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2024 Symposium on Spatial Information to Empower the Metaverse

作者： Zhao, Jianghong Liu, Ziyu Liu, Ziling Xu, Ailin Zhao, Jifu School of Surveying Mapping and Urban Spatial Information Beijing University of Civil Engineering and Architecture Beijing102616 China

China has the longest and widest distribution of blind corridors in the world, but in many cities they are virtually non-existent, with all kinds of obstacles affecting the movement of the blind. Thus, guaranteeing safe traveling for the blind has become an increasingly important topic. Some existing assistive traveling devices for the blind have problems such as poor portability and low-cost performance. With the rise of the mobility era and the rapid development of deep learning technology, the target detection of blind obstacles on cell phones has become feasible. In this paper, we take the target detection model YOLOv8n as the base network, redesign the neck of the network, use GS convolution as the basis, adopt one-time aggregation and cross-channel branching to build a lightweight module, and use the CARAFE operator as the up-sampling method, and stack the lightweight module with CARAFE operator to build a new feature fusion layer, forming a lightweight feature-aware enhanced target detection network. The results show that the accuracy still reaches 99.5% of the original network under the premise that the model size is reduced by 1.2%, and the improved network achieves a balance between accuracy and lightweight. © Author(s) 2024.

关键词： Obstacle detectors

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Intelligent extraction of road cracks based on vehicle laser point cloud and panoramic sequence images

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Journal of Road engineering 2024年第1期4卷 69-79页

作者： Ming Guo Li Zhu Ming Huang Jie Ji Xian Ren Yaxuan Wei Chutian Gao School of Geomatics and Urban Spatial Informatics Beijing University of Civil Engineering and ArchitectureBeijing 102616China Engineering Research Centre of Representative Building and Architectural Heritage Database Ministry of EducationBeijing 100044China Key Laboratory of Modern Urban Surveying and Mapping National Administration of SurveyingBeijing 102616China School of Civil and Transportation Engineering Beijing University of Civil Engineering and ArchitectureBeijing 102616China

In light of the limited efficacy of conventional methods for identifying pavement cracks and the absence of comprehensive depth and location data in two-dimensional photographs,this study presents an intelligent strategy for extracting road *** methodology involves the integration of laser point cloud data obtained from a vehicle-mounted system and a panoramic sequence of *** study employs a vehicle-mounted LiDAR measurement system to acquire laser point cloud and panoramic sequence image data simultaneously.A convolutional neural network is utilized to extract cracks from the panoramic sequence *** extracted sequence image is then aligned with the laser point cloud,enabling the assignment of RGB information to the vehicle-mounted three dimensional(3D)point cloud and location information to the two dimensional(2D)panoramic ***,a threshold value is set based on the crack elevation change to extract the aligned roadway point *** three-dimensional data pertaining to the cracks can be *** experimental findings demonstrate that the use of convolutional neural networks has yielded noteworthy outcomes in the extraction of road *** utilization of point cloud and image alignment techniques enables the extraction of precise location data pertaining to road *** approach exhibits superior accuracy when compared to conventional ***,it facilitates rapid and accurate identification and localization of road cracks,thereby playing a crucial role in ensuring road maintenance and traffic ***,this technique finds extensive application in the domains of intelligent transportation and urbanization *** technology exhibits significant promise for use in the domains of intelligent transportation and city development.

关键词： Road crack extraction Vehicle laser point cloud Panoramic sequence images Convolutional neural network

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Research on virtual collaborative emergency response to road emergencies based on Multi-Agent 4

Research on virtual collaborative emergency response to road...

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2024 4th International Conference on Intelligent Traffic Systems and Smart City, ITSSC 2024

作者： Ma, Shuaibao Zhang, Jianqin Shen, Bo Gao, Xiangsen Zou, Ruimeng School of Surveying and Urban Spatial Information Beijing University of Civil Engineering and Architecture Beijing102616 China Beijing Institute of Surveying and Mapping Beijing100038 China

ISBN: (纸本)9781510686304

Emergencies are characterized by suddenness, complexity, and high uncertainty. Drills to respond to emergencies mostly use actual combat methods, which consume a lot of manpower and material resources. The frequency is low, and emergency personnel are not familiar with the collaborative handling of emergencies. It's hard to improve. This paper proposes a virtual collaborative emergency response method for road emergencies in flood season based on Multi-Agent. The transportation committee, highway branch, and maintenance group of the relevant units of road emergency response are used as participants in emergency response. Combined with the characteristics of road emergencies in flood season, Intelligent agents such as scene agent, monitoring agent, rescue agent, and disaster-affected Agent agents are established in the virtual scene to represent the transportation committee and other departments for collaborative emergency response, providing a more comprehensive, realistic and efficient virtual collaborative drill method for emergency response, thereby improving the emergency response department emergency response capabilities and collaborative emergency response capabilities. © 2025 SPIE.

关键词： Disasters

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Prediction of concrete sulfuric acid corrosion evaluation index model based on grey system theory 69

Prediction of concrete sulfuric acid corrosion evaluation in...

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69th International Conference on Vibroengineering

作者： Lin, Mingqiang Zeng, Qinglong Dai, Fengjuan Zhang, Ran School of Civil Engineering and Architecture University of Jinan Jinan China School of Civil Engineering Shandong Jiaotong University Jinan China Jinan Real Estate Surveying and Mapping Research Institute Jinan China

In order to predict the impact of sulfate corrosion on concrete, based on grey system theory, GM(1,1) and GM(1, N) models were used to predict and analyze the compressive strength and relative dynamic elastic modulus of concrete under sulfuric acid corrosion. The results show that the prediction error of the GM(1,1) model for concrete sulfate corrosion attenuation is within 5 %, and the residual size test of the GM(1, N) model for concrete sulfate corrosion is within 10 %. © 2024 Mingqiang Lin, et al.

关键词： System theory

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Accuracy Analysis of Oblique Photogrammetry Technology in Earthwork Survey of Complex Terrain 2

Accuracy Analysis of Oblique Photogrammetry Technology in Ea...

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2023 2nd International Conference on Environmental Remote Sensing and Geographic Information Technology, ERSGIT 2023

作者： Wang, Chenyang Zhang, Xu Song, Chunlong Yu, Huijuan Bai, Jin Tian, Dongwei Surveying and Mapping Development Research Center MNR Beijing China Shandong Zhengyuan Digital City Construction Co. Ltd. Yantai China School of Engineering Sciences University of Chinese Academy of Sciences Beijing China School of Architecture Beijing University of Architecture Beijing China

ISBN: (纸本)9781510672949

Traditional full-field surveying methods have problems such as large acquisition difficulty and low efficiency in earthwork surveying and mapping of complex terrain. This paper takes the solution of the earthwork of complex terrain as the starting point, applies the drone oblique photography technology to the calculation of the earthwork volume, and forms a real 3D model through the processes of multi-angle texture data collection, aerial triangulation, dense matching, and triangulation construction. Take the real 3D model as the basic data, and manually intervene to extract the elevation points semi-automatically as the important raw data for earthwork calculation. The square grid method is used as the earthwork volume calculation method, and compared with the traditional surveying and mapping method, the experiment shows that the oblique photogrammetry technology can meet the relevant accuracy requirements of earthwork survey, and has the advantages of high accuracy and fast efficiency. © 2024 SPIE.

关键词： Triangulation

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Multi-level semantic constraints for dam safety monitoring scenario construction 4

Multi-level semantic constraints for dam safety monitoring s...

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4th International Conference on Geoscience and Remote Sensing mapping, GRSM 2022

作者： Geng, Mingzhu Huo, Liang Shen, Tao Yang, Kelong Li, Miaolin School of Surveying and Mapping Engineering Beijing University of Civil Engineering and Architecture Beijing100044 China Key Laboratory of Urban Spatial Information Ministry of Natural Resources Beijing100044 China

ISBN: (数字)9781510662179

ISBN: (纸本)9781510662162

Aiming at the problems of complex scene objects, lack of correlation between them, close coupling between modelling knowledge and modelling process, and low flexibility of scene configuration in dam safety monitoring scene construction, this paper proposes a multi-level semantic constraint method for dam safety monitoring scene construction. First, based on the analysis of the characteristics of dam safety monitoring scene modelling operations and modelling knowledge expression, modelling knowledge is extracted from spatial pose semantic constraints, spatial layout semantic constraints and component combination semantic constraints, and modelling knowledge and modelling operations are stored in a parametric way. Then, after the multi-level semantic constraint rules constrain and guide the way the scenario objects are combined, the dam safety monitoring scenario is generated. A prototype dam safety monitoring system is developed based on this approach to validate the effectiveness of the method. © 2023 SPIE.

关键词： Semantics

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How to determine city hierarchies and spatial structure of a megaregion?

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地球空间信息科学学报（英文版） 2024年第2期27卷 276-288页

作者： Yanyan Gu Run Shi Yan Zhuang Qingquan Li Yang Yue Shenzhen Key Laboratory of Spatial Smart Sensing and Services Shenzhen UniversityShenzhenChina Department of Urban Informatics School of Architecture and Urban PlanningShenzhen UniversityShenzhenChina Department of Urban Planning and Design The University of Hong KongHong Kong SARChina State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhanChina

Megaregion has emerged as a global urban form,typically based on the polycentric strategy to enhance regional *** to measure megaregional spatial structure and discrimi-nate different roles of cities has become increasingly important to enrich the knowledge of the formation of a ***,various indices have been used to identify vital nodes in the field of complex *** indices,however,are suitable for megaregion analysis remain *** address this requirement,this study first reviewed the typical indices for identifying vital nodes in the complex network theory,and pointed out that in a weighted city network scenario,weighted degree centrality,hub&authority score,and S-core decomposi-tion(which represent network centrality,connectivity,and structures,respectively)are suitable for analyzing megaregional spatial ***,we explored the city hierarchies and spatial structure in Guangdong Province,China,using the three *** hierarchical structure of the weighted city network in Guangdong Province had been identified using S-core *** the perspective of polycentric structure,Guangzhou and Shenzhen have the strongest node degrees and strength of mobility flows,while the Guangzhou-Dongguan-Shenzhen corridor has been identified via the hub&authority score which is designed to evaluate the connectivity in a weighted ***,we con-ducted a comparison analysis of three *** findings of this study not only enrich the understanding of city hierarchies and the structure of a megaregion,but also highlight that although various indices are available,they should be applied selectively in accordance with the study context.

关键词： Megaregion city hierarchies spatial structure complex network

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A new receiver clock model to enhance BDS-3 real-time PPP time transfer with the PPP-B2b service

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Satellite Navigation 2023年第1期4卷 1-12,I0002页

作者： Yulong Ge Qing Wang Yong Wang Daqian Lyu Xinyun Cao Fei Shen Xiaolin Meng School of Marine Science and Engineering Nanjing Normal UniversityNanjing 210023China School of Instrument Science and Engineering Southeast UniversityNanjing 211189China Jiangsu Province Institute of Surveying and Mapping Engineering Nanjing 210013China College of Electronic Engineering National University of Defense TechnologyHefei 230037China School of Geography Nanjing Normal UniversityNanjing 210023China Faculty of Architecture Civiland Transportation EngineeringBeijing University of TechnologyBeijing 100124China State Key Laboratory of Geodesy and Earth’s Dynamics Innovation Academy for Precision Measurement Science and TechnologyCASWuhan 430077China GNSS Research Center Wuhan UniversityWuhan 430079China

A new Precise Point Positioning(PPP)service,called the PPP-B2b service,has been implemented in the BeiDou-3 Navigation Satellite System(BDS-3),which brings new opportunities for time ***,the solution using the traditional PPP method with the PPP-B2b correction still absorbs some unknown errors and needs reconverging when there exist abnormal *** developed a new receiver clock model to improve PPP time transfer using the PPP-B2b *** traditional PPP time transfers using PPP-B2b with BDS-3,Global Positioning System(GPS),and BDS-3/GPS(Scheme1)are compared with the corresponding time transfer with the proposed clock model(Scheme2).The results show that GPS-only PPP is not recommended because of low accuracy of 2 ***-3 or BDS-3/GPS PPP time transfers in Scheme1 can realize about 0.2 ns *** the new clock model is applied,the accuracy can be improved by up to 45%and 39.8%for BDS-3 and BDS-3/GPS PPP,*** proposed clock model can signifcantly improve the short-term frequency stability by 57.4%,but less for the long-term stability.

关键词： PPP-B2b BDS-3 Time transfer Receiver clock model

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Learning the spatial co-occurrence for browsing interests extraction of domain users on public map service platforms

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地球空间信息科学学报（英文版） 2024年第2期27卷 455-474页

作者： Guangsheng Dong Rui Li Huayi Wu Wei Huang Hongping Zhang Vincent Tao Quan Liu State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhanChina Hubei Luojia Laboratory WuhanChina Collaborative Innovation Center of Geospatial Technology Wuhan UniversityWuhanChina National Geomatics Center of China BeijingChina National Geomatics Center of China BeijingChina School of Geomatics and Urban Spatial Information Beijing University of Civil Engineering and ArchitectureBeijingChina Shanghai Weizhizhuoxin Information Technology Co.Ltd ShanghaiChina

Public Map Service Platforms(PMSPs)provide embedded map services in domains such as forests and *** from different domains(Domain Users)prefer specific spatial features,and extracting the Browsing Interests of Domain Users(BIDUs)can help elucidate users'access intentions and provide suitable *** research has found that access frequency of spatial features is an indicator of users'browsing interests;however,high-frequency spatial features are sparsely distributed,resulting in inaccurate extraction of brows-ing *** objective is to model the spatial co-occurrence of spatial features and employ BIDUs extraction to address this ***,to extract spatial features in tiles,we proposed a k-nearest neighbor method for Point-of-Interest(POI)extraction and a template-based method for Land Uses/Land Covers ***,we developed the word2vec model to construct a POI semantic space to quantify spatial co-occurrence and employed multi-domain user classification to verify its ***,a combined word2vec and singular value decomposition model is proposed to perform topic extraction as a representation of *** with the baseline models,the proposed model integrates spatial co-occurrence from massive POIs to achieve high-accuracy BIDU *** findings can help construct domain user profiles and support the development of intelligent PMSPs.

关键词： Browsing interest extraction spatial co-occurrence Point-of-Interest(POI)semantic space word2vec Public Map Service Platform(PMSP)

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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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