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检索条件"任意字段=国际摄影测量与遥感学会三维城市建模与应用暨第六届三维地理信息国际研讨会"

共 32 条记录，以下是11-20 订阅

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CAD-Based 3D Semantic Modeling of Putrajaya

CAD-Based 3D Semantic Modeling of Putrajaya

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国际摄影测量与遥感学会三维城市建模与应用暨第六届三维地理信息国际研讨会

作者： Behnam Alizadehashrafi Alias Abdul-Rahman Dept.of Geoinformatics Faculty of Geoinformation & Real Estate Universiti Teknologi Malaysia81310 SkudaiJohorMalaysia

In this research project we are addressing low cost 3D city modeling techniques.2D existing highly detailed CAD data with lots of layers and rectified perpendicular symmetric photos of intricate constructions are used to generate the 3D models of Putrajaya in CityGML and *** 3D models are in LOD2.5 plus higher Level of Realism(LoR).Texture enhancement methods such as texture left-right or up-down symmetrical transformation and higher radiometric adjustment for raised surfaces and Dynamic Pulse Function are used in this research based on facet situation and our observation on the form of tessellation on the fa?ade *** problem of missing faces of polyhedrons or polygons and missing objects have been solved and described in this paper in CityGML and some Code-Lists defined for complex and intricate structures such as domes of the Putra Mosque or Court of Justice buildings in Putrajaya.

关键词： Texture enhancement,Symmetric transformation,dynamic pulse functions,semantic modeling,2D to 3D Modeling,CityGML,CityServer3D

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Towards a fast and easy approach for building textured 3D models using smartphones

Towards a fast and easy approach for building textured 3D mo...

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国际摄影测量与遥感学会三维城市建模与应用暨第六届三维地理信息国际研讨会

作者： Matthieu Bach Sylvie Daniel Department of geomatics Laval University Quebec City Canada

The vast majority of mobile AR applications currently available propose to"augment"the user world perception with annotations and 3D ***,the augmentation principle of these applications does not involve information about the user surroundings when rendering the digital *** a result,occlusions are not *** manage occlusions,it is advised to integrate information or knowledge about the *** a 3D model of the environment where the augmentation takes place offers opportunities for richer interactions and higher levels of ***,these 3D models of the environment are not always accessible,therefore limiting the capabilities to deploy realistic augmented reality solutions anywhere,*** previous work has been specifically dedicated to the design of solutions that help tackle this issue,namely a citizen based 3D modeling solution to enable mobile AR applications anywhere,*** proposed paper will describe the methods that have been designed and implemented to extend the capabilities of this first prototype,focusing on improving the 3D model realism and the precision of the subsequent augmentation of the real environment.

关键词： 3D modeling texture mapping augmented reality smartphone

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Improving the interoperability of 3D models among augmented reality systems:Proposal for a metamodel

Improving the interoperability of 3D models among augmented ...

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国际摄影测量与遥感学会三维城市建模与应用暨第六届三维地理信息国际研讨会

作者： Alborz Zamyadi Jacynthe Pouliot Yvan Bédard Geomatics Department Laval University Quebec City Canada

3D models are essential components of augmented reality(AR).However a literature review of AR applications shows important shortcomings about 3D model interoperability(property of information/data to be exchanged).Lack of proper data structure and management strategy could cause substantial data loss and disability of AR systems to share a common perception of the real ***,studies on AR applications and existing 3D models state that consistent integration of AR systems is not achievable unless the process of modeling is formulated regarding real world and associated representations with respect to AR ***,this research proposes meta-modeling as modus operandi to codify the required aspects of AR systems and the corresponding perception of world,and associate models with respect to each *** paper presents this new meta-model and exposes some examples of its manipulation to improve the ability of designing better inter-operable AR applications.

关键词： 3D model,augmented reality,interoperability,metamodel,semantics

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Semantic and topological representation of building indoors:an overview

Semantic and topological representation of building indoors:...

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国际摄影测量与遥感学会三维城市建模与应用暨第六届三维地理信息国际研讨会

作者： B.Domínguez .L.García F.R.Feito Departamento de Informática Escuela Politécnica Superior-Universidad de Jaén Jaén Spain

Software related to urban environments has experimented a considerable growth over the last *** trend makes necessary the creation and management of urban models,both for cities and building *** exists a huge variety of proposals dealing with the geometry,topology and semantics of building *** this paper we give an overview of a number of recent works from several research areas such as Geographic Information Systems(GIS),Building Information Models(BIM),Building Product Models(BPM) and Computer Aided Design(CAD) tools.

关键词： Building Information Models Geographic Information Systems Indoor Representation

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THE STUDY ON LARGE SCALE CITY 3D SCENE RENDERING

THE STUDY ON LARGE SCALE CITY 3D SCENE RENDERING

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国际摄影测量与遥感学会三维城市建模与应用暨第六届三维地理信息国际研讨会

作者： Zhou Yang Xu Qing Xu Kun Lan Chao-zhen Institute of Surveying and Mapping,ZhengZhou 450052,China

The paper researched on rendering art of large scale 3D city sight,and accomplished spatio-temporal data model of city objects taking geometry and action data into account integrated;Referred to the idea of LOD algorithm of terrain quadtree,constituted scene quadtree,and improve search and cull efficiency of discrete city objects;proposed and accomplished a fast collision detection algorithm base on ZUFFER value,this method take full advantage of transform matrix and depth information,accomplished fast collision detection and response when user roaming in the fictitious scene as first *** these technologies,accomplished real time dynamic rendering of large scale 3D city scene.

关键词： spatio-temporal data model metafile relax quadtree collision detection view culling zbuffer depth value

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Building Roof Extraction from LIDAR Point Clouds Using Clustering Techniques

Building Roof Extraction from LIDAR Point Clouds Using Clust...

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国际摄影测量与遥感学会三维城市建模与应用暨第六届三维地理信息国际研讨会

作者： MAO Jianhua ZENG Qihong LIU Xuefeng HUANG Rui(School of Communication and Information Engineering,Shanghai University,Shanghai 200072,China)

This paper presents a method for buildings roof extraction from LIDAR points ***,some possible roofs boundary points were extracted by constructing the TIN model of the buildings' points cloud;secondly,points located on different slope roofs' planes are segmented by clustering techniques on directions of points' normal vectors;and lastly,a distance clustering algorithm was used to find boundary points between stagger *** those three steps,a probably borderline of a building roof can be calculated by connecting its boundary points in *** order to get a regularization borderline,a boundary expanding algorithm is presented at *** the experimental result shows that this method is able to extract effectively all kinds of polygon building roof.

关键词： LIDAR points cloud building roofs extraction clustering TIN

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A method for filling holes in laser scanning data

A method for filling holes in laser scanning data

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国际摄影测量与遥感学会三维城市建模与应用暨第六届三维地理信息国际研讨会

作者： Jiqiang Tana,b,Qingming Zhana,c,Dejiang Lid a State Key Laboratory for Information Engineering in Surveying,Mapping & Remote Sensing(LIESMARS),Wuhan University,129 Luoyu Rd,Wuhan 430079,China b Heilongjiang Bureau of Surveying and Mapping,2 Cehui Rd,Harbin 150081,China c School of Urban Design,Wuhan University,8 Dong Hu Nan Lu,Wuhan 430072,China d Heilongjiang Provincial Research Institute of Surveying and Mapping,2 Cehui Rd,Harbin 150086,China

This paper put forward a method for filling the holes in laser scanning data on the basis of the technology of segmenting scanning lines and *** the interactive approach between human and machine,the holes caused by object reflectance or sheltering were filled to improve the completeness of laser scanning *** hole-filled data provided data support for the effective implementation of further modeling work.

关键词： Laser scanning data Point cloud Filling

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A GENERIC APPROACH FOR 3D SDI in The Netherlands

A GENERIC APPROACH FOR 3D SDI in The Netherlands

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国际摄影测量与遥感学会三维城市建模与应用暨第六届三维地理信息国际研讨会

作者： Jantien Stoter Linda van den Brink George Vosselman Joris Goos Sisi Zlatanova Edward Verbree Rick Klooster Leon van Berlo Gerbrand Vestjens Marcel Reuvers Stefan Thorn Kadaster TU Delft

This paper presents a research project in The Netherlands in which a large number of stakeholders are collaborating on a 3D test bed,selected use cases and a test area to push 3D applications in the *** project studies and realizes a proof of oncept for a 3D Spatial Data Infrastructure,that addresses issues ranging from 3D data acquisition,definition of a 3D standard,maintenance of 3D data and use of the 3D data in specific *** research results in a generic approach to 3D SDI in The Netherlands both at the national level and in specific organizations(for example a municipality)addressing the key aspects of such an *** of the proposed 3D SDI is the 3D standard NL,compatible with international(***)and national standards on 2D and 3D *** innovation in this research is that the main building blocks of a 3D SDI(needs,data,test bed and standards)are studied in coherence to ultimately define a generic approach to 3D.

关键词： 3D modeling 3D SDI 3D applications

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Towards Computer-Aided Collaborative Subway Track Planning in Multi-Scale 3D City and Building Models

Towards Computer-Aided Collaborative Subway Track Planning i...

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国际摄影测量与遥感学会三维城市建模与应用暨第六届三维地理信息国际研讨会

作者： Martin Breunig Stefan Hinz Mathias Menninghaus Thomas Vgtle Ernst Rank Matthus Schilcher André Borrmann Ralf-Peter Mundani Andreas Donaubauer Horst Steuer Karlsruhe Institute of Technology Karlsruhe Germany Technische Universitt München Munich Germany

The planning of road,railway and subway tracks and similar infrastructure in the urban environment-along with the associated over-or underpass structures-is a manifold *** are complex legal,environmental,economic and structural conditions to be ***,the number of participants,some with widely differing skills,knowledge and interests is *** computer-aided collaborative planning for 3D city and building models is a challenge for the 3D geoinfo *** though in practice 2D plans are still the predominent instrument,time seems to be ripe to introduce 3D objects into the planning process right from the *** paper describes the way to facilitate planning processes for subway track planning by developing a collaborative platform supporting the modeling,management,and visualization of 3D multi-scale *** approach to combine research from the fields of collaborative planning platforms,3D modeling,spatiotemporal databases,geo web services,and computer vision is presented.

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Point in Polyhedra Test with Direct Handling of Degeneracies

Point in Polyhedra Test with Direct Handling of Degeneracies

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国际摄影测量与遥感学会三维城市建模与应用暨第六届三维地理信息国际研讨会

作者： CUI Shulin1,ZHANG Shuqing2,CHEN Xuanxi1,1.Department of Computer Science and Technology Zhuhai College of Jilin University Zhuhai,China 2.Northeast Institute of Geography and Agricultural Ecology PANG Zhenping1,FU Xiaoyang1,ZHANG Xu3 Chinese Academy of Sciences Changchun,China 3.Department of Arts Zhuhai College of Jilin University Zhuhai,China

The Point-In-Polyhedron problem is to check whether a point is inside or outside of a given *** a degenerate case is detected,the traditional ray-crossing algorithms avoid the case by selecting a different ray or erase the case by perturbing input *** paper introduces a threshold-based ray-crossing(TBRC) algorithm for solving the Point-In-Polyhedron *** TBRC algorithm copes directly with degenerate cases by checking whether to count the face intersecting with the *** is worth mentioning that the TBRC algorithm can handle all degeneracies without extra computation and ***,we analyze the basic algorithm and examine how to accelerate *** experimental results show that TBRC algorithm is highly efficient and robust for the Point-In-Polyhedron problem,compared to a classical tetrahedron-based algorithm without pre-processing.

关键词： TBRC the edge-face problem Point-In-Polyhedron

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