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Urban Geospatial Information Acquisition Mobile Mapping System based on close-range photogrammetry and IGS site calibration

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Geo-Spatial Information Science 2021年第4期24卷 558-579页

作者： Ming Guo Yuquan Zhou Jianghong Zhao Tengfei Zhou Bingnan Yan Xianfeng Huang State Key Laboratory of Geo-Information Engineering Xi‘An Institute of Surveying and MappingXi’anChina School of Geomatics and Urban Spatial Informatics Beijing University of Civil Engineering and ArchitectureBeijingChina Ministry of Education Engineering Research Centre of Representative Building and Architectural Heritage DatabaseBeijingChina Key Laboratory of Modern Urban Surveying and Mapping National Administration of Surveying Mapping and GeoinformationBeijingChina Beijing Key Laboratory for Architectural Heritage Fine Reconstruction&Health Monitoring Beijing University of Civil Engineering and ArchitectureBeijingChina State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhanChina

The measurement accuracy of the Mobile Mapping System (MMS) is the main problem, which restricts its development and application, so how to calibrate the MMS to improve its measure-ment accuracy has always been a research hotspot in the industry. This paper proposes a position and attitude calibration method with error correction based on the combination of the feature point and feature surface. First, the initial value of the spatial position relation-ship between each sensor of MMS is obtained by close-range photogrammetry. Second, the optimal solution for error correction is calculated by feature points in global coordinates jointly measured with International GNSS Service (IGS) stations. Then, the final transformation para-meters are solved by combining the initial values obtained originally, thereby realizing the rapid calibration of the MMS. Finally, it analyzed the RMSE of MMS point cloud after calibration, and the results demonstrate the feasibility of the calibration approach proposed by this method. Under the condition of a single measurement sensor accuracy is low, the plane and elevation absolute accuracy of the point cloud after calibration can reach 0.043 m and 0.072 m, respectively, and the relative accuracy is smaller than 0.02 m. It meets the precision require-ments of data acquisition for MMS. It is of great significance for promoting the development of MMS technology and the application of some novel techniques in the future, such as auton-omous driving, digital twin city, urban brain et al.

关键词： Mobile Mapping System(MMS) close-range photogrammetry International GNSS Service(IGS) MMS calibration accuracy evaluation

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Operating Mode And Method On Information Collection Systems Of GPS close-range photogrammetry

Operating Mode And Method On Information Collection Systems ...

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第三届中国卫星导航学术年会

作者： WANG Da1,2,BEI Jin-zhong1,GU Shou-zhou1,NIE Ren-qi1 (1 Chinese Academy of Surveying and Mapping,Beijing 100039 2 School of Geomatics,Liaoning Technical University,Fuxin,Liaoning,123000)

Information collection system of GPS close-range photogrammetry is a measurement system that integrate high-precision satellite positioning technology,photogrammetry and digital compass angle measurement technique to collect the information of non-contact ***,in practice,the intersection angle of the image,the distance between feature points and collection point of the image and the geometric relation of collection points and feature points,these will directly affect the calculation accuracy of feature *** on different measured data,This paper respectively analyzed the four factors that affecting the calculation accuracy of feature points,and then obtained a batter operation mode of the system and a data processing method as well.

关键词： Digital Compass High-precision Satellite Positioning Digital Cameras close-range photogrammetry

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Optimization of the forearm angle for arm wrestling using multi-camera stereo digital image correlation: A preliminary study

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Theoretical & Applied Mechanics Letters 2021年第6期11卷 336-342页

作者： Zixiang Tong Xinxing Shao Zhenning Chen Xiaoyuan He Department of Engineering Mechanics School of Civil EngineeringSoutheast UniversityNanjing 211189China College of Aerospace Engineering Nanjing University of Aeronautics&AstronauticsNanjing 210016China

This study analyzes the function of different muscles during arm wrestling and proposes a method to analyze the optimal forearm angle for professional arm *** built a professional arm-wrestling platform to measure the shape and deformation of the skin at the biceps brachii of a volunteer in vivo during arm *** observed the banding phenomenon of arm skin strain during muscle contraction and developed a model to evaluate the moment provided by the biceps *** to this model,the strain field of the area of interest on the skin was measured,and the forearm angles most favorable and unfavorable to the work of the biceps brachii were *** study demonstrates the considerable potential of applying DIC and its extension method to the in vivo measurement of human skin and facilitates the use of the in vivo measurement of skin deformation in various sports in the future.

关键词： Arm wrestling Skin deformation measurement Multi-camera stereo digital image correlation close-range photogrammetry Forearm angle

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Study on Safety of Bridge Foundation on Canyon Bank Slope

Study on Safety of Bridge Foundation on Canyon Bank Slope

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2002年安全与科学技术国际会议

作者： ZHAO Wen & XIE Qiang (School of Civil Engineering Southwest Jiaotong University Chengdu 610031 Sichuan China)

＜正＞ This paper, taking the bank slopes of Beipanjiang River Bridge as an example, deals with the natural stability of the bank slopes in terms of engineering geology investigation and indoor analysis. The safety of the bank slope under load is studied by model test and numerical simulation. The settlements of the bridge foundations during construction are monitored in field with close-range photogrammetry. The study results show that the foundation of Beipanjiang River bridge is safe.

关键词： bridge foundation bank slope safety model test close-range photogrammetry

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