GNNS Control Network Supporting Large Historical Building Architectural Survey

Bonora, Valentina; Maseroli, R.; Mugnai, Francesco; Tucci, Grazia

doi:10.5194/isprs-archives-xlvi-m-1-2021-87-2021

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…In 2020, Pitti Palace was the subject of an extensive 3D survey campaign carried out by the Geco Lab of the University of Florence as part of a research agreement. The campaign included the implementation of a control network carried out with well-established topographic systems (GPS and total station) and the use of 3D scanning and Structure-from-Motion (SfM) photogrammetry for the architectural survey (Bonora et al, 2021). All the interior and exterior spaces of the palace have been documented, not only in terms of their geometric features but also in terms of their management, use, current and past designations, finishes, materials, and state of conservation.…”

Section: Pitti Palacementioning

confidence: 99%

Between Spatial and Archival Data: Digital Humanities for the History of a Staircase of Pitti Palace

Fiorini

Conti

Meucci

et al. 2023

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

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Abstract. In the last decades, surveys produced with geomatic techniques are increasingly used for the study and conservation of the built heritage because they automatically collect large amounts of data with an accuracy and objectivity that could not be achieved with traditional techniques. As in other fields of digital and spatial humanities, the combination of spatial data with archival and secondary sources provides new tools for reconstructing the history, construction, and transformation of a historic architecture.The new digital survey of Pitti Palace, which was carried out between 2019 and 2021, has revealed aspects neglected by previous surveys and historical studies. Pitti Palace is the largest historical civil building in Florence. In the 16th century, Bartolomeo Ammannati carried out important extensions, including the so-called "spiral staircase", one of the most important staircases in the palace. This staircase, of which there is little documentation, although it is considered a masterpiece, was demolished at the beginning of the 19th century by Pasquale Poccianti to make way for the "New Secondary Staircase", on which previous studies have focused mainly on stylistic and decorative aspects.Using digital spatial data as a primary source, the research aimed to explain the construction history of the new staircase built by Poccianti, allowing a precise comparison between the archive documents and the actual geometry of the building elements.It also highlights previously undocumented features, including the evidence for the Ammannati staircase and the important changes made during the construction of the new staircase. The article shows how the insertion of the new staircase profoundly altered the design, structure and layout of a wing of the Pitti Palace. It also suggests how a more transdisciplinary and holistic approach helps the study of historical architecture.

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Section: Pitti Palacementioning

confidence: 99%

Between Spatial and Archival Data: Digital Humanities for the History of a Staircase of Pitti Palace

Fiorini

Conti

Meucci

et al. 2023

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

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“…Depending on the type of representation that a performed topographic survey must deliver, a specific type of instrument can be adopted for the survey. For architectural drawing, for instance, 1:50 or 1:100 graphical outputs have often been used [24,25]. For other applications, such as vast landscape, landslides or riverbeds surveying, smaller than 1:1000 graphical scales have been used [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Analysis of Unmanned Aircraft Systems in Low Altitude Photogrammetric Surveys

Mugnai

Tucci

2022

Remote Sensing

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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 in a 5 ha area using a Phantom 4 Adv, Mavic 2 Pro, Mavic Air 2 and Mavic Mini 2. These unmanned aircrafts are commercial systems used mainly by private professionals. Some photogrammetric reconstructions were carried out by varying flight altitude and camera settings of the 4 UAS. Structure-from-motion (SfM) algorithms were applied to the images taken from the UASs. The surveys’ quality was analyzed by comparing the ground targets’ coordinates measured on the field with indirect georeferencing through global navigation satellite system (GNSS). Fifty targets were installed and arranged following a kind of regular grid. For each photogrammetric flight, the boundary conditions were maintained the same, as well as the flight trajectories and the ground control point distribution. Altimetric and planimetric residuals were reported and compared for each photogrammetric survey. Using a regular grid of ground targets, the result obtained from Phantom 4 is one order of magnitude better than the ones obtained from the other UASs. Mavic Mini 2 leads to an error average of about 5 cm. Remembering that the Mavic Mini 2 is an ultralight drone (it does not require a pilot’s license), it could significantly reduce costs compared to all the others.

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Performing low-altitude photogrammetric surveys, a comparative analysis of user-grade unmanned aircraft systems

Mugnai

Longinotti²,

Vezzosi³

et al. 2022

Appl Geomat

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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 photogrammetric surveys were conducted in a hilly area of about 5 ha using Phantom 4 Adv, Mavic 2 Pro, Mavic Air 2, and Mavic Mini 2. These unmanned aircrafts are commercial user–grade systems used mainly by private professionals. Several photogrammetric reconstructions were performed by varying essential parameters, such as flight altitude and cameras of remotely piloted aircraft systems (RPAS), applying structure-from-motion (SfM) algorithms to the images taken from the UAS. The surveys’ quality was analyzed by comparing the ground targets’ coordinates extrapolated from the point clouds to those measured on the field with indirect georeferencing through GNSS technology. Fifty targets were installed and arranged following a reasonably regular mesh. The boundary conditions were maintained the same for each flight mission, flight trajectories, and the ground control point distribution on the ground. For each survey made by each of the four UAS, altimetric and planimetric residuals were reported and compared. Average residuals from Phantom 4 Adv, about 15 mm, almost disappear compared to the other UASs; the discrepancy is one order of magnitude. With a regular grid geometry of ground targets, the Mavic Mini 2 led to an error average of about 5 cm. Remembering that the Mavic Mini 2 is an ultralight drone (does not require a pilot's license), it could significantly reduce cost compared to the other systems.

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GNNS Control Network Supporting Large Historical Building Architectural Survey

Cited by 4 publications

References 7 publications

Between Spatial and Archival Data: Digital Humanities for the History of a Staircase of Pitti Palace

Between Spatial and Archival Data: Digital Humanities for the History of a Staircase of Pitti Palace

A Comparative Analysis of Unmanned Aircraft Systems in Low Altitude Photogrammetric Surveys

Performing low-altitude photogrammetric surveys, a comparative analysis of user-grade unmanned aircraft systems

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