共查询到20条相似文献,搜索用时 15 毫秒
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Yin Hui 《地球空间信息科学学报》2013,16(3):69-72
The methods of deformation analysis and modeling at single point are realized easily now, but available approaches do not make full use of the information from monitoring points and can not reveal integrated deformation regularity of a deformable body. This paper presents a fuzzy clusetering method to analyze the correlative relations of multiple points in space, and then the spatial model for a practical dangerous rockmass in the area of Three Gorges, Yangtze River is established, in which the correlation of six points in space is analyzed by geological investigation and fuzzy set theory. 相似文献
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边坡变形受地质、水文、气候、突发因素(如暴雨、地震)、人工活动(如开挖或防护)等各种因素的影响,这些因素与变形之间一般不是确定的定量关系。本文介绍了不同影响因素与位移量的模糊关系及位移量的模糊近似推论,在此基础上应用模糊人工神经网络进行位移量预报,并以一个边坡监测资料为例说明了具体的应用方法。 相似文献
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模糊神经网络在变形分析与预报中的应用研究 总被引:1,自引:0,他引:1
研究了模糊神经网络的网络建模,提出了单点建模、分组建模和整体建模3种建模方法,为变形分析和预报提供了新思路。结合滑坡变形实例,指出了模糊神经网在工程变形分析和预报中的可行性。 相似文献
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拟稳平差在测量数据处理中的应用 总被引:1,自引:0,他引:1
拟稳平差是一种顾及基准点稳定性的平差方法,在变形监测领域有着广泛的应用。介绍了拟稳平差的基本原理,说明了拟稳平差在沉降观测中的应用;拟稳平差的关键是选取符合实际的“拟稳点”,讨论了拟口点选择的两种方法:假设检验法和模糊聚类法,并给出算例进行说明。 相似文献
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直接线性变换(D irect LinearTransformation)解法是建立观测点像方空间坐标和同名点物方空间坐标之间直接线性关系的算法。本次试验通过使用普通数码相机,并应用2维直接线性变换进行了建筑物变形监测的试验研究,试验结果表明,使用普通数码相机代替常规测量方法能够满足变形监测三等精度要求。 相似文献
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基于56景COSMO-SkyMed影像,本文采用PSP-InSAR技术对杭州地铁2号线沿线500 m范围进行地面沉降监测,并对形变区的位置、面积和数量进行了统计,在此基础上提取形变梯度大于0.1 mm/m的累计形变量点并开展比对分析。结果表明:①虽然地表形变集中区、形变严重区和形变梯度较大区域有着高度的重叠,但部分形变集中区内形变量和形变梯度并不大,也存在形变平稳区段形变梯度却较为显著现象,因此单从一个角度分析地铁沿线的形变,易增加漏检和错检的概率。②PSP-InSAR技术可从空间上完整表现地铁线上沉降的分布特征,对于地铁竣工运营期间的沉降监测具有显著意义,可为地铁的运营维护提供依据。 相似文献
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Automatic Surface Reconstruction Based on the Fusion of Fuzzy Logic and Robust Estimation Techniques
Farhad Samadzadegan Ali Azizi Caro Lucas & Michael Hahn 《The Photogrammetric Record》2002,17(100):651-674
Automatic surface reconstruction by means of digital image matching essentially involves computation in both image and object spaces. In image space, image matching is performed according to certain radiometric and geometric similarity criteria for conjugate point determination. The matching operations may therefore be regarded as decision–making processes. In practice, however, the similarity criteria for conjugate point determination demonstrate non–deterministic behaviour. Thus, the nature of these decision–making processes is more compatible with fuzzy reasoning concepts. In object space, on the other hand, surface reconstruction procedures, which operate on the basis of previously determined conjugate points, are essentially deterministic in nature and hence demand rigorous geometric modelling. In this paper, a new approach for automatic surface modelling is proposed, based on two different mathematical treatments: a fuzzy logic reasoning method for the conjugate point determination in image space; and a robust finite elements approach for the surface modelling in object space. Tests carried out on real data demonstrate the high potential of the strategy proposed. 相似文献
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运用混沌理论研究基坑变形破坏的演变机理,对基坑变形观测数据序列进行相空间重构,将若干固定时间延迟点上的测量作为新维处理,形成相点,按照关联维数方法求算吸引子维数,提取和恢复基坑系统原有的规律。实例分析表明,混沌理论为基坑预测研究提供了新的途径。 相似文献
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多波束声纳和侧扫声纳数字信息的配准及融合 总被引:4,自引:0,他引:4
提出了基于等深线和轮廓线的同名特征点配准法,它组合测深数据和回波强度图像信息,从等深线和轮廓线段中提取特征点,对同名特征点使用二次多项式拟合方法确定变形模型,实现不同数据源的配准。使用小波进行融合处理,采用交叉熵对结果进行评价。用模拟数据进行了验证,取得了理想的效果。 相似文献
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A Parameterized Representation of Uncertain Conceptual Spaces 总被引:3,自引:0,他引:3
Ola Ahlqvist 《Transactions in GIS》2004,8(4):493-514
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Md Soyeb Alam Dheeraj Kumar R. S. Chatterjee Vijay Upreti 《Journal of the Indian Society of Remote Sensing》2018,46(10):1569-1580
Differential interferometric synthetic aperture radar (DInSAR) is a novel remote sensing technique to measure earth surface deformation. It is capable of obtaining dense information related to the deformation of a large area efficiently, economically and effectively. Therefore, DInSAR is a promising technology for monitoring the earth surface deformation related to some natural hazardous events, such as earthquake, volcano eruption, land subsidence, landslide. In present study, Conventional DInSAR technique have been applied to a mineral rich zone, coming under the Khetri copper belt, a part of Northern Aravali range of hillocks in India, predominant with mining activities since late 1960’s to address the possibility of deformation phenomena due to hard rock underground metal mining. Four interferometric SAR data sets of Radarsat-2 was used for the study area to address the subsidence/uplift phenomena. Further, results obtained from conventional DInSAR technique using Radarsat-2 data sets compared with results obtained from ground based observation technique for its validity. In both the techniques, deformation results obtained in terms of average subsidence rate in mm (quarterly basis) of points under study within mining zone of Mine-A has well agreed to each other. Further, it has been observed that average subsidence rate in mm (quarterly basis) obtained from space based observation and ground based observation are 5.6 and 6.67, respectively over the points under study in mining zone of Mine-A. 相似文献