UAV-Borne photogrammetry: a low cost 3D surveying methodology for cartographic update

Crepaldi, Gabriella; Piemonte, Andrea; Nespoli, Riccado

doi:10.1051/matecconf/201712009005

Cited by 11 publications

(4 citation statements)

References 19 publications

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“…Typically, information supporting territorial and urban planning is updated every 10-15 years. Using photogrammetry, cartographic databases for local-scale projects can be updated in a shorter time frame [15].…”

Section: Introductionmentioning

confidence: 99%

Integrated Surveying, from Laser Scanning to UAV Systems, for Detailed Documentation of Architectural and Archeological Heritage

Calisi,

Botta,

Cannata

2023

Drones

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Nowadays, the study and digitization of historical, architectural, and archaeological heritage are extremely important, covering the creation of digital twins—virtual replicas of real spaces and environments. Such reconstructions can be achieved using technologies with passive or active light sensors: laser scanners as light emitters, or photogrammetry through the creation of photographic images. As for the latter case, a distinction must be made between terrestrial and aerial shots, increasingly facilitated by the spread of UAV systems. Point clouds are aligned using georeferenced points measured with a total station. To create a faithful virtual model of the subjects, dense point clouds from a laser scanner are used to generate meshes, which are textured in high resolution from aerial and terrestrial photographs. All techniques can be integrated with each other, as demonstrated through the experiences of two case studies, each serving different purposes. The first is a detailed survey conducted for CAD representation of certain areas of Rocca Farnese in Capodimonte. The second is an instrumental survey for the creation of a realistic digital twin, aimed at providing an immersive VR experience of the archaeological area of Santa Croce in Gerusalemme in Rome.

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Section: Introductionmentioning

confidence: 99%

Integrated Surveying, from Laser Scanning to UAV Systems, for Detailed Documentation of Architectural and Archeological Heritage

Calisi,

Botta,

Cannata

2023

Drones

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“…This value was considered precautionary. Agisoft PhotoScan allows weights parameters during bundle block adjustment (BBA): tie points estimation are generally three times less relevant than GCPs accuracy during the reconstruction phase [17]. Thus, a value equal to 3 was set in its parameterization.…”

Section: First Step: Setting-up Workpace and Datasetmentioning

confidence: 99%

Combining Interior Orientation Variables to Predict the Accuracy of Rpas–Sfm 3D Models

et al. 2020

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Remotely piloted aerial systems (RPAS) have been recognized as an effective low-cost tool to acquire photogrammetric data of low accessible areas reducing collection and processing time. Data processing techniques like structure from motion (SfM) and multiview stereo (MVS) techniques, can nowadays provide detailed 3D models with an accuracy comparable to the one generated by other conventional approaches. Accuracy of RPAS-based measures is strongly dependent on the type of adopted sensors. Nevertheless, up to now, no investigation was done about relationships between camera calibration parameters and final accuracy of measures. In this work, authors tried to fill this gap by exploring those dependencies with the aim of proposing a prediction function able to quantify the potential final error in respect of camera parameters. Predictive functions were estimated by combining multivariate and linear statistical techniques. Four photogrammetric RPAS acquisitions were considered, supported by ground surveys, to calibrate the predictive model while a further acquisition was used to test and validate it. Results are preliminary, but promising. The calibrated predictive functions relating camera internal orientation (I.O.) parameters with final accuracy of measures (root mean squared error) showed high reliability and accuracy.

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“…Following the occurrence of strong seismic events, such as those ones that took place during the year 2016 in Central Italy, along the Apennine ridge, the issues concerning the importance of applying the discoveries and innovative features of geomatics researches to the field of rapid mapping arose again [Caroti et al, 2017b]. In fact, in order to manage the emergency phases, to arrange safety and recovery measures and to decide which areas were accessible or non-accessible, it was required to test and validate the application of innovative survey solutions.…”

Section: Geomatics Applied To Disaster Managementmentioning

confidence: 99%

Assessment of Earthquake-Induced Damage Level on Buildings: Analysis of Two Different Survey Methods for a Case Study

Croce

Crepaldi

Piemonte

2019

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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Commission II, WG II/8 ABSTRACT:Purpose of this paper is to compare different methods for the assessment of earthquake-induced damage on buildings based on survey data, referring to the case study of Castelluccio di Norcia. The seismic events that occurred in Central Italy in 2016 threatened the future of many villages located along the Apennine ridge straddling the Regions of Umbria, Marche, Abruzzo and Lazio: in Castelluccio di Norcia, a minor historical center in the Municipality of Norcia (Umbria), the earthquake occurred on August the 24 th caused some damage on localized buildings, but the strongest seismic event -the one occurred on October the 30 th and with magnitude Mw 6.5, provoked numerous collapses and widespread failure on several buildings of the village, razing to the ground almost the 60% of the built heritage. After the two earthquakes respectively, the Fire Brigade organized a reconnaissance campaign and flew over the village via UAVs (Unmanned Aerial Vehicles). By acquiring the videos recorded in this framework, that are currently available on the net and originally not recorded for specific survey purposes, the authors produced 3D models of the village allowing to compare the configuration of Castelluccio in the phases pre-and post-the destructive event of 30 th October: in fact, since the level of damage after the earthquake of August the 24 th was very low, the model resulting from the video recorded after this earthquake could be used as a model showing the layout of the village before the main struck of October. The result of this study is the Damage Degree Evaluation (DDE) and the following definition of a map showing for each building its class of damage, according to the distinction provided by European Macro-seismic Scale EMS98. On the other hand, another damage level map was studied: the Civil Protection requested, immediately after the earthquake and for the management of disaster response activities, the activation of the COPERNICUS project, providing for the detection of most damaged buildings of the village for an early census of the non-safe areas. The map of the damage level produced within this project is of course more accurate and precise, since it was collected through different acquisition systems: UAV, close-range photogrammetry, LiDAR (Light Detection And Ranging) and SLAM (Simultaneous Location and Mapping)-based mapping. This paper proposes a comparison between the two different DDEs, in order to define whether the first method, even if based on data downloaded via the web and therefore at lower resolution, and even if acquired with a more rapid evaluation procedure not providing for ground-based surveys, can lead to the construction of damage level maps that are plausible and realistic. The question is if the first method of DDE, even if less accurate, can allow to obtain results that are satisfactory and useful in the process of management and monitoring of natural hazards, providing support for the several implied institutions, in terms of information on catastrophe...

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UAV-Borne photogrammetry: a low cost 3D surveying methodology for cartographic update

Cited by 11 publications

References 19 publications

Integrated Surveying, from Laser Scanning to UAV Systems, for Detailed Documentation of Architectural and Archeological Heritage

Integrated Surveying, from Laser Scanning to UAV Systems, for Detailed Documentation of Architectural and Archeological Heritage

Combining Interior Orientation Variables to Predict the Accuracy of Rpas–Sfm 3D Models

Assessment of Earthquake-Induced Damage Level on Buildings: Analysis of Two Different Survey Methods for a Case Study

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