共查询到18条相似文献,搜索用时 125 毫秒
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文章从人体手臂结构及运动继承关系分析入手建立人体手臂运动仿真模型,并采用C++和面向对象方法进行OpenGL编程,实现了三维人体手臂交互式实时运动仿真。 相似文献
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城市交通的计算机仿真设计 总被引:6,自引:1,他引:5
根据城市交通系统的现状,利用面向对象方法和面向对象程序设计语言,通过实现城市交通的基本点-交叉口之间的计算机仿真设计,最终实现实时的优化控制。 相似文献
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应用UML进行企业信息系统的面向对象建模 总被引:7,自引:0,他引:7
UML已成为可视化建模语言事实上的工业标准。各种面向对象方法都可以采用UML进行对象建模,从而消除了术语、符号的歧义。文章首先简单介绍了UML的背景,然后详细描述了如何应用UML进行集装箱货运站业务信息系统的面向对象建模,以期对应用UML进行类似企业信息系统的面向对象建模有所帮助。 相似文献
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交通电子地图设计和制作 总被引:11,自引:0,他引:11
结合电子地图设计和制作过程中所使用的软、硬件,并且根据电子地图所具有的地图图层以及相应的图层属性,提出了一套与交通有关的电子地图设计与制作方法,并用此方法成功地设计和制作了一幅交通电子地图用于GPS导航实验中。 相似文献
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文章运用计算机新的软件开发工具和面向对象的开发思想,实现了基于数据库的公路路线平面辅助设计系统。该系统采用数据库对数据进行统一管理,避免了文件组织方式的缺点,提高了设计的效率。 相似文献
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张桥 《内蒙古公路与运输》2014,(5):13-15
公路电子地图是将GPS测量数据和数模地理底图及属性结合起来表述的计算机应用技术,文章从内蒙古自治区公路电子地图应用背景、特点、数据采集及制作方法等方面进行阐述。 相似文献
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针对海量浮动车数据特点和快速处理要求,提出了一种基于矢量道路地图栅格化的海量浮动车数据方法,该算法的关键是矢量道路栅格化过程中包括了道路缓冲区和属性信息。道路缓冲区的宽度由一个与浮动车数据位置误差和道路宽度相关的置信区域决定;矢量道路缓冲区转换成栅格图后,栅格图中像素的位置对应着实际地理坐标,而像素值的灰度值表示道路的等级、名称、编号等属性或方向等信息;然后将海量浮动车数据与栅格道路地图进行叠加处理。这种方法不仅可以精确地计算出城市道路地图坐标系与浮动车数据坐标系之间的变换参数,而且还能够快速地获取区域路网以及特定道路的行驶速度。最后,通过超过一千万个真实的武汉市浮动车数据,并与经典的浮动车数据处理算法进行比较,验证了矢量道路栅格化方法处理海量浮动车数据的可行性和有效性。 相似文献
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《国际交通安全学会研究报告》2022,46(4):450-456
Map-based self-localization estimates the pose of the self-driving vehicle in an environment, becoming an essential part of autonomous driving tasks. Generally, maps used in self-localization have detailed geometric information on an environment in formats such as point cloud maps and Gaussian mixture model (GMM) maps. As other maps are widely developed for autonomous driving, vector maps store more object-focused information, such as buildings and road facilities, for navigation and scene understanding in autonomous driving tasks. However, it is not compatible with self-localization due to the lack of detailed geometric information. The two different map formats of vector maps and maps for self-localization complicate the management, preventing the development of the area where a self-driving vehicle can drive stably. This paper proposes a unified map format with a hierarchical structure that enables both vector maps and self-localization maps (i.e., GMM maps) to be managed more easily. Because proposed maps can be treated as vector maps at the high-level layer, various tasks related to navigation and scene understanding in autonomous driving can utilize. A GMM map is stored at the low-level layer associated with a vector map component, enabling accurate self-localization in an environment. The proposed map format is compatible with vector maps widely developed by mapping companies on the surface and facilitates future map management. The experimental results of self-localization in urban areas showed that the proposed map gives the competitive self-localization accuracy compared with the GMM map even with fewer cells that link to vector components. The proposed maps enable self-localization with sufficient accuracy for safe autonomous driving operations. 相似文献
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基于浮动车移动检测与感应线圈融合技术的行程时间估计模型 总被引:7,自引:0,他引:7
综合考虑到浮动车检测技术与感应线圈检测技术的优缺点,为了提高道路行程时间估计的精度及完备性,提出基于浮动车与感应线圈的融合检测技术的行程时间估计模型。该模型利用神经网络技术对两种检测技术同一路段的检测数据进行融合,从而达到提高道路行程时间估计精度和完备性的目的。最后,以广州市7 000多辆装有GPS装置的出租车所提供的浮动车数据、100多个安装在广州市各主要道路口上的感应线圈检测器提供的感应线圈数据以及广州市交通电子地图为基础,在10条道路上分别随机选取的500个两种检测数据对提出的模型进行了验证,试验结果表明,此模型在道路行程时间估计的精度方面较浮动车移动检测技术与感应线圈技术有较大提高。 相似文献
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从设计层面分析了山区高速公路水毁发生的原因及传统设计方法的弊端,提出了基于GIS的山区高速公路排水设计方法和流程,设计了排水GIS的系统框架。基于面向对象的数据建模方法建立了路域数字地形模型、水文数据模型,实现了对路域空间数据和水文数据的有效管理。研究了路域水文建模算法,建立了路域水文空间分析模型。结合依托项目,对基于GIS的山区高速公路排水设施布设方法进行了验证,并对排水设施进行了水力仿真与评估。仿真结果表明:通过山区高速公路排水GIS建模与仿真,可进行排水设施的综合布设及适应性评估,实现了排水设计的自动化、可视化、科学化。 相似文献
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Accurate vehicle self-localization is significant for autonomous driving. The localization techniques based on Global Navigation Satellite System (GNSS) cannot achieve the required accuracy in urban canyons. On the other hand, simultaneous localization and mapping (SLAM) methods suffer from the error accumulation problem. State-of-the-art localization approaches adopt 3D Light Detection and Ranging (Lidar) to observe the surrounding environment and match the observation with a priori known 3D point cloud map for estimating the position of the vehicle within the map. However, storing the massive point cloud needs immense storage on the vehicle, or it should be stored on servers, which makes the simultaneous downloading of the map by multiple vehicles another challenge. In this study, rather than employing the point cloud directly as the prior map, we focus on the abstract map of buildings, which is easy to extract, and at the same time apparently observable by Lidar. More especially, we proposed vehicle localization methods based on two different abstract map formats representing urban areas. The first format is the multilayer 2D vector map of building footprints, which represents the building boundaries using vectors (lines). The second format is the planar surface map of buildings and ground. These map formats share the same idea that the uncertainty (deviation) of each vector or planar surface is calculated and included in the map. Later in the localization phase, the observed data from Lidar is matched with the abstract map to obtain the precise location of the vehicle. Experiments conducted in a dense urban area of Tokyo show that even though we significantly shrank the map size, we could preserve the mean error of the localization. 相似文献
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运用Eclipse RCP技术、集成WindowBuilder、Hibernate3.2、JFreechart、PO12.5等多种开发工具,以MapXtremeJava4.8为地图服务器,选用Oracle10g数据库,设计并开发了隧道施工通风安全信息系统,具有日常管理、电子地图、数据分析、声光报警、短信提醒等特点,实现了隧道施工通风安全信息的可视化管理。 相似文献