Transportation Research Part F: Traffic Psychology and Behaviour 2017, 45, 27 -42.

AMA Style

Dario Pecchini, Riccardo Roncella, Gianfranco Forlani, Felice Giuliani. Measuring driving workload of heavy vehicles at roundabouts. Transportation Research Part F: Traffic Psychology and Behaviour. 2017; 45 ():27-42.

Chicago/Turabian Style

Dario Pecchini; Riccardo Roncella; Gianfranco Forlani; Felice Giuliani. 2017. "Measuring driving workload of heavy vehicles at roundabouts." Transportation Research Part F: Traffic Psychology and Behaviour 45, no. : 27-42.

Journal article
Published: 16 June 2016 in The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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The current work investigates the potential of two low-cost off-the-shelf quadcopters for multi-view reconstruction of sub-vertical rock faces. The two platforms used are a DJI Phantom 1 equipped with a Gopro Hero 3+ Black and a DJI Phantom 3 Professional with integrated camera. The study area is a small sub-vertical rock face. Several flights were performed with both cameras set in time-lapse mode. Hence, images were taken automatically but the flights were performed manually as the investigated rock face is very irregular which required manual adjustment of the yaw and roll for optimal coverage. The digital images were processed with commercial SfM software packages. Several processing settings were investigated in order to find out the one providing the most accurate 3D reconstruction of the rock face. To this aim, all 3D models produced with both platforms are compared to a point cloud obtained with a terrestrial laser scanner. Firstly, the difference between the use of coded ground control targets and the use of natural features was studied. Coded targets generally provide the best accuracy, but they need to be placed on the surface, which is not always possible, as sub-vertical rock faces are not easily accessible. Nevertheless, natural features can provide a good alternative if wisely chosen as shown in this work. Secondly, the influence of using fixed interior orientation parameters or self-calibration was investigated. The results show that, in the case of the used sensors and camera networks, self-calibration provides better results. To support such empirical finding, a numerical investigation using a Monte Carlo simulation was performed.

ACS Style

Klaus Thoeni; Davide Ettore Guccione; M. Santise; A. Giacomini; R. Roncella; G. Forlani. THE POTENTIAL OF LOW-COST RPAS FOR MULTI-VIEW RECONSTRUCTION OF SUB-VERTICAL ROCK FACES. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences 2016, XLI-B5, 909 -916.

AMA Style

Klaus Thoeni, Davide Ettore Guccione, M. Santise, A. Giacomini, R. Roncella, G. Forlani. THE POTENTIAL OF LOW-COST RPAS FOR MULTI-VIEW RECONSTRUCTION OF SUB-VERTICAL ROCK FACES. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. 2016; XLI-B5 ():909-916.

Chicago/Turabian Style

Klaus Thoeni; Davide Ettore Guccione; M. Santise; A. Giacomini; R. Roncella; G. Forlani. 2016. "THE POTENTIAL OF LOW-COST RPAS FOR MULTI-VIEW RECONSTRUCTION OF SUB-VERTICAL ROCK FACES." The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B5, no. : 909-916.

Journal article
Published: 15 June 2016 in The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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A preliminary survey campaign is essential in projects of restoration, urban renewal, rebuilding or promotion of architectural heritage. Today several survey techniques allow full 3D object restitution and modelling that provides a richer description than simple 2D representations. However, the amount of data to collect increases dramatically and a trade-off between efficiency and productivity from one side and assuring accuracy and completeness of the results on the other must be found. Depending on the extent and the complexity of the task, a single technique or a combination of several ones might be employed. Especially when documentation at different scales and with different levels of detail are foreseen, the latter will likely be necessary. The paper describes two architectural surveys in Italy: the old village of Navelli (AQ), affected by the earthquake in 2009, and the two most relevant remains in Codiponte (MS), damaged by the earthquake in 2013, both in the context of a project of restoration and conservation. In both sites, a 3D survey was necessary to represent effectively the objects. An integrated survey campaign was performed in both cases, which consists of a GPS network as support for georeferencing, an aerial survey and a field survey made by laser scanner and close range photogrammetry. The two case studies, thanks to their peculiarities, can be taken as exemplar to wonder if the integration of different surveying techniques is today still mandatory or, considering the technical advances of each technology, it is in fact just optional.

ACS Style

G. Bianchi; N. Bruno; E. Dall’Asta; G. Forlani; C. Re; R. Roncella; M. Santise; C. Vernizzi; A. Zerbi. INTEGRATED SURVEY FOR ARCHITECTURAL RESTORATION: A METHODOLOGICAL COMPARISON OF TWO CASE STUDIES. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences 2016, XLI-B5, 175 -182.

AMA Style

G. Bianchi, N. Bruno, E. Dall’Asta, G. Forlani, C. Re, R. Roncella, M. Santise, C. Vernizzi, A. Zerbi. INTEGRATED SURVEY FOR ARCHITECTURAL RESTORATION: A METHODOLOGICAL COMPARISON OF TWO CASE STUDIES. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. 2016; XLI-B5 ():175-182.

Chicago/Turabian Style

G. Bianchi; N. Bruno; E. Dall’Asta; G. Forlani; C. Re; R. Roncella; M. Santise; C. Vernizzi; A. Zerbi. 2016. "INTEGRATED SURVEY FOR ARCHITECTURAL RESTORATION: A METHODOLOGICAL COMPARISON OF TWO CASE STUDIES." The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B5, no. : 175-182.

Journal article
Published: 15 June 2016 in The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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In a context rich in history and cultural heritage, such as the Italian one, promotion and enhancement of historical evidences are crucial. The paper describes the case study of the Archaeological Museum of Parma, which, for the main part, conserves evidences found in the roman archaeological site of Veleia (Piacenza, Italy). To enhance the comprehension of the past, the project aims to promote the exhibits through new digital contents, in particular 3D models and AR applications, to improve their usability by the public. Projects like this pose some difficulties especially in data acquisition and restitution due to complexity of the objects and their dimension and position that are not always adequate for an easy survey. Furthermore, in this case, it was necessary to find a solution that takes into account, on one hand, the necessity of a high degree of detail to ensure high metric quality and, on the other hand, the need of producing small files, in order to easy load and consult them on the web or smartphone applications. For all these reasons, close-range photogrammetry was considered the most adequate technique to produce the major part of the models. In this paper, particular attention will be dedicated to the description of the survey campaign and data processing, underlining difficulties and adopted solutions, in order to provide a methodological summary of the actions performed.

ACS Style

E. Dall’Asta; N. Bruno; G. Bigliardi; A. Zerbi; R. Roncella. PHOTOGRAMMETRIC TECHNIQUES FOR PROMOTION OF ARCHAEOLOGICAL HERITAGE: THE ARCHAEOLOGICAL MUSEUM OF PARMA (ITALY). The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences 2016, XLI-B5, 243 -250.

AMA Style

E. Dall’Asta, N. Bruno, G. Bigliardi, A. Zerbi, R. Roncella. PHOTOGRAMMETRIC TECHNIQUES FOR PROMOTION OF ARCHAEOLOGICAL HERITAGE: THE ARCHAEOLOGICAL MUSEUM OF PARMA (ITALY). The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. 2016; XLI-B5 ():243-250.

Chicago/Turabian Style

E. Dall’Asta; N. Bruno; G. Bigliardi; A. Zerbi; R. Roncella. 2016. "PHOTOGRAMMETRIC TECHNIQUES FOR PROMOTION OF ARCHAEOLOGICAL HERITAGE: THE ARCHAEOLOGICAL MUSEUM OF PARMA (ITALY)." The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B5, no. : 243-250.

Journal article
Published: 15 June 2016 in The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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A preliminary survey campaign is essential in projects of restoration, urban renewal, rebuilding or promotion of architectural heritage. Today several survey techniques allow full 3D object restitution and modelling that provides a richer description than simple 2D representations. However, the amount of data to collect increases dramatically and a trade-off between efficiency and productivity from one side and assuring accuracy and completeness of the results on the other must be found. Depending on the extent and the complexity of the task, a single technique or a combination of several ones might be employed. Especially when documentation at different scales and with different levels of detail are foreseen, the latter will likely be necessary. The paper describes two architectural surveys in Italy: the old village of Navelli (AQ), affected by the earthquake in 2009, and the two most relevant remains in Codiponte (MS), damaged by the earthquake in 2013, both in the context of a project of restoration and conservation. In both sites, a 3D survey was necessary to represent effectively the objects. An integrated survey campaign was performed in both cases, which consists of a GPS network as support for georeferencing, an aerial survey and a field survey made by laser scanner and close range photogrammetry. The two case studies, thanks to their peculiarities, can be taken as exemplar to wonder if the integration of different surveying techniques is today still mandatory or, considering the technical advances of each technology, it is in fact just optional.

ACS Style

G. Bianchi; N. Bruno; E. Dall’Asta; G. Forlani; Cristina Re; R. Roncella; M. Santise; C. Vernizzi; A. Zerbi. INTEGRATED SURVEY FOR ARCHITECTURAL RESTORATION: A METHODOLOGICAL COMPARISON OF TWO CASE STUDIES. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences 2016, XLI-B5, 175 -182.

AMA Style

G. Bianchi, N. Bruno, E. Dall’Asta, G. Forlani, Cristina Re, R. Roncella, M. Santise, C. Vernizzi, A. Zerbi. INTEGRATED SURVEY FOR ARCHITECTURAL RESTORATION: A METHODOLOGICAL COMPARISON OF TWO CASE STUDIES. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. 2016; XLI-B5 ():175-182.

Chicago/Turabian Style

G. Bianchi; N. Bruno; E. Dall’Asta; G. Forlani; Cristina Re; R. Roncella; M. Santise; C. Vernizzi; A. Zerbi. 2016. "INTEGRATED SURVEY FOR ARCHITECTURAL RESTORATION: A METHODOLOGICAL COMPARISON OF TWO CASE STUDIES." The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B5, no. : 175-182.

Journal article
Published: 14 June 2016 in The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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The great amount of data that will be produced during the imaging of Mercury by the stereo camera (STC) of the BepiColombo mission needs a compromise with the restrictions imposed by the band downlink that could drastically reduce the duration and frequency of the observations. The implementation of an on-board real time data compression strategy preserving as much information as possible is therefore mandatory. The degradation that image compression might cause to the DTM accuracy is worth to be investigated. During the stereo-validation procedure of the innovative STC imaging system, several image pairs of an anorthosite sample and a modelled piece of concrete have been acquired under different illumination angles. This set of images has been used to test the effects of the compression algorithm (Langevin and Forni, 2000) on the accuracy of the DTM produced by dense image matching. Different configurations taking in account at the same time both the illumination of the surface and the compression ratio, have been considered. The accuracy of the DTMs is evaluated by comparison with a high resolution laser-scan acquisition of the same targets. The error assessment included also an analysis on the image plane indicating the influence of the compression procedure on the image measurements.

ACS Style

C. Re; E. Simioni; G. Cremonese; R. Roncella; G. Forlani; Y. Langevin; V. Da Deppo; G. Naletto; G. Salemi. ESTIMATE OF DTM DEGRADATION DUE TO IMAGE COMPRESSION FOR THE STEREO CAMERA OF THE BEPICOLOMBO MISSION. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences 2016, XLI-B4, 471 -478.

AMA Style

C. Re, E. Simioni, G. Cremonese, R. Roncella, G. Forlani, Y. Langevin, V. Da Deppo, G. Naletto, G. Salemi. ESTIMATE OF DTM DEGRADATION DUE TO IMAGE COMPRESSION FOR THE STEREO CAMERA OF THE BEPICOLOMBO MISSION. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. 2016; XLI-B4 ():471-478.

Chicago/Turabian Style

C. Re; E. Simioni; G. Cremonese; R. Roncella; G. Forlani; Y. Langevin; V. Da Deppo; G. Naletto; G. Salemi. 2016. "ESTIMATE OF DTM DEGRADATION DUE TO IMAGE COMPRESSION FOR THE STEREO CAMERA OF THE BEPICOLOMBO MISSION." The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B4, no. : 471-478.