Structural analysis of clastic dikes using Structure from Motion - Multi-View Stereo: a case-study in the Paraná Basin, southeastern Brazil

Viana, Camila Duelis; Grohmann, Carlos Henrique; Busarello, Mariana Dos Santos Toledo; Garcia, Guilherme Pereira Bento

doi:10.1590/2317-4889201800201898

Cited by 14 publications

(8 citation statements)

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“…For details of the processes and algorithms involved in the construction of 3D digital models, the reader is referred to Brown & Lowe (2005); James & Robson (2012) and Viana et al . (2018).…”

Section: Methodsmentioning

confidence: 99%

“…For discussions on advantages and disadvantages of different SfM-MVS-based software the reader is referred to Micheletti et al (2015), Smith et al (2016), Schwind & Starek (2017), Barbasiewicz et al (2018) and Fleming & Pavlis (2018). For details of the processes and algorithms involved in the construction of 3D digital models, the reader is referred to Brown & Lowe (2005); James & Robson (2012) and Viana et al (2018).…”

Section: Processing Of Virtual Outcropsmentioning

confidence: 99%

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Cross‐strata palaeocurrent analysis using virtual outcrops

et al. 2021

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Although virtual outcrops or digital outcrop model applications in geological studies are becoming increasingly common, virtually no attention has been given to acquisition of palaeocurrent data from cross-strata. Palaeocurrent indicators are abundant in the sedimentary record, mainly as cross-strata, and present compelling implications for basin analysis, plate tectonics and palaeoenvironmental reconstructions, as well as for sediment transport systems. Palaeocurrents from cross-strata also comprise a quantifiable parameter in sedimentary successions that can be used in quantitative modelling of depositional architecture with implications for reservoir characterization through outcrop analogue studies. A common obstacle in obtaining large cross-strata orientation datasets is the limited access to steep and high outcrop faces, as well as financial and time restrictions on field work. To overcome these issues, the simplest workflow for drone-based acquisition, photogrammetric processing and analysis of virtual outcrops aiming at the attainment of palaeocurrent data from cross-strata is appraised here. The results show that orientations of cross-beds measured on virtual outcrops, with and without ground control points, and using two different levels of resolution downsampling, are comparable to field measurements using analogue and electronic devices. Time and financial resources can thus be saved by using the straightforward method presented here to supplement palaeocurrent mapping across wide areas and distinct stratigraphic intervals.

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Section: Methodsmentioning

confidence: 99%

Section: Processing Of Virtual Outcropsmentioning

confidence: 99%

Cross‐strata palaeocurrent analysis using virtual outcrops

et al. 2021

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“…It has been used for some time by several authors in different areas of Geosciences [10,12,14,[19][20][21] The three-dimensional reconstruction of objects is not a new topic. It has been used for some time by several authors in different areas of Geosciences [10,12,14,[19][20][21], varying from simple uses to more complex ones, including the extraction of structural geology information such as orientations, dip and strike [6,[21][22][23][24][25][26][27], fractures [6,[28][29][30] and mapping different geological types of rocks from Digital Outcrop Models (DOM) [31,32].…”

Section: Technology State Of the Art And Backgroundmentioning

confidence: 99%

3-D Reconstruction of Rock Samples via Structure-From-Motion for Virtual Reality Applications: A Methodological Proposal

et al. 2022

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This article presents a methodological proposal for the three-dimensional reconstruction of rock samples via structure-from-motion. The presented methodological steps aimed to provide a reproducible workflow to create virtual rock samples to be applied in virtual applications. The proposed methodology works as a how-to guide as well as a preemptive troubleshooting guide for the complete process. Four geologists with different scholar levels volunteered to test this methodological proposal, applying it to three rock samples as the methodology steps were provided in an inverse-proportional manner to the graduate level. When analyzing the results of the performed reconstructions, all analyzed elements presented a proportional reduction due to the lack of information provided. An initial questionnaire was applied to verify the difficulties encountered, and subsequently, all volunteers received the complete methodology. In the second reconstruction, the results were equivalent to those obtained initially with the complete methodology. A technology acceptance model questionnaire was applied to determine the perception of utility and ease of use of the presented methodology. In both cases the results presented themselves in a positive way, indicating that the methodology was able to solve the problems found simply and objectively through a repeatable workflow.

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“…O processamento das fotografias aéreas para a geração do MDE e do MVA da mina foi realizado utilizando o software Agisoft Metashape, e segue o fluxo de trabalho SfM-MVS (Tavani et al, 2014;Carrivick et al, 2016;Tavani et al, 2016;Cawood et al, 2017;Viana et al, 2018). Uma explicação detalhada dos parâmetros e algoritmos envolvidos é compreensivamente abordada em Agisoft LLC (2019).…”

Section: Processamento De Imagensunclassified