基于Google Earth的交互式三维虚拟校园研究

虚拟校园系统在真三维平台上直观、形象地展现校园场景。以成都理工大学主校区为例,论述了利用虚拟现实技术创建交互式三维虚拟校园的流程。利用SketchUp建立虚拟校园三维模型,导入Google Earth,再将Google Earth嵌至C#应用程序中,从而既可显示校园基本地物特征,又允许用户进行信息查询,还可使用三维飞行功能进行漫游,满足三维视景动态可视化要求。     

三维态势图中标绘箭头的实时约束变形

针对三维态势图中实时态势标绘的要求,首先建立标准的态势标绘箭头网格模型,然后利用网格形变使其能被实时地改变形状以满足不同场合的需求;为提高绘制效率,将网格的形变过程约束在二维环境中内进行,同时引入了LOD技术。最后,运用VC＋＋6.0和OpenGL开发工具,实现了三维场景中的态势标绘箭头的实时形变仿真。实验证明该算法实现的三维态势标绘箭头满足实时性和逼真性的要求,可直接运用于各种三维态势标绘系统中。     

机载三维成像系统

本文简要地阐述了新型机载三维成像系统的产生环境、原理、技术结构、特色及应用领域 ,介绍了飞行检测、应用飞行所取得的成果。为实现高效遥感对地观测体系迈出的第一步。     

桂林市电子沙盘设计及其功能

桂林市电子沙盘的开发采用了3S技术、多媒体技术和数字化技术, 它以数字化的地形图为基础数据源, 建立数字高程模型; 以卫星遥感数字图像为三维景观的表层粘模。电子沙盘具有二维平面-三维立体图对照显示,任意调整观察的位置、高度、方位、视角等功能, 并可以按预设的路线在空中模拟飞行观察, 给人亲临其境的感觉。同时, 它具有绘制剖面、求算任意区域地表面积和土石方量(水库库容)等功能, 突破传统沙盘的概念。     

中国国家自然地图集——电子地图集的研制

该文包括三部分:(1)中国自然资源与环境空间信息的系统集成与形象显示。"中国国家自然地图集-中国自然资源与环境的形象显示与虚拟》(电子图集)在"中华人民共和国国家自然地图集"的基础上,再度创作,信息重组,并有所创新;(2)体系结构和关键技术:体系结构和技术系统,关键技术问题的解决(开发平台的选择、地理信息的三维数据模型与三维可视化、地理信息的动态数据模型与时态可视化、虚拟地图可视化、多源多类数据的集成);(3)主要创新与特色:独特的交互界面结构,别致的动态交互工具,各种形式的动态地图,丰富的三维地图浏览,生动形象的三维地形虚拟飞行浏览,新颖的多种表达方式的联合,查询检索与地图分析功能。     

基于WebGL的二维三维融合态势可视化设计及关键技术研究

战场态势可视化通过对作战对象的几何特征和拓扑关系的展现,使得复杂战场信息数据易于理解,以直观的方式展示大量战场信息分析的结果。本文阐述了基于WebGL的二三维融合态势可视化系统架构,提出了多源数据的统一管理、二三维军标一体化表达、基于WebGL的显示引擎技术,实现了多种态势信息综合显示和战场态势空间分析功能。通过大量真实空间数据的测试,本文提出的方法表现了良好的渲染效果。     

高分辨率城市级实景三维地理场景高效构建技术与应用

本文提出了以高速固定翼飞机为飞行平台搭载多镜头倾斜航摄仪获取0.03m分辨率多视影像,采用全自动建模技术制作倾斜摄影三维模型的技术方案,对像点位移、影像存储速度、安全飞行高度等制约高分辨率影像快速获取的因素进行分析,提出解决方法,并通过智慧城市时空大数据平台倾斜摄影省级试点项目对技术方案进行了验证,为高分辨率城市级实景三维地理场景制作提供借鉴。     

无人机倾斜摄影技术在1∶500地形图中的应用

无人机倾斜摄影技术作为测绘领域的热点新技术,利用多镜头倾斜相机搭载无人飞行平台,能够快速获取数据建立实景三维模型,从而真正将外业实景与计算机技术相融合,利用最新的裸眼三维测图技术进行内业测量,可生产出满足精度的1∶500地形图。通过以湖北某区域1∶500项目为例进行分析论证,测绘成果满足要求,从而有效解决了传统RTK、全站仪进行城区1∶500测图效率低、人员投入多、周期长、精度不均匀等问题。     

基于OpenGL的大规模三维地形场景的实时显示技术

虚拟现实技术已经广泛应用于三维仿真、GIS、军事模拟等方面,然而大规模三维地形场景的快速绘制和实时显示却始终是个瓶颈问题.本文论述了运用OpenGL生成三维地形场景的关键技术,并深入探讨了基于矩形格网的视相关LOD模型的ROAM算法实现.     

基于OpenGL的三维地形实时动态交互显示

地形是自然界的复杂形体,地形三维显示技术是地理信息系统(GIS)的重要研究领域及其组成部分。同时,地形的三维实时显示也是虚拟现实(VR)的一项关键技术,而虚拟地形环境面临的是巨量地形数据和地面特征数据。利用这些地理空间数据建立一个逼真、实时、可交互的地形环境是一项复杂的工作。本文介绍了OpenGL的特点及OpenGL图形绘制的基本技术在OpenGL环境下,三维地形实时绘制显示的机制及一般过程。探讨了OpenGL立体图形动态显示的两种主要方式,即:视点固定目标移动和目标固定视点移动。同时给出了具体的绘制实例。     

Thermohaline structure inhomogeneity associated with polynia at the northern margin of Emery Ice-shelf

Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area.     

Phylogenetic analysis of cultivable bacteria isolated from Arctic sea-ice

Phylogenetic analysis based on 16S rDNA of 8 strains of cultivable bacteria isolated from Arctic sea-ice was studied.The results showed that strain BJ1 belonged to genus Planococcus,which was a genus of low mole percent G C gram-positive bacteria;strain BJ6 belonged to genus Burkholderia of β-proteobacteria and the rest 6 strain all belonged to γ-proteobacteria,of which strain BJ8 was a species of Pseudoalteromonas,strain BJ2-BJ5 and BJ7 were members of genus Psychrobacter.Phylogenetic analysis also indicated that bacteria of genus Psychrobacter of the isolates formed a relatively independent phylogenetic cluster in comparison with other bacteria belonged to genus Psychrobacter.     

Information for authors

正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprchensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose is to publish achievements in fundamental research,applied     

Advances in Polar Science CONTENTS(Volume 25,2014)

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Guide to Authors： Journal of Mountain Science

<正>AIMS AND SCOPE(Editorial Policy)The Journal of Mountain Science(JMS)is devoted to mountains and their surrounding lowlands-ecoregions of particular global importance,with a particular emphasis on the important highlands/mountains in the world,such as the Tibetan Plateau,the Himalayas,the Alps,the Andes,the Rockies and many other mountain ranges of our planet.     

Journal of Mountain Science(JMS)

<正>The Journal of Mountain Science(JMS),founded in2004,is an international English-language journal on mountain sciences.JMS is supervised by the Chinese Academy of Sciences(CAS),sponsored by the Chengdu Institute of Mountain Hazards and Environment,CAS,published by Science Press China,and distributed by Springer exclusively throughout the world(excluding Mainland China).The JMS is published bimonthly,fulltexted in SpringerLink and CNKI,indexed/abstracted by     

Relationship of Arctic sea ice and Northern Hemispheric 500 hPa Polar vortices

Using the NCEP/NCAR reanalysis monthly 500 hPa height data on a 2.5 latitude-longitude grid and 1°×1° sea ice data,the polar vortex area,intensity index and arctic sea ice area index are calculated respectively,and the meridional distribution,period variation and the abrupts in the long range trend are analyzed to study their relationship.The results show that the meridional distribution of sea ice and polar vortex h-ave distinctive difference,the relative positions of them are different in the eastern and western hemispheres,and exept they have periods of 4 months,quasi half year,quasi year,4-5 years and 10 years commonly,and each of them has its own respective variation as well.The sea ice area is decreasing apparently since 1980's,so is the polar vortex area,but their abrupt changge time are different totally.The area of sea ice and polar vortex has prominent positive correlation,but the relationship of sea ice intensity,polar vortex intensity,polar vortex area is complicated.     

Preliminary study on plasma membrane fluidity of Psychrophilic Yeast Rhodotorula sp.NJ298 in low temperature

The ability of cell to modulate the fluidity of plasma membrane was crucial to the survival of microorganism at low temperature. Plasma membrane proteins, fatty acids and carotenoids profiles of Antarctic psychrophilc yeast Rhodotorula sp. NJ298 were investigated at -3 ℃, 0 ℃ and 8 ℃. The results showed that plasma membrane protein content was greater at -3 ℃ than that at 8 ℃, and a unique membrane polypeptide composition with an apparent molecular mass of 94.7 kDa was newly synthesized with SDS-PAGE analysis; GC analysis showed that the main changes of fatty acids were the percentage of unsaturated fatty acids (C18∶ 1 and C18∶ 2) and shorter chain saturated fatty acid (C10∶ 0) increased along with the decrease of the culture temperature from 8 ℃ to -3 ℃; HPLC analysis indicated that astaxanthin was the major functional carotenoids of the plasma membrane, percentage of which increased from 54.6±1.5% at 8 ℃ to 81.9±2.1% at -3 ℃. However the fluidity of plasma membrane which was determined by measuring fluorescence anisotropy was similar at -3 ℃, 0 ℃ and 8 ℃. Hence these changes in plasma membrane's characteristics were involved in the cellular cold-adaptation by which NJ298 could maintain normal plasma membrane fluidity at near-freezing temperature.     

Author Index for Journal of Mountain Science Volume 11,2014,pp 1-1656

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