Interactive generalization on large-scale topographical map supported by a database platform

This paper makes a study on the interactive digital generalization, where map generalization can be divided into intellective reasoning procedure and operational procedure, which are done by human and computer, respectively. And an interactive map generalization environment for large scale topographic map is then designed and realized. This research focuses on: ① the significance of researching an interactive map generalization environment,② the features of large scale topographic map and interactive map generalization, ③ the construction of map generalization-oriented database platform.     

公路隧道辅助设计软件的新思路研究

研究了现有公路隧道辅助设计软件的思路和技术特点,结合公路隧道设计过程的实际需要,提出了公路隧道辅助设计软件的新思路,即建模和出图采用参数式与交互式相结合,计算、优化与出图集成统一。这些思路已经在作者开发的公路隧道设计软件中实现,证明了技术的可行性。该软件在同济曙光软件平台上开发,具有修改、实时更新的图形建模和出图功能,结合施工过程的有限元及其它数值方法的分析计算功能,并采用遗传算法等多种优化方法对结构进行最优化设计,具有后处理显示、可视化图纸管理、图纸库等功能。该软件能使整个公路隧道设计、计算、出图在统一的环境下完成,能有效提高公路隧道设计的效率。     

NONHYDROSTATIC NUMERICAL SIMULATION FOR THE “96.8” EXTRAORDINARY RAINSTORM AND THE DEVELOPING STRUCTURE OF MESOSCALE SYSTEM*

During the period of 3—5 August 1996(for short "96.8"),an extraordinary rainstorm event occurred in Henan,Hebei and Shanxi Provinces in China,resulting in severe flood catastrophe.Synoptic analyses indicated that the stable gross col field and the interaction between a northward moving typhoon(down into low pressure)and its east lateral Pacific subtropical high were the large-and meso-scale circulation conditions of the "96.8" extraordinary rainstorm.The mesoscale typhoon-low and its specific dynamical and thermodynamical structures were directly related to this rainstorm event.The nonhydrostatic version of mesoscale numerical model MM5 was used to conduct investigation of numerical simulation for this case.The simulation with the full physical processes of nonhydrostatic version MM5 was basically possessed of a capability to reproduce the genesis,development and evolution of the large-scale and meso-α scale synoptic systems.The simulative results using a two-way interactive nesting procedure revealed that the typhoon-low was possessed of an intensive coupled mechanism between the dynamical and thermodynamical fields,namely,the developing typhoon-low was possessed of a structure of the.cyclonic vorticity column with warm center and high humidity,the vorticity column on the lower levels was the moist convective instability and negative moist potential vorticity structure:the intensive ascending vertical motion and the intense divergence on upper levels and intensive convergence on the lower levels as well as the development of the convective cloud cluster were intercoupling:the intense southern wind jet companied by the typhoon-low was not only the interaccompanying and intercoupling condition of the development and maintenance of the typhoon-low and convective cloud cluster,but also was the transportable belt of the moisture source and heat energy of the "96.8" extraordinary rainstorm.The analysis of simulative results of precipitation indicated that the distribution of the rainfall belt and rainfall rate was basically consistent with that of the observation in spite of some rainfall centers less or larger than those of the observation for coarse or fine mesh domain,respectively.     

区域持续发展的指标研究

本文在总结、概括已有指标的基础上,提出了区域人地相互作用潜力三维指标体系,通过这一潜力空间来综合测度区域持续发展水平,能力和前景。本文在总结,     

位场局部异常人机交互解释系统的软件设计

本文详细介绍了位场局部异常人机交互解释系统软件设计的细节和技巧。本系统的软件设计采用了受到广泛欢迎的菜单驱动的用户界面程序设计风格，力图模仿Ｔｕｒｂｏ系列软件的菜单样式和功能，为使用本软件系统尽可能提供方便。     

三维虚拟校园的设计与实现

提出了通过CCGIS5.0中VRModel模块对地物进行三维建模,利用Visual C 6.0 GeoLOD5.0控件实现交互式三维虚拟校园系统的方法,并以东北林业大学为例,实现了三维虚拟校园的设计和开发,取得了较好的实时性、交互性和良好的视觉效果.     

面向景观规划设计的数字地形交互式编辑技术

 数字地形编辑是虚拟地理环境、三维景观仿真系统中一个重要的研究内容,在城市与乡村、区域道路网、风景园林的数字化规划设计实践中具有重要价值。本文以规则格网的数字地形为研究对象,面向城市和园林景观规划设计中的实际应用,提出了交互式数字地形编辑的解决方案,重点给出了分页技术的地形交互式编辑具体过程和相关的主要实现技术。数字地形编辑的实现,首先,通过鼠标交互式操作,结合射线求交算法,在地形表面选取目标编辑区域;然后,结合夹角之和检测算法,获取区域下地形数据,设定新的地形高程值,最后,将编辑操作传输至地形其他层,更新整个地形,并在地形编辑后,采用方格网计算法,统计出区域下地形填挖方量。此外,在经过平整的地形区域,植入树和三维建筑模型,构建虚拟城镇小区景观。本文初步实现了编辑操作功能的计算机软件,并展示了数字地形编辑在城镇小区景观设计中的应用结果。试验表明,基于规则格网和分页技术的数字地形编辑方法具有算法简单、计算量小、易实现等特点。此外,通过鼠标交互式的操作,能够实时、直观地显示编辑结果,达到"所见即所得"的效果。     

基于ECharts的FerryBox水文数据可视化研究

为实现FerryBox数据真实、高效的可视化表达,针对该系统采集数据时数据空间和时间同时变化等特点,在全面分析了目前FerryBox数据可视化方案存在的不足的基础上,结合图表库ECharts.js及Web前端技术,提出了一套FerryBox交互式可视化方案。实验表明,该方案具有一定的可行性和高效性,可以为FerryBox在水环境观测领域的应用提供有效的可视化平台。     

环境信息科学可视化表达与交互研究

灵活的科学可视化表达与交互手段能有效地展示隐藏在数据背后的空间特性及空间关系.在分析科学可视化概念和特点的基础上,探讨其在动态环境信息表达、环境信息可视化交互探索分析方面的应用,并以江苏省城市空气质量评价专题为例,采用ArcGIS Server基础平台,利用rich internet application(RIA)技术,对Web环境下环境信息的科学可视化进行实例研究.     

甘肃农村工业化与城镇化互动关系

城镇化与工业化之间具有密不可分的联系,它们相互制约、相互促进、共同发展。在对甘肃农村工业化和农村城镇化的关系进行定量分析的基础上,得出结论:(1)乡镇企业发展是甘肃农村城镇化的重要推动力(回归结果显示城镇化进程的指标和大部分乡镇企业发展的指标间存在着很强的相关关系);(2)现阶段乡镇企业在全省各县区城镇化进程中的作用已相对局限(在对2003年截面数据的相关分析中乡镇企业就业人数和城镇化水平之间的相关关系极其微弱,相关系数为0.058);(3)甘肃乡镇企业发展中存在的诸如经营规模过小、资金短缺、技术层次低、从业人员素质低以及体制制度方面存在缺陷等一系列问题和小城镇发展中存在的规模过小、建设档次低、布局分散、职能趋同性强等问题致使乡镇企业发展和农村城镇化发展在现阶段没有能很好地相互推动和促进。