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GPU ray casting method for visualizing 3D pipelines in a virtual globe

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International Journal of Digital Earth 2019年第4期12卷 428-441页

作者： Zhaocong Wu Nan Wang Jie Shao Guohui Deng School of Remote Sensing and Information Engineering Wuhan UniversityWuhanPeople’s Republic of China State Key Laboratory of Remote Sensing Science Institute of Remote Sensing Science and EngineeringFaculty of Geographical ScienceBeijing Normal UniversityBeijingPeople’s Republic of China

Pipelines are an important part of urban infrastructure *** part of a virtual globe(VG),the high-efficiency and high-quality visualization of 3D large-scale and high-density urban pipelines is of great *** paper proposes a GPU-based pipeline ray casting method for the visualization of urban-scale pipelines in the framework of a *** method involves the initial partitioning of the pipeline data into tiles,based on the relationship between the pipeline layer scale and the discrete global grid system(DGGSs).The pipeline centerline in each tile is then segmented and encoded,and a coarser pipeline bounding volume is subsequently constructed using a geometry ***,the fine 3D pipeline is rendered using a pixel *** results of the experimental implementation of the proposed method show that it satisfies the requirements for the multiscale visualization of pipelines in a ***,compared with the traditional polygon-based method,the method facilitates a 20%increase in rendering frame rate for the same pixel level accuracy display *** also enables the visualization of the thickness of the 3D pipeline without any obvious effect on the rendering efficiency。

关键词： virtual globe multiscale visualization ray casting method massive pipeline 3D visualization

virtual globe-based integration and sharing service method of GeoSpatial Information

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Science China Earth Sciences 2013年第11期56卷 1780-1790页

作者： CHEN Jing XIANG LongGang GONG JianYa State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan University

How to integrate and disseminate globally distributed multi-source and heterogeneous spatial information is an open problem in integration and sharing service of geographic information. Here we propose a new service architecture suitable for integra- tion and sharing of distributed multi-source geographic information. We also propose a global virtual pyramid model, which can be applied in 3D virtual globes. In view of the difficulty of web multi-node geographic information sharing service, we propose a web multi-node service aggregation method, integrated in our autonomously developed virtual globe platform Geo- globe and introduced in the National Platform for Common GeoSpatial Information Services named ＂T1ANDITU＂. It achieves 2D and 3D integration for geographic information service.

关键词： virtual globe service aggregation National Platform for Common GeoSpatial Information Services

Implementation of a 3D WebGIS for Dynamic Geo-Referencing of 3D Tiles on the virtual globe

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Journal of Geographic Information System 2023年第5期15卷 440-457页

作者： Kyongil Woo Adrian Onsen Wonsok Kim Institute of Remote Sensing and Geoinformatics Academy of Science Pyongyang Democratic People’s Republic of Korea

Needs for real-time interactive visualization of 3D Tiles for massive 3D content on the web-based virtual globe is rapidly increasing, and to achieve this goal, 3D Tiles needs to be correctly geo-referenced to other geospatial data on a web-based virtual globe. It is possible to generate 3D Tiles from different kinds of spatial data through various software tools. However, due to various factors the 3D Tile datasets are often poorly or not at all geo-referenced. To tackle this issue, we propose a new 3D WebGIS framework that facilitates dynamic geo-referencing 3D Tiles on the CesiumJS virtual globe.

关键词： 3D Tiles 3D WebGIS CesiumJS Geo-Referencing virtual globe

基于virtual globe的三峡库区立体灾害地质图系统集成技术

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基于Virtual Globe的三峡库区立体灾害地质图系统集成技术

A multistage collaborative 3D GIS to support public participation

第十届全国数学地质与地学信息学术研讨会

作者：刘刚吴冲龙刘军旗吴勇张军强中国地质大学(武汉)计算机学院信息所中国地质大学(武汉)教育部三峡地质灾害研究中心

"立体灾害地质图软件及图库建设"是三峡库区地质灾害防治及预警指挥系统的重要组成部分。具体要求是利用1:10000二维灾害地质图和地表DEM数据,以三维可视化的方式表达地质灾害的易发性分区、灾害体分布和地质灾害的危害对象等信息,并能... 详细信息

"立体灾害地质图软件及图库建设"是三峡库区地质灾害防治及预警指挥系统的重要组成部分。具体要求是利用1:10000二维灾害地质图和地表DEM数据,以三维可视化的方式表达地质灾害的易发性分区、灾害体分布和地质灾害的危害对象等信息,并能在此区域三维模型上进行多种专业分析。三峡库区灾害地质图具有比例尺大、内容丰富和图幅众多的特点,其海量数据的入库和应用管理难度大。同时要求用三维可视化的方式对灾害地质图进行展现,实现立体效果增强和有关地质分析功能。由于库区图幅分布东西向延伸长,并存在跨带现象,如何实现大区域多图幅数据集成显示与三维可视化是必须解决的问题。同时,还需要实现立体地质图子系统与库区预警指挥系统的整体集成和功能集成。能够提供统一的球面地理坐标定位和地表三维可视化功能的virtual globe系统正好适应了本系统研发的基本技术要求,因此被确定为系统数据集成和功能集成的研发平台。virtual globe是指通过三维可视化引擎,在用户桌面显示一个数字化地球的可视化平台,用户可以在三维空间尺度对整个地球进行漫游,缩放等操作。比较著名的virtual globe系统包括Google Earth,NASA World Wind,ArcG lobe,Skyline等。我们选用Arc globe作为二次开发平台,以Oracle数据库进行存储管理,基于C#语言实现了灾害地质图空间数据库、DEM数据库和遥感影像库的集成调用,能够满足大区域多图幅灾害地质图显示浏览,并在此基础上实现了专题属性信息查询、任意图切剖面图、三维灾害体模型调用和方量统计等分析功能,形成了专业化的三维可视化应用系统。集成环境中立体灾害地质图软件实现的主要功能包括:(1)方便地读取灾害地质图空间数据库的数据,并提供文件模式和数据库模式两种类型的应用环境;(2)采用Arc SDE和Oracle数据库管理数据,有利于数据安全;(3)二维和三维灾害地质图线型和区域花纹保持统一,专业图示图例显示效果良好。(4)提供立体地质图浏览和缩放功能,能够进行属性查询和距离量算,并具备灾害点三维灾害体模型集成查询分析功能;(5)可以快速地交互式生成任意剖面线对应的图切剖面,并实现了剖面图成果图的入库管理;(6)可以方便地进行立体地质图和剖面图的打印输出,提供了相应的打印模板。目前系统已完成了三峡库区典型立体灾害地质图的系统测试和与预警指挥系统平台的功能集成,达到了项目设计的要求,实际运行效果良好。由于是基于ArcG lobe平台开发,目前在数据量大的情况下运行和浏览效率还不是很高,下一步需要结合平台的升级进行数据预处理和简化等方面的改进和优化。

关键词：立体灾害地质图系统集成 virtual globe 地质剖面图空间数据库

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International Journal of Digital Earth 2015年第3期8卷 212-234页

作者： Yingjie Hu Zhenhua Lv Jianping Wu Krzysztof Janowicz Xizhi Zhao Bailang Yu Key Laboratory of Geographic Information Science Ministry of EducationEast China Normal UniversityShanghaiPR China Department of Geography University of California Santa BarbaraSanta BarbaraCAUSA Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration East China Normal UniversityShanghaiPR China

This paper presents a collaborative 3D GIS to support public *** that public-involved decision-making is often a multistage process,the proposed system is designed to provide coherent support for collaborations in the different *** differentiate ubiquitous participation and intensive participation and identify their suitable application *** proposed system,then,supports both of the two types of participation by providing synchronous and asynchronous collabora-tion *** the concept of Digital Earth,the proposed system also features a virtual globe-based user *** an interface integrates a variety of data,functions,and services into a unified virtual environment which is delivered to both experts and public participants through the *** system has been designed as a general software framework and can be tailored for specific *** this study,we demonstrate it using a scene modeling case and provide a preliminary evaluation toward its usability.

关键词： public participation multistage decision-making 3D visualization virtual globe online collaboration Digital Earth

Editing Vector Graphics in the virtual Simulation Environment

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Computer Aided Drafting,Design and Manufacturing 2014年第2期24卷 23-29页

作者： SHI Xiao-long LAI Shun-nan Shenzhen Graduate School Beijing Engineering Technology Research Center of Virtual Simulation and Visualization School of Electronics Engineering and Computer Science Peking University

We present a method to represent multi-resolution vector graphics such as road networks or railway networks in virtual environment. These vector data can be interactively edited and the landscape and be explored in real time at any altitude from flight view to car view. We design a context-focused vector description of linear can areal features, with associated customized definition painter to specify their appearance （color and material） and their display mode （detailed mode or simplified mode）. There are some special problems in drawing vector graphics in virtual environment. Floating-point round-off error appear when we use a low view point to observe the scene, and it leads to scene jittering. Drawing 3D wide lines turns into a problem on 3D terrain. We design a view-based self-adaptive interpolation algorithm and an offset line generating algorithm to solve it. Our results show high performance with good visual quality.

关键词： vector graphics virtual reality virtual globe