Facets : A Cloudcompare Plugin to Extract Geological Planes From Unstructured 3d Point Clouds

Dewez, Thomas; Girardeau-Montaut, D.; Allanic, C.; Rohmer, Jérémy

doi:10.5194/isprsarchives-xli-b5-799-2016

Cited by 69 publications

(54 citation statements)

References 3 publications

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“…Planes that appear in geological outcrops provide useful information to the practitioner, for example, the sedimentation formation, structural or tectonic history and rock mass quality. Recently, Dewez et al (2016) developed a dedicated structural geology plugin called FACET within CloudCompare which is an open source software. It is mainly to accomplish planar facet extraction in order to compute their dip and dip direction.…”

Section: Introductionmentioning

confidence: 99%

Photogrammetry approach on geological plane extraction using CloudCompare FACET plugin and scanline survey

Nagendran¹,

Ismail²,

Wen³

2019

BGSM

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Photogrammetry advancement in the field of geotechnics is able to provide useful preliminary data in a short time and with minimum resources. The data acquisition for photogrammetry processing was done utilizing the imagery from a low-cost unmanned aerial vehicle (UAV). Commercial drone by DJI, Phantom 4 Pro was used to take aerial and side images of the rock slope. Good overlapping of the images is very important to generate a very dense 3D model. Ground control point was established to georeferenced the output of photogrammetry, so that it represents the real site scale and coordinates. Photogrammetry using structure from motion technique (SfM) is able to generate three-dimensional model of the specified study area. 3-D model of the rock slope was analyzed to extract the geological planes using CloudCompare software with the aid of FACET plugin. 3-D dense cloud point generated from the photogrammetry process was the input file to the CloudCompare software. Traditional method of using scan line survey was carried out to check the adequacy of the geological plane extraction data from photogrammetry survey output. Extraction of geological planes through FACET plugin provides information on major discontinuity sets and the orientation of the planes. Then, the dip/ dip direction obtained was compared with scanline survey. The discontinuity datasets obtained from the CloudCompare was compared with the scan line survey. Results showed the difference is not more than 20 %. Therefore, application of photogrammetry through CloudCompare software provides reliable and accurate measurement.

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Section: Introductionmentioning

confidence: 99%

Photogrammetry approach on geological plane extraction using CloudCompare FACET plugin and scanline survey

Nagendran¹,

Ismail²,

Wen³

2019

BGSM

View full text Add to dashboard Cite

show abstract

“…Dense point cloud from the photogrammetry process is then imported into a freeware called CloudCompare. FACET is a plugin introduced by Dewez et al (2016) to perform geological plane extraction, the facets can be exported in the format Comma-Seperated-Variable (CSV) ASCII file and shape files for kinematic analysis in other software. In this study, Dips Version 7.0 software from Rocscience was used to perform the kinematic analysis.…”

Section: Methodsmentioning

confidence: 99%

Integration of UAV photogrammetry and kinematic analysis for rock slope stability assessment

Nagendran¹,

Ismail²,

Tung³

2019

BGSM

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Rock slope excavation is unpreventable due to some location of infrastructure development must cut through rock hills. Therefore, an appropriate rock slope characterization should be carried out in order to prevent any possible failure. Recent advancement of drone technology has enabled the preliminary assessment on geotechnical characterization to be done in a short period of time. This paper mainly focuses on extraction of orientation and discontinuity features from drone imagery through the application of photogrammetry for rock slope stability assessment. Kinematic analysis is a method used to analyze the various modes of potential rock slope failures such as planar sliding, wedge sliding and flexural toppling that occur due to the presence of unfavorable oriented discontinuities. A drone was used to capture images from aerial and sideways, then imported to photogrammetry software to be processed. The output of the photogrammetry which is the dense cloud point would then be imported into a cloud compare software for the kinematic analysis. The orientations of discontinuities that has been extracted from the rock slope using CloudCompare software was imported into Rocscience Dips Version 7.0 software. The kinematic analysis feature of this software provides a quick check for various rock slope stability failure modes on a stereonet plot, such as planar sliding, wedge sliding and flexural toppling with just input on slope orientation, friction angle and lateral limits, before selecting the failure modes. By using discontinuity data, the kinematic analysis shows that the rock slope has 15.40% risk for planar sliding, 7.16% for wedge sliding and 1.33% for flexural toppling. Hence, the use of UAV as a tool in rock slope characterization is reliable because it can provide valuable preliminary information on rock slope stability assessment.

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“…The widening use of SfMphotogrammetry is driving parallel advances in analysis tools for 3-D point clouds (e.g. CloudCompare software www.cloudcompare.org, with plugins such as Facets [Dewez et al 2016] and Compass [Thiele et al 2017a] relevant to structural and morphological analyses).…”

Section: Geological and Geomorphological Mappingmentioning

confidence: 99%

Volcanological applications of unoccupied aircraft systems (UAS): Developments, strategies, and future challenges

James

Carr²,

D'Arcy³

et al. 2020

Volcanica

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Unoccupied aircraft systems (UAS) are developing into fundamental tools for tackling the grand challenges in volcanology; here, we review the systems used and their diverse applications. UAS can typically provide image and topographic data at two orders of magnitude better spatial resolution than space-based remote sensing, and close-range observations at temporal resolutions down to those of video frame rates. Responsive deployments facilitate dense time-series measurements, unique opportunities for geophysical surveys, sample collection from hostile environments such as volcanic plumes and crater lakes, and emergency deployment of ground-based sensors (and robots) into hazardous regions. UAS have already been used to support hazard management and decisionmakers during eruptive crises. As technologies advance, increased system capabilities, autonomy, and availabilitysupported by more diverse and lighter-weight sensors-will offer unparalleled potential for hazard monitoring. UAS are expected to provide opportunities for pivotal advances in our understanding of complex physical and chemical volcanic processes. Non-technical SummaryUnoccupied aircraft systems (UAS) are developing into essential tools for understanding and monitoring volcanoes. UAS can typically provide much more detailed imagery and 3-D maps of the Earth's surface, and more frequently, than satellites are able to. They can also make measurements and collect samples for geochemical analysis from hazardous regions such as volcanic plumes and near active vents. Through being quick to deploy, they offer key advantages during initial stages of volcano unrest as well as throughout eruptions. Data from UAS have already been used to support hazard management and decision-makers during crises. In the future, UAS will become increasingly capable of flying longer and more complex missions, more autonomously and with more sophisticated sensors, and are likely to become key components of broader sensor networks for monitoring and research.

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Facets : A Cloudcompare Plugin to Extract Geological Planes From Unstructured 3d Point Clouds

Cited by 69 publications

References 3 publications

Photogrammetry approach on geological plane extraction using CloudCompare FACET plugin and scanline survey

Photogrammetry approach on geological plane extraction using CloudCompare FACET plugin and scanline survey

Integration of UAV photogrammetry and kinematic analysis for rock slope stability assessment

Volcanological applications of unoccupied aircraft systems (UAS): Developments, strategies, and future challenges

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