Identification of outcropping strata from UAV oblique photogrammetric data using a spatial case-based reasoning model

Chen, Jianhua; Wang, Bingqian; Wang, Feng; Hou, Mingcai; Hu, Zuowei

doi:10.1016/j.jag.2021.102450

Cited by 2 publications

(3 citation statements)

References 65 publications

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“…In this study, the CASTEP module in Material Studio 2019 software was used for structural optimization and energy calculations. According to published computational results, this is a first-principles calculation based on DFT [17,21], using the stibnite structure (Sb2S3) with a Pbnm space group. A generalized functional gradient was used to approximate the GGA functional, and the mitigation correlation energy was described using the gradient correction function (PW91) proposed by Perdew and Wang.…”

Section: Computational Detailsmentioning

confidence: 99%

“…Quantum chemistry has been increasingly used to obtain microscopic information about minerals [15]. First-principles calculations based on density functional theory (DFT) have become an important research tool in flotation chemistry [16,17]. DFT is reliable in evaluating the chemical characteristics of flotation agents and the surface energy of minerals [18,19].…”

Section: Introductionmentioning

confidence: 99%

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Activation mechanisms of Cu 2+ and Pb 2+ in stibnite flotation

Xiao

Cui

Tong

et al. 2023

Preprint

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Different activation mechanisms of Cu2+ and Pb2+ in stibnite flotation were studied via microflotation and adsorption capacity tests and density functional theory (DFT). Microflotation experiments indicated that the recovery rate of stibnite flotation with butyl xanthate (BX) was activated 7.82% higher by Pb2+ than Cu2+. The presence of Pb2+ increased the amount of adsorbed BX on the stibnite surface. The results of DFT also suggested stronger activation by Pb2+. Cu2+ activation induced the formation of Cu-S bonds between the double-bonded S1 atom of BX with Cu, resulting in electron gain. Pb2+ activation was followed by the formation of a stable chelating structure between single-bond S1 and double-bond S2 atoms of BX, resulting in electron loss. This system also facilitated dixanthate formation on the mineral surface via interaction between BX and oxygen, thus improving the floatability of stibnite. This study lays a theoretical foundation for the efficient recovery of stibnite.

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Section: Computational Detailsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Activation mechanisms of Cu 2+ and Pb 2+ in stibnite flotation

Xiao

Cui

Tong

et al. 2023

Preprint

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“…UAVs are also used for oblique photogrammetry, which involves obtaining 3D information of the target object by planning multiple routes to obtain oblique photographs at a 45° pitch angle from four directions or acquiring images from five directions-front, back, left, right, and down-through a single route in a five-shot manner [32][33][34]. It has enjoyed increasing popularity in recent years for applications in survey and mapping, specifically in the 3D modeling of buildings (structures), acquisition of DSM/DEM of open-pit mining slopes, 3D mapping of steep coastal cliffs, establishment of large-scale slope surface models, and identification of emergent strata [35][36][37][38]. However, oblique photogrammetry is disadvantageous because its flight altitude is suitable for a high-elevation surface, and the accuracy of the acquired data is limited by distance.…”

Section: Introductionmentioning

confidence: 99%

Investigation of rock mass deformation through nap-of-the-object photogrammetry: a case study of Hongyun Golden Peak in Fanjing Mountain, China

Dang,

Fan,

Wang

et al. 2023

Preprint

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Traditional field investigation methods are inapplicable in some landslide cases where numerous dangerous rocks are distributed. Therefore, nap-of-the-object photogrammetry (NOOP) has been developed for such applications while meeting the demand for fine measurements. The new technology involves using UAVs to fly close to the object surface to obtain subcentimeter high-resolution images. Afterward, software is used to achieve a fine surface model of the target object. In this paper, a case study of the deformation characteristics of the high-steep rock mass of Hongyun Golden Peak of Fanjing Mountain in Guizhou Province, China, is conducted. Through preliminary oblique photogrammetry, which involves data processing, NOOP route planning, and fine NOOP, a realistic 3D surface model of the Golden Peak of Fanjing Mountain is obtained. The resolution of the model could reach the millimeter level (2 mm). Detailed characteristics of the 3 groups of joints and 9 deep-large cracks are obtained from the rock structure investigation and statistical analysis of fissure deformation. NOOP can be used to acquire the elevation of the target object, thus compensating for the deficiencies of oblique photogrammetry. Additionally, it accurately reproduces the terrain and fine object structures. The results of this study can provide a reference for geological investigations involving monitoring high-steepness dangerous rocks.

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Identification of outcropping strata from UAV oblique photogrammetric data using a spatial case-based reasoning model

Cited by 2 publications

References 65 publications

Activation mechanisms of Cu 2+ and Pb 2+ in stibnite flotation

Activation mechanisms of Cu 2+ and Pb 2+ in stibnite flotation

Investigation of rock mass deformation through nap-of-the-object photogrammetry: a case study of Hongyun Golden Peak in Fanjing Mountain, China

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