Map-Based Web Tools Supporting Climate Change Adaptation

This article discusses the state of the art in geovisualization supporting climate change adaptation. We reviewed twenty selected map-based Web tools, classified by their content and functionality, and assessed them by visual representations, interactive functions, information type, target audience, and how vulnerability and adaptation to climate change are addressed. Our study concludes that the tools (1) can be classified as data viewers with basic functionality and data explorers offering more sophisticated interactive functions; (2) mostly feature moderate or high richness of data content; and (3) predominantly target expert users.     

3D打印技术在矿床学中的应用研究——以内蒙古乌力吉敖包萤石矿Ⅲ号矿体为例

3D打印(3D printing)是一种以三维模型为样本的快速成形技术,它通过逐层打印或粉末熔铸的方式来构造需要的立体图形。本文从3D打印技术的原理及其发展现状入手,重点列举内蒙古乌力吉敖包萤石矿,利用3D打印机打印具有现实可观性的地质体实体,探讨3D打印技术作为新兴的科技手段应用于矿床学教学与研究的应用价值和发展前景。研究发现,3D打印技术在矿体三维可视化中的应用符合地质图件立体化和3D打印技术多领域化的趋势,未来3D打印技术在地质领域的应用也有助于开拓矿床学教学和研究的新方式与新思路。     

A virtual globe-based time-critical adaptive visualization method for 3D city models

3D city models, which are important items of content on the virtual globe, are characterized by complicated structures and large amounts of data. These factors make the visualization of 3D city models highly dependent upon the performance of computer hardware. Thus, achieving the efficient rendering of 3D city models using different hardware performance levels represents one of the key problems currently facing researchers. This paper proposes a time-critical adaptive visualization method that first estimates the possible rendering time for each model according to the data structure of the model in addition to the CPU/GPU performance of the computer. It then dynamically adjusts the rendering level for each model based on the results of an estimation of the rendering time to ensure that the final scene can be completed within a given time. To verify the effectiveness and flexibility of this method, it is applied using different computers. The results show that the adaptive visualization method presented in this paper not only can adapt to computers with different levels of performances but also demonstrates an obvious improvement in the time estimation precision, visual effects, and optimization speed relative to existing adaptive visualization methods.     

虚拟现实技术在城市规划中的应用研究与实践

从虚拟现实的概念出发,分析了虚拟现实的3个特征,论述了虚拟现实技术涉及到的关键技术及虚拟现实技术在城市规划中的应用。最后,我们以小区为研究对象,将3D数据作为数据源,采用VRMap软件平台进行将VR技术应用于城市规划中的研究与试验。     

基于MultiGen Creator/Vega的虚拟图书馆设计研究

以虚拟图书馆为研究对象,利用MuhiGen Creator和Vega进行建模和系统设计。本文论述了在图书馆模型建立过程中层次结构模型、细节层次结构、实例技术和纹理贴图等技术的实现,以及使用Vega及其提供的API函数的系统开发方法。研究证明,采用MuhiGen Creator和Vega将虚拟现实技术与数字图书馆结合的方案可行．并具有较大的开发空间。     

双经纬仪虚拟像坐标二维直接定位

提出了一种基于虚拟左、右像片像空间坐标系的二维直接定位法,可快速提取工业测量系统两台经纬仪之间的相对定位元素并完成相对定位。它不用进行迭代,既可以在右测站的定位元素未知时进行定位元素的解算,又具有简单清楚的几何意义。最后用算例对算法进行了验证。     

高密度电法的三维数据场可视化

高密度电法是重要物探方法之一,由于它具有施工快捷、分辨率高、可靠性好、图像直观等优点,已被广泛应用于寻找金属非金属矿、地下水及各类工程地质勘察等众多领域.目前,该方法在数据资料处理方面还局限在二维图像.本文结合在山西阳泉复杂采空区利用高密度电法和高精度GPS测量联合勘察的工程实例,基于WinDisp软件平台,实现了高密度电法的三维数据场可视化,构建了视电阻率参数下的三维地质体结构模型,并且可以任意移动、旋转、切片、分层显示、实时显示真实地理坐标等.该模型客观、真实、形象地反映了电性异常的三维地质结构,为高分辨率预测复杂采空区的空间分布特征提供了直观、可靠的资料.     

基于R语言的NetCDF文件分析和可视化应用

气象领域目前有多种广泛应用的气象数据分析和可视化工具集,包括GrADS、NCL、CDO和IDL等。R语言是一种由统计学家开发的统计计算和绘图的语言和环境,具有大数据处理的能力。R语言数量众多的扩展包为R语言用于海量气象数据分析和可视化提供了强有力的支持。基于R语言对NCEP发布的数据集进行了统计分析和可视化,展示了R语言在气象数据处理和可视化方面的应用。结合R语言提供的贝叶斯统计扩展包和高性能并行计算扩展包探讨了R语言在气象数据处理和可视化应用方面的广泛前景。     

网格虚拟地理环境体系结构研究

通过将网格技术与虚拟地理环境结合,以服务为核心,构造虚拟数据库,形成网格虚拟地理环境(G ridV irtual Geograph ic Environm ent,G rid-VGE),实现异构数据的集成与共享、任务的分解、闲散资源的充分利用、扩充虚拟地理环境的服务等。在详细阐述了G rid-VGE的框架结构及其关键技术的探讨后,以三维可视化地形漫游为例展示G rid-VGE中的一个应用实例。     

Changes in agricultural virtual water in Central Asia, 1992–2016

Journal of Geographical Sciences - In recent years, flows of many rivers and lakes have become reduced in arid and semi-arid regions around the world. The most typical examples of this phenomenon...