关于GIS工具软件可视化设计的几点注记

文中从实用的角度 ,结合具体实践 ,对 GIS工具型软件可视化设计及实现阶段的基本问题 ,提出了 Visual C++5.0软件环境中有效的解决方法。     

Analysis of Canada’s Oceanography Research Situations and Latest Trends

Canada is a typical maritime country, fisheries economic prosperity and marine sustainable development have been the main management and research work. From two perspectives of research literatures and latest strategic plans, this paper studied the ocean research priorities and hot trends of Canada. The study found that the marine science and technology in Canada focuses on marine populations and ecosystems, protection of the marine environment and species, marine monitoring and data information, marine technology and management tools, Climate change and arctic research, deep-sea material energy and driving mechanisms. In the future, Canada will continue further study on arctic research, global warming, ecosystem monitoring, deep-sea exploration, marine new energy and new technologies. In summary, Canada’s research situations and development trends may provide a useful reference to China’s development of the marine industry.     

Ubiquitous interactive visualization of 3D mantle convection using a web-portal with Java and Ajax framework

We have developed a new strategy and espouse a novel paradigm for large-scale computing and real-time interactive visualization. This philosophy calls for intense interactive sessions for a couple of hours at a time at the expense of storing data on many disk drives during regular or heroic runs on massively parallel systems. We have already carried out successfully real-time volume-rendering visualization by employing hundreds of processors for a grid with over 25 million unknowns. Both Cartesian and spherical 3D mantle convection are visualized. The volume-rendered images are viewed on a large display device, with many panels holding around 13 million pixels. We will employ a software strategy involving an hierarchical rendering service, which will have as software an Ajax interface for interactive visualization of large data sets on many different platforms from desktop PC’s to hand-held devices, such as the OQO and the Nokia N-800. An option for stereo viewing is also implemented. We have installed a user interface as web application, using Java and Ajax framework in order to achieve over the Internet reasonable accessibility to our ongoing runs. Our goal is to expand the array of interactive devices, which will make it feasible to carry out ubiquitous visualization and monitoring of large-scale simulations or onsite events and to allow for collaborations across oceans.     

三维地质模型在门头沟新城建设规划地质勘查中的应用

三维地质模型具有直观、准确、可分析、可利用等特点,可以为城市规划及土地利用提供科学依据。本文介绍了三维地质模型,在门头沟新城建设规划地质勘查中的应用。     

GIS空间数据电子出版可视化技术研究

地理信息系统不仅发展成为一门成熟的技术科学 ,而且已成为一个新兴的产业 ,在测绘、地质矿产、农林水利、环境监测、区域开发等领域发挥越来越重要的作用。利用地球信息科学领域积累的大量的 GIS数据 ,进行其出版可视化技术研究与实践 ,不仅能够满足 GIS空间数据的出版要求 ,同时对于最大限度地利用 GIS数据资源、避免基础数据的重复投入和提高地图生产效率有着重要的现实意义。本文论述了地理空间数据的类型、关系、矢量数据结构及其在电子出版系统中共享的制约因素 ,讨论了 GIS空间数据在电子出版系统中可视化技术实现的基本方法 ,在实践的基础上提出了两种企业级解决方案。     

天气学的发展概要——关于锋面气旋学说的四个阶段

参照流体力学发展的4个阶段,以锋面气旋模型为例将天气学也分为:"古代"、经典、近代和现代4个发展阶段。"古代"天气学的代表是1863年航海家Fitz-Roy绘制的第一个风暴概念模型,它是对实践经验的总结,但不失其科学性;100年前挪威气象学派锋面气旋模型是基于牛顿力学的经典天气学代表,确立了斜压性是天气变化机理的核心,但将锋面视为物质面是其有悖流体连续性原则的重大缺陷;50年前芝加哥学派的锋面气旋三维模型是基于对准地转动力学理论深刻物理洞察力的近代天气学代表;20世纪末暖锋后弯卷入爆发性气旋模型是高科技时代基于大规模数值计算的现代天气学代表。在大数据时代,现代天气学需要学习和继承近代天气学用深刻的物理洞察力来分析天气学问题。     

Multi‐visibility maps of triangulated terrains

Visibility computation on terrain models is an important research topic with many applications in Geographical Information Systems. A multi‐visibility map is the subdivision of the domain of a terrain into regions that, according to different criteria, encodes the visibility with respect to a set of view elements. We present an approach for visualising approximated multi‐visibility maps of a triangulated terrain corresponding to a set of view elements by using graphics hardware. Our method supports heterogeneous sets of view elements containing points, segments, polygonal chains and polygons and works for weak and strong visibility. Moreover, we are also able to efficiently solve approximated point and polygonal region multi‐visibility queries. To illustrate the usefulness of our approach we present results obtained with an implementation of the proposed algorithms.     

基于气象要素标量对象的可视化及其应用

本文以气象要素标量场为对象，利用体绘制方法来实现其可视化，根据气象数据特点以及可视化对数据集的要求，建立了一个气象要素标量场可视化绘制模型，并给出绘制的实例，能达到实用的效果。     

组件式地图可视化技术探讨

本文介绍了当今最流行的软件技术—组件开发技术 ,以及人们把可视化算法融入组件之后 ,便可为不同层次的人提供最简单的地图可视化实现的途径。