Construction and optimization method of the open-pit mine DEM based on the oblique photogrammetry generated DSM

Wang, Jiaheng; Wang, Liguan; Jia, Mingtao; Bi, Lin

doi:10.1016/j.measurement.2019.107322

Cited by 24 publications

(13 citation statements)

References 21 publications

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“…Another solution for thermal orthophotos production is increasing manual corresponding image point measurements, although it is a time consuming method in photogrammetry. Therefore sparse point cloud can be intensified so as to provide more discrete three-dimensional points for obtaining DSM models such as delaunay triangulation and inverse distance weighting (Wang et al, 2020). It is also seen that RGB and multispectral points' heights tend to similar distribution when their histogram analyzed (Fig.…”

Section: Control Points Accuraciesmentioning

confidence: 93%

Photogrammetric analysis of multispectral and thermal close-range images

Akçay

2021

Mersin Photogrammetry Journal

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PhotogrammetryRemote sensing Multispectral images Thermal images Close-range Sensors capable of multispectral and thermal imaging beyond visible bands offer many analysis possibilities for environmental monitoring. Different sensor images constitute an important source of information especially in the fields of agriculture, forestry, geology and energy. Photogrammetric studies have been affected by this development in recent years and have been used in the production of multispectral and thermal models besides the RGB model. However, due to geometric and radiometric resolution differences, it is difficult to combine or evaluate models produced from different types of sensors. In this study, the three-dimensional test field images obtained with RGB, multispectral and thermal sensors were oriented and modeled photogrammetrically. The accuracies of the control points on the produced models were compared and discussed. When the results are examined, control point accuracy was obtained as almost similar as in the RGB model after the orientation based on automatic feature matching. Automatic feature detection and matching in thermal images were not robustly produced due to low geometric resolution. For this reason, manual measurements were performed in thermal images, and the photogrammetric orientation and adjustment process was done accordingly. The fused evaluation approach considering RGB, multispectral and thermal images in one photogrammetric model was also implemented and discussed.

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Section: Control Points Accuraciesmentioning

confidence: 93%

Photogrammetric analysis of multispectral and thermal close-range images

Akçay

2021

Mersin Photogrammetry Journal

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“…The soft sphere model of the DEM method was used to study the movement of particles in the high-pressure tank [21][22][23]. The model of indirect contact force between particles was represented by the spring damper friction device.…”

Section: Physicalmentioning

confidence: 99%

Investigation into the Mechanism of the Steel Particle Feeding Process: A Numerical and Experimental Study

Xing

Wang³

et al. 2021

Geofluids

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The particle feeding system is a prerequisite for the realization of particle impact drilling technology. Because of the high density, the storage and flow of the steel particle are different from those of the other nonviscous particles. The differential equation of the particle movement was built with the liquid bridge force model and the discrete element method. The dynamic movement process and the distribution state of particles in the high-pressure tank were analyzed. For 1 mm steel particles, the mass flow rate decreased with the increase in water content. For 2 mm and 3 mm steel particles, the water content of 15% and 20% was the dividing point of the mass flow rate from increasing to decreasing. When the water content was 10% and 20%, the mass flow rate increased with the steel particle size. But when the water content was 30% and 40%, the mass flow rate decreased with the steel particle size. The study of the control mechanism of the uniformity and stability of particles showed that the funnel flow was the major reason causing the instability and blocking of the feeding process. This research results can provide a basis for the further improvement of the differential pressure feeding system.

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“…In DSM, the pits or fallen rocks on the ground are expressed in the form of elevation difference. Wang et al [35] proposed a method to extract the elevation feature points to represent the terrain changes. The feature points were extracted by the four directions (vertical, horizontal, 45 • left, 45 • right) scanning method based on the section scanning.…”

Section: Elevation Feature Points Extractionmentioning

confidence: 99%

A New Challenge: Path Planning for Autonomous Truck of Open-Pit Mines in The Last Transport Section

Zhao

2020

Applied Sciences

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During the operation of open-pit mining, the loading position of a haulage truck often changes, bringing a new challenge concerning how to plan an optimal truck transportation path considering the terrain factors. This paper proposes a path planning method based on a high-precision digital map. It contains two parts: (1) constructing a high-precision digital map of the cutting zone and (2) planning the optimal path based on the modified Hybrid A* algorithm. Firstly, we process the high-precision map based on different terrain feature factors to generate the obstacle cost map and surface roughness cost map of the cutting zone. Then, we fuse the two cost maps to generate the final cost map for path planning. Finally, we incorporate the contact cost between tire and ground to improve the node extension and path smoothing part of the Hybrid A* algorithm and further enhance the algorithm’s capability of avoiding the roughness. We use real elevation data with different terrain resolutions to perform random tests and the results show that, compared with the path without considering the terrain factors, the total transportation cost of the optimal path is reduced by 10%–20%. Moreover, the methods demonstrate robustness.

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Construction and optimization method of the open-pit mine DEM based on the oblique photogrammetry generated DSM

Cited by 24 publications

References 21 publications

Photogrammetric analysis of multispectral and thermal close-range images

Photogrammetric analysis of multispectral and thermal close-range images

Investigation into the Mechanism of the Steel Particle Feeding Process: A Numerical and Experimental Study

A New Challenge: Path Planning for Autonomous Truck of Open-Pit Mines in The Last Transport Section

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