Visual enhancement of 3D images of rock faces for fracture mapping

Lai, Po Kong; Samson, C.; Bose, Prosenjit

doi:10.1016/j.ijrmms.2014.09.016

Cited by 16 publications

(4 citation statements)

References 24 publications

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“…post-flood analysis), though issues with georeferencing, reliability, accuracy and precision remain (Boulos et al, 2011). In general, as our ability to acquire input data improves, managing data volumes and identifying efficient methods of generating and intelligently decimating point clouds (Lai et al, 2014;Morales et al, 2011) represents the main bottleneck for the future development of SfM-MVS.…”

Section: Looking Forward: the Potential Of Sfm-mvsmentioning

confidence: 99%

Structure from motion photogrammetry in physical geography

Smith

Carrivick

Quincey

2015

Progress in Physical Geography: Earth and Environment

613

518

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3 4Accurate, precise and rapid acquisition of topographic data is fundamental to many 5 sub-disciplines of physical geography. Technological developments over the past few 6 decades have made fully distributed data sets of centimetric resolution and accuracy 7commonplace; yet the emergence of Structure from Motion (SfM) with Multi-View 8 Stereo (MVS) in recent years has revolutionised three-dimensional topographic surveys 9in physical geography by democratising data collection and processing. SfM-MVS 10 originates from the fields of computer vision and photogrammetry, requires minimal 11 expensive equipment or specialist expertise, and under certain conditions can produce 12 point clouds of comparable quality to existing survey methods (e.g. Terrestrial Laser 13 Scanning). Consequently, applications of SfM-MVS in physical geography have 14 multiplied rapidly. There are many practical options available to physical geographers 15 when planning a SfM-MVS survey (e.g. platforms, cameras, software); yet, many 16 focused SfM-MVS end-users are uncertain as to the errors associated with each choice 17 and, perhaps most fundamentally, the processes actually taking place as part of the 18 SfM-MVS workflow. This paper details the typical workflow applied by SfM-MVS 19 software packages, reviews practical details of implementing SfM-MVS, combines 20 existing validation studies to assess practically achievable data quality and reviews the 21 Real-time kinetic (RTK) surveys are commonplace in physical geography where a direct 113

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Section: Looking Forward: the Potential Of Sfm-mvsmentioning

confidence: 99%

Structure from motion photogrammetry in physical geography

Smith

Carrivick

Quincey

2015

Progress in Physical Geography: Earth and Environment

613

518

View full text Add to dashboard Cite

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“…If the 3-D comparison method was used, the volume variation was calculated as follows. Firstly, for each scenario, a mesh was generated using the Delaunay triangulation or the Poisson reconstruction [46]. Then, the intersection of both meshes was selected, and both were merged into a closed mesh.…”

Section: Discussionmentioning

confidence: 99%

“…The calculation of height variations was performed through the comparison of high-detail 3-D datasets (more than seven scans were conducted in a 300 m 2 area) using the M3C2 algorithm. Previous works gridded the cloud using a 1 m by 1 m cell [46][47][48], or 2 m by 2 m [29], and calculated height variations through the Difference of DEMs method (DoD). This process led to a reduction in the definition of such variations.…”

Section: Discussionmentioning

confidence: 99%

3-D Morphological Change Analysis of a Beach with Seagrass Berm Using a Terrestrial Laser Scanner

Corbí

Riquelme

Megías-Baños

et al. 2018

IJGI

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Along many Mediterranean coasts, the detached seagrass material of Posidonia oceanica creates seagrass berms that control the structure and morphodynamics of sandy beaches. Here, we show how Terrestrial Laser Scanner remote sensing data allows analyzing the 3-D morphologic change of beaches where this characteristic geomorphic structure is present. We propose a methodology for estimating accretion/erosion (almost −200 m 3 in our study) by considering the sand dominated and seagrass berms as two independent elements. For this purpose, two different sampling dates (named scenarios A and B, before and after an erosive heavy storms period, respectively) recorded in a microtidal pocket-beach (300 m 2 ) with these characteristic geomorphic structures have been modeled in 3-D. The present approach constitutes a cost-efficient, accurate, and quick tool to survey the sand volume in natural and artificial replenished beaches. The innovative approach, which can be considered as a conceptual and methodological starting point, can be useful to examine long-term and high-precision data sets in future studies of the morphodynamic evolution of these characteristic Mediterranean beaches.

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“…The application of remote sensing methods for discontinuity mapping has increased significantly in the last decade. There are several applications of remote sensing techniques in rock engineering practice, such as rock mass characterization (Tonon and Kottenstette, 2006); (Ferrero et al, 2009); (Lato et al, 2009), (Lato et al, 2010); (Gigli and Casagli, 2011); (Lato et al, 2013); (Otoo et al, 2013); (Deliormanli et al, 2014); (Lai et al, 2014), rock slope stability (Strouth et al, 2006); (Ghirotti and Genevois, 2007); (Sturzenegger and Stead, 2009); (Lato and Vöge, 2011); (Lato et al, 2012); (Lato et al, 2015); (Tuckey and Stead, 2016) and underground excavations (Fekete et al, 2010); (Styles et al, 2010); (Fekete and Diederichs, 2013); (Lato and Diederichs, 2014); (Preston et al, 2014); (Walton et al, 2014); (Cacciari and Futai, 2017); (Delaloye et al, 2015); (Villalobos et al, 2017).…”

Section: Methodsmentioning

confidence: 99%

Evaluación de la estabilidad alrededor de un túnel ferroviario usando los datos de un escáner láser y el análisis de elementos finitos

2020

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Geotechnical analysis of tunnels in complex geo-structural environments requires an advanced understanding of the inter-block structure effect on rock mass behavior, such as joints and fractures systems, bedding and foliation planes, among other discontinuity types. The conventional approach for preliminary geotechnical analysis of tunnels is based on a continuous-equivalent system representation of rock mass, i.e. without explicit consideration of systematic discontinuity systems. However, to obtain a closer to reality results of the rock mass expected behavior, geo-structural data should be included from the initial stage of geotechnical analysis. A case study is used to analyze the implications of the discontinuity systems inclusion on the rock mass stability around tunnel. Two-dimensional finite element numerical models were developed using three different models to the generation of rock discontinuity systems. The obtained results show that fracture intensity parameter help to generated more realistic two-dimensional DFNs.

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Visual enhancement of 3D images of rock faces for fracture mapping

Cited by 16 publications

References 24 publications

Structure from motion photogrammetry in physical geography

Structure from motion photogrammetry in physical geography

3-D Morphological Change Analysis of a Beach with Seagrass Berm Using a Terrestrial Laser Scanner

Evaluación de la estabilidad alrededor de un túnel ferroviario usando los datos de un escáner láser y el análisis de elementos finitos

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