Integrated time-space modelling based on correlated measurements for the determination of survey configurations and the description of deformation processes

基于相关测量的综合时空建模，用于确定测量配置和描述变形过程

• 批准号: 244863323
• 负责人: Professor Dr.-Ing. Volker Schwieger
• 金额: --
• 依托单位: Institut für Ingenieurgeodäsie (IIGS)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/244863323?language=en
• 关键词: Integrated; time; space; modelling; based

This project addresses the analysis of deformation processes with high spatial resolution. The two main objectives are the development of a space-continuous congruency deformation model in order to represent these processes and the implementation of a non-linear sensitivity analysis of this model. The investigations continue the research topics of IMKAD I, but address new topics as well. Two point clouds, representing the geometry of the same object at two discrete points of time and differing in a pure rigid body motion or in a rigid body movement superimposed by local strain, form the project’s basis. The establishment of the deformation model is twofold as it requires a functional as well as a stochastic part. The development of the latter includes the determination of the synthetic covariance matrix of impulse scanners and the continuation of the respective investigations of IMKAD I concerning phase-based scanners, taking new and more realistic findings into account. An available complete reference laboratory showing laser-tracked geometries will be used to verify the results; among other things, a first-time verification of the variance level as well as of the matrix’s correlation structure will be possible. The methodological improvements regarding the deformation model’s functional part concern the qualification of estimated B-spline surfaces for an epochal comparison based on their surface parameters. A joint estimation of surface parameters and control points is necessary and yields to an adaption of the model selection method developed in IMKAD I. Based on these improvements, the grid of surface parameters is used to determine the elements of the rigid body movement. If the rigid body movement is superimposed by local strain, the respective influences have to be separated iteratively by identifying, statistically validating and excluding the distorted areas. The developed methods for point cloud modelling and for deformation analysis are assessed in two ways. On the one hand, they are validated by means of nominal values; on the other hand an evaluation is performed using algorithms which represent the state of the art. Therefore, measurements are performed at three objects with sizes at different scales: a test specimen, a freeform shell and a dam. Furthermore, atmospheric’s spatial and temporal variations can be particularly examined due to the field campaigns.The new deformation model, including rigid body movements as well as three-dimensional strain, leads to a revision of the non-linear sensitivity analysis, especially with respect to the approaches “observation groups” and “piecewise linearization”. Based on these approximations optimal scanner parameters are delivered by a prototype-software. The software will deliver the position of the scanner relative to the object, the scan quality level and the angular sampling rate in a heuristic and automated way.

本项目致力于高空间分辨率的变形过程分析。两个主要目标是开发一个空间连续的同余变形模型，以描述这些过程，并对该模型进行非线性敏感性分析。这些调查延续了第一届国际排雷行动的研究主题，但也涉及新的主题。两个点云，代表同一物体在两个离散时间点的几何形状，在纯刚体运动或局部应变叠加的刚体运动中不同，构成了该项目的基础。变形模型的建立是双重的，因为它既需要函数部分，也需要随机部分。后者的发展包括确定脉冲扫描仪的合成协方差矩阵，以及继续进行第一阶段的关于相位式扫描仪的调查，同时考虑到新的和更现实的调查结果。将使用显示激光跟踪几何形状的可用的完整参考实验室来验证结果；除其他事项外，将可能对方差水平以及矩阵的相关结构进行首次验证。关于变形模型功能部分的方法学改进涉及到基于其表面参数进行划时代比较的估计B-样条面的资格。曲面参数和控制点的联合估计是必要的，并且适用于IMKAD I中发展的模型选择方法。在这些改进的基础上，使用曲面参数网格来确定刚体运动的元素。如果刚体运动是由局部应变叠加的，则必须通过识别、统计验证和排除变形区域来迭代地分离各自的影响。已开发的点云建模和变形分析方法从两个方面进行了评估。一方面，通过标称值来验证它们；另一方面，使用代表最新技术状态的算法来执行评估。因此，对三个不同尺度的物体进行了测量：一个试件、一个自由壳体和一个大坝。新的变形模型，包括刚体运动和三维应变，导致了对非线性灵敏度分析的修正，特别是关于“观察组”和“分段线性化”的方法。在这些近似的基础上，通过原型软件提供了最佳扫描器参数。该软件将以启发式和自动化的方式提供扫描仪相对于对象的位置、扫描质量水平和角度采样率。

项目成果

A synthetic covariance matrix for monitoring by terrestrial laser scanning

• DOI: 10.1515/jag-2016-0026
• 发表时间: 2017-01-01
• 期刊: JOURNAL OF APPLIED GEODESY
• 影响因子: 1.4
• 作者: Kauker, Stephanie;Schwieger, Volker
• 通讯作者: Schwieger, Volker

A spatio-temporal deformation model for laser scanning point clouds

• DOI: 10.1007/s00190-020-01352-0
• 发表时间: 2020-02-11
• 期刊: JOURNAL OF GEODESY
• 影响因子: 4.4
• 作者: Harmening, Corinna;Neuner, Hans
• 通讯作者: Neuner, Hans

Two-epoch TLS deformation analysis of a double curved wooden structure using approximating B-spline surfaces and fully-populated synthetic covariance matrices

使用近似 B 样条曲面和完全填充的合成协方差矩阵对双曲木结构进行两历元 TLS 变形分析

• DOI: 10.4995/jisdm2022.2022.13816
• 发表时间: 2022
• 期刊: Proceedings of the 5th Joint International Symposium on Deformation Monitoring - JISDM 2022
• 作者: Kerekes G;Raschhofer;Harmening;Neuner;Schwieger V.
• 通讯作者: Schwieger V.

Choosing the Optimal Number of B-spline Control Points (Part 1: Methodology and Approximation of Curves)

• DOI: 10.1515/jag-2016-0003
• 发表时间: 2016-09-01
• 期刊: JOURNAL OF APPLIED GEODESY
• 影响因子: 1.4
• 作者: Harmening, Corinna;Neuner, Hans
• 通讯作者: Neuner, Hans

Elementary Error Model Applied to Terrestrial Laser Scanning Measurements: Study Case Arch Dam Kops

应用于地面激光扫描测量的基本误差模型：Arch Dam Kops 研究案例

• DOI: 10.3390/math8040593
• 发表时间: 2020
• 期刊: Mathematics
• 影响因子: 2.4
• 作者: Kerekes;Schwieger
• 通讯作者: Schwieger