超图平台软件创新:SuperMap GIS 二三维一体化GIS技术体系简介

正北京超图软件股份有限公司有机整合了二维GIS强大的分析功能和基于虚拟现实技术的三维GIS的绚丽可视化效果,自主研发了二三维一体化技术体系,保证二维与三维GIS技术的无缝融合。Super Map GIS从内核层面打造的二三维一体化技术体系,突破了单纯三维软件的应用瓶颈,提供了三维空间数据管理与查询、三维符号体系、二三维空间分析等实用GIS功能。主要包括:二维与三维数据模型、数据存储方案、数据管理、符号、可视化和分析功能的一体化;海量二维数据直接在三维场景中的高性能可视化及三维     

面向数字化城市设计的三维GIS关键技术

城市设计是三维GIS应用的一个重要方向。随着BIM、CIM等概念的提出,三维GIS的发展赋予了城市设计新的含义,“以城市的形体环境为研究对象,通过对城市环境三维的空间设计,来贯彻城市规划思想,指导城市环境元素的进一步设计。”面向城市设计的三维GIS包含许多新的技术,包括能够表达城市现实和抽象空间的三维实体数据模型,面向不同尺度的多源三维数据融合,真三维空间分析与计算,以及三维交互与输出新技术。在三维GIS关键技术的基础上,建立了城市设计规则库。总结了面向数字化城市设计的三维GIS最新技术成果,以期推动城市设计的发展。     

三维GIS渲染引擎的关键技术

随着计算机图形技术的不断发展和人们对视觉要求的不断提高,三维GIS场景的复杂度也在增大。本文在分析三维GIS场景特点的基础上,提出了三维GIS渲染引擎的概念,并分析了渲染引擎在降低三维GIS开发复杂度和提高软件可重用性中的作用。重点探讨了3DGIS中,针对大数据量复杂实时场景进行快速、高效渲染的关键技术,如场景图、层次细节、视锥体剔除、遮挡面剔除、渲染通道等,并对技术原理进行了详细的分析,最后,通过具体的实验验证了这些技术的可用性和有效性。     

基于Skyline的三维地理信息系统应用的实践

随着计算机技术和三维数据获取技术、海量数据动态可视化技术的迅速发展,三维GIS逐步从视觉表现的应用范畴走向专题应用.由于三维GIS具有多维信息处理、表达和分析的特点,在政府决策辅助、国土资源分析、城市应急反应、虚拟旅游、智能交通、城市规划与设计、电子商务、地下管线等方面有着十分广阔的领域,特别是在空间信息的社会化服务中,基于三维GIS的应用都有着越来越明显的优越性和不可替代性.本文就基于Skyline的三维地理信息系统建设中的技术路线、系统功能、数据库设计,数据获取、管理、可视化及分析技术方面进行一些初步实践.     

地理信息系统的分类

地理信息系统按其范围大小可以分为全球的、区域的和局部的三种。通常GIS主要研究地球表层的若干个要素的空间分布,属于2～2.5维GIS,布满整个三维空间建立的GIS,才是真三维GIS。一般也常常将数字位置模型(2维)     

基于ArcGIS Engine的三维数字校园的设计与实现

以兰州交通大学校园为例,基于ArcGIS Engine设计实现了三维数字校园系统,该系统不仅实现了二维GIS常见的功能(如对地图放大、缩小、分析、查询等功能)。而且也实现了三维GIS的相关功能(如:导航,查询、视频输出、场景输出等功能)。系统通过鹰眼窗口控制三维场景和二维场景,实现了二三维场景互动,更加逼真地展现了兰州交通大学校园三维场景,弥补了传统二维GIS和三维GIS的不足。     

三维GIS及其在智慧城市中的应用

三维GIS是当今乃至未来GIS技术的主要标志性内容之一,它突破了空间信息在二维地图平面中单调表现的束缚,为各行各业以及人们的日常生活提供了更有效的辅助决策支持。本文重点介绍了三维GIS的数据模型、数据库管理和可视化分析等关键技术及其研究进展,并以武汉市为例展示了三维GIS对城市立体空间的整体表达,为大城市、全市域的三维数字城市建设奠定了基础,最后探讨了在智慧城市建设与城市安全中三维GIS将发挥日益重要的时空信息承载引擎与空间智能技术支撑作用。     

基于XML三层B/S结构的WebGIS构建

网络地理信息系统(WebGIS)的出现,拓展了原有GIS的应用领域和功能,Internet作为WebGIS地理信息发布的平台,使GIS逐渐面向公众。近年来,有关地理信息系统异构数据库的互操作要求逐渐增多,因此引起人们的关注。XML良好的开放性和能够描述数据的功能为异构数据的互操作提供了有效的转换标准,B/S三层结构的建立能够为网络异质信息的传输提供有效的解决方案,因此,将二者结合应用于WebGIS具有良好的发展前景。本文首先简要介绍了WebGIS的独特优势以及XML和B/S三层结构的主要特点,然后对基于XML三层B/S结构的WebGIS构建在理论上进行了初步探讨。     

网络GIS及其内容体系和应用分析

众多研究人员在网络GIS的研究方面都习惯将其内容简单化为WebGIS或者Internet/Intranet GIS。实际上,WebGIS和Internet/Intranet GIS在数据模型、网络架构、体系构建和功能部署等方面都有较大的区别,这种将We-bGIS和Internet/Intranet GIS统称为网络GIS的做法本身就有缺陷。本文以网络和分布式计算技术为基础,从“广义”和“狭义”的角度对网络GIS的概念框架、内容体系和应用等几个方面做了重构研究,以期推动网络GIS的研究进展。     

基于MapGuide的校园信息系统开发研究

互联网信息技术与地理信息技术相结合的WebGIS技术已成为GIS发展的主流趋势之一,该文阐述了该主流技术的特点和相关技术,又以MapGuide软件作为主要支持技术,以SQL Sever 2000作为数据库管理工具,以校园信息数据为例,设计并实现了校园信息系统。实现了地图浏览、地图查询、要素编辑、三维实景浏览、数据信息的编辑等功能,为用户浏览校园信息提供了方便快捷的方式,亦可以在网页中浏览、方便管理地图信息。     

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.     

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 comprehensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose     

JOURNAL OF OCEAN UNIVERSITY OF CHINA

<正>Copyright Submfnion of a roanusatpt inks:that the work described has not been published before(exoept In the form of an abstrW or as part of a published lecture,review,or thesis);that it is not under consideration for publication elsewhere that its publication has been approved by ail     

Information for Authors

<正>The Journal of Ocean University of China(Oceanic and Coastal Sea Research)is a comprehensive academic quarterly sponsored by the Ocean University of China,published one volume per year.This journal is devoted to the publication of the theoretical and applied research results on oceanography and marine fisheries.The fieldcovered include the physical,chemical,biological,geo-     

Hydraulics and Hydrology in Mountain Areas

<正>The 35th IAHR World Congress was held in Chengdu,China from September 8 to September 132013.The title of the conference was:"The Wise Finds Pleasure in Water:Meandering through Water Science and Engineering".During the congress,1239 papers were presented in 139sessions for oral presentations and 7 sessions for poster presentations.After the Congress,a Committee was appointed to select some of the best papers presented at the Congress for publication,after a     

Sea ice thickness measurement in spring season in Bothnian Bay using an electromagnetic induction instrument

As an important component of the cryosphere,sea ice is very sensitive to the climate change.The study of the sea ice physics needs accurate sea ice thickness.This paper presents an electromagnetic-induction(EM) technique which can be used to measure the sea ice thickness distribution efficiently,and the successful application in Bothnian Bay.Based on the electromagnetic field theory and the electrical properties of sea ice and seawater,EM technique can detect the distance between the instrument and the ice/water interface accurately,than the sea ice thickness is obtained.Contrastive analysis of the apparent conductivity data obtained by EM and the value of drill-hole at same positions allows a construction of a transformable formula of the apparent conductivity to sea ice thickness.The verification of the sea ice thickness calculated by this formula indicates that EM technique is able to get reliable sea ice thickness with average relative error of only 12%.The statistic of all ice thickness profiles shows that the level ice distribution in Bothnian Bay was 0.4-0.6 m.     

Foreword

正Rapid changes of Arctic sea ice cover have been in the focus of the international climate research community in recent years.Quite a few of nations have completed a large number of related surveys and research projects in the Arctic Ocean.Up to now,China has performed six research cruises to the Arctic Ocean resulting in a significant volume of research output.Improved knowledge on the atmospheree-sea ice-ocean interactions in the Arctic is a     

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.