Evaluation of Photogrammetric Block Orientation Using Quality Descriptors From Statistically Filtered Tie Points

Calantropio, Alessio; Deseilligny, Marc Pierrot; Rinaudo, Fulvio; Rupnik, Ewelina

doi:10.5194/isprs-archives-xlii-2-185-2018

Cited by 8 publications

(5 citation statements)

References 11 publications

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“…Regarding the estimation accuracy of the Internal Orientation parameters, a GUI (Graphical User Interface) named GEMINI (Graphically Enhanced MicMac's New Interface), specifically designed for assessing the quality of photogrammetric block orientation, has been used (Calantropio et al, 2018b). The purpose of GEMINI is not only to present a user-friendly environment; its main aim is to allow the user to understand and criticise the obtained results systematically in a guided way, preserving the automation of the process.…”

Section: Data Processing Methodsmentioning

confidence: 99%

Use and Evaluation of a Short Range Small Quadcopter and a Portable Imaging Laser for Built Heritage 3d Documentation

Calantropio

Chiabrando

Rinaudo

et al. 2018

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

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Abstract. The market of imaging and non-imaging sensors offers nowadays a wide range of products, which are constantly improving and growing. Given the recent advances in the miniaturization of devices for metric survey, and the relatively cheap COTS (Commercial Off The Shelf) solutions widely available, it is therefore crucial to optimally exploit, calibrate and evaluate the performance for 3D data acquisition of the new available devices. These issues are part of the latest research addresses of different Geomatics groups, with the aim to analyze and evaluate these new sensors, in order to discover their real potentialities which are not only connected to their interesting design, low price and small dimensions.According to the final objective of the research, which is the realization of 3D metric survey of a Cultural Heritage site using different techniques and methods, one small UAV (Unmanned Aerial Vehicle) and a portable TLS (Terrestrial Laser Scanner) have been employed. The acquisition strategies and the processing methods are discussed, and the quality of the achievable results is analysed, together with an evaluation of the sensors and the outline of the best practices and use cases scenarios.

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Section: Data Processing Methodsmentioning

confidence: 99%

Use and Evaluation of a Short Range Small Quadcopter and a Portable Imaging Laser for Built Heritage 3d Documentation

Calantropio

Chiabrando

Rinaudo

et al. 2018

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

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“…Photogrammetry has proven, in the last decade, to be a reliable and cost-effective survey technique presenting undoubtedly advantages with respect to other metric survey methodologies [36]. Because of the impossibility of performing a UAV photogrammetric survey in the archaeological site of the VOK, a terrestrial survey was conducted instead.…”

Section: Photogrammetric Surveymentioning

confidence: 99%

Integrated Geophysics and Geomatics Surveys in the Valley of the Kings

Porcelli

Sambuelli

Comina

et al. 2020

Sensors

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Recent results within the framework of the collaborative project The Complete Geophysical Survey of the Valley of the Kings (VOK) (Luxor, Egypt) are reported in this article. In October 2018, a team of geomatics and geophysics researchers coordinated by the Polytechnic University of Turin worked side by side in the VOK. Topographic measurements in support of geophysical surveys and the achievement of a very large-scale 3D map of the Eastern VOK were the two main objectives of the geomatics campaign. Innovative 3D metric technologies and methods, based on terrestrial laser scanning (both static and mobile) and close-range photogrammetry were employed by the Geomatics team. The geophysical campaign focused on the acquisition of Electrical Resistivity Tomography (ERT), Ground Penetrating Radar (GPR) and high spatial density Geomagnetic (GM) data. ERT new data around KV62, both inverted in 2D sections and added to the previous ones to perform a new global 3D inversion, confirm the previous results showing both conductive and resistive anomalies that have to be explained. GPR timeslices showed some interesting features in the area in front of the KV2 entrance where GM gradient map also presents localized anomalies. In the area SSW of the KV2 the GM gradient maps evidenced also a large semicircular anomaly which, up to now, has no explanation. The potentialities of using magnetic techniques as a complement to other non-invasive techniques in the search for structures of archeological significance have been explored. The application of modern and innovative methods of 3D metric survey enabled to achieve a complete 3D mapping of what is currently visible in the valley. The integration of 2D/3D mapping data concerning visible elements and hypothetical anomalies, together with the recovering in the same global reference system of underground documentation pertaining to the Theban Mapping Project, prefigure the enhancement of multi-temporal site representation. This strategy enables the fruition development of the already discovered archaeological heritage, using modern criteria of valorization and conservation.

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“…Since the tie-points are matched according to the feature spots detected, it might be useful to upscale source images to localize tie-points more accurately. However a higher number of tie-points does not necessarily correspond to a correct alignment (Calantropio et al, 2018); therefore, filters should be used only when consistent results cannot be obtained due to poor quality of the original images, as they might introduce an undesired level of noise (and a higher reprojection error). The exploratory considerations done so far will serve for an extensive benchmarking (cloud-to-cloud, density and roughness, analysis), that can be undertaken for an in-depth assessment of the presented filters.…”

Section: Image Enhancement Filtersmentioning

confidence: 99%

Image Pre-Processing Strategies for Enhancing Photogrammetric 3d Reconstruction of Underwater Shipwreck Datasets

Calantropio

Chiabrando

Seymour

et al. 2020

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

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Abstract. Although underwater photogrammetry has become widely adopted, there are still significant unresolved issues that are worthy of attention. This article focuses on the 3D model generation of underwater shipwrecks and intends explicitly to address the problem of dealing with sub-optimal datasets. Even if the definition of best practices and standards to be adopted during the acquisition phase appears to be crucial, there is a massive amount of data gathered so far by professionals and the scientific community all over the world that cannot be ignored. The compelling idea is to attempt to achieve the best reconstruction results possible, even from sub-optimal or less-than-ideal image datasets. This work focuses on the investigation of different strategies and approaches for balancing the quality of the photogrammetric products, without neglecting their reliability concerning the surveyed object. The case study of this research is the Mandalay MHT, a 34 m long steel-hulled auxiliary schooner that sank in 1966 and now lies in the Biscayne National Park (Florida - USA). The dataset has been provided by the Submerged Resources Center (SRC) of the US National Park Service, in order to develop an experimental image enhancement method functional to the virtualization and visualization of the generated products, as a part of a sustainable, affordable, and reliable method of studying submerged artefacts and sites. The original images have been processed using different image enhancement approaches, and the outputs have been compared and analysed.

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Evaluation of Photogrammetric Block Orientation Using Quality Descriptors From Statistically Filtered Tie Points

Cited by 8 publications

References 11 publications

Use and Evaluation of a Short Range Small Quadcopter and a Portable Imaging Laser for Built Heritage 3d Documentation

Use and Evaluation of a Short Range Small Quadcopter and a Portable Imaging Laser for Built Heritage 3d Documentation

Integrated Geophysics and Geomatics Surveys in the Valley of the Kings

Image Pre-Processing Strategies for Enhancing Photogrammetric 3d Reconstruction of Underwater Shipwreck Datasets

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