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地理格网互操作增强了地理格网信息资源的融合能力,促进了地理格网信息资源的充分合理利用。然而,地理格网互操作解决方案复杂,通用Web协议没有针对具体地理格网互操作的定义,需研究通用Web协议与地理格网互操作的藕合。OGC WCPS是比较好的地理格网互操作语言规范。本研究在剖析WCPS语言主要特点基础上,归纳了标准的地理格网及其互操作的函数模型,分析了地理格网互操作Web实现的相关协议与标准规范,创造性地提出WCPS与Web传输协议的地理格网互操作耦合模型,针对地理格网分析的Web实现展开快速原型研究,结果表明,WCPS与Web应用协议的耦合可有效提高地理格网分析的互操作性,增强GIS基础设施的服务功能,为WCS Processing扩展标准的制定与更新提供了科学判据,从而为国家区域数字化建设提供支持。 相似文献
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地理信息共享与互操作技术及标准 总被引:6,自引:2,他引:4
地理信息共享和互操作一直是地理信息系统技术要解决的关键问题之一,目前已经发展了多种技术和标准实现地理信息共享技术与互操作,其中基于网络服务方式的地理信息共享和互操作方法是目前公认的最好方法。本文分析总结数据格式转换、直接访问、基于网络服务标准的3种地理信息共享和互操作方式及其优缺点以后,详细阐述了基于网络服务技术实现地理信息共享和互操作需要遵循的地理信息标准,在此基础上分析讨论了地理信息网络共享和互操作的实现技术和基本步骤。 相似文献
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空间互操作框架集成模式分析 总被引:3,自引:1,他引:2
空间互操作已经成为地理信息共享领域研究的重要内容,广义的空间互操作也逐渐成为空间共享技术的代名词。虽着空间互操作研究的深入,空间互操作的模式与方法也逐步多样化起来。本文分别对基于语义空间数据互操作模式,开放式地理数据互操作规范与分布式异构数据库互操作框架,主流GIS平台互操作产品以及ISO/TC211的空间互操作服务体系结构进行分析的基础上,提出了改善各种互操作技术,以提升互操作性能的方法,指出了空间互操作技术框架的发展规律与趋势。从数据转换到开放文件格式,从标准交换格式到应用程序接口,从空间数据库到Web服务的集成,随着时间和互操作技术的发展,互操作的性能也在逐步提升。 相似文献
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三种地理几何数据模型的应用分析 总被引:2,自引:2,他引:0
地理几何数据是GIS软件的基础与核心。介绍了OGIS、Oracle Spatial和ArcGIS的地理几何数据模型,通过对比分析了3种数据模型的优缺点。OGIS的地理几何数据模型结构简单、清晰,易于理解,有一定可扩展性,但模型对部分聚合关系描述得不够抽象,影响了模型的稳定性,而且模型对Polygon和MuhiPolygon的表达能力十分有限: Oracle Spatial的地理几何数据模型层次简单,有较强的可扩展能力和很强的表达能力,但它更象是数学几何的数据模型,而非地理几何的数据模型;ArcGIS地理几何数据模型的表达能力最强、最为完善,但模型的结构比较凌乱, 而且与OGIS的模型标准相差较远。最后,笔者呼吁业界应当积极参与到OGC互操作规范的制定和完善中.以早日实现OGC的互操作计划。 相似文献
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地理信息标准化的最新进展 总被引:5,自引:0,他引:5
杜道生 《地球信息科学学报》2003,5(2):74-78
实现数据共享的关键问题主要有数据结构、数据模型和数据格式的统一;地理信息的标准化;空间数据质量;数据的互操作;网络建设;政策和法规。这些问题的解决,才能营造一个地理信息共享环境。其中地理信息标准化是地理数据共享的关键问题之一。本文主要介绍国内外地理信息标准研究的最新进展,并提出我国在研究和制定地理信息标准时应采取的对策。 相似文献
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网格技术不仅可以解决由于WebGIS缺少"集成"和"互操作"所造成异构GIS应用之间的数据共享与互操作问题;而且可以结合高性能计算手段解决GIS扩展应用中的高密集的计算问题。Grid GIS不仅能为应用提供丰富的各类GIS资源,而且为解决分布异构环境下的GIS共享以及互操作提供了可行的解决方案。然而如何利用Grid技术为那些异构GIS应用提供高性能计算服务,成为一个值得探索的问题。为此,本文初步探讨了基于Grid的高性能GIS的体系结构、整体布局等关键技术,同时对如何构建高性能的GIS服务节点提出了相应的解决办法。 相似文献
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GIS平台开发、应用系统建设与管理,GIS工程服务是构成地理信息产业的三个部分。本文首先阐述了GIS工程服务中心在地理信息产业中的作用与地位。较为详细地介绍了GIS工程服务中心的组织结构,生产运行模式及可能出现的问题。最后,就GIS工程服务中心组织与实践中某些问题进行了初步探讨。 相似文献
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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. 相似文献
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《极地研究(英文版)》2014,(4)
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 相似文献
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《中国海洋大学学报(英文版)》2014,(4)
<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 相似文献
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《中国海洋大学学报(英文版)》2014,(6)
<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- 相似文献
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Massimo GRECO 《山地科学学报》2014,(6):1383-1384
<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 相似文献
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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. 相似文献
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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. 相似文献
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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. 相似文献
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《极地研究(英文版)》2014,(3)
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 相似文献