Improvements in the integration of remote sensing and rock slope modelling

Francioni, Mirko; Salvini, Riccardo; Stead, Doug; Coggan, John

doi:10.1007/s11069-017-3116-8

Cited by 50 publications

(33 citation statements)

References 57 publications

(84 reference statements)

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“…In this research, we proposed a new approach which aimed to substantially reduce the cost and time associated with the use of DP in the analysis of rock slopes. DP, without doubt, represents one of the most cost-effective survey techniques used in many branches of the geosciences [8]. However, in engineering geological studies, the DP 3D model has to be georeferenced in order to extract feature dimensions and the dip and dip direction of geological features.…”

Section: Discussionmentioning

confidence: 99%

“…2019, 11, 1267 6 of 24 from motion (SfM) method is ca 80% [14], for a distance between the camera and the object of ca 10 m, the baseline was set at ca 2.6 m ( Figure 4B). The survey was conducted using the image fan method [7,8] (Figure 4C); when using such a method, the photographs are captured from specific camera locations (which are not independent). This easily defines, for the DP stations, the area acquired by each photograph and guarantees the correct overlap.…”

Section: Dp Surveys With Calibrated and Non-calibrated Camerasmentioning

confidence: 99%

“…Three main types of acquisition methods can be used: independent convergent, image fan and image strip methods. These methods are explained in detail by Birch [7] and Francioni et al [8], and their application is discussed by Sturzenegger and Stead [9]. Similar to LS, DP can be acquired from several platforms, such as a helicopter, aircraft and UAV.…”

Section: Introductionmentioning

confidence: 99%

“…Similar to LS, DP can be acquired from several platforms, such as a helicopter, aircraft and UAV. The advantages and limitations of each platform are discussed by Francioni et al [8], where it is highlighted that terrestrial hand-held (or tripod-based) DP is the easiest and cheapest method. A limitation associated with this method is the possible presence of occlusions causing holes (zero data) in the point cloud in the case of very high slopes.…”

Section: Introductionmentioning

confidence: 99%

“…This limitation can be overcome using helicopters, aerial balloons and UAV platforms, but the cost and the complexity of the survey can increase. In fact, when using a hand-held camera, the cost of DP is very low and mainly related to the resolution and quality of the camera [8].…”

Section: Introductionmentioning

confidence: 99%

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A New Fast and Low-Cost Photogrammetry Method for the Engineering Characterization of Rock Slopes

et al. 2019

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Digital photogrammetry (DP) represents one of the most used survey techniques in engineering geology. The availability of new high-resolution digital cameras and photogrammetry software has led to a step-change increase in the quality of engineering and structural geological data that can be collected. In particular, the introduction of the structure from motion methodology has led to a significant increase in the routine uses of photogrammetry in geological and engineering geological practice, making this method of survey easier and more attractive. Using structure from motion methods, the creation of photogrammetric 3D models is now easier and faster, however the use of ground control points to scale/geo-reference the models are still required. This often leads to the necessity of using total stations or Global Positioning System (GPS) for the acquisition of ground control points. Although the integrated use of digital photogrammetry and total station/GPS is now common practice, it is clear that this may not always be practical or economically convenient due to the increase in cost of the survey. To address these issues, this research proposes a new method of utilizing photogrammetry for the creation of georeferenced and scaled 3D models not requiring the use of total stations and GPS. The method is based on the use of an object of known geometry located on the outcrop during the survey. Targets located on such objects are used as ground control points and their coordinates are calculated using a simple geological compass and trigonometric formula or CAD 3D software. We present three different levels of survey using (i) a calibrated digital camera, (ii) a non-calibrated digital camera and (iii) two commercial smartphones. The data obtained using the proposed approach and the three levels of survey methods have been validated against a laser scanning (LS) point cloud. Through this validation we highlight the advantages and limitations of the proposed method, suggesting potential applications in engineering geology.

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Section: Discussionmentioning

confidence: 99%

Section: Dp Surveys With Calibrated and Non-calibrated Camerasmentioning

confidence: 99%