用应变分析技术对尼日利亚拉各斯州一些选定的大地测量控制的稳定性进行了调查

IF 0.3 Q4 REMOTE SENSING South African Journal of Geomatics Pub Date : 2023-08-07 DOI:10.4314/sajg.v12i.2.4
O.G. Omogunloye, S. Bawa, O. E. Abiodun, O. A. Olunlade, T. J. Salami, A. O. Alabi
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引用次数: 0

摘要

自然灾害给全球带来挑战,可能造成社会、经济和环境破坏,造成大量生命损失,甚至对地缘政治稳定构成威胁。通过形变建模和分析来研究这类灾害已经在大地测量学和地球动力学学科中得到了应用。事实上,应变法已被用于模拟变形。利用全球定位系统(空间技术)观测到的经典横移坐标的基线比,在Minna基准平台上计算了该有限元模型的应变变形参数,即剪胀率、总剪切应变和微分旋转。在排除网络中的病态三角形后,在MATLAB程序和MONTE CARLO环境中进行计算。在95%、97.5%和99.5%的置信区间上,采用统计分析确定各自变形参数的显著性水平。在对变形参数进行统计测试后,可以观察到一些控制在其计算的剪胀率和总剪切应变值方面是不稳定的。对于网络的微分旋转,95%、97.5%和99.5%置信区间的显著性水平分别为1.8743908、0.9651796和0.4338522,而另一方面,不响应网络旋转的对照或质心的平均值约为-0.99999。在质心11和质心36对应的三角站特征处,最小主应变水平分别为(36-12、30-84、43-34A)和(34-30A、34-32A、34-36A)。本研究采用的方法对变形研究和分析是非常有效的。
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An Investigation into the Stability of some selected Geodetic Controls in Lagos State of Nigeria using the Strain Analysis Technique
Natural disasters pose global challenges and can result in social, economic, and environmental damage, substantial loss of life, and even pose a threat to geopolitical stability. The study of such disasters through deformation modeling and analyses has found application in the disciplines of Geodesy and Geodynamics. The strain method has in fact been used to model deformation. The strain deformation parameters, namely, dilatancy, total shear strain and differential rotation, of this finite elemental model were calculated by using the baseline ratios of the coordinates of a classical traverse observed using the Global Positioning System (space technique), in the Minna datum platform. Computation was undertaken in a MATLAB programme and a MONTE CARLO environment, after the ill-conditioned triangles in the network were excluded. Statistical analysis was used to determine the significance levels of the respective deformation parameters at the 95%, 97.5% and 99.5% confidence intervals. After the statistical testing of the deformation parameters, it was observed that some of the controls were unstable in terms of their computed dilatancy and their total shear strain values. For the differential rotation of the network, the significance levels at the 95%, 97.5% and 99.5% confidence intervals were found to be 1.8743908, 0.9651796 and 0.4338522, respectively, while, on the other hand, the controls or centroids that did not respond to the network rotation had a mean value of approximately -0.99999.The minimal and maximal principal strain levels occurring at Centroids 11 and 36 with their triangulated station identities were found to be (36-12, 30-84, 43-34A) and (34-30A, 34-32A, 34-36A), respectively. The method adopted for this research proved to be very effective for a deformation study and analysis.
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