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对于大角度、大范围、复杂场景的快速扫描成像系统,除了要进行任意运动和动态采集建模外,还要对激光传感器的姿态和位置进行实时精确的描述.基于此要求,文中构建了一种基于小型无人直升机机载激光扫描传感器的三维建模成像系统,并设计了一种分步式串级滤波算法,将激光测距传感器得到的距离信息,与小型无人直升机惯性导航系统解算的姿态与位置数据进行融合,实现空间扫描点到基准坐标系的映射,并完成2D行扫描到3D空间的扩展,建立现实世界的3D数字模型. 相似文献
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GU Qian-yi AHMAD Faisal SUMNER Tamara 《浙江大学学报(A卷英文版)》2005,6(11):1306-1311
INTRODUCTION In this paper, we present our work in the Strand Map Service (SMS), which provides concept map based browsing interfaces for resource discovery in a library independent manner within American Na- tional Science Digital Library (NSDL). As critical components of digital libraries, dis- covery systems provide interfaces that support user to search and browse for resources in digital libraries (Hall et al., 1999). The effectiveness of discovery systems has big impact on the… 相似文献
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To describe the spatial tendency and complex relationship of geological structures, a digital modeling based on geographic information system and the visualization of hydroelectric engineering geology information are presented. The functions of information visual query, spatial cutting, section drawing, and coupled analysis with hydraulic structures are realized. The geologic model can match the attribute data with the shape data of geological structures, and organize the information for spatial query and analysis of the 3D model. With an application in Laxiwa hydroelectric project on the upriver of Huanghe River, the method provides a 3D parallel section view and query results of geoinformation, and 3D section views of geoinformation along axis of spillway tunnel,and along the 5th axis with underground structures, respectively. 相似文献
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Silvia Gabrielli Yvonne Rogers Mike Scaife 《Education and Information Technologies》2000,5(4):251-262
Virtual Reality (VR) technology seems to offer the opportunity of designing 3D worlds and navigation activities which provide settings that are close to children's everyday experiences, capitalising on their enthusiasm for videogame-like technologies.This paper describes how different types of exploration of a VR scene by 6[emsp4 ]y-old children affected their performance in a series of spatial tasks. Individual children explored a desktop virtual world where we varied both the visual perspective on the VR scene (route vs. survey view) and the level of exploration control (active vs. passive movement). We measured children's knowledge of the spatial layout of the environment through their memory of objects' location in the virtual scene and through the analysis of their wayfinding abilities within the scene.The results indicate that children were able to develop and display different levels of allocentric knowledge about the virtual world depending on the way they had familiarized with it and on the characteristics of the task demands. This finding contributes to inform the design of VR technologies aimed at supporting or evaluating spatial abilities in children of this age. 相似文献
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微课作为一种新型的网络学习方式,其理论设计、开发制作以及应用创新是研究热点。当前构建三维动画型微课场景存在制作周期长、工作量大等问题。通过研究场景规划,提出一种基于模型标注与区域布局的场景设计规划方法,包括模型数据处理、预规划与计算实现几个步骤,对模型进行数据预处理与标注存储,通过基于知识的方法推导出场景预规划方案,并对模型位置进行动态计算。实验结果表明,该方法能自动生成三维动画型微课场景,场景模型位置规划正确率达到85%。 相似文献
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Web网页是网络课程重要的人机界面,其布局和设计直接影响学习者的学习效果.本文从眼动心理学角度,利用眼动实验研究学习者利用网络课程学习的视觉搜索行为,测量学习者在3种常见的网页布局及其导航样式下学习时的眼动数据,探讨网页布局对网络学习的影响.通过记录注视次数、注视持续时间等6项眼动指标,并结合态度测量,试图揭示学习者学习时的眼动心理生理基本特征,以期找出适宜的网页布局形式和导航样式,为网络课程的设计和开发提出有效建议.实验研究表明：（1）T字型布局有利于学习者进行视觉搜索;（2）国字型布局更有利于学习者对知识的认知加工;（3）学习者进行视觉搜索时兴趣区集中在导航区,进行知识学习时兴趣区集中在主体内容区;（4）学习者在国字型布局下能取得更高的正确率. 相似文献
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Roymieco Carter 《Computer Science Education》2013,23(1):67-90
Computing has become highly visual as interactive programs become increasingly prevalent. Computer science students need to be able to create effective visual displays as part of interface implementation. This paper describes a course covering graphic design topics relevant to computer science students. In this course, students learn the basic visual elements, the visual organizational principles and how to use them in the context of the digital page. The other topics of this paper are the presentation of course information to the computer science student, the implementation of the course information as praxis, course project construction, and a method for critiquing student projects. Curriculum Integration will also be discussed as a feature towards achieving a seamless and collaborative experience. 相似文献
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针对机场净空管理中存在的可视化差、精细管理不足等问题,基于三维Cesium引擎研究机场净空保护区三维信息显示与管理等关键技术。首先,依据规范要求计算障碍物限制面的三维关键点,运用Cesium构建障碍物限制面及预警阈值面的三维模型;然后,通过分层分块组织、线性四叉树索引构建,基于优先等级的数据加载优化实现海量三维数据的调度;最后,以天津机场为例建立管理系统。运行效果表明:该系统可有效提升净空安全管理的数字化水平,为机场高效运行提供了有力保障。 相似文献
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叶海山 《广东技术师范学院学报》2011,(6)
以房地产建设管理系统的特点为基础论述可视化管理系统的优点,提出利用Internet、GIS和三维计算机图形学等技术构建基于B/S的房地产项目三维可视化管理系统的思想,重点介绍系统设计和系统实现的关键技术.该系统采用Visual Studio来实现各功能模块,以直观的形式动态显示工程进展状态. 相似文献
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我国政府信息资源在建设与发展过程中存在着资源布局缺乏整体规划、信息技术缺乏统一标准、信息类型复杂多样和部门间的信息利益冲突等多方面的问题。如何在加强数据协同相关性的基础上,通过加强政府信息资源整合来提高信息资源的综合应用集成能力,从而实现政府数字信息资源的高度共享,这对构建社会化的信息服务系统,打造高效的电子政务具有重要的理论指导和现实意义。 相似文献
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当前,高校数字图书馆建设中新媒体的应用路径主要有利用移动通讯媒体进行高校图书馆的数字化建设、利用RSS开展图书馆信息发送服务、利用Wiki和分众分类模式等建立图书馆的资源导航库、利用搜索引擎建设Google图书馆、利用数字电视开辟新的服务栏目等。 相似文献
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虚拟漫游系统是虚拟现实技术在校园展示、建筑设计、结构和工业设计市场的应用,具有广泛的应用前景。虚拟现实漫游系统不仅仅需要提供实时、交互性的三维场景,还需要提供传统表现方式无法比拟的、崭新的信息交流界面。文章阐述了基于PC平台的校园虚拟漫游系统的设计,实现了贵州大学校园虚拟漫游系统。主要介绍使用的Virtools虚拟引擎结合平面、三维图形设计软件Photoshop、AutoCAD、Sketch Up、Vue xStream、3ds max等软件实现校园漫游系统的开发过程。 相似文献
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期刊资源建设与整合是一项系统工程,本文分析了两种载体期刊的异同和收藏利用中的突出问题,提出建立高职馆期刊收藏与服务体系,开展数字资源利用培训,做好期刊资源的推广与利用,建立期刊资源导航,利用校园网络,创建一站式的资源检索与服务平台,有针对性地开发教学专题期刊数据库,开发地方文献数据库,向社会开发馆藏资源等。 相似文献
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新一代信息技术的突破与应用,变革了资源开发行业技术发展趋势与人才需求,传统的教学方法急需改变。文章基于建构主义学习理论,设计了应用于矿业工程学科的数字场景体验式教学方法,梳理并融合专业知识体系,运用虚拟现实与系统仿真技术,以真实世界与真实任务为依据,开发数字场景教学资源库,建设数字教学云平台;形成以学习者为主体、以核心素养发展为中心,采用信息化教育手段、在数字空间完成学习的教学模式。教学实践表明,该方法提高了学习效率与效果,利于适应当前时代特征的多专业复合型人才的培养。 相似文献
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论文首先阐述了建立天然气长输管网信息系统建设的必要性和紧迫性,对系统的用户需求进行了分析,论述了系统的设计原则、目标。研究了天然气长输管网信息系统的总体设计和功能模块设计。并针对目前我国天然气长输管网数字化建设的设计、竣工等资料,以及设备信息和数字化管网运行阶段的信息特点,论述了系统数据库的内容和组织,并设计系统数据库,对管网进行完整性管理。最后论文以具体项目为研究对象,构建了天然气长输管网信息系统应用平台。系统实现了管道地理信息管理、日常生产管理,管道巡检,以及安全决策等相关功能,为各级天然气管理部门提供了实用的管理决策依据。 相似文献
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Any tidal defense engineering involves the collection and analysis of massive information about engineering structures and their surrounding environment. Traditional method, which is carried out mainly by means of twodimensional drawings and textures, is not efficient and intuitive enough to analyze the whole project and reflect its spatial relationship. Three-dimensional visual simulation provides an advanced technical means of solving this problem. In this paper, triangular irregular network (TIN) model simplified by non-uniform rational B-splines (NURBS) technique was used to establish the digital terrain model (DTM) of a super large region. Simulation of dynamic water surface was realized by combining noise function with sine wave superposition method. Models of different objects were established with different modeling techniques according to their characteristics. Application of texture mapping technology remarkably improved the authenticity of the models. Taking the tidal defense engineering in the new coastal region of Tianjin as a case study, three-dimensional visual simulation and dynamic roaming of the study area were realized, providing visual analysis and visible demonstration method for the management and emergency decision-making associated with construction. 相似文献
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This paper describes ‘Fly’s Eye View', a project devised and directed by David Smith and supported by a grant from the UK Techniquest Pantechnicon Millennium Awards (intended to help bridge the gap in public perception between science and art). ‘Fly’s Eye View' was specifically aimed at young children, aged 7–11 years (Key Stage Two of the UK National Curriculum). The project used a low-level VR fly-by system to represent a garden scene as it might be experienced by a dragonfly. The analogy between the mosaic visual ‘perception’ of insects and image representation in computer systems allowed some interesting explorations into what may be involved in ‘seeing’. This analogy was used as the starting point for a series of exploratory activities using digital art work. The paper reviews the outcomes of the project and discusses their possible significance in the context of current approaches to art education and the stimulation of creative thinking in young children. 相似文献
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文章分析了信息可视化技术在教学资源检索与导航系统中应用的可行性和表示机制,提出了一种教学资源可视化检索与导航模型,并通过开源软件设计了实验系统加以验证,为学科导航系统的研究和建设提供了一个新的思路。 相似文献