Three-dimensional (3D) parametric measurements of individual gravels in the Gobi region using point cloud technique

IF 2.7 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Journal of Arid Land Pub Date : 2024-05-18 DOI:10.1007/s40333-024-0073-4
Xiangyu Jing, Weiyi Huang, Jiangming Kan
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Abstract

Gobi spans a large area of China, surpassing the combined expanse of mobile dunes and semi-fixed dunes. Its presence significantly influences the movement of sand and dust. However, the complex origins and diverse materials constituting the Gobi result in notable differences in saltation processes across various Gobi surfaces. It is challenging to describe these processes according to a uniform morphology. Therefore, it becomes imperative to articulate surface characteristics through parameters such as the three-dimensional (3D) size and shape of gravel. Collecting morphology information for Gobi gravels is essential for studying its genesis and sand saltation. To enhance the efficiency and information yield of gravel parameter measurements, this study conducted field experiments in the Gobi region across Dunhuang City, Guazhou County, and Yumen City (administrated by Jiuquan City), Gansu Province, China in March 2023. A research framework and methodology for measuring 3D parameters of gravel using point cloud were developed, alongside improved calculation formulas for 3D parameters including gravel grain size, volume, flatness, roundness, sphericity, and equivalent grain size. Leveraging multi-view geometry technology for 3D reconstruction allowed for establishing an optimal data acquisition scheme characterized by high point cloud reconstruction efficiency and clear quality. Additionally, the proposed methodology incorporated point cloud clustering, segmentation, and filtering techniques to isolate individual gravel point clouds. Advanced point cloud algorithms, including the Oriented Bounding Box (OBB), point cloud slicing method, and point cloud triangulation, were then deployed to calculate the 3D parameters of individual gravels. These systematic processes allow precise and detailed characterization of individual gravels. For gravel grain size and volume, the correlation coefficients between point cloud and manual measurements all exceeded 0.9000, confirming the feasibility of the proposed methodology for measuring 3D parameters of individual gravels. The proposed workflow yields accurate calculations of relevant parameters for Gobi gravels, providing essential data support for subsequent studies on Gobi environments.

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利用点云技术对戈壁地区的单个砾石进行三维(3D)参数测量
戈壁横跨中国大片地区,其面积超过了流动沙丘和半固定沙丘的总和。戈壁的存在极大地影响了沙尘的流动。然而,由于戈壁的成因复杂,构成戈壁的物质多种多样,因此不同戈壁表面的盐化过程存在明显差异。根据统一的形态描述这些过程具有挑战性。因此,通过砾石的三维(3D)尺寸和形状等参数来阐明表面特征就变得十分必要。收集戈壁砾石的形态信息对于研究其成因和沙盐化至关重要。为了提高砾石参数测量的效率和信息量,本研究于 2023 年 3 月在中国甘肃省敦煌市、瓜州县和玉门市(酒泉市辖县)的戈壁地区进行了野外试验。该项目开发了利用点云测量砾石三维参数的研究框架和方法,并改进了砾石粒度、体积、平整度、圆度、球度和等效粒度等三维参数的计算公式。利用多视角几何技术进行三维重建可以建立一个最佳的数据采集方案,其特点是点云重建效率高、质量清晰。此外,所提出的方法结合了点云聚类、分割和过滤技术,以分离出单独的砾石点云。然后采用先进的点云算法,包括定向包围盒(OBB)、点云切片法和点云三角测量法,来计算单个砾石的三维参数。通过这些系统化的过程,可以对单个砾石进行精确而详细的特征描述。在砾石粒度和体积方面,点云测量与人工测量之间的相关系数均超过 0.9000,证实了所提出的测量单个砾石三维参数方法的可行性。所提出的工作流程可以精确计算戈壁砾石的相关参数,为后续的戈壁环境研究提供重要的数据支持。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Arid Land
Journal of Arid Land ENVIRONMENTAL SCIENCES-
CiteScore
4.70
自引率
6.70%
发文量
768
审稿时长
3.2 months
期刊介绍: The Journal of Arid Land is an international peer-reviewed journal co-sponsored by Xinjiang Institute of Ecology and Geography, the Chinese Academy of Sciences and Science Press. It aims to meet the needs of researchers, students and practitioners in sustainable development and eco-environmental management, focusing on the arid and semi-arid lands in Central Asia and the world at large. The Journal covers such topics as the dynamics of natural resources (including water, soil and land, organism and climate), the security and sustainable development of natural resources, and the environment and the ecology in arid and semi-arid lands, especially in Central Asia. Coverage also includes interactions between the atmosphere, hydrosphere, biosphere, and lithosphere, and the relationship between these natural processes and human activities. Also discussed are patterns of geography, ecology and environment; ecological improvement and environmental protection; and regional responses and feedback mechanisms to global change. The Journal of Arid Land also presents reviews, brief communications, trends and book reviews of work on these topics.
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